MAX9867 Ultra-Low Power Stereo Audio Codec General Description Features

19-4573; Rev 2; 6/10
Ultra-Low Power Stereo Audio Codec
Features
o 1.8V Single-Supply Operation
The MAX9867 is an ultra-low power stereo audio codec
designed for portable consumer devices such as
mobile phones and portable gaming consoles.
The device features stereo differential microphone inputs
that can be connected to either analog or digital microphones. The single-ended line inputs, with configurable
preamplifier, can be sent to the ADC for record or routed
directly to the headphone amplifier for playback. An auxiliary ADC path can be used to track any DC voltage.
The stereo headphone amplifiers support differential,
single-ended, and capacitorless output configurations.
Using the capacitorless output configuration, the
device can output 10mW into 32Ω headphones.
Comprehensive click-and-pop circuitry suppresses
audible clicks and pops during volume changes and
startup or shutdown.
Utilizing Maxim’s proprietary digital circuitry, the device
can accept any available 10MHz to 60MHz system
clock. This architecture eliminates the need for an
external PLL and multiple crystal oscillators. The stereo
ADC and DAC paths provide user-configurable voiceband or audioband digital filters. Voiceband filters provide extra attenuation at the GSM packet frequency
and greater than 70dB stopband attenuation at fS/2.
The MAX9867 operates from a single 1.8V supply, and
supports a 1.65V to 3.6V logic level. An I2C 2-wire serial interface provides control for volume levels, signal
mixing, and general operating modes.
The MAX9867 is available in a tiny 2.2mm x 2.7mm,
0.4mm-ball-pitch, WLP package. A 32-pin 5mm x 5mm
TQFN package is also available.
o 6.7mW Playback Power Consumption
o 90dB Stereo DAC, 8kHz ≤ fS ≤ 48kHz
o 85dB Stereo ADC, 8kHz ≤ fS ≤ 48kHz
o Battery-Measurement Auxiliary ADC
o Support for Any Master Clock Between 10MHz to
60MHz
o Stereo Digital Microphone Input Support
o Stereo Analog Differential Microphone Inputs
o Stereo Headphone Amplifiers: Differential,
Single-Ended, or Capacitorless
o Stereo Line Inputs
o Voiceband Filter with a Stopband Attenuation
Greater than 70dB
o 1.65V to 3.6V Digital Interface Supply Voltage
o I2S/TDM-Compatible Digital Audio Bus
o 30-Bump, 2.2mm x 2.7mm 0.4mm-Pitch WLP
Applications
Cell Phones
Portable Gaming Devices
Portable Navigation Devices
Portable Multimedia Players
Wireless Headsets
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9867EWV+
-40°C to +85°C
30 WLP
MAX9867ETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Block Diagram
LEFT MIC AMP
DIGITAL MICROPHONE
INTERFACE
I2S/PCM
I2C
DIGITAL AUDIO INTERFACE
CONTROL
INTERFACE
MAX9867
MIX
DAC
ADC
HEADPHONE
AMP
AUDIO DIGITAL
FILTERS
ADC
RIGHT MIC AMP
DAC
MIX
LEFT PREAMP
LINEIN 1
RIGHT PREAMP
LINEIN 2
HEADPHONE
AMP
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX9867
General Description
MAX9867
Ultra-Low Power Stereo Audio Codec
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to AGND.)
DVDD, AVDD, and PVDD .........................................-0.3V to +2V
DVDDIO.................................................................-0.3V to +3.6V
DGND and PGND..................................................-0.1V to +0.1V
PREG, REF, REG, MICBIAS ....................-0.3V to (AVDD + 0.3V)
MCLK, LRCLK, BCLK
SDOUT, SDIN .................................-0.3V to (DVDDIO + 0.3V)
SDA, SCL, IRQ ......................................................-0.3V to +3.6V
LOUTP, LOUTN, ROUTP,
ROUTN .................................(PGND - 0.3V) to (PVDD + 0.3V)
LINL, LINR, JACKSNS/AUX, MICLP/DIGMICDATA,
MICLN/DIGMICCLK, MICRP, MICRN..-0.3V to (AVDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
30-Bump WLP (derate 12.5mW/°C above +70°C) ....1000mW
32-Pin TQFN-EP (derate 34.5mW/°C above +70°C) .2759mW
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
30-Bump WLP .............................................................80°C/W
32-Pin TQFN-EP ..........................................................29°C/W
Operating Temp Range .......................................-40°C to +85°C
Storage Temp Range ........................................-65°C to +150°C
Lead Temperature (TQFN only, 10s) ...............................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Supply Voltage Range
MIN
TYP
MAX
PVDD, DVDD, AVDD
CONDITIONS
1.65
1.8
1.95
DVDDIO
1.65
1.8
3.6
Analog (AVDD +
PVDD)
4.65
7
Digital (DVDD +
DVDDIO)
0.96
1.5
Analog (AVDD +
PVDD)
3.28
5
Digital (DVDD +
DVDDIO)
1.40
2
Analog (AVDD +
PVDD)
8.0
12
Digital (DVDD +
DVDDIO)
2.0
3
Analog (AVDD +
PVDD)
3.8
6
Digital (DVDD +
DVDDIO)
0.004
0.05
Analog (AVDD +
PVDD)
1
5
Digital (DVDD +
DVDDIO)
1
5
Full-duplex 8kHz
mono (voice mode)
(Note 3)
DAC playback 48kHz
stereo (audio mode)
(Note 3)
Total Supply Current
IVDD
Full-duplex 48kHz
stereo (audio mode)
(Note 3)
UNITS
V
mA
Stereo line-in only
Shutdown Supply Current
2
TA = +25°C
µA
_______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Shutdown to Full Operation
CONDITIONS
MIN
Excludes PLL lock time
Soft-Start/-Stop Time
TYP
MAX
UNITS
10
ms
10
ms
DAC (Note 4)
Dynamic Range (Note 5)
DR
fS = 48kHz, AVVOL =
0dB, TA = +25°C
Master or slave
mode
Slave mode
90
84
Differential mode
Full-Scale Output
VOLL/VOLR = 0x09
Gain Error
DC accuracy, measured with respect to
full-scale output
Voice Path Phase Delay
Total Harmonic Distortion
PDLY
THD
f = 1kHz, 0dBFS, HP
filter disabled, digital
input to analog output
dB
1
Capacitorless and
single-ended modes
VRMS
0.56
1
fS = 8kHz
1.2
fS = 16kHz
0.59
5
%
ms
MCLK = 12.288MHz, fS = 48kHz, 0dBFS,
measured at headphone outputs
-80
dB
DAC Attenuation Range
AVDAC
DACA = 0xF to 0x0
-15
0
dB
DAC Gain Adjust
AVGAIN
DACG = 00 to 11
0
+18
dB
VAVDD = VPVDD = 1.65V to 1.95V
60
Power-Supply Rejection Ratio
PSRR
78
f = 217Hz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
78
f = 1kHz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
75
f = 10kHz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
62
dB
DAC VOICE MODE DIGITAL IIR LOWPASS FILTER
Passband Cutoff
With respect to fS within ripple; fS = 8kHz to
48kHz
0.448 x
fS
-3dB cutoff
0.451 x
fS
fPLP
Passband Ripple
f < fPLP
Stopband Cutoff
fSLP
Stopband Attenuation
With respect to fS; fS = 8kHz to 48kHz
f > fSLP, f = 20Hz to 20kHz
75
Hz
±0.1
dB
0.476 x
fS
Hz
dB
_______________________________________________________________________________________
3
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DAC VOICE MODE DIGITAL 5th ORDER IIR HIGHPASS FILTER
5th Order Passband Cutoff
(-3dB from Peak, I2C Register
Programmable)
5th Order Stopband Cutoff
(-30dB from Peak, I2C Register
Programmable)
DC Attenuation
fDHPPB
fDHPSB
DCATTEN
DVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
0.0161
x fS
DVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
0.0312
x fS
DVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
0.0321
x fS
DVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
0.0625
x fS
DVFLT = 0x5
(fS/240 Butterworth)
0.0042
x fS
DVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
0.0139
x fS
DVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
0.0156
x fS
DVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
0.0279
x fS
DVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
0.0312
x fS
DVFLT = 0x5
(fS/240 Butterworth)
0.0021
x fS
DVFLT ≠ 000
90
Hz
Hz
dB
DAC STEREO AUDIO MODE DIGITAL FIR LOWPASS FILTER
Passband Cutoff
fPLP
Passband Ripple
Stopband Cutoff
Stopband Attenuation
4
With respect to fS within ripple;
fS = 8kHz to 48kHz
0.43 x
fS
-3dB cutoff
0.47 x
fS
-6.02dB cutoff
0.50 x
fS
f < fPLP
fSLP
With respect to fS; fS = 8kHz to 48kHz
Hz
±0.1
dB
0.58 x
fS
Hz
60
_______________________________________________________________________________________
dB
Ultra-Low Power Stereo Audio Codec
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DAC STEREO AUDIO MODE DIGITAL DC BLOCKING HIGHPASS FILTER
Passband Cutoff
(-3dB from Peak)
DC Attenuation
fDHPPB
DVFLT = 0x1
0.000625
x fS
Hz
DCATTEN
DVFLT = 0x1
90
dB
ADC (Note 6)
Dynamic Range (Note 5)
DR
fS = 8kHz, MODE = 0 (IIR voice)
75
84
fS = 8kHz to 48kHz, MODE = 1 (FIR audio)
85
Full-Scale Input
Differential MIC input or stereo-line inputs,
AVPRE = 0dB, AVPGAM = 0dB
1
Gain Error (Note 7)
DC accuracy, measured with respect to
80% of full-scale output
1
Voice Path Phase Delay
f = 1kHz, 0dBFS, HP
filter disabled,
analog input to
digital output
PDLY
Total Harmonic Distortion
THD
ADC Level Adjust Range
AVADC
Power-Supply Rejection Ratio
PSRR
fS = 8kHz
1.2
fS = 16kHz
0.61
dB
VP-P
5
%
ms
f = 1kHz, fS = 8kHz, TA = +25°C, 0dBFS
-81
AVL/AVR = 0xF to 0x0
-12
VAVDD = 1.65V to 1.95V, input referred
60
-70
dB
+3
dB
85
f = 217Hz, VRIPPLE = 100mV, AVADC = 0dB,
input referred
85
f = 1kHz, VRIPPLE = 100mV, AVADC = 0dB,
input referred
80
f = 10kHz, VRIPPLE = 100mV, AVADC = 0dB,
input referred
80
dB
ADC VOICE MODE DIGITAL IIR LOWPASS FILTER
Passband Cutoff
fPLP
Passband Ripple
With respect to fS within ripple;
fS = 8kHz to 48kHz
0.445 x
fS
-3dB cutoff
0.449 x
fS
f < fPLP
Stopband Cutoff
fSLP
Stopband Attenuation
With respect to fS; fS = 8kHz to 48kHz
f > fSLP, f = 20Hz to 20kHz
74
Hz
±0.1
dB
0.469 x
fS
Hz
dB
_______________________________________________________________________________________
5
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ADC VOICE MODE DIGITAL 5th ORDER IIR HIGHPASS FILTER
5th Order Passband Cutoff
(-3dB from Peak, I2C Register
Programmable)
Stopband Cutoff (-30dB from
Peak)
DC Attenuation
fAHPPB
fAHPSB
DCATTEN
AVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
0.0161
x fS
AVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
0.0312
x fS
AVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
0.0321
x fS
AVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
0.0625
x fS
AVFLT = 0x5
(fS/240 Butterworth)
0.0042
x fS
AVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
0.0139
x fS
AVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
0.0156
x fS
AVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
0.0279
x fS
AVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
0.0312
x fS
AVFLT = 0x5
(fS/240 Butterworth)
0.0021
x fS
AVFLT ≠ 000
90
Hz
Hz
dB
ADC STEREO AUDIO MODE DIGITAL FIR LOWPASS FILTER
