MAX4910/MAX4911/MAX4912 Quad-SPDT, Clickless Audio Switches with Negative Signal Handling General Description

19-3854; Rev 0; 2/06
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
Features
The MAX4910/MAX4911/MAX4912 quad, singlepole/double-throw (SPDT), clickless audio switches feature negative signal capability that allows signals as low
as VCC-5.5V to pass through without distortion. These
analog switches have a low on-resistance, low supply
current, and operate from a single +1.8V to +5.5V supply.
The MAX4910/MAX4911/MAX4912 have internal shunt
resistors that automatically discharge the capacitance at
the normally open (NO) and normally closed (NC) terminals when they are not connected. The MAX4910/
MAX4911 have shunt resistors on all NO and NC terminals
and the MAX4912 has shunt resistors on all NO, NC1, and
NC3 terminals. These shunt resistors reduce click-andpop sounds that occur when switching audio signals
between precharged points. A break-before-make feature
further reduces popping.
♦ Distortion-Free Negative Signal Throughput Down
to VCC - 5.5V
The MAX4910/MAX4912 control the switches in pairs with
two control bits CB1 and CB2. The MAX4911 has one control bit to switch all four switches and an enable pin EN to
put the switches in a high-impedance mode. The MAX4912
has two terminals without shunt resistors for switching
applications that do not require pre-discharge switching.
The MAX4910/MAX4911/MAX4912 are available in a tiny
16-pin TQFN-EP (3mm x 3mm) package and operate
over the -40°C to +85°C extended temperature range.
Applications
Cell Phones
♦ Internal Shunt Resistors Reduce Click-and-Pop
Sounds
♦ High PSRR Reduces Supply Noise
♦ Low On-Resistance (0.37Ω)
♦ 0.1Ω Channel-to-Channel Matching
♦ 0.35Ω On-Resistance Flatness
♦ +1.8V to +5.5V Single-Supply Voltage
♦ -80dB Crosstalk (20kHz)
♦ -90dB Off-Isolation (20kHz)
♦ 0.05% Total Harmonic Distortion
♦ Enable Control (MAX4911)
♦ 10nA Leakage Current
♦ 150nA Supply Current
Ordering Information
PART
TEMP RANGE
MAX4910ETE+
PINPACKAGE
TOP
PKG
MARK CODE
-40°C to +85°C 16 TQFN-EP**
ADY
T1633-4
MAX4911ETE+* -40°C to +85°C 16 TQFN-EP**
ADZ
T1633-4
MAX4912ETE+* -40°C to +85°C 16 TQFN-EP**
AEA
T1633-4
+ Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed pad.
PDAs and Handheld Devices
Notebook Computers
Typical Operating Circuit appears at end of data sheet.
MP3 Players
Pin Configurations
TOP VIEW
COM4 NO4
12
11
CB2
NC3
10
9
COM4 NO4
12
11
EN
NC3
10
9
NC4 13
8
COM3
NC4 13
8
COM3
VCC 14
7
NO3
VCC 14
7
NO3
6
GND
NO1 15
6
GND
5
NC2
COM1 16
5
NC2
MAX4910
MAX4912
NO1 15
COM1 16
+
1
2
NC1
CB1
3
4
NO2 COM2
THIN QFN
3 mm x 3 mm
MAX4911
+
1
2
NC1
CB
3
4
NO2 COM2
THIN QFN
3 mm x 3 mm
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX4910/MAX4911/MAX4912
General Description
MAX4910/MAX4911/MAX4912
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
VCC, CB_, EN ........................................................-0.3V to +6.0V
COM_, NC_, NO_ ...............................(VCC - 6V) to (VCC + 0.3V)
Continuous Current NO_, NC_, COM_ ...........................±300mA
Peak Current NO_, NC_, COM_ (pulsed at 1ms,
50% duty cycle)..........................................................±400mA
Peak Current NO_, NC_, COM_ (pulsed at 1ms,
10% duty cycle)..........................................................±500mA