Passband Cutoff
fPLP
Passband Ripple
Stopband Cutoff
Stopband Attenuation
6
With respect to fS within ripple;
fS = 8kHz to 48kHz
0.43 x
fS
-3dB cutoff
0.48 x
fS
-6.02dB cutoff
0.5 x fS
f < fPLP
fSLP
With respect to fS; fS = 8kHz to 48kHz
f > fSLP, f = 20Hz to 20kHz
Hz
±0.1
dB
0.58 x
fS
Hz
60
_______________________________________________________________________________________
dB
Ultra-Low Power Stereo Audio Codec
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ADC STEREO AUDIO MODE DIGITAL DC BLOCKING HIGHPASS FILTER
Passband Cutoff
(-3dB from Peak)
DC Attenuation
fAHPPB
AVFLT = 0x1
0.000625
x fS
Hz
DCATTEN
AVFLT = 0x1
90
dB
OUTPUT VOLUME CONTROL
Line Input to Output Volume
Control
AVVOL
Output Volume Control Step Size
Output Volume Control Mute
Attenuation
VOLL/VOLR = 0x00
14.55
14.9
15.15
VOLL/VOLR = 0x01
14.1
14.4
14.6
VOLL/VOLR = 0x02
13.6
13.9
14.1
VOLL/VOLR = 0x04
12.6
12.9
13.1
VOLL/VOLR = 0x08
9.35
9.9
10.35
VOLL/VOLR = 0x10
0.35
0.9
1.35
VOLL/VOLR = 0x20
-50.15
-49.2
-48.15
VOLL/VOLR = 0x00 to 0x06 (+6dB to +3dB)
0.5
VOLL/VOLR = 0x06 to 0x0F (+3dB to -6dB)
1
VOLL/VOLR = 0x0F to 0x17 (-6dB to -22dB)
2
VOLL/VOLR = 0x17 to 0x3F (-22dB to mute)
4
f = 1kHz
dB
dB
100
dB
HEADPHONE AMPLIFIER (Note 8)
RL = 16Ω
Output Power per Channel
(Differential Mode)
POUT
f = 1kHz, THD <
1%, TA = +25°C
RL = 32Ω
Output Power per Channel
(Capacitorless Mode)
POUT
f = 1kHz, THD <
1%, TA = +25°C
RL = 32Ω
30
THD+N
RL = 32Ω, POUT =
25mW, f = 1kHz
RL = 16Ω
19
8
THD+N
RL = 32Ω, POUT =
6.25mW, f = 1kHz
-76
-77
MCLK = 12.288MHz,
fS = 48kHz
-80
Dynamic Range
THD+N
DR
RL = 32Ω, POUT =
6.25mW, f = 1kHz
-74
MCLK = 12.288MHz,
fS = 48kHz
-74
dB
-65
dB
-74
MCLK = 13MHz,
fS = 8kHz
-74
MCLK = 12.288MHz,
fS = 48kHz
-76
AVVOL = +6dB (Notes 5, 7)
-70
-72
MCLK = 13MHz,
fS = 8kHz
RL = 16Ω, POUT = 6.25mW, f = 1kHz
Total Harmonic Distortion + Noise
(SE Mode)
mW
10
MCLK = 13MHz,
fS = 8kHz
RL = 16Ω, POUT = 6.25mW, f = 1kHz
Total Harmonic Distortion + Noise
(Capacitorless Mode)
mW
32
RL = 16Ω, POUT = 25mW, f = 1kHz
Total Harmonic Distortion + Noise
(Differential Mode)
52
76
90
-65
dB
dB
_______________________________________________________________________________________
7
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
VAVDD = VPVDD = 1.65V to 1.95V
Power-Supply Rejection Ratio
(Note 7)
Output Offset Voltage
Crosstalk
PSRR
MIN
TYP
60
78
f = 217Hz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
78
f = 1kHz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
75
f = 10kHz, VRIPPLE = 100mVP-P,
AVVOL = 0dB
62
AVVOL = -84dB
differential mode
(LOUTP–LOUTN,
ROUTP–ROUTN),
TA = +25°C
AVVOL = -84dB
capacitorless
mode
(LOUTP–LOUTN,
ROUTP–LOUTN),
TA = +25°C
MAX
dB
±0.2
mV
VOS
XTALK
UNITS
±0.8
Differential mode, POUT = 5mW, f = 1kHz
87
Capacitorless
mode,
POUT = 5mW,
f = 1kHz
TQFN
55
WLP
60
Capacitive Drive
No sustained
oscillations
Click-and-Pop Level
(Differential, Capacitorless
Modes)
Peak voltage,
A-weighted, 32
samples per
second
Click-and-Pop Level
(SE Mode)
Peak voltage,
A-weighted, 32
samples per
second
RL = 32Ω
500
RL = ∞
100
Into shutdown
-80
Out of shutdown
-69
Into shutdown
-75
Out of shutdown
-75
dB
pF
dBV
dBV
MICROPHONE AMPLIFIER
Preamplifier Gain
MIC PGA Gain
Common-Mode Rejection Ratio
MIC Input Resistance
8
AVPRE
AVPGAM
CMRR
RIN_MIC
PALEN/PAREN = 01
-0.5
0
+0.5
PALEN/PAREN = 10
19.5
20
20.5
PALEN/PAREN = 11
29.5
30
30.5
PGAML/PGAMR = 0x1F
-0.6
-0.1
+0.4
PGAML/PGAMR = 0x00
19.3
19.75
20.3
50
dB
30
50
kΩ
VIN = 100mVP-P, f = 217Hz
All gain settings
_______________________________________________________________________________________
dB
dB
Ultra-Low Power Stereo Audio Codec
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Total Harmonic Distortion + Noise
SYMBOL
THD+N
CONDITIONS
PSRR
TYP
-80
AVPRE = +30dB,
VIN = 32mVP-P, f = 1kHz,
(1VP-P at ADC input)
-67
VAVDD = 1.65V to 1.95V, input referred
Power-Supply Rejection Ratio
MIN
AVPRE = 0dB,
VIN = 1VP-P, f = 1kHz
MAX
UNITS
dB
60
85
f = 217Hz, VRIPPLE = 100mV,
AVADC = 0dB, input referred
85
f = 1kHz, VRIPPLE = 100mV,
AVADC = 0dB, input referred
80
f = 10kHz, VRIPPLE = 100mV,
AVADC = 0dB, input referred
80
dB
MICROPHONE BIAS
Output Voltage
1.525
1.55
V
Load Regulation
VMICBIAS
ILOAD = 1mA to 2mA
0.2
10
V/A
Line Regulation
VAVDD = 1.65V to 1.95V
10
f = 217Hz, VRIPPLE = 100mVP-P
85
f = 10kHz, VRIPPLE = 100mVP-P
81
A-weighted
9.1
Power-Supply Rejection Ratio
PSRR
Noise Voltage
VAVDD = 1.8V, ILOAD = 1mA
1.5
µV/V
dB
µVRMS
LINE INPUT
Full-Scale Input
VIN
Line Input Level Adjust Range
AVLINE
Line Input Mute Attenuation
AVLINE = 0dB
LIGL/LIGR = 0xF to 0x0
1.0
-6.5
f = 1kHz
Input Resistance
RIN_LINE
AVLINE = +24dB
Total Harmonic Distortion + Noise
THD+N
VIN = 0.1VP-P, f = 1kHz, differential output
VP-P
+24.5
100
dB
dB
20
kΩ
-83
dB
AUXIN INPUT
Input DC Voltage Range
AUXIN Input Resistance
RIN
AUXEN = 1
0
AUXEN = 1, 0V ≤ AUXIN ≤ 0.738V
10
0.738
40
V
MΩ
JACK SENSE OPERATION
JDETEN = 1, SHDN = 1, JACKSNS
Threshold
Pullup Current
Pullup Voltage
VTH
IPU
JDETEN = 1, SHDN = 0, JACKSNS,
LOUTP
0.92 x
0.95 x
0.98 x
MICBIAS MICBIAS MICBIAS
AVDD 0.8
AVDD 0.4
JDETEN = 1, SHDN = 1,
JACKSNS = GND
4
JDETEN = 1, SHDN = 0,
JACKSNS = LOUTP = GND
4
JDETEN = 1, JACKSNS, LOUTP
AVDD 0.15
V
µA
AVDD
20
V
_______________________________________________________________________________________
9
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0
dB
DIGITAL SIDETONE
Sidetone Gain Adjust Range
Voice Path Phase Delay
AVSTGA
PDLY
Differential output mode,
DVST = 0x1F to 0x01
-60
MIC input to headphone output, f = 1kHz,
HP filter disabled, fS = 8kHz
2.2
ms
INPUT CLOCK CHARACTERISTICS
MCLK Input Frequency
fMCLK
MCLK Input Duty Cycle
For any LRCLK sample rate
10
Prescaler = /1 mode
40
60
/2 or /4 modes
30
70
Maximum allowable RMS for performance
limits
Maximum MCLK Input Jitter
60
LRCLK Sample Rate Range
100
8
7
Nonrapid lock
mode
12
25
LRCLK Acceptable Jitter for
Maintaining PLL Lock
Allowable LRCLK period change from
nominal for slave PLL mode at any
allowable LRCLK and PCLK rates
LRCLK Average Frequency Error
(Master and Slave Modes)
(Note 9)
48
2
Any allowable LRCLK
and PCLK rate, slave
mode
kHz
ms
±100
ns
%
FREQ = 0x8 through 0xF
0
0
PCLK = 192xfS, 256xfS, 384xfS, 512xfS,
768xfS, and 1024xfS
0
0
-0.025
+0.025
All other modes
%
psRMS
Rapid lock mode
LRCLK PLL Lock Time
MHz
DIGITAL INPUT (MCLK)
Input High Voltage
Input Low Voltage
Input Leakage Current
VIH
1.2
V
VIL
IIH, IIL
TA = +25°C
Input Capacitance
0.6
V
±1
µA
10
pF
DIGITAL INPUTS (SDIN, BCLK, LRCLK)
Input High Voltage
VIH
Input Low Voltage
VIL
0.7 x
DVDDIO
0.3 x
DVDDIO
Input Hysteresis
Input Leakage Current
Input Capacitance
10
V
200
IIH, IIL
TA = +25°C
mV
±1
10
______________________________________________________________________________________
V
µA
pF
Ultra-Low Power Stereo Audio Codec
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DIGITAL INPUTS (SDA, SCL)
Input High Voltage
VIH
Input Low Voltage
VIL
0.7 x
DVDD
V
0.3 x
DVDD
Input Hysteresis
200
Input Leakage Current
IIH, IIL
TA = +25°C
mV
±1
Input Capacitance
V
10
µA
pF
DIGITAL INPUT (DIGMICDATA)
Input High Voltage
VIH
Input Low Voltage
VIL
0.65 x
DVDD
V
0.35 x
DVDD
Input Hysteresis
100
Input Leakage Current
IIH, IIL
TA = +25°C
mV
±35
Input Capacitance
V
10
µA
pF
CMOS DIGITAL OUTPUTS (BCLK, LRCLK, SDOUT)
Output Low Voltage
VOL
IOL = 3mA
Output High Voltage
VOH
IOH = 3mA
0.4
DVDDIO
- 0.4
V
V
CMOS DIGITAL OUTPUT (DIGMICCLK)
Output Low Voltage
VOL
IOL = 1mA
Output High Voltage
VOH
IOH = 1mA
0.4
DVDD 0.4
V
V
OPEN-DRAIN DIGITAL OUTPUTS (SDA, IRQ)
Output High Current
Output Low Voltage
IOH
VOL
VOUT = VDVDD, TA = +25°C
IOL = 3mA
1
µA
0.2 x
DVDD
V
DIGITAL MICROPHONE TIMING CHARACTERISTICS (VDVDD = 1.65V)
MICCLK = 00
PCLK/8
MICCLK = 01
PCLK/6
MHz
DIGMICCLK Divide Ratio
fMICCLK
DIGMICDATA to DIGMICCLK
Setup Time
tSU, MIC
Either clock edge
20
ns
DIGMICDATA to DIGMICCLK
Hold Time
tHD, MIC
Either clock edge
0
ns
DIGITAL AUDIO INTERFACE TIMING CHARACTERISTICS (VDVDD = 1.65V)
Minimum BCLK Cycle Time
tBCLKS
Slave operation
75
ns
tBCLKM
Master operation
325
ns
______________________________________________________________________________________
11
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD = VPVDD = VDVDD = VDVDDIO = +1.8V, RL = ∞, headphone load (RL) connected between _OUTP and _OUTN in differential
mode, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVPRE = +20dB, AVPGAM = 0dB, AVDAC = 0dB, AVLINE = +20dB, AVVOL =
0dB, MCLK = 13MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum BCLK High Time
tBCLKH
Slave operation
30
Minimum BCLK Low Time
BCLK or LRCLK Rise and Fall
tBCLKL
Slave operation
30
ns
Master operation, CL = 15pF
7
ns
tR, tF
ns
SDIN or LRCLK to BCLK Setup
Time
tSU
20
ns
SDIN or LRCLK to BCLK Hold
Time
tHD
0
ns
SDOUT Delay Time from BCLK
Rising Edge
tDLY
CL = 30pF
0
40
ns
400
kHz
I2C TIMING CHARACTERISTICS (VDVDD = 1.65V)
Serial-Clock Frequency
fSCL
0
Bus Free Time Between STOP
and START Conditions
tBUF
1.3
µs
Hold Time (REPEATED) START
Condition
tHD, STA
0.6
µs
SCL Pulse-Width Low
tLOW
1.3
µs
SCL Pulse-Width High
tHIGH
0.6
µs
Setup Time for a REPEATED
START Condition
tSU, STA
0.6
µs
Data Hold Time
tHD, DAT
Data Setup Time
tSU, DAT
RPU, SDA = 475Ω
0
900
100
ns
ns
SDA and SCL Receiving Rise
Time
tR
(Note 10)
20 +
0.1CB
300
ns
SDA and SCL Receiving Fall
Time
tF
(Note 10)
20 +
0.1CB
300
ns
SDA Transmitting Fall Time
tF
RPU, SDA = 475Ω
(Note 10)
20 +
0.1CB
250
ns
Setup Time for STOP Condition
tSU, STO
Bus Capacitance
CB
Pulse Width of Suppressed Spike
tSP
0.6
0
µs
400
pF
50
ns
The MAX9867 is 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
Clocking all zeros into the DAC, master mode, and differential headphone mode.
DAC performance measured at the headphone outputs.
Dynamic range measured using the EIAJ method. -60dBFS 1kHz output signal, A-weighted, and normalized to 0dBFS.
f = 20Hz to 20kHz.
Note 6: Performance measured using microphone inputs, unless otherwise stated.
Note 7: Performance measured using line inputs.
Note 8: Performance measured using DAC, unless otherwise stated. LRCLK = 8kHz, unless otherwise stated.
Note 9: In master-mode operation, the accuracy of the MCLK input proportionally determines the accuracy of the sample clock rate.
Note 10: CB is in pF.