Continuous Power Dissipation (TA = +70°C)
16-Pin TQFN, Single-Layer Board
(derate 15.6mW/°C above +70°C) .............................1250mW
16-Pin TQFN, Multilayer Board
(derate 20.8mW/°C above +70°C) .............................1667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C, EN = low (MAX4911 only), unless otherwise noted. Typical values are at VCC = +3.0V, TA =
+25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5.5
V
POWER SUPPLY
Supply Voltage
VCC
1.8
VCC = +5.5V, VCB_ = VEN = 0V or VCC
Supply Current
ICC
0.15
2
VCC = +2.7V, VCB_ = VEN = +0.5V or +1.4V
4
VCC = +5.5V, VCB_ = VEN = +0.5V or +1.4V
8
µA
ANALOG SWITCH
Analog Signal Range
On-Resistance
(Note 3)
On-Resistance Match
Between Channels
(Notes 3, 4)
On-Resistance Flatness
(Note 5)
Shunt Switch Resistance
2
VNC_,
VNO_,
VCOM_,
VCC 5.5V
(Note 2)
Channels 1 and 3, VCC =
+3.3V, VNC_ or VNO_ = VCC 5.5V, -1V, 0V, +1V, +2V, VCC,
ICOM1 = ICOM3 = 100mA
TA = +25°C
Channels 2 and 4, VCC =
+3.3V, VNC_ or VNO_ = VCC 5.5V, -1V, 0V, +1V, +2V, VCC,
ICOM2 = ICOM4 = 100mA
TA = +25°C
VCC
0.37
V
0.75
Ω
TA = TMIN to TMAX
0.8
RON
∆RON
RFLAT
RSH
0.72
1.45
Ω
TA = TMIN to TMAX
1.6
Channels 1 and 3, VCC = +3.3V, VNC_ or VNO_ = 0,
ICOM_ = 100mA
0.1
Channels 2 and 4, VCC = +3.3V, VNC_ or VNO_ = 0,
ICOM_ = 100mA
0.1
Channels 1 and 3, VCC = +3.3V, VNC_ = VNO_ =
VCC - 5.5V, -1V, 0V, +1V, +2V, VCC, ICOM_ = 100mA
0.35
Channels 2 and 4, VCC = +3.3V, VNC_ = VNO_ =
VCC - 5.5V, -1V, 0V, +1V, +2V, VCC, ICOM_ = 100mA
0.6
Ω
Ω
2
3.8
_______________________________________________________________________________________
6
kΩ
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C, EN = low (MAX4911 only), unless otherwise noted. Typical values are at VCC = +3.0V, TA =
+25°C.) (Note 1)
PARAMETER
NC_ Off-Leakage Current
COM_ On-Leakage Current
SYMBOL
INC_(OFF)
ICOM_(ON)
CONDITIONS
MAX4912 (NC2 and NC4)
only: VCC = +2.7V, switch
open, VNC_ = -2.5V or
+2.5V, VCOM_ = +2.5V or
-2.5V
TA = +25°C
MIN
TYP
-10
MAX
UNITS
+10
nA
TA = TMIN to TMAX
-50
+50
VCC = +2.7V, switch closed; T = +25°C
A
VNC_ or VNO_ = -2.5V,
+2.5V, or floating; VCOM_ =
TA = TMIN to TMAX
-2.5V, +2.5V, or floating
-10
+10
-100
+100
nA
DYNAMIC CHARACTERISTICS
Turn-On Time
tON
VCC = +2.7V, CB_ = low to high, RL = 50Ω,
CL = 5pF, VNO_ = +1.5V, Figure 2
0.055
0.15
µs
Turn-Off Time
tOFF
VCC = +2.7V, CB_ = high to low, RL = 50Ω,
CL = 5pF, VNO_ = +1.5V, Figure 2
0.3
1.0
µs
Break-Before-Make Delay
Time
tD
VCC = +2.7V, CB_ = low to high or high to low,
RL = 50Ω, CL = 5pF, VNC_ = VNO_ = +1.5V, Figure 3
Charge Injection
Q
25
ns
VGEN_= 0, RGEN = 0, CL = 1nF, Figure 4
300
pC
PSRR
f = 20kHz, VCOM_ = 1VRMS, RL = 50Ω, CL = 5pF
60
dB
Off-Isolation
VISO
f = 20kHz, VCOM_ = 1VRMS, RL = 50Ω, Figure 5
(Note 6)
-90
dB
Crosstalk
VCT
f = 20kHz, VCOM_ = 1VRMS, RL = 50Ω, Figure 5
-80
dB
THD
f = 20Hz to 20kHz, VCOM_ = 0.5VP-P, RL = 50Ω,
DC bias = 0
0.05
%
Power-Supply Rejection Ratio
Total Harmonic Distortion
1
NO_, NC_ Off-Capacitance
CNO_(OFF) f = 1MHz, VCOM_ = 0.5VP-P, DC bias = 0, Figure 6
100
pF
COM On-Capacitance
CCOM_(ON) f = 1MHz, VCOM_ = 0.5VP-P, DC bias = 0, Figure 6
200
pF
DIGITAL INPUTS (CB_, EN)
Input Logic High
VIH
Input Logic Low
VIL
Input Leakage Current
ICB, IEN
1.4
VCB_ = VEN = 0V or VCC
-1
V
0.5
V
+1
µA
Note 1: All parameters are production tested at TA = +85°C and guaranteed by design over the specified temperature range.