Note 2:
Note 3:
Note 4:
Note 5:
12
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
-20
-20
-50
3kHz
-40
-50
3kHz
-80
5
10
15
20
25
30
35
1kHz
6kHz
-80
20Hz
-90
0
-50
-70
20Hz
-90
-40
-60
1kHz
-70
-80
20Hz
-90
0
10
20
30
40
50
60
0
5
10
15
20
25
30
35
POWER OUT (mW)
POWER OUT (mW)
POWER OUT (mW)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
-20
-20
-30
-50
6kHz
-60
-40
-50
-60
1kHz
-70
-70
-80
-80
20Hz
-90
0
THD+N (%)
-40
20
30
40
50
60
-40
-50
-60
5mW
5mW
-70
-80
20mW
20mW
-90
-90
10
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 16Ω
DIFFERENTIAL MODE
-10
-30
THD+N (%)
-30
MAX9867 toc06
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω
DIFFERENTIAL MODE
-10
0
MAX9867 toc05
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 16Ω
DIFFERENTIAL MODE
-20
0
MAX9867 toc04
0
-10
100
10
1000
100
10
10,000
1000
10,000
POWER OUT (mW)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 16Ω
DIFFERENTIAL MODE
-10
-20
-20
-30
-50
-60
-40
-50
-60
5mW
-70
-70
-80
-80
20mW
-90
10
100
THD+N (dB)
-40
1000
FREQUENCY (Hz)
10,000
-40
-50
3kHz
1kHz
-60
5mW
-70
-80
20mW
20Hz
-90
-90
100,000
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω
CAPACITORLESS MODE
-10
-30
THD+N (%)
-30
0
MAX9867 toc09
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 32Ω
DIFFERENTIAL MODE
-20
0
MAX9867 toc07
0
-10
MAX9867 toc08
THD+N (dB)
-20
-30
-60
1kHz
-70
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 32Ω
DIFFERENTIAL MODE
-10
THD+N (dB)
-40
-60
THD+N (%)
0
-30
THD+N (dB)
-30
THD+N (dB)
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 16Ω
DIFFERENTIAL MODE
-10
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
MAX9867 toc02
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω
DIFFERENTIAL MODE
-10
0
MAX9867 toc01
0
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
MAX9867 toc03
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
10
100
1000
FREQUENCY (Hz)
10,000
100,000
0
2
4
6
8
10
POWER OUT (mW)
______________________________________________________________________________________
13
MAX9867
Typical Operating Characteristics
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
-20
-20
-50
6kHz
1kHz
-60
-30
-40
-50
1mW
-60
-70
2
4
6
8
10
12
1mW
-80
5mW
-90
0
-50
-70
-80
20Hz
-90
-40
-60
-70
-80
5mW
-90
10
100
1000
10,000
100
10
10,000
1000
100,000
POWER OUT (mW)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
-20
-20
-30
20Hz
-50
3kHz
-60
-40
20Hz
-50
6kHz
-60
-70
THD+N (%)
-40
2
4
6
8
10
1mW
-80
1kHz
5mW
-90
-90
0
-50
-70
-80
-90
-40
-60
-70
1kHz
-80
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω, COUT = 220µF
SINGLE-ENDED MODE
POUT SPECIFIED AT 1kHz
-10
-30
THD+N (dB)
-30
MAX9867 toc15
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 32Ω, COUT = 220µF
SINGLE-ENDED MODE
-10
0
MAX9867 toc14
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω, COUT = 220µF
SINGLE-ENDED MODE
-20
0
MAX9867 toc13
0
-10
2
0
4
6
8
10
100
10
12
1000
10,000
POWER OUT (mW)
POWER OUT (mW)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (LINE IN TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (LINE IN TO HEADPHONE)
-10
-50
-30
-40
-50
1mW
-80
6kHz
10
100
1000
FREQUENCY (Hz)
10,000
100,000
-50
-70
20Hz
-80
1kHz
-90
-80
-90
-40
6kHz
1kHz
-70
5mW
-30
-60
20Hz
-60
-70
LINE IN PREAMP = 0dB
RLOAD = 32Ω
DIFFERENTIAL MODE
-20
THD+N (dB)
-40
-60
0
-10
-20
THD+N (dB)
-30
LINE IN PREAMP = +18dB
RLOAD = 32Ω
DIFFERENTIAL MODE
MAX9867 toc18
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω, COUT = 220µF
SINGLE-ENDED MODE
POUT SPECIFIED AT 1kHz
-20
0
MAX9867 toc16
0
-10
MAX9867 toc17
THD+N (dB)
-20
THD+N (%)
-40
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 32Ω
CAPACITORLESS MODE
-10
-30
THD+N (%)
THD+N (dB)
-30
14
MCLK = 13MHz
LRCLK = 8kHz
RLOAD = 32Ω
CAPACITORLESS MODE
-10
0
MAX9867 toc11
MCLK = 12.288MHz
LRCLK = 48kHz
RLOAD = 32Ω
CAPACITORLESS MODE
-10
0
MAX9867 toc10
0
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (DAC TO HEADPHONE)
MAX9867 toc12
TOTAL HARMONIC DISTORTION + NOISE
vs. POWER OUT (DAC TO HEADPHONE)
THD+N (%)
MAX9867
Ultra-Low Power Stereo Audio Codec
0
5
10 15 20 25 30 35 40 45 50
POWER OUT (mW)
0
5
10
15
20
25
POWER OUT (mW)
______________________________________________________________________________________
30
35
40
Ultra-Low Power Stereo Audio Codec
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (LINE IN TO HEADPHONE)
-20
-30
THD+N (dB)
THD+N (dB)
-30
-40
-50
5mW
-40
-50
-60
-60
-70
-70
MCLK = 12.288MHz
LRCLK = 48kHz
THD+N = < 0.1%
DIFFERENTIAL MODE
50
POWER OUT (mW)
-20
LINE IN PREAMP = 0dB
RLOAD = 32Ω
DIFFERENTIAL MODE
-10
POWER OUT vs. HEADPHONE LOAD
60
MAX9867 toc20
LINE IN PREAMP = +18dB
RLOAD = 32Ω
DIFFERENTIAL MODE
-10
0
MAX9867 toc19
0
5mW
MAX9867 toc21
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (LINE IN TO HEADPHONE)
40
30
20
10
-80
20mW
-90
100
10,000
1000
100,000
100
0
10,000
1000
1
100,000
10
100
1000
FREQUENCY (Hz)
HEADPHONE LOAD (Ω)
POWER OUT vs. HEADPHONE LOAD
POWER OUT vs. HEADPHONE LOAD
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MICROPHONE TO ADC)
20
15
10
0
-20
-30
15
10
-40
-50
-60
-70
5
5
MCLK = 13MHz
LRCLK = 8kHz
MICPRE = 0dB
VIN = 1VP-P
-10
THD+N (%)
POWER OUT (mW)
20
MCLK = 12.288MHz
LRCLK = 48kHz
THD+N = < 0.1%
SINGLE-ENDED MODE
MAX9867 toc24
25
MAX9867 toc22
MCLK = 12.288MHz
LRCLK = 48kHz
THD+N = < 0.1%
CAPACITORLESS MODE
25
-80
0
-90
0
1
10
100
1000
1
10
100
100
10
1000
1000
10,000
HEADPHONE LOAD (Ω)
HEADPHONE LOAD (Ω)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MICROPHONE TO ADC)
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MICROPHONE TO ADC)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (DAC TO HEADPHONE)
MCLK = 13MHz
LRCLK = 8kHz
MICPRE = 30dB
VIN = 0.032VP-P
-10
-20
-20
-30
-50
PSRR (dB)
-40
-40
-50
-40
-50
-60
-60
-60
-70
-70
-70
-80
-80
-80
-90
-90
-90
10
100
1000
FREQUENCY (Hz)
10,000
VRIPPLE = 100mVP-P
MCLK = 13MHz
LRCLK = 8kHz
-10
-30
THD+N (%)
-30
0
MAX9867 toc27
MCLK = 13MHz
LRCLK = 8kHz
MICPRE = 20dB
VIN = 0.11VP-P
-20
0
MAX9867 toc25
0
-10
MAX9867 toc26
POWER OUT (mW)
10
FREQUENCY (Hz)
30
THD+N (%)
20mW
-90
10
MAX9867 toc23
-80
10
100
1000
FREQUENCY (Hz)
10,000
10
100
1000
10,000
100,000
FREQUENCY (Hz)
______________________________________________________________________________________
15
MAX9867
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
-20
-50
-60
-40
-50
-60
-70
-70
-80
-80
-90
100
1000
-40
-60
-80
-100
-120
-140
-90
10
10
100
0
1000
2
4
6
8
10 12 14 16
18 20
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (kHz)
FFT, DAC TO HEADPHONE,
-60dBFS, MCLK = 13MHz, LRCLK = 8kHz
FFT, DAC TO HEADPHONE,
0dBFS, MCLK = 12.288MHz, LRCLK = 48kHz
FFT, DAC TO HEADPHONE,
-60dBFS, MCLK = 12.288MHz, LRCLK = 48kHz
0
NI = 6000
0
NI = 6000
0
-20
-40
-60
-80
AMPLITUDE (dB)
-20
AMPLITUDE (dB)
-20
20
-40
-60
-80
-40
-60
-80
-100
-100
-100
-120
-120
-120
-140
-140
-140
0
2
4
6
8
10 12 14 16
18 20
MAX9867 toc33
FREQ = 0xA
MAX9867 toc32
20
MAX9867 toc31
20
0
2
4
6
8
10 12 14 16
0
18 20
2
4
6
8
10 12 14 16
18 20
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
FFT, DAC TO HEADPHONE,
0dBFS, MCLK = 13MHz, LRCLK = 48kHz
FFT, DAC TO HEADPHONE,
-60dBFS, MCLK = 13MHz, LRCLK = 48kHz
FFT, DAC TO HEADPHONE,
0dBFS, MCLK = 13MHz, LRCLK = 44.1kHz
PLL MODE
0
PLL MODE
0
PLL MODE
0
-20
-40
-60
-80
AMPLITUDE (dB)
-20
AMPLITUDE (dB)
-20
20
-40
-60
-80
-40
-60
-80
-100
-100
-100
-120
-120
-120
-140
-140
-140
0
2
4
6
8
10 12 14 16
FREQUENCY (kHz)
18 20
MAX9867 toc36
20
MAX9867 toc34
20
MAX9867 toc35
AMPLITUDE (dB)
AMPLITUDE (dB)
-40
FREQ = 0xA
0
-20
-30
PSRR (dB)
PSRR (dB)
-30
16
VRIPPLE = 100mVP-P
-10
20
MAX9867 toc29
VRIPPLE = 100mVP-P
MCLK = 13MHz
LRCLK = 8kHz
-20
0
MAX9867 toc28
0
-10
FFT, DAC TO HEADPHONE,
0dBFS, MCLK = 13MHz, LRCLK = 8kHz
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (MICBIAS)
MAX9867 toc30
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (MIC TO ADC)
AMPLITUDE (dB)
MAX9867
Ultra-Low Power Stereo Audio Codec
0
2
4
6
8
10 12 14 16
FREQUENCY (kHz)
18 20
0
2
4
6
8
10 12 14 16
FREQUENCY (kHz)
______________________________________________________________________________________
18 20
Ultra-Low Power Stereo Audio Codec
PLL MODE
0
FREQ = 0xA
0
FREQ = 0xA
0
-60
-80
-20
AMPLITUDE (dB)
AMPLITUDE (dB)
-40
-60
-80
-40
-60
-80
-100
-100
-100
-120
-120
-120
-140
0
2
4
6
8
10 12 14 16
18 20
-140
0
500 1000 1500 2000 2500 3000 3500 4000
0
500 1000 1500 2000 2500 3000 3500 4000
FREQUENCY (kHz)
FREQUENCY (Hz)
FREQUENCY (Hz)
FFT, MICROPHONE TO ADC,
0dBFS, MCLK = 12.288MHz, LRCLK = 48kHz
FFT, MICROPHONE TO ADC,
-60dBFS, MCLK = 12.288MHz, LRCLK = 48kHz
FFT, MICROPHONE TO ADC,
0dBFS, MCLK = 13MHz, LRCLK = 48kHz
0
NI = 6000
0
PLL MODE
0
-40
-60
-80
-20
AMPLITUDE (dB)
-20
AMPLITUDE (dB)
-20
20
-40
-60
-80
-40
-60
-80
-100
-100
-100
-120
-120
-120
-140
-140
0
2
4
6
8
10 12 14 16
18 20
MAX9867 toc42
NI = 6000
MAX9867 toc41
20
MAX9867 toc40
20
-140
0
2
4
6
8
10 12 14 16
18 20
0
2
4
6
8
10 12 14 16
18 20
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
FFT, MICROPHONE TO ADC,
-60dBFS, MCLK = 13MHz, LRCLK = 48kHz
WIDEBAND FFT, DAC TO HEADPHONE,
0dBFS, MCLK = 13MHz, LRCLK = 8kHz
WIDEBAND FFT, DAC TO HEADPHONE,
-60dBFS, MCLK = 13MHz, LRCLK = 8kHz
0
FREQ = 0xA
-20
AMPLITUDE (dB)
-20
-40
-60
-80
-60
-80
-140
2
4
6
8
10 12 14 16
FREQUENCY (kHz)
18 20
-60
-80
-120
-140
-140
0
-40
-100
-120
-120
FREQ = 0xA
0
-20
-40
-100
-100
20
AMPLITUDE (dB)
PLL MODE
MAX9867 toc45
0
MAX9867 toc43
20
MAX9867 toc44
AMPLITUDE (dB)
-40
-140
AMPLITUDE (dB)
20
-20
-20
AMPLITUDE (dB)
FFT, MICROPHONE TO ADC,
-60dBFS, MCLK = 13MHz, LRCLK = 8kHz
MAX9867 toc38
20
MAX9867 toc37
20
FFT, MICROPHONE TO ADC,
0dBFS, MCLK = 13MHz, LRCLK = 8kHz
MAX9867 toc39
FFT, DAC TO HEADPHONE, -60dBFS,
MCLK = 13MHz, LRCLK = 44.1kHz
0
20
40
60
80
FREQUENCY (kHz)
100
120
0
20
40
60
80
100
120
FREQUENCY (kHz)
______________________________________________________________________________________
17
MAX9867
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
LRCLK = 8kHz
MODE = 0
0
20
AVFLT = 0
LRCLK = 8kHz
0
DVFLT = 3
20
10
AVFLT = 3
-40
-60
-20
AMPLITUDE (dB)
AMPLITUDE (dB)
-20
-40
-60
AVFLT = 4
-80
-100
-100
-10
-20
MODE = 0
-30
-40
-50
DVFLT = 4
-80
MODE = 1
0
MAX9867 toc48
DVFLT = 0
MAX9867 toc46
20
DAC IIR/FIR LOWPASS FILTER
FREQUENCY RESPONSE (8kHz)
DAC IIR HIGHPASS FILTER
FREQUENCY RESPONSE, MODE = 0
MAX9867 toc47
DAC IIR HIGHPASS FILTER
FREQUENCY RESPONSE, MODE = 0
AMPLITUDE (dB)
-60
-70
220
320
420
520
-80
20
120
FREQUENCY (Hz)
420
520
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0
FREQUENCY (kHz)
SHUTDOWN TO DAC FULL OPERATION
(CAPACITORLESS OR DIFFERENTIAL MODE)
MODE = 1
10
MAX9867 toc49
20
MODE = 0
-40
LOUTP (500mV/div)
AMPLITUDE (dB)
320
FREQUENCY (Hz)
ADC IIR/FIR LOWPASS FILTER
FREQUENCY RESPONSE (8kHz)
-20
220
MAX9867 toc50
120
SCL (2V/div)
20
-60
-80
-100
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0
TIME (4ms/div)
FREQUENCY (kHz)
MAX9867 toc52
SCL (2V/div)
LOUTP (500mV/div)
SCL (2V/div)
TIME (40ms/div)
18
SHUTDOWN TO DAC FULL OPERATION
(FAST TURN-ON SINGLE-ENDED MODE)
MAX9867 toc51
SHUTDOWN TO DAC FULL OPERATION
(CLICKLESS SINGLE-ENDED MODE)
LOUTP (500mV/div)
MAX9867
Ultra-Low Power Stereo Audio Codec
TIME (4ms/div)
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
SCL (2V/div)
LOUTP (500mV/div)
ADC OUT (500mV/div)
SCL (2V/div)
MAX9867 toc54
ADC SOFT-START
MAX9867 toc53
FULL OPERATION TO SHUTDOWN (DAC)
TIME (1ms/div)
TIME (4ms/div)
TOTAL HARMONIC DISTORTION + NOISE
vs. MCLK FREQUENCY, 0dBFS
THD+N (dB)
-30
-40
-50
-60
-70
VIN = -60dBFS
LRCLK = 48kHz
PLL MODE
A-WEIGHTED
110
DYNAMIC RANGE (dB)
-20
-80
MAX9867 toc56
LRCLK = 48kHz
PLL MODE
-10
DYNAMIC RANGE vs. MCLK FREQUENCY
120
MAX9867 toc55
0
100
90
80
70
-90
-100
60
10 15 20 25 30 35 40 45 50 55 60
10
100
MCLK FREQUENCY (MHz)
MCLK FREQUENCY (MHz)
LINE INPUT RESISTANCE vs. GAIN SETTING
INPUT RESISTANCE (kΩ)
170
120
70
MAX9867 toc58
220
AUX CODE vs. INPUT VOLTAGE
30,000
AUX CODE (SIGNED DECIMAL)
MAX9867 toc57
270
25,000
20,000
15,000
10,000
5000
0
20
-5000
-6
-1
4
9
14
GAIN SETTING (dB)
19
24
-0.4 -0.2
0
0.2
0.4
0.6
0.8
1.0
1.2
INPUT VOLTAGE (V)
______________________________________________________________________________________
19
MAX9867
Typical Operating Characteristics (continued)
(VAVDD = VDVDD = VPVDD = +1.8V, CREF = 2.2µF, CMICBIAS = CPREG = CREG = 1µF, AVMICPGA = 0dB, MCLK = 13MHz, LRCLK =
8kHz, BW = 20Hz to fS/2, TA = +25°C, unless otherwise noted.)