Note 2: Signals on COM_, NO_, or NC_ exceeding VCC are clamped by internal diodes. Limit forward-diode current to maximum current
rating.
Note 3: Guaranteed by design; not production tested.
Note 4: ∆RON = RON(MAX) - RON(MIN).
Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified
analog signal ranges.
Note 6: Off-isolation = 20log10 [VCOM_/ VNO_], VCOM_ = output, VNO_ = input to off switch.
_______________________________________________________________________________________
3
MAX4910/MAX4911/MAX4912
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
CHANNEL 2/4 ON-RESISTANCE
vs. COM 2/4 VOLTAGE
2.0
VCC = 2.0V
1.5
VCC = 2.5V
1.0
VCC = 2.3V
VCC = 3.0V
4.0
3.5
3.0
VCC = 2.0V
2.5
VCC = 2.5V
2.0
VCC = 2.3V
VCC = 3.0V
1.5
1.0
0.8
VCC = 5.0V
1.0
VCC = 5.0V
0.5
VCC = 1.8V
MAX4910/11/12 toc03
4.5
MAX4910/11/12 toc02
5.0
ON-RESISTANCE (Ω)
VCC = 1.8V
2.5
ON-RESISTANCE (Ω)
MAX4910/11/12 toc01
3.0
CHANNEL 1/3 ON-RESISTANCE
vs. COM 1/3 VOLTAGE
ON-RESISTANCE (Ω)
CHANNEL 1/3 ON-RESISTANCE
vs. COM 1/3 VOLTAGE
0.6
TA = +85°C
0.4
0.2
TA = +25°C
TA = -40°C
0.5
0
0
-3
-2
-1
0
1
2
3
4
0
-4
5
-3
-2
-1
0
1
2
3
4
5
-3
-2
-1
0
1
2
COM VOLTAGE (V)
COM VOLTAGE (V)
CHANNEL 2/4 ON-RESISTANCE
vs. COM 2/4 VOLTAGE
CHANNEL 1/3 ON-RESISTANCE
vs. COM 1/3 VOLTAGE
CHANNEL 2/4 ON-RESISTANCE
vs. COM 2/4 VOLTAGE
0.8
TA = +25°C
0.6
0.4
VCC = 5.0V
TA = -40°C
0.6
TA = +85°C
0.4
0.2
0.8
ON-RESISTANCE (Ω)
TA = +85°C
0.8
MAX4910/11/12 toc05
1.0
MAX4910/11/12 toc04
1.2
TA = +85°C
TA = +25°C
0.4
TA = -40°C
0.2
TA = +25°C
0.2
VCC = 5.0V
0.6
3
MAX4910/11/12 toc06
COM VOLTAGE (V)
ON-RESISTANCE (Ω)
-4
ON-RESISTANCE (Ω)
TA = -40°C
0
0
-3
-2
-1
0
1
2
0
-1
3
0
COM VOLTAGE (V)
1
2
3
4
5
-1
0
COM VOLTAGE (V)
160
140
120
100
80
60
40
450
400
NC TURN-ON TIME
350
300
250
NO TURN-OFF TIME
20
0
1.8
2.3
2.8
3.3
3.8
4.3
SUPPLY VOLTAGE (V)
4
4.8
5.3
3
MAX4910/11/12 toc08
180
2
NC TURN-ON / NO TURN-OFF TIME
vs. SUPPLY VOLTAGE
TURN-ON/TURN-OFF TIME (ns)
MAX4910/11/12 toc07
200
1
COM VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT (nA)
MAX4910/MAX4911/MAX4912
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
200
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
4
5
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
NO TURN-ON/NC TURN-OFF TIME
vs. SUPPLY VOLTAGE
NO TURN-ON/NC TURN-OFF TIME
vs. TEMPERATURE
80
NO TURN-ON TIME
70
60
50
40
30
20
100
NO TURN-ON TIME
90
80
70
60
50
NC TURN-OFF TIME
40
30
20
10
NC TURN-OFF TIME
10
0
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
-40 -25 -10
5
SUPPLY VOLTAGE (V)
50
65
80
NC TURN-ON TIME
330
320
310
300
MAX4910/11/12 toc12
350
2.0
1.6
LOGIC THRESHOLD (V)
MAX4910/11/12 toc11
360
TURN-ON/TURN-OFF TIME (ns)
35
LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
370
VCB RISING
1.2
0.8
VCB FALLING
0.4
NO TURN-OFF TIME
290
20
TEMPERATURE (°C)
NC TURN-ON/NO TURN-OFF TIME
vs. TEMPERATURE
340
MAX4910/11/12 toc10
TURN-ON/TURN-OFF TIME (ns)
90
TURN-ON/TURN-OFF TIME (ns)
MAX4910/11/12 toc09
100
280
0
270
-40 -25 -10
20
35
50
65
1.8
80
2.3
2.8
3.3
3.8
4.3
4.8
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
SUPPLY CURRENT
vs. LOGIC INPUT VOLTAGE
CHARGE INJECTION
vs. COMMON VOLTAGE
1.5
1.0
0.5
5.3
900
MAX4910/11/12 toc14
VCC = +4.3V
700
CHARGE INJECTION (pC)
MAX4910/11/12 toc13
SUPPLY CURRENT (µA)
2.0
5
500
VCC = 5.0V
300
VCC = 2.0V
100
-100
-300
0
0 0.5 1 1.4 2
3
4
DIGITAL INPUT VOLTAGE (V)
5
-3
-2
-1
0
1
2
3
4
5
VCOM (V)
_______________________________________________________________________________________
5
MAX4910/MAX4911/MAX4912
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 3.0V, TA = +25°C, unless otherwise noted.)
LEAKAGE CURRENT
vs. TEMPERATURE
FREQUENCY RESPONSE
3
ON-LOSS (dB)
ICOM(ON)
6
100
ICOM(OFF)
MAX4910/11/12 toc16
1000
MAX4910/11/12 toc15
LEAKAGE CURRENT (pA)
10,000
10
CHANNEL 2/4
0
CHANNEL 1/3
-3
1
-40
-15
10
35
60
-6
85
0.01
0.1
TEMPERATURE (°C)
OFF-ISOLATION vs. FREQUENCY
100
CROSSTALK vs. FREQUENCY
-20
ON-LOSS (dB)
-40
CHANNEL 2/4
-60
CHANNEL 1/3
MAX4910/11/12 toc18
-20
-40
COM 2/4
-60
-80
-80
-100
-100
-120
COM 1/3
-120
0.01
0.1
1
10
100
0.01
0.1
1
10
FREQUENCY (MHz)
FREQUENCY (MHz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
CHANNEL 2/3 POWER SUPPLY
REJECTION RATIO vs. FREQUENCY
100
MAX4910/11/12 toc19
RL = 50Ω
80
PSRR (dB)
THD COM
100
MAX4910/11/12 toc20
ON-LOSS (dB)
10
0
MAX4910/11/12 toc17
0
0.1
1
FREQUENCY (MHz)
THD (%)
MAX4910/MAX4911/MAX4912
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
60
CHANNEL 2/3
40
CHANNEL 1/4
THD COM
20
0.01
0
0.01
0.1
1
FREQUENCY (kHz)
6
10
100
0.01
0.1
1
10
100
FREQUENCY (MHz)
_______________________________________________________________________________________
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
PIN
MAX4910/
MAX4912
MAX4911
NAME
FUNCTION
1
1
NC1
Analog Switch 1—Normally Closed Terminal
2
—
CB1
Digital Control Input for Analog Switch 1 and Analog Switch 3
—
2
CB
Digital Control Input for All Analog Switches
3
3
NO2
Analog Switch 2—Normally Open Terminal
4
4
COM2
5
5
NC2
Analog Switch 2—Normally Closed Terminal
6
6
GND
Ground
7
7
NO3
Analog Switch 3—Normally Open Terminal
8
8
COM3
9
9
NC3
10
—
CB2
Analog Switch 2—Common Terminal
Analog Switch 3—Common Terminal
Analog Switch 3—Normally Closed Terminal
Digital Control Input for Analog Switch 2 and Analog Switch 4.
Enable Input. Driving EN high causes all switches to be high impedance. Pull EN low for
normal operation.
—
10
EN
11
11
NO4
12
12
COM4
13
13
NC4
Analog Switch 4—Normally Closed Terminal
14
14
VCC
Positive Supply Voltage Input
15
15
NO1
Analog Switch 1—Normally Open Terminal
16
16
COM1
—
—
EP
Analog Switch 4—Normally Open Terminal
Analog Switch 4—Common Terminal
Analog Switch 1—Common Terminal
Exposed Pad. Connect to Ground
Detailed Description
The MAX4910/MAX4911/MAX4912 quad SPDT audio
switches are low on-resistance, low supply current,
high power-supply rejection ratio (PSRR) devices that
operate from a +1.8V to +5.5V single supply. These
devices feature a negative signal capability that allows
signals below GND to pass through without distortion
and break-before-make switching.