Ultra-Low Power Stereo Audio Codec
MAX9867
Pin Description
PIN/BUMP
FUNCTION
WLP
1
A2
DGND
2
B3
SCL
I2C Serial-Clock Input. Connect a pullup resistor to a 1.7V to 3.3V supply.
3
A3
SDA
4
C3
IRQ
5
A4
AVDD
I2C Serial-Data Input/Output. Connect a pullup resistor to a 1.7V to 3.3V supply.
Hardware Interrupt Output. IRQ can be programmed to pull low when bits in
status register 0x00 are set. Read status register 0x00 to clear IRQ once set.
Repeat faults have no effect on IRQ until it is cleared by reading register 0x00.
Connect a 10kΩ pullup resistor to a 1.7V to 3.3V supply.
Analog Power Supply. Bypass to AGND with a 1µF capacitor.
6
B4
REF
Converter Reference. Bypass to AGND with a 2.2µF capacitor (1.23V nominal).
PREG
Positive Internal Regulated Supply. Bypass to AGND with a 1µF capacitor (1.6V
nominal).
Digital Ground
7
A5
8
B5
REG
9
A6
AGND
10
B6
MICBIAS
C5
MICLN/
DIGMICCLK
Left Negative Differential Microphone Input or Digital Microphone Clock Output.
For analog microphones, AC-couple to the negative output of a microphone with a
1µF capacitor. For digital microphones, connect to the clock input of the
microphone.
12
C6
MICLP/
DIGMICDATA
Left Positive Differential Microphone Input or Digital Microphone Data Input. For
analog microphones, AC-couple to the positive output of a microphone with a 1µF
capacitor. For digital microphones, connect to the data output of the
microphone(s). Up to two digital microphones can be connected.
13
C4
MICRP
Right Positive Differential Microphone Input. AC-couple to the positive output of a
microphone with a 1µF capacitor.
14
D6
MICRN
Right Negative Differential Microphone Input. AC-couple to the negative output of
a microphone with a 1µF capacitor.
15
D5
LINL
16
E6
LINR
11
PREG/2 Voltage Reference. Bypass to AGND with a 1µF capacitor (0.8V nominal).
Analog Ground
Low-Noise Microphone Bias. Connect a 2.2kΩ to 470Ω resistor to the positive
output of a microphone (1.525V nominal). Bypass to AGND with a 1µF capacitor.
Left-Line Input. AC-couple analog audio signal to LINL with a 1µF capacitor.
Right-Line Input. AC-couple analog audio signal to LINR with a 1µF capacitor.
Jack Sense or Auxiliary ADC Input. When configured for jack detection, JACKSNS
detects the presence or absence of a jack. See the Mode Configuration section
for details. When configured as an auxiliary ADC input, AUX is used to measure
DC voltages.
Headphone Power Ground
17
D4
JACKSNS/AUX
18
E5
PGND
19
D3
ROUTP
Positive Right-Channel Headphone Output. Connect directly to the load in
differential and capacitorless mode. AC-couple to the load in single-ended mode.
20
E4
ROUTN
Negative Right-Channel Headphone Output. Inverting output in differential mode.
Leave unconnected in capacitorless and fast turn-on single-ended mode. Bypass
with a 1µF capacitor to AGND in clickless, single-ended mode.
LOUTN
Negative Left-Channel Headphone Output. Noninverting output in differential
mode. Common headphone return in capacitorless mode. Leave unconnected in
fast turn-on single-ended mode. Bypass with a 1µF capacitor to AGND in clickless
single-ended mode.
21
20
NAME
TQFN-EP
D2
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
PIN/BUMP
NAME
FUNCTION
E3
LOUTP
Positive Left-Channel Headphone Output. Connect directly to the load in
differential and capacitorless mode. AC-couple to the load in single-ended mode.
23
E2
PVDD
Headphone Power Supply. Bypass to PGND with a 1µF capacitor.
24, 25
—
N.C.
26
E1
DVDDIO
27
D1
SDOUT
28
C2
SDIN
29
C1
LRCLK
30
B1
BCLK
Digital Audio Bit Clock Input/Output. BCLK is an input when the MAX9867 is in
slave mode and an output when in master mode.
31
B2
MCLK
Master Clock Input. Acceptable input frequency range: 10MHz to 60MHz.
32
A1
DVDD
Digital Power Supply. Supply for the digital circuitry and I2C interface. Bypass to
DGND with a 1µF capacitor.
—
—
EP
TQFN-EP
WLP
22
No Connection
Digital Audio Interface Power Supply. Bypass to DGND with a 1µF capacitor.
Digital Audio Serial-Data ADC Output
Digital Audio Serial-Data DAC Input
Digital Audio Left-Right Clock Input/Output. LRCLK is the audio sample rate clock
and determines whether the audio data on SDIN is routed to the left or right
channel. In TDM mode, LRCLK is a frame synchronization pulse. LRCLK is an
input when the MAX9867 is in slave mode and an output when in master mode.
Exposed Pad. Connect the exposed thermal pad to AGND.
Detailed Description
The MAX9867 is a low-power stereo audio codec
designed for portable applications requiring minimum
power consumption.
The stereo playback path accepts digital audio through
a flexible interface compatible with I2S, TDM, and leftjustified signals. An oversampling sigma-delta DAC
converts the incoming digital data stream to analog
audio and outputs the audio through the stereo headphone amplifier. The headphone amplifier can be configured in differential, single-ended, and capacitorless
output modes.
The stereo record path has two analog microphone
inputs with selectable gain. An integrated microphone
bias can be used to power the microphones. The left
analog microphone inputs can also accept data from
up to two digital microphones. An oversampling sigmadelta ADC converts the microphone signals and outputs the digital bit stream over the digital audio
interface.
Integrated digital filtering provides a range of notch and
highpass filters for both the playback and record paths
to limit undesirable low-frequency signals and GSM
transmission noise. The digital filtering provides attenuation
of out-of-band energy by over 70dB, eliminating audible aliasing. A digital sidetone function allows audio
from the record path to be summed into the playback
path after digital filtering.
The MAX9867 also includes two stereo, single-ended
line inputs with gain adjustment, which can be recorded by the ADCs and/or output by the headphone amplifiers. An auxiliary ADC accurately measures a DC
voltage by utilizing the right audio ADC and reporting
the DC voltage through the I2C interface. A jack detection function allows the detection of headphone, microphone, and headset jacks. Insertion and removal
events can be programmed to trigger a hardware interrupt and flag an I2C register bit.
The MAX9867’s flexible clock circuitry utilizes a programmable clock divider and a digital PLL, allowing the DAC
and ADC to operate at maximum dynamic range for all
combinations of master clock (MCLK) and sample rate
(LRCLK) without consuming extra supply current. Any
master clock between 10MHz and 60MHz is supported
as are all sample rates from 8kHz to 48kHz. Master and
slave modes are supported for maximum flexibility.
______________________________________________________________________________________
21
MAX9867
Pin Description (continued)
MAX9867
Ultra-Low Power Stereo Audio Codec
I2C Slave Address
I2C Registers
The MAX9867 responds to the slave address 0x30 for
all write commands and 0x31 for all read operations.
The MAX9867 audio codec is completely controlled
through software using an I2C interface. The power-on
default setting is complete shutdown, requiring that the
internal registers be programmed to activate the device.
See Table 1 for the device’s complete register map.
Table 1. I2C Register Map
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
POWERON RESET
STATE
STATUS
Status (Read Only)
CLD
SLD
ULK
0
0
0
JDET
0
0x00
—
Jack Sense (Read Only)
LSNS
JKSNS
JKMIC
0
0
0
0
0
0x01
—
—
AUX High (Read Only)
AUX[15:8]
0x02
AUX Low (Read Only)
AUX[7:0]
0x03
—
0x04
0x00
0x05
0x00
0x06
0x00
RLK/
NI[0]
0x07
0x00
0
Interrupt Enable
ICLD
ISLD
0
0
IULK
0
SDODLY
0
IJDET
0
CLOCK CONTROL
System Clock
Stereo Audio Clock
Control High
PSCLK
FREQ
PLL
NI[14:8]
Stereo Audio Clock
Control Low
NI[7:1]
DIGITAL AUDIO INTERFACE
Interface Mode
MAS
WCI
BCI
DLY
HIZOFF
0x08
0x00
Interface Mode
0
0
0
LVOLFIX
DMONO
TDM
BSEL
0
0x09
0x00
0
DVFLT
0x0A
0x00
DIGITAL FILTERING
Codec Filters
MODE
AVFLT
LEVEL CONTROL
Sidetone
DAC Level
DSTS
0
0
DACM
ADC Level
DVST
DACG
AVL
0x0B
0x00
DACA
0x0C
0x00
AVR
0x0D
0x00
0x00
Left-Line Input Level
0
LILM
0
0
LIGL
0x0E
Right-Line Input Level
0
LIRM
0
0
LIGR
0x0F
0x00
Left Volume Control
0
VOLLM
VOLL
0x10
0x00
Right Volume Control
0
VOLRM
VOLR
0x11
0x00
Left Microphone Gain
0
PALEN
PGAML
0x12
0x00
Right Microphone Gain
0
PAREN
PGAMR
0x13
0x00
AUXEN
0x14
0x00
0
0x15
0x00
0x16
0x00
0x17
0x00
0xFF
0x42
CONFIGURATION
ADC Input
Microphone
Mode
MXINL
MXINR
MICCLK
DIGMICL DIGMICR
AUXCAP AUXGAIN AUXCAL
DSLEW
VSEN
ZDEN
0
SHDN
LNLEN
LNREN
0
0
0
JDETEN
0
HPMODE
POWER MANAGEMENT
System Shutdown
Revision
22
DALEN
REV
DAREN
ADLEN
ADREN
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
register and are set the next time the event occurs.
Registers 0x02 and 0x03 report the DC level applied to
AUX. See the ADC section for more details and Table 2.
Table 2. Status Registers
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
Status (Read Only)
CLD
SLD
ULK
0
0
0
JDET
0
0x00
Jack Sense (Read Only)
LSNS
JKSNS
JKMIC
0
0
0
0
0
0x01
REGISTER
AUX High (Read Only)
AUX[15:8]
0x02
AUX Low (Read Only)
AUX[7:0]
0x03
BITS
FUNCTION
CLD
Clip Detect Flag
Indicates that a signal has reached or exceeded full scale in the ADC or DAC.
SLD
Slew Level Detect Flag
When volume or gain changes are made, the slewing circuitry smoothly steps through all intermediate
settings. When SLD is set high, all slewing has completed and the volume or gain is at its final value. SLD
is also set when soft-start or stop is complete.
ULK
Digital PLL Unlock Flag
Indicates that the digital audio PLL has become unlocked and digital signal data is not reliable.
JDET
Headset Configuration Change Flag
JDET is set whenever there is a change in register 0x01, indicating that the headset configuration has
changed.
LSNS
LOUTP State (Valid if SHDN = 0, JDETEN = 1)
LSNS is set when the voltage at LOUTP exceeds AVDD - 0.4V. An internal pullup from AVDD to LOUTP
causes this condition whenever there is no load on LOUTP. LSNS is only valid in differential and
capacitorless output modes.
JKSNS
JACKSNS State (Valid if JDETEN = 1)
JKSNS is set when the voltage at JACKSNS exceeds AVDD - 0.4V. An internal pullup from AVDD to
JACKSNS causes this condition whenever there is no load on JACKSNS.
JKMIC
Microphone Detection (Valid if PALEN or PAREN ≠ 00 and JDETEN = 1)
JKMIC is set when JACKSNS exceeds 0.95 x VMICBIAS.
AUX
Auxiliary Input Measurement
AUX is a 16-bit signed two’s complement number representing the voltage measured at JACKSNS/AUX.
Before reading a value from AUX, set AUXCAP to 1 to ensure a stable reading. After reading the value,
set AUXCAP to 0.
Use the following formula to convert the AUX value into an equivalent JACKSNS/AUX voltage:
⎛ AUX ⎞
Voltage = 0.738V × ⎜
⎝ k ⎟⎠
k = AUX value when AUXGAIN = 1. See the ADC section for complete details.
______________________________________________________________________________________
23
MAX9867
Device Status
Status registers 0x00 and 0x01 are read-only registers
that report the status of various device functions. The
status register bits are cleared upon reading the status
MAX9867
Ultra-Low Power Stereo Audio Codec
Hardware Interrupts
accommodate a wide range of system architectures,
the MAX9867 supports three main clocking modes:
• Normal: This mode uses a 15-bit clock divider coefficient to set the sample rate relative to the prescaled
MCLK input (PCLK). This allows high flexibility in both
the MCLK and LRCLK frequencies and can be used
in either master or slave mode.
• Exact Integer: In both master and slave mode, common MCLK frequencies (12MHz, 13MHz, 16MHz,
and 19.2MHz) can be programmed to operate in
exact integer mode for both 8kHz and 16kHz sample
rates. In these modes, the MCLK and LRCLK rates
are selected by using the FREQ bits instead of the NI
and PLL control bits.
• PLL: When operating in slave mode, a PLL can be
enabled to lock onto externally generated LRCLK
signals that are not integer related to PCLK. Prior to
enabling the interface, program NI to the nearest
desired ratio and set the NI[0] = 1 to enable the
PLL’s rapid lock mode. If NI[0] = 0, then NI is ignored
and PLL lock time is slower.
Hardware interrupts are reported on the open-drain IRQ
pin. When an interrupt occurs, IRQ remains low until the
interrupt is serviced by reading the status register 0x00.
If a flag is set, it is reported as a hardware interrupt only
if the corresponding interrupt enable is set. Each bit
enables interrupts for the status flag in the respective
bit location in register 0x00. See Table 3.
SDODLY is used to control the SDOUT timing. See the
Digital Audio Interface section for a detailed description.
Clock Control
The MAX9867 can work with a master clock (MCLK)
supplied from any system clock within the 10MHz-to60MHz range. Internally, the MAX9867 requires a
10MHz-to-20MHz clock. A prescaler divides MCLK by
1, 2, or 4 to create the internal clock (PCLK). PCLK is
used to clock all portions of the MAX9867. See Table 4.
The MAX9867 is capable of supporting any sample rate
from 8kHz to 48kHz, including all common sample rates
(8kHz, 16kHz, 24kHz, 32kHz, 44.1kHz, and 48kHz). To
Table 3. Interrupt Register
REGISTER
Interrupt Enable
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
ICLD
ISLD
IULK
0
0
SDODLY
IJDET
0
0x04
B5
B4
B3
B2
B1
B0
REGISTER
Table 4. Clock Control Registers
REGISTER
System Clock
Stereo Audio Clock
Control High
Stereo Audio Clock
Control Low
BITS
PSCLK
24
B7
B6
0
0
PSCLK
PLL
FREQ
0x05
NI[14:8]
NI[7:1]
0x06
NI[0]
FUNCTION
MCLK Prescaler
Divides MCLK to generate a PCLK between 10MHz and 20MHz.
00 = Disable clock for low-power shutdown.
01 = Select if MCLK is between 10MHz and 20MHz.
10 = Select if MCLK is between 20MHz and 40MHz.
11 = Select if MCLK is between 40MHz and 60MHz.
______________________________________________________________________________________
0x07
Ultra-Low Power Stereo Audio Codec
MAX9867
Table 4. Clock Control Registers (continued)
BITS
FUNCTION
Exact Integer Modes
Allows integer sampling for specific PCLK (prescaled MCLK) frequencies and 8kHz or 16kHz sample rates.
FREQ[3:0]
PCLK (MHz)
LRCLK (kHz)
PCLK/LRCLK
Normal or PLL mode
0x00
Reserved
0x1–0x7
FREQ
PLL
Reserved
Reserved
0x8
12
8
1500
0x9
12
16
750
0xA
13
8
1625
0xB
13
16
812.5
0xC
16
8
2000
0xD
16
16
1000
0xE
19.2
8
2400
0xF
19.2
16
1200
Modes 0x8–0xF are available in either master or slave mode. In slave mode, if the indicated PCLK/LRCLK ratio
cannot be guaranteed, use PLL mode instead.
PLL Mode Enable
0 = Valid for slave and master mode. The frequency of LRCLK is set by the NI divider bits. In master mode, the
MAX9867 generates LRCLK using the specified divide ratio. In slave mode, the MAX9867 expects an
LRCLK as specified by the divide ratio.
1 = Valid for slave mode only. A digital PLL locks on to any externally supplied LRCLK signal.
Rapid Lock Mode
To enable rapid lock mode, set NI to the nearest desired ratio and set NI[0] = 1 before enabling the interface.
Normal Mode LRCLK Divider
When PLL = 0, the frequency of LRCLK is determined by NI. See Table 5 for common NI values.
NI = (65536 x 96 x fLRCLK)/fPCLK
NI
fLRCLK = LRCLK frequency
fPCLK = Prescaled MCLK internal clock frequency (PCLK)
LRCLK > 24kHz is only valid for MODE = 0 (stereo audio mode). MODE = 1 (voice mode) requires LRCLK ≤
24kHz.
Table 5. Common NI Values
MCLK (MHz)
LRCLK (kHz)
PSCLK
8
11.2896
01
0x116A
12
01
0x1062
12.288
01
0x1000
16
24
32
44.1
48
0x22D4
0x343F
0x20C5
0x3127
0x45A9
0x6000
0x687D
0x4189
0x5A51
0x2000
0x624E
0x3000
0x4000
0x5833
0x6000
13
01
0x0F20
0x1E3F
0x2D5F
0x3C7F
0x535F
0x5ABE
19.2
01
0x0A3D
0x147B
0x1EB8
0x28F6
0x3873
0x3D71
24
10
0x1062
0x20C5
0x1893
0x4189
0x5A51
0x624E
26
10
0x0F20
0x1E3F
0x16AF
0x3C7F
0x535F
0x5ABE
27
10
0x0E90
0x1D21
0x15D8
0x3A41
0x5048
0x5762
Note: Bolded values are exact integers that provide maximum full-scale performance.
______________________________________________________________________________________
25
MAX9867
Ultra-Low Power Stereo Audio Codec
Digital Audio Interface
mode, BCLK can be configured in a number of ways to
ensure compatiblity with other audio devices.
LVOLFIX is used to fix the line input playback volume to
0dB regardless of VOLL and VOLR. See the Line Inputs
section for complete details and Table 6.
The MAX9867’s digital audio interface supports a wide
range of operating modes to ensure maximum compatibility. See Figures 1–4 for timing diagrams. In master
mode, the MAX9867 outputs LRCLK and BCLK, while in
slave mode they are inputs. When operating in master
Table 6. Digital Audio Interface Registers
REGISTER
B7
B6
B5
Interface Mode
MAS
WCI
BCI
Interface Mode
0
0
0
BITS
MAS
WCI
BCI
SDODLY
DLY
HIZOFF
LVOLFIX
26
B4
B3
B2
DLY
HIZOFF
TDM
LVOLFIX
DMONO
B1
B0
0
0
BSEL
REGISTER
ADDRESS
0x08
0x09
FUNCTION
Master Mode
0 = The MAX9867 operates in slave mode with LRCLK and BCLK configured as inputs.
1 = The MAX9867 operates in master mode with LRCLK and BCLK configured as outputs.
LRCLK Invert
0 = Left-channel data is input and output while LRCLK is low.
1 = Right-channel data is input and output while LRCLK is low.
Note: WCI is ignored when TDM = 1.
BCLK Invert
In master and slave modes:
0 = SDIN is latched into the part on the rising edge of BCLK.
SDOUT transitions after the rising edge of BCLK as determined by SDODLY.
1 = SDIN is latched into the part on the falling edge of BCLK.
SDOUT transitions after the falling edge of BCLK as determined by SDODLY.
In master mode:
0 = LRCLK changes state immediately after the rising edge of BCLK.
1 = LRCLK changes state immediately after the falling edge of BCLK.
SDOUT Delay
0 = SDOUT transitions one half BCLK cycle after SDIN is latched into the part.
1 = SDOUT transitions on the same BCLK edge as SDIN is latched into the part.
See Figures 1–4 for complete details. See Register 0x04 (interrupt registers).
Delay Mode
0 = SDIN/SDOUT data is latched on the first BCLK edge following an LRCLK edge.
1 = SDIN/SDOUT data is assumed to be delayed one BCLK cycle so that it is latched on the 2nd BCLK edge
following an LRCLK edge (I2S-compatible mode).
Note: DLY is ignored when TDM = 1.
SDOUT High-Impedance Mode
0 = SDOUT goes to a high-impedance state after all data bits have been transferred out of the MAX9867,
allowing SDOUT to be shared by other devices.
1 = SDOUT is set either high or low after all data bits have been transferred out of the MAX9867.
Note: High-impedance mode is intended for use when TDM = 1.
See the Line Inputs section.
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
Table 6. Digital Audio Interface Registers (continued)
BITS
TDM
DMONO
BSEL
FUNCTION
TDM Mode Select
0 = LRCLK signal polarity indicates left and right audio.
1 = LRCLK is a framing pulse that transitions polarity to indicate the start of a frame of audio data consisting
of multiple channels.
When operating in TDM mode, the left channel is output immediately following the frame sync pulse. If rightchannel data is being transmitted, the 2nd channel of data immediately follows the 1st channel data.
Mono Playback Mode
0 = Stereo data input on SDIN is processed separately.
1 = Stereo data input on SDIN is mixed to a single channel and routed to both the left and right DAC.
BCLK Select
Configures BCLK when operating in master mode. BSEL has no effect in slave mode. Set BSEL = 010, unless
sharing the bus with multiple devices:
000 = Off
001 = 64x LRCLK (192x internal clock divided by 3)
010 = 48x LRCLK (192x internal clock divided by 4)
011 = Reserved for future use.
100 = PCLK/2
101 = PCLK/4
110 = PCLK/8
111 = PCLK/16
______________________________________________________________________________________
27
MAX9867
Ultra-Low Power Stereo Audio Codec
AUDIO MASTER MODES:
LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
LEFT
RIGHT
1/fS
RELATIVE TO PCLK (SEE NOTE)
D15
SDOUT
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
7ns (typ)
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15
7ns (typ)
BCLK
25ns (min)
CONFIGURED BY BSEL
0ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED + LRCLK INVERT: WCI = 1, BCI = 0, DLY = 0, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
RIGHT
LEFT
1/fS
RELATIVE TO PCLK (SEE NOTE)
D15
SDOUT
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
7ns (typ)
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15
7ns (typ)
BCLK
25ns (min)
CONFIGURED BY BSEL
0ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED + BCLK INVERT: WCI = 0, BCI = 1, DLY = 0, SDODLY = 0
7ns (typ)
7ns (typ)
LEFT
LRCLK
RIGHT
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
7ns (typ)
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
7ns (typ)
BCLK
25ns (min)
SDIN
0ns (min)
CONFIGURED BY BSEL
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
NOTE: THE DELAY FROM A BCLK EDGE AND AN LRCLK EDGE IS DETERMINED BY LENGTH OF TIME THAT PCLK (THE INTERNALLY DIVIDED DOWN VERSION OF MCLK AS DEFINED BY THE PSCLK BITS) IS HIGH DURING ONE PERIOD OF
MCLK PLUS THE INTERNAL DELAY. FOR EXAMPLE: IF PCLK = 12.288MHZ, THEN THE DELAY BETWEEN BCLK AND LRCLK IS TYPICALLY 45ns.
Figure 1. Digital Audio Interface Audio Master Mode Example (Sheet 1 of 2)
28
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
I2S: WCI = 0, BCI = 0, DLY = 1, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
LEFT
RIGHT
1/fS
RELATIVE TO PCLK (SEE NOTE)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDOUT
40ns (max)
0ns (min)
7ns (typ)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
7ns (typ)
BCLK
25ns (min)
CONFIGURED BY BSEL
0ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 1
7ns (typ)
7ns (typ)
LRCLK
LEFT
RIGHT
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
7ns (typ)
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
7ns (typ)
BCLK
25ns (min)
SDIN
0ns (min)
CONFIGURED BY BSEL
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
NOTE: THE DELAY FROM A BCLK EDGE AND AN LRCLK EDGE IS DETERMINED BY LENGTH OF TIME THAT PCLK (THE INTERNALLY DIVIDED DOWN VERSION OF MCLK AS DEFINED BY THE PSCLK BITS) IS HIGH DURING ONE PERIOD OF
MCLK PLUS THE INTERNAL DELAY. FOR EXAMPLE: IF PCLK = 12.288MHZ, THEN THE DELAY BETWEEN BCLK AND LRCLK IS TYPICALLY 45ns.