The MAX4910/MAX4912 have two digital control inputs
CB1 and CB2 where each bit controls a pair of switches (see Table 1). The MAX4911 has an active-low
enable EN and a digital control bit CB. Driving EN low
takes the switches out of high impedance and CB controls all four switches (see Table 2). The MAX4910/
MAX4911 have shunt resistors on all their NO and NC
terminals to suppress click-and-pop sounds that may
occur from switching to a precharged terminal. The
MAX4912 does not have click-and-pop suppression
resistors on NC2 and NC4 for applications that do not
require predischarge switching.
Table 1. MAX4910/MAX4912 Truth Tables
CB1
NC1
NO1
NC3
NO3
0
On
Off
On
Off
1
Off
On
Off
On
CB2
NC2
NO2
NC4
NO4
0
On
Off
On
Off
1
Off
On
Off
On
Table 2. MAX4911 Truth Table
EN
CB
1
0
0
NC_
NO_
X
Off
Off
1
Off
On
0
On
Off
X = Don’t care.
_______________________________________________________________________________________
7
MAX4910/MAX4911/MAX4912
Pin Description
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
MAX4910/MAX4911/MAX4912
Functional Diagrams
MAX4910
MAX4911
V CC
NO1
MAX4912
V CC
NO1
COM1
COM1
COM1
NC1
NC1
NC1
NO3
NO3
NO3
COM3
NC3
COM3
COM3
NC3
NC3
CB1
CB
CONTROL
LOGIC
CB1
CONTROL
LOGIC
CONTROL
LOGIC
EN
CB2
NC2
NC2
CB2
NC2
COM2
COM2
COM2
NO2
NO2
NO2
NC4
NC4
NC4
COM4
COM4
NO4
NO4
COM4
NO4
GND
CB1 = 0, CB2 = 0.
V CC
NO1
GND
EN = 0, CB = 0.
GND
CB1 = 0, CB2 = 0.
DISCHARGE PATHS HAVE A 3.8kΩ RESISTOR (NOT SHOWN).
Applications Information
Digital Control Inputs
The MAX4910/MAX4911/MAX4912 logic inputs accept
up to +5.5V, regardless of supply voltage. For example,
with a +3.3V supply, CB1, CB2, CB, and EN can be dri8
ven low to GND and high to +5.5V, allowing for mixed
logic levels in a system. Driving CB, CB1, CB2, and EN
rail-to-rail minimizes power consumption. For a +3.3V
supply voltage, the logic thresholds are +0.5V (low)
and +1.4V (high).
_______________________________________________________________________________________
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
NC1
V CC
COM1
AMP
NO1
SPEAKER 8Ω
NC3
VOICE
COM3
NO3
CODEC
DISCHARGE
CONTROL/
SIGNAL CONTROL
CB1 (CB)
CB2 (EN)
NC2
COM2
MP3
NO2
CODEC
NC4
COM4
NO4
MAX4910
MAX4911
MAX4912
GND
( ) IS FOR MAX4911 ONLY
Figure 1. Typical Application Circuit
Analog Signal Levels
The MAX4910/MAX4911/MAX4912 on-resistance is
channel dependant. Channels 1 and 3 have an onresistance of 0.37Ω (typ), and channels 2 and 4 have
an on-resistance of 0.72Ω (typ). The on-resistance flatness is guaranteed over temperature and shows minimal variation over the entire voltage supply range (see
the Typical Operating Characteristics). The on-resistance flatness and low-leakage features make it ideal
for bidirectional operation. The switches are bidirectional, so the NO_, NC_, and COM_ pins can be either
inputs or outputs.
These devices pass signals as low as V CC - 5.5V,
including signals below ground with minimal distortion.
Click-and-Pop Suppression
The MAX4910/MAX4911 have a 3.8kΩ (typ) shunt resistor on all their NO and NC terminals to automatically
discharge any capacitance when they are not connected to COM. The MAX4912 has shunt resistors on all
NO, NC1, and NC3 terminals. The shunt resistors
reduce audible click-and-pop sounds that occur when
switching between audio sources.
Audible clicks and pops are caused when a step DC
voltage is switched into the speaker. The DC step tran-
sients can be reduced by automatically discharging the
side that is not connected to the COM terminal, reducing
any residual DC voltage and reducing clicks and pops.
Break-Before-Make Switching
The MAX4910/MAX4911/MAX4912 feature breakbefore-make switching, which is configured to break
(open) the first set of contacts before engaging (closing) the new contacts. This prevents the momentary
connection of the old and new signal paths to the output, reducing click-and-pop sounds.
Power-Supply Sequencing and
Overvoltage Protection
Caution: Do