Figure 1. Digital Audio Interface Audio Master Mode Example (Sheet 2 of 2)
______________________________________________________________________________________
29
MAX9867
Ultra-Low Power Stereo Audio Codec
VOICE (TDM, PCM) MASTER MODES:
BCI = 0, HIZOFF = 0, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
40ns (max)
0ns (min)
L5
L4
L3
L2
L1
7ns (typ)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
7ns (typ)
BCLK
25ns (min)
SDIN
CONFIGURED BY BSEL
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 1, HIZOFF = 0, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
40ns (max)
0ns (min)
L5
L4
L3
L2
L1
7ns (typ)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
7ns (typ)
BCLK
25ns (min)
SDIN
CONFIGURED BY BSEL
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 0, HIZOFF = 1, SDODLY = 0
7ns (typ)
7ns (typ)
LRCLK
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
40ns (max)
0ns (min)
L5
L4
L3
L2
L1
7ns (typ)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
7ns (typ)
BCLK
25ns (min)
SDIN
CONFIGURED BY BSEL
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 0, HIZOFF = 0, SDODLY = 1
7ns (typ)
7ns (typ)
LRCLK
1/fS
RELATIVE TO PCLK (SEE NOTE)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
40ns (max)
0ns (min)
L6
L5
L4
L3
L2
L1
7ns (typ)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
7ns (typ)
BCLK
25ns (min)
SDIN
CONFIGURED BY BSEL
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
Figure 2. Digital Audio Interface Voice Master Mode Examples
30
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
AUDIO SLAVE MODES:
LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 0
LRCLK
LEFT
RIGHT
1/fS
0ns (min)
25ns (min)
D15
SDOUT
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15
30ns (min)
BCLK
25ns (min)
75ns (min)
0ns (min)
30ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED + LRCLK INVERT: WCI = 1, BCI = 0, DLY = 0, SDODLY = 0
LRCLK
RIGHT
LEFT
1/fS
0ns (min)
25ns (min)
SDOUT
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15
30ns (min)
BCLK
25ns (min)
75ns (min)
0ns (min)
30ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED + BCLK INVERT: WCI = 0, BCI = 1, DLY = 0, SDODLY = 0
RIGHT
LEFT
LRCLK
1/fS
0ns (min)
25ns (min)
SDOUT
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
30ns (min)
BCLK
25ns (min)
SDIN
0ns (min)
75ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
30ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 3. Digital Audio Interface Audio Slave Mode Examples (Sheet 1 of 2)
______________________________________________________________________________________
31
MAX9867
Ultra-Low Power Stereo Audio Codec
I2S: WCI = 0, BCI = 0, DLY = 1, SDODLY = 0
LEFT
LRCLK
RIGHT
1/fS
0ns (min)
25ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDOUT
40ns (max)
0ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
30ns (min)
BCLK
25ns (min)
75ns (min)
0ns (min)
30ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SDIN
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
LEFT JUSTIFIED: WCI = 0, BCI = 0, DLY = 0, SDODLY = 1
LRCLK
LEFT
RIGHT
1/fS
0ns (min)
25ns (min)
SDOUT
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
40ns (max)
0ns (min)
D15
D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
30ns (min)
BCLK
25ns (min)
SDIN
0ns (min)
75ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
30ns (min)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 3. Digital Audio Interface Audio Slave Mode Examples (Sheet 2 of 2)
32
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
VOICE (TDM, PCM) SLAVE MODES:
BCI = 0, HIZOFF = 0, SDODLY = 0
LRCLK
1/fS
0ns (min)
25ns (min)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
40ns (max)
0ns (min)
L6
L5
L4
L3
L2
L1
0ns (min)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
30ns (min)
BCLK
25ns (min)
SDIN
75ns (min)
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
30ns (min)
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 1, HIZOFF = 0, SDODLY = 0
LRCLK
1/fS
0ns (min)
25ns (min)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
40ns (max)
0ns (min)
L6
L5
L4
L3
L2
L1
0ns (min)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
30ns (min)
BCLK
25ns (min)
SDIN
75ns (min)
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
30ns (min)
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 0, HIZOFF = 1, SDODLY = 0
LRCLK
1/fS
25ns (min)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
40ns (max)
0ns (min)
L6
L5
L4
L3
L2
L1
0ns (min)
0ns (min)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
30ns (min)
BCLK
25ns (min)
SDIN
75ns (min)
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
30ns (min)
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
BCI = 0, HIZOFF = 0, SDODLY = 1
LRCLK
1/fS
25ns (min)
SDOUT
L15 L14 L13 L12 L11 L10 L9
L8
L7
40ns (max)
0ns (min)
L6
L5
L4
L3
L2
L1
0ns (min)
0ns (min)
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
30ns (min)
BCLK
25ns (min)
SDIN
75ns (min)
0ns (min)
L15 L14 L13 L12 L11 L10 L9
L8
L7
L6
L5
L4
L3
30ns (min)
L2
L1
L0 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0
Figure 4. Digital Audio Interface Voice Slave Mode Examples
______________________________________________________________________________________
33
MAX9867
Ultra-Low Power Stereo Audio Codec
Digital Filtering
stopband attenuation as well as selectable highpass filters. The FIR filters provide low-power consumption and
are linear phase to maintain stereo imaging. Table 7 is
the digital filtering register.
The MAX9867 incorporates both IIR (voice) and FIR
(audio) digital filters to accomodate a wide range of
audio sources. The IIR fiilters provide over 70dB of
Table 7. Digital Filtering Register
REGISTER
Codec Filters
B7
B6
MODE
B5
B4
B3
AVFLT
B2
B1
0
BITS
B0
REGISTER
ADDRESS
DVFLT
0x0A
FUNCTION
MODE
Digital Audio Filter Mode
0 = IIR Voice Filters
1 = FIR Audio Filters
AVFLT
ADC Digital Audio Filter
MODE = 0
Select the desired digital filter response from Table 8. See the Frequency Response graph in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter is disabled. Any other setting = DC-blocking filter is enabled.
DVFLT
DAC Digital Audio Filter
MODE = 0
Select the desired digital filter response from Table 8. See the Frequency Response graph in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter is disabled. Any other setting = DC-blocking filter is enabled.
Table 8. IIR Highpass Digital Filters
CODE
FILTER TYPE
INTENDED SAMPLE
RATE (kHz)
0x0
217Hz NOTCH
Disabled
0x1
Elliptical
16
256
Yes
0x2
Butterworth
16
500
No
0x3
Elliptical
8
256
Yes
0x4
Butterworth
8
500
No
0x5
Butterworth
8 to 24
fS/240
No
0x6 to 0x7
34
HIGHPASS CORNER
FREQUENCY (Hz)
Reserved
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
gain adjustment is also provided to set the sidetone
level relative to the playback level. Table 9 is the digital
gain registers.
Table 9. Digital Gain Registers
REGISTER
B7
Sidetone
B6
B5
DSTS
DAC Level
0
DVST
DACM
B2
B1
DVST
DACG
AVL
BITS
DSTS
B3
0
DACM
ADC Level
B4
B0
REGISTER
ADDRESS
0x0B
DACA
0x0C
AVR
0x0D
FUNCTION
Digital Sidetone Source Mixer
00 = No sidetone is selected.
01 = Left ADC
10 = Right ADC
11 = Left + right ADC
Digital Sidetone Level Control
All gain settings are relative to the ADC input voltage.
Differential Headphone Output Mode
SETTING
GAIN (dB)
SETTING
0x00
Off
0x0B
0x01
0
0x0C
0x02
-2
0x0D
0x03
-4
0x0E
0x04
-6
0x0F
0x05
-8
0x10
0x06
-10
0x11
0x07
-12
0x12
0x08
-14
0x13
0x09
-16
0x14
0x0A
-18
0x15
GAIN (dB)
-20
-22
-24
-26
-28
-30
-32
-34
-36
-38
-40
SETTING
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
—
GAIN (dB)
-42
-44
-46
-48
-50
-52
-54
-56
-58
-60
—
Capacitorless and Single-Ended Headphone Output Mode
SETTING
GAIN (dB)
SETTING
GAIN (dB)
0x00
Off
0x0B
-25
0x01
-5
0x0C
-27
0x02
-7
0x0D
-29
0x03
-9
0x0E
-31
0x04
-11
0x0F
-33
0x05
-13
0x10
-35
0x06
-15
0x11
-37
0x07
-17
0x12
-39
0x08
-19
0x13
-41
0x09
-21
0x14
-43
0x0A
-23
0x15
-45
SETTING
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
—
GAIN (dB)
-47
-49
-51
-53
-55
-57
-59
-61
-63
-65
—
DAC Mute Enable
0 = No mute
1 = Mute
______________________________________________________________________________________
35
MAX9867
Digital Gain Control
The MAX9867 includes digital gain adjustment for the
playback and record paths. Independent gain adjustment is provided for the two record channels. Sidetone
MAX9867
Ultra-Low Power Stereo Audio Codec
Table 9. Digital Gain Registers (continued)
BITS
DACG
DACA
AVL/AVR
FUNCTION
DAC Gain
00 = 0dB
01 = +6dB
10 = +12dB
11 = +18dB
Note: DACG is only used when MODE = 0. If MODE = 1, the DAC level is only set by DACA.
DAC Level Control
DACA works in all modes.
SETTING
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
ADC Left/Right Level Control
SETTING
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
GAIN (dB)
0
-1
-2
-3
-4
-5
-6
-7
SETTING
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
GAIN (dB)
-8
-9
-10
-11
-12
-13
-14
-15
GAIN (dB)
+3
+2
+1
0
-1
-2
-3
-4
SETTING
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
GAIN (dB)
-5
-6
-7
-8
-9
-10
-11
-12
Line Inputs
to the headphone amplifier and can be optionally connected to the ADC for recording. Table 10 lists the line
input registers.
The MAX9867 includes one pair of single-ended line
inputs. When enabled, the line inputs connect directly
Table 10. Line Input Registers
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
Left-Line Input Level
0
LILM
0
0
LIGL
0x0E
Right-Line Input Level
0
LIRM
0
0
LIGR
0x0F
36
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
Table 10. Line Input Registers (continued)
BITS
FUNCTION
Line-Input Left/Right Playback Mute
0 = Line input is connected to the headphone amplifiers.
1 = Line input is disconnected from the headphone amplifiers.
LILM/LIRM
Line-Input Left/Right Gain
LIGL/LIGR
SETTING
GAIN (dB)
SETTING
GAIN (dB)
0x0
+24
0x8
+8
0x1
+22
0x9
+6
0x2
+20
0xA
+4
+2
0x3
+18
0xB
0x4
+16
0xC
0
0x5
+14
0xD
-2
0x6
+12
0xE
-4
0x7
+10
0xF
-6
Fix Line Input Volume
0 = Line input to headphone output volume tracks VOLL and VOLR bits.
1 = Line input to headphone output volume fixed at VOLL and VOLR bits.
See the Digital Audio Interface section.
LVOLFIX
Playback Volume
registers 0x10 and 0x11 to set the desired volume. See
Table 11.
The MAX9867 incorporates volume and mute control to
allow level control for the playback audio path. Program
Table 11. Playback Volume Registers
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
Left Volume Control
0
VOLLM
VOLL
0x10
Right Volume Control
0
VOLRM
VOLR
0x11
______________________________________________________________________________________
37
MAX9867
Ultra-Low Power Stereo Audio Codec
Table 11. Playback Volume Registers (continued)
BITS
VOLLM/VOLRM
FUNCTION
Left/Right Playback Mute
VOLLM and VOLRM mute both the DAC and line input audio signals.
0 = Audio playback is unmuted.
1 = Audio playback is muted
Note: VSEN has no effect on the mute function. When VOLLM or VOLRM is set, the output is muted
immediately (ZDEN = 1) or at the next zero-crossing (ZDEN = 0).
Left/Right Playback Volume
VOLL and VOLR control the playback volume for both the DAC and line input audio signals.
VOLL/VOLR
SETTING
GAIN (dB)
SETTING
GAIN (dB)
SETTING
GAIN (dB)
0x00
+6
0x0E
-5
0x1C
-42
0x01
+5.5
0x0F
-6
0x1D
-46
0x02
+5
0x10
-8
0x1E
-50
0x03
+4.5
0x11
-10
0x1F
-54
0x04
+4
0x12
-12
0x20
-58
0x05
+3.5
0x13
-14
0x21
-62
0x06
+3
0x14
-16
0x22
-66
0x07
+2
0x15
-18
0x23
-70
0x08
+1
0x16
-20
0x24
-74
0x09
0
0x17
-22
0x25
-78
0x0A
-1
0x18
-26
0x26
-82
0x0B
-2
0x19
-30
0x27
-84
0x0C
-3
0x1A
-34
0x28 to 0x3F
MUTE
0x0D
-4
0x1B
-38
Note: Gain settings apply when the headphone amplifier is configured in differential mode. In the singleended and capacitorless modes, the actual gain is 5dB lower for each setting.
Microphone Inputs
the ADCs. The first stage offers selectable 0dB, 20dB,
or 30dB settings. The second stage is a programmable
gain amplifier (PGA) adjustable from 0dB to 20dB in
1dB steps. Zero-crossing detection is included on the
PGA to minimize zipper noise while making gain
changes. See Figure 5 for a detailed diagram of the
microphone input structure. Table 12 is the microphone
input register.
Two differential microphone inputs and a low-noise microphone bias for powering the microphones are provided
by the MAX9867. In typical applications, the left microphone records a voice signal and the right microphone
records a background noise signal. In applications that
require only one microphone, use the left microphone
input and disable the right ADC. The microphone signals
are amplified by two stages of gain and then routed to
Table 12. Microphone Input Registers
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
Left Microphone Gain
0
PALEN
PGAML
0x12
Right Microphone Gain
0
PAREN
PGAMR
0x13
38
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
MAX9867
Table 12. Microphone Input Registers (continued)
BITS
FUNCTION
Left/Right Microphone Preamplifier Gain
Enables the microphone circuitry and sets the preamplifier gain.
00 = Disabled
01 = 0dB
10 = +20dB
11 = +30dB
PALEN/PAREN
Left/Right Microphone Programmable Gain Amplifier
PGAML/PGAMR
SETTING
GAIN (dB)
SETTING
GAIN (dB)
0x00
+20
0x0B
+9
0x01
+19
0x0C
+8
0x02
+18
0x0D
+7
0x03
+17
0x0E
+6
0x04
+16
0x0F
+5
0x05
+15
0x10
+4
0x06
+14
0x11
+3
0x07
+13
0x12
+2
0x08
+12
0x13
+1
0x09
+10
0x0A
+11
0x14
to 0x1F
0
MAX9867
MICBIAS
1.5V
0/20/30dB
VREG
0dB TO +20dB
MICLP
MICLN
PREAMP
PGA
ADC
L
-
0/20/30dB
VREG
0dB TO +20dB
MICRP
MICRN
PREAMP
PGA
ADC
R
Figure 5. Microphone Input Signal Path
______________________________________________________________________________________
39
MAX9867
Ultra-Low Power Stereo Audio Codec
ADC
The MAX9867 includes two 16-bit ADCs. The first ADC
is used to record left-channel microphone and line-input
audio signals. The second ADC can be used to record
right-channel microphone and line-input signals, or it
can be configured to accurately measure DC voltages.
When measuring DC voltages, both the left and right
ADCs must be enabled by setting ADLEN and ADREN
in register 0x17. The input to the second ADC is JACKSNS/AUX and the output is reported in AUX (registers
0x02 and 0x03). Since the audio ADC is used to perform the measurement, the digital audio interface must
be properly configured. If the left ADC is being used to
convert audio, the DC measurement is performed at the
same sample rate. When not using the left ADC, configure the digital interface for a 48kHz sample rate to
ensure the fastest possible settling time.
To ensure accurate results, the MAX9867 includes two
calibration routines. Calibrate the ADC each time the
MAX9867 is powered on. Calibration settings are not
lost if the MAX9867 is placed in shutdown. When making a measurement, set AUXCAP to 1 to prevent AUX
from changing while reading the registers.
Setup Procedure
1) Ensure a valid MCLK signal is provided and configure PSCLK appropriately.
2) Choose a clocking mode. The following options are
possible:
• Slave mode with LRCLK and BCLK signals provided. The measurement sample rate is determined by the external clocks.
• Slave mode with no LRCLK and BCLK signals
provided. Configure the device for normal clock
mode using the NI ratio. Select fS = 48kHz to allow
for the fastest settling times.
• Master mode with audio. Configure the device in
normal mode using the NI ratio or exact integer
mode using FREQ as required by the audio signal.
• Master mode without audio. Configure the
device in normal mode using the NI ratio. Select fS
= 48kHz to allow for the fastest settling times.
3) Ensure JACKSNS is disabled.
4) Enable the left and right ADC; take the MAX9867 out
of shutdown.
Offset Calibration Procedure
Perform the following steps before the first DC measurement is taken after applying power to the
MAX9867:
40
Table 13. AUX ADC Wait Times
WAIT TIMES
LRCLK (kHz)
WAIT TIME (ms)
48
40
44.1
44
32
60
24
80
22.05
90
16
120
12
160
11.025
175
8
240
1) Enable the AUX input (AUXEN = 1).
2) Enable the offset calibration (AUXCAL = 1).
3) Wait the appropriate time (see Table 13).
4) Complete calibration (AUXCAL = 0).
Gain Calibration Procedure
Perform the following steps the first time a DC measurement is taken after applying power to the MAX9867 or if
the temperature changes significantly:
1) Enable the AUX input (AUXEN = 1).
2) Start gain calibration (AUXGAIN = 1).
3) Wait the appropriate time (see Table 13).
4) Freeze the measurement results (AUXCAP = 1).
5) Read AUX and store the value in memory to correct
all future measurements (k = AUX[15:0], k is typically 19500).
6) Complete calibration (AUXGAIN = AUXCAP = 0).
DC Measurement Procedure
Perform the following steps after offset and gain calibration are complete:
1) Enable the AUX input (AUXEN = 1).
2) Wait the appropriate time (see Table 13).
3) Freeze the measurement results (AUXCAP = 1).
4) Read AUX and correct with the gain calibration
value:
⎛ AUX[15 : 0] ⎞
VAUX = 0.738⎜
⎟
⎝
⎠
k
5) Complete measurement (AUXCAP = 0).
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
b. Wait 40ms.
c. Freeze the measurement results (AUXCAP = 1).
d. Read AUX and store the value in memory to correct all future measurements (k = AUX[15:0]).
e. Complete calibration (AUXGAIN = AUXCAP =
AUXEN = 0).
6) Measure the voltage on JACKSNS/AUX:
a.
b.
c.
d.
c. Wait 40ms.
d. Complete calibration (AUXCAL = 0).
Enable the AUX input (AUXEN = 1).
Wait 40ms.
Freeze the measurement results (AUXCAP = 1).
Read AUX and correct with the gain calibration
value.
e. Complete measurement (AUXCAP = 0).
7) DC measurement complete.
5) Calibrate the gain:
a. Start gain calibration (AUXGAIN = 1).
Table 14. ADC Input Register
REGISTER
ADC Input
BITS
MXINL/MXINR
AUXCAP
AUXGAIN
AUXCAL
AUXEN
B7
B6
MXINL
B5
B4
MXINR
B3
B2
B1
B0
REGISTER
ADDRESS
AUXCAP
AUXGAIN
AUXCAL
AUXEN
0x14
FUNCTION
Left/Right ADC Audio Input Mixer
00 = No input is selected.
01 = Left/right analog microphone
10 = Left/right line input
11 = Left/right analog microphone + line input
Note: If the right-line input is disabled, then the left-line input is connected to both mixers. Enabling the
left and right digital microphones disables the left and right audio mixers, respectively. See DIGMICL/
DIGMICR in Table 15 for more details.
Auxiliary Input Capture
0 = Update AUX with the voltage at JACKSNS/AUX.
1 = Hold AUX for reading.
Auxiliary Input Gain Calibration
0 = Normal operation
1 = The input buffer is disconnected from JACKSNS/AUX and connected to an internal voltage reference.
While in this mode, read the AUX register and store the value. Use the stored value as a gain
calibration factor, K, on subsequent readings.
Auxiliary Input Offset Calibration
0 = Normal operation
1 = JACKSNS/AUX is disconnected from the input and the ADC automatically calibrates out any internal
offsets.
Auxiliary Input Enable
0 = Use JACKSNS/AUX for jack detection.
1 = Use JACKSNS/AUX for DC measurements.
Note: For AUXEN = 1, set MXINR = 00, ADLEN = 1, and ADREN = 1.
______________________________________________________________________________________
41
MAX9867
Complete DC Measurement Example
MCLK = 13MHz, slave mode, BCLK and LRCLK not
externally supplied:
1) Configure the digital audio interface for fS = 48kHz
(PSCLK = 01, FREQ = 0x0, PLL = 0, NI = 0x5ABE,
MAS = 0).
2) Disable JACKSNS (JDETEN = 0).
3) Enable the left and right ADC; take the MAX9867 out
of shutdown (ADLEN = ADREN = SHDN = 1).
4) Calibrate the offset:
a. Enable the AUX input (AUXEN = 1).
b. Enable the offset calibration (AUXCAL = 1).
MAX9867
Ultra-Low Power Stereo Audio Codec
Digital Microphone Input
phone input. The right analog microphone input is still
available to allow a combination of analog and digital
microphones to be used. Figure 6 shows the digital
microphone interface timing diagram. See Table 15.
The MAX9867 can accept audio from up to two digital
microphones. When using digital microphones, the left
analog microphone input is retasked as a digital micro-
Table 15. Digital Microphone Input Register
REGISTER
B7
Microphone
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
DIGMICL
DIGMICR
0
0
0
0
0x15
B6
MICCLK
BITS
MICCLK
DIGMICL/DIGMICR
FUNCTION
Digital Microphone Clock
00 = PCLK/8
01 = PCLK/6
10 = Reserved
11 = Reserved
Digital Left/Right Microphone Enable
DIGMICL
DIGMICR
0
0
Left ADC Input
Right ADC Input
ADC input mixer
ADC input mixer
Line input (left analog
0
1
Right digital microphone
microphone unavailable)
1
0
Left digital microphone
ADC input mixer
1
1
Left digital microphone Right digital microphone
Note: The left analog microphone input is never available when DIGMICL or DIGMICR = 1.
1/fMICCLK
DIGMICCLK
tHD, MIC
DIGMICDATA
LEFT
tSU, MIC
tHD, MIC
RIGHT
tSU, MIC
LEFT
RIGHT
Figure 6. Digital Microphone Timing Diagram
42
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
Headset Detection Overview
The MAX9867 features headset detection that can detect
the insertion and removal of a jack as well as the load
type. When a jack is detected, an interrupt on IRQ can be
triggered to alert the microcontroller of the event. Figure 7
shows the typical configuration for jack detection.
Sleep-Mode Headset Detection
When the MAX9867 is in shutdown and the power supply
is available, sleep-mode headset detection can be
enabled to detect jack insertion. Sleep mode applies a
4µA pullup current to JACKSNS/AUX and LOUTP that
forces the voltage on JACKSNS/AUX and LOUTP to
AVDD when no load is applied. When a jack is inserted,
either JACKSNS, LOUTP (assuming the headphone
amplifier is not configured in single-ended mode), or both
are loaded sufficiently to reduce the output voltage to
nearly 0V and clear the JKSNS or LSNS bits, respectively.
The change in the LSNS and JKSNS bits sets JDET and
triggers an interrupt on IRQ if IJDET is set. The interrupt
signals the microcontroller that a jack has been inserted,
allowing the microcontroller to respond as desired.
Headphone Modes
The headphone amplifier supports differential, singleended, and capacitorless output modes, as shown in
Figure 8. In each mode, the amplifier can be configured
for stereo or mono operation. The differential and
capacitorless modes are inherently click and pop free.
The single-ended mode optionally includes click-andpop reduction to eliminate the click and pop that would
normally be caused by the output coupling capacitor.
When click-and-pop reduction is not required in the single-ended configuration, leave LOUTN and ROUTN
unconnected.
LOUTP
GND
MIC
HPR
MICBIAS
HPL
JACKSNS/AUX
ROUTP
MICLP
LOUTN
Figure 7. Typical Configuration for Headset Detection
DIFFERENTIAL
CAPACITORLESS
SINGLE ENDED
220µF
LOUTP
LOUTP
LOUTP
LOUTN
LOUTN
LOUTN
1µF
220µF
ROUTP
ROUTP
ROUTP
ROUTN
ROUTN
ROUTN
1µF
OPTIONAL COMPONENTS REQUIRED FOR CLICK AND POP SUPPRESSION ONLY
Figure 8. Headphone Amplifier Modes
______________________________________________________________________________________
43
MAX9867
Powered-On Headset Detection
When the MAX9867 is in normal operation and the microphone interface is enabled, jack insertion and removal can
be detected through the JACKSNS/AUX pin. As shown in
Figure 7, VMIC is pulled up by MICBIAS. When a microphone is connected, VMIC is assumed to be between 0V
and 95% of VMICBIAS. If the jack is removed, VMIC increases to VMICBIAS. This event causes JKMIC to be set, alerting the system that the headset has been removed.
Alternatively, if the jack is inserted, VMIC decreases to
below 95% of VMICBIAS and JKMIC is cleared, alerting the
system that a jack has been inserted. The JKMIC bit can
be configured to create a hardware interrupt that alerts the
microcontroller of jack removal and insertion events.
Mode Configuration
The MAX9867 includes circuitry to minimize click-andpop during volume changes, detect headsets, and configure the headphone amplifier mode. Both volume
slewing and zero-crossing detection are included to
ensure click-and-pop free volume transitions. Table 16
is the mode configuration register.
MAX9867
Ultra-Low Power Stereo Audio Codec
Table 16. Mode Configuration Register
REGISTER
Mode
B7
B6
B5
B4
B3
DSLEW
VSEN
ZDEN
0
JDETEN
BITS
DSLEW
VSEN
ZDEN
JDETEN
HPMODE
B2
B1
B0
HPMODE
0x16
FUNCTION
Digital Volume Slew Speed
0 = Digital volume changes are slewed over 10ms.
1 = Digital volume changes are slewed over 80ms.
Volume Change Smoothing
0 = Volume changes slew through all intermediate values.
1 = Volume changes occur in one step.
Line Input Zero-Crossing Detection
0 = Line input volume changes occur at zero crossings in the audio waveform or after 62ms if no zero
crossing occurs.
1 = Line-input volume changes occur immediately.
Jack Detection Enable
SHDN = 0: Sleep Mode
Enables pullups on LOUTP and JACKSNS/AUX to detect jack insertion. LSNS and JKSNS are valid.
LOUTP detection is only valid in differential and capacitorless output modes.
SHDN = 1: Normal Mode
Enables the comparator circuitry on JACKSNS/AUX to detect voltage changes. JKMIC is valid if the
microphone circuitry is enabled.
Note: AUXEN must be set to 0 for jack detection to function.
Headphone Amplifier Mode
HPMODE
Mode
000
Stereo differential (clickless)
001
Mono (left) differential (clickless)
010
Stereo capacitorless (clickless)
011
Mono (left) capacitorless (clickless)
100
Stereo single-ended (clickless)
101
Mono (left) single-ended (clickless)
110
Stereo single-ended (fast turn-on)
111
Mono (left) single-ended (fast turn-on)
Note: In mono operation, the right amplifier is disabled.
44
REGISTER
ADDRESS
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
Table 17. Power-Management Register
REGISTER
System Shutdown
B7
B6
B5
B4
B3
B2
B1
B0
REGISTER
ADDRESS
SHDN
LNLEN
LNREN
0
DALEN
DAREN
ADLEN
ADREN
0x17
BITS
SHDN
LNLEN
LNREN
DALEN
DAREN
ADLEN
ADREN
FUNCTION
Shutdown
Places the device in low-power shutdown mode.
Left-Line Input Enable
Enables the left-line input preamp and automatically enables the left and right headphone amplifiers.
If LNREN = 0, the left-line input signal is also routed to the right ADC input mixer and right headphone
amplifier.
Note: Control of the right headphone amplifier can be overridden by HPMODE.
Right-Line Input Enable
Enables the right-line input preamp and automatically enables the right headphone amplifier.
Note: Control of the right headphone amplifier can be overridden by HPMODE.
Left DAC Enable
Enables the left DAC and automatically enables the left and right headphone amplifiers. If DAREN = 0, the
left DAC signal is also routed to the right headphone amplifier.
Note: Control of the right headphone amplifier can be overridden by HPMODE.
Right DAC Enable
Enabling the right DAC must be done in the same I2C write operation that enables the left DAC. Right
DAC operation requires DALEN = 1.
Left ADC Enable
Right ADC Enable
Enabling the right ADC must be done in the same I2C write operation that enables the left ADC. The right
ADC can be enabled while the left ADC is running if used for DC measurements. SHDN must be toggled
to disable the right ADC in this case. Right ADC operation requires ADLEN = 1.
Revision Code
The MAX9867 includes a revision code to allow easy
identification of the device revision. The revision code is
0x42. See Table 18 for the revision code register.
Table 18. Revision Code Register
REGISTER
Revision
B7
B6
B5
B4
B3
REV
B2
B1
B0
REGISTER
ADDRESS
0xFF
______________________________________________________________________________________
45
MAX9867
required circuitry is active. Toggle the SHDN bit whenever a configuration change is made. Table 17 is the
power-management register.
Power Management
The MAX9867 includes complete power management
control to minimize power usage. The DAC and both
ADC can be independently enabled so that only the
MAX9867
Ultra-Low Power Stereo Audio Codec
I2C Serial Interface
required on SCL if there are multiple masters on the bus,
or if the single master has an open-drain SCL output.
Series resistors in line with SDA and SCL are optional.
Series resistors protect the digital inputs of the
MAX9867 from high-voltage spikes on the bus lines, and
minimize crosstalk, and undershoot of the bus signals.
The MAX9867 features an I 2 C/SMBus-compatible,
2-wire serial interface consisting of a serial-data line
(SDA) and a serial-clock line (SCL). SDA and SCL facilitate communication between the MAX9867 and the master at clock rates up to 400kHz. Figure 9 shows the
2-wire interface timing diagram. The master generates
SCL and initiates data transfer on the bus. The master
device writes data to the MAX9867 by transmitting the
proper slave address followed by the register address
and then the data word. Each transmit sequence is
framed by a START (S) or REPEATED START (Sr) condition and a STOP (P) condition. Each word transmitted to
the MAX9867 is 8 bits long and is followed by an
acknowledge clock pulse. A master reading data from
the MAX9867 transmits the proper slave address
followed by a series of nine SCL pulses. The MAX9867
transmits data on SDA in sync with the master-generated
SCL pulses. The master acknowledges receipt of each
byte of data. Each read sequence is framed by a START
or REPEATED START condition, a not acknowledge, and
a STOP condition. SDA operates as both an input and an
open-drain output. A pullup resistor, typically greater
than 500Ω is required on SDA. SCL operates only as an
input. A pullup resistor, typically greater than 500Ω, is
Bit Transfer
One data bit is transferred during each SCL cycle. The
data on SDA must remain stable during the high period
of the SCL pulse. Changes in SDA while SCL is high
are control signals. See the START and STOP
Conditions section.
START and STOP Conditions
SDA and SCL idle high when the bus is not in use. A
master initiates communication by issuing a START condition. A START condition is a high-to-low transition on
SDA with SCL high. A STOP condition is a low-to-high
transition on SDA while SCL is high (Figure 10). A START
condition from the master signals the beginning of a
transmission to the MAX9867. The master terminates
transmission, and frees the bus, by issuing a STOP condition. The bus remains active if a REPEATED START
condition is generated instead of a STOP condition.
SDA
tSU, STA
tSU, DAT
tLOW
tBUF
tHD, STA
tSP
tHD, DAT
tSU, STO
tHIGH
SCL
tHD, STA
tR
tF
START CONDITION
REPEATED START CONDITION
STOP
CONDITION
Figure 9. 2-Wire Interface Timing Diagram
S
Sr
P
SCL
SDA
Figure 10. START, STOP, and REPEATED START Conditions
46
______________________________________________________________________________________
START
CONDITION
Ultra-Low Power Stereo Audio Codec
Slave Address
The slave address is defined as the 7 most significant
bits (MSBs) followed by the read/write bit. For the
MAX9867, the 7 most significant bits are 0011000.
Setting the read/write bit to 1 (slave address = 0x31)
configures the MAX9867 for read mode. Setting the
read/write bit to 0 (slave address = 0x30) configures
the MAX9867 for write mode. The address is the first
byte of information sent to the MAX9867 after the
START condition.
Acknowledge
The acknowledge bit (ACK) is a clocked 9th bit that the
MAX9867 uses to handshake receipt each byte of data
when in write mode (see Figure 11). The MAX9867 pulls
down SDA during the entire master-generated 9th clock
pulse if the previous byte is successfully received.
Monitoring ACK allows for detection of unsuccessful
data transfers. An unsuccessful data transfer occurs if
a receiving device is busy or if a system fault has
occurred. In the event of an unsuccessful data transfer,
the bus master retries communication. The master pulls
down SDA during the 9th clock cycle to acknowledge
receipt of data when the MAX9867 is in read mode. An
acknowledge is sent by the master after each read byte
to allow data transfer to continue. A not acknowledge is
sent when the master reads the final byte of data from
the MAX9867, followed by a STOP condition.
Write Data Format
A write to the MAX9867 includes transmission of a
START condition, the slave address with the R/W bit set
to 0, 1 byte of data to configure the internal register
address pointer, 1 or more bytes of data, and a STOP
condition. Figure 12 illustrates the proper frame format
for writing 1 byte of data to the MAX9867. Figure 13
illustrates the frame format for writing n bytes of data to
the MAX9867.
CLOCK PULSE FOR
ACKNOWLEDGMENT
START
CONDITION
SCL
1
2
9
NOT ACKNOWLEDGE
SDA
ACKNOWLEDGE
Figure 11. Acknowledge
ACKNOWLEDGE FROM MAX9867
B7
ACKNOWLEDGE FROM MAX9867
S
SLAVE ADDRESS
0
B6
B5
B4
B3
B2
B1
B0
ACKNOWLEDGE FROM MAX9867
A
R/W
REGISTER ADDRESS
A
DATA BYTE
A
P
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
Figure 12. Writing 1 Byte of Data to the MAX9867
______________________________________________________________________________________
47
MAX9867
Early STOP Conditions
The MAX9867 recognizes a STOP condition at any
point during data transmission except if the STOP condition occurs in the same high pulse as a START condition. For proper operation, do not send a STOP
condition during the same SCL high pulse as the
START condition.
MAX9867
Ultra-Low Power Stereo Audio Codec
The first byte transmitted from the MAX9867 is the content of register 0x00. Transmitted data is valid on the
rising edge of SCL. The address pointer autoincrements after each read data byte. This autoincrement
feature allows all registers to be read sequentially within
one continuous frame. A STOP condition can be issued
after any number of read data bytes. If a STOP condition is issued followed by another read operation, the
first data byte to be read is from register 0x00.
The slave address with the R/W bit set to 0 indicates
that the master intends to write data to the MAX9867.
The MAX9867 acknowledges receipt of the address
byte during the master-generated 9th SCL pulse.
The second byte transmitted from the master configures the MAX9867’s internal register address pointer.
The pointer tells the MAX9867 where to write the next
byte of data. An acknowledge pulse is sent by the
MAX9867 upon receipt of the address pointer data.
The third byte sent to the MAX9867 contains the data
that is written to the chosen register. An acknowledge
pulse from the MAX9867 signals receipt of the data byte.
The address pointer autoincrements to the next register
address after each received data byte. This autoincrement feature allows a master to write to sequential registers within one continuous frame. Figure 13 illustrates
how to write to multiple registers with one frame. The
master signals the end of transmission by issuing a
STOP condition. Register addresses greater than 0x17
are reserved. Do not write to these addresses.
The address pointer can be preset to a specific register
before a read command is issued. The master presets
the address pointer by first sending the MAX9867’s
slave address with the R/W bit set to 0 followed by the
register address. A REPEATED START condition is then
sent followed by the slave address with the R/W bit set
to 1. The MAX9867 then transmits the contents of the
specified register. The address pointer autoincrements
after transmitting the first byte.
The master acknowledges receipt of each read byte
during the acknowledge clock pulse. The master must
acknowledge all correctly received bytes except the
last byte. The final byte must be followed by a not
acknowledge from the master and then a STOP condition. Figure 14 illustrates the frame format for reading 1
byte from the MAX9867. Figure 15 illustrates the frame
format for reading multiple bytes from the MAX9867.
Read Data Format
Send the slave address with the R/W bit set to 1 to initiate a read operation. The MAX9867 acknowledges
receipt of its slave address by pulling SDA low during
the 9th SCL clock pulse. A START command followed
by a read command resets the address pointer to register 0x00.
ACKNOWLEDGE FROM MAX9867
ACKNOWLEDGE FROM MAX9867
S
SLAVE ADDRESS
B7 B6 B5 B4 B3 B2 B1 B0
B7 B6 B5 B4 B3 B2 B1 B0
ACKNOWLEDGE FROM MAX9867
ACKNOWLEDGE FROM MAX9867
0
A
REGISTER ADDRESS
A
A
DATA BYTE 1
R/W
DATA BYTE n
1 BYTE
A
P
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
Figure 13. Writing n Bytes of Data to the MAX9867
NOT ACKNOWLEDGE FROM MASTER
ACKNOWLEDGE FROM MAX9867
S
SLAVE ADDRESS
0
R/W
ACKNOWLEDGE FROM MAX9867
A
REGISTER ADDRESS
ACKNOWLEDGE FROM MAX9867
A
REPEATED START
Sr
SLAVE ADDRESS
1
R/W
A
DATA BYTE
A
P
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
Figure 14. Reading 1 Byte of Data from the MAX9867
48
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
S
SLAVE ADDRESS
0
R/W
ACKNOWLEDGE FROM MAX9867
A
REGISTER ADDRESS
ACKNOWLEDGE FROM MAX9867
A
Sr
REPEATED START
SLAVE ADDRESS
1
R/W
A
DATA BYTE
A
P
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
Figure 15. Reading n Bytes of Data from the MAX9867
Applications Information
Proper layout and grounding are essential for optimum
performance. When designing a PCB for the MAX9867,
partition the circuitry so that the analog sections of the
MAX9867 are separated from the digital sections. This
ensures that the analog audio traces are not routed
near digital traces.
Use a large continuous ground plane on a dedicated
layer of the PCB to minimize loop areas. Connect
AGND and DGND directly to the ground plane using
the shortest trace length possible. Proper grounding
improves audio performance, minimizes crosstalk
between channels, and prevents any digital noise from
coupling into the analog audio signals.
Ground the bypass capacitors on MICBIAS, REG,
PREG, and REF directly to the ground plane with minimum trace length. Also be sure to minimize the path
length to AGND. Bypass AVDD directly to AGND.
Connect all digital I/O termination to the ground plane
with minimum path length to DGND. Bypass DVDD and
DVDDIO directly to DGND.
Route microphone signals from the microphone to the
MAX9867 as a differential pair, ensuring that the positive and negative signals follow the same path as closely as possible with equal trace length. When using
single-ended microphones or other single-ended audio
sources, ground the negative microphone input as near
as possible to the audio source and then treat the positive and negative traces as differential pairs.
The MAX9867 TQFN package features an exposed
thermal pad on its underside. Connect the exposed
thermal pad to AGND.
An evaluation kit (EV Kit) is available to provide an
example layout for the MAX9867. The EV kit allows
quick setup of the MAX9867 and includes easy-to-use
software, allowing all internal registers to be controlled.
______________________________________________________________________________________
49
MAX9867
ACKNOWLEDGE FROM MAX9867
Ultra-Low Power Stereo Audio Codec
1.7V–3.6V
1.8V
TO PROCESSOR
SYSTEM
CLOCK
1µF
1µF
REF
8
(B5)
REG
10
(B6)
MICBIAS
4
(C3)
3
(A3)
2
(B3)
31
(B2)
30
(B1)
29
(C1)
28
(C2)
27
(D1)
IRQ
SDA
SCL
MCLK
BCLK
LRCLK
SDIN
SDOUT
32
(A1)
1µF
DVDD
1µF
7
(A5)
5
(A4)
23
(E2)
PREG
AVDD
I2C
VCM
PREG
CLOCK
GEN
DIGITAL AUDIO
INTERFACE
LINEAR
REG
DSTS
2.2kΩ
DVST:
0dB TO -60dB
11
0.22µF (C5)
MICLP/
DIGMICDATA
PALEN:
0/20/30dB
PGAML:
+20dB TO 0dB
AVL:
+3dB TO -12dB
MXINL
MICLN/
DIGMICCLK
ADCL
MAX9867
DACG:
0/6/12/18dB
DIGITAL
FILTERING
DACA:
0dB TO -15dB
VOLL:
+6dB TO -84dB
DIGITAL
FILTERING
MIX
0.22µF 12
(C6)
MIX
2.2kΩ
PVDD
REF
MIX
1µF
DVDDIO
6
(B4)
1.8V
1µF
1µF
26
(E1)
2.2µF
1.8V
TO PROCESSOR
LOUTP
DACL
LOUTN
DMONO
DACG:
0/6/12/18dB
DACA:
0dB TO -15dB
VOLR:
+6dB TO -84dB
ROUTP
2.2kΩ
0.22µF
13
(C4)
14
0.22µF (D6)
0.47µF
0.47µF
MICRP
PGAMR:
+20dB TO 0dB
AVR:
+3dB TO -12dB
MXINR
MICRN
ADCR
LINL
16
(E6)
LINR
VOLL, LVOLFIX:
+6dB TO -84dB
JACK
DETECT
LIGR:
+24dB TO -6dB
VOLR, LVOLFIX:
+6dB TO -84dB
DGND
1
(A2)
AGND
9
(A6)
() WLP PACKAGE
50
19
(D3)
ROUTN
20
(E4)
JACKSNS/
AUX
17
(D4)
DIGITAL
FILTERING
LIGL:
+24dB TO -6dB
15
(D5)
DACR
21
(D2)
MIX
PAREN:
0/20/30dB
MIX
2.2kΩ
DIGITAL
FILTERING
22
(E3)
MIX
MAX9867
Functional Diagram/Typical Operating Circuit
______________________________________________________________________________________
PGND
18
(E5)
Ultra-Low Power Stereo Audio Codec
PVDD
LOUTN
ROUTN
ROUTP
PGND
JACKSNS/AUX
24
LOUTP
N.C.
TOP VIEW
23
22
21
20
19
18
17
TOP VIEW
(BUMP SIDE DOWN)
16
N.C. 25
LINR
MAX9867
1
2
3
4
5
6
DVDD
DGND
SDA
AVDD
PREG
AGND
BCLK
MCLK
SCL
REF
REG
MICBIAS
LRCLK
SDIN
IRQ
MICRP
MICLN
MICLP
SDOUT
LOUTN
ROUTP
JACKSNS
LINL
MICRN
DVDDIO
PVDD
LOUTP
ROUTN
PGND
LINR
A
DVDDIO 26
15
LINL
SDOUT 27
14
MICRN
SDIN 28
MAX9867
LRCLK 29
BCLK 30
MCLK 31
*EP
+
1
2
3
4
5
6
7
8
DGND
SCL
SDA
IRQ
AVDD
REF
PREG
REG
DVDD 32
THIN QFN
(5mm × 5mm)
*EP = EXPOSED PAD
13
MICRP
12
MICLP/DIGMICDATA
11
MICLN/DIGMICCLK
10
MICBIAS
9
AGND
B
C
D
E
WLP
(2.2mm x 2.7mm)
______________________________________________________________________________________
51
MAX9867
Pin Configurations
MAX9867
Ultra-Low Power Stereo Audio Codec
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
52
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
30 WLP
W302A2+3
21-0211
—
32 TQFN-EP
T3255+4
21-0140
90-0121
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
QFN THIN.EPS
______________________________________________________________________________________
53
MAX9867
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
MAX9867
Ultra-Low Power Stereo Audio Codec
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the
package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
54
______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
4/09
Initial release
1
5/10
Added lead temperature and soldering temperatures, updated VOS
specification
2, 8
2
6/10
Corrected error in TOC20
15
DESCRIPTION
—
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 55
© 2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX9867
Revision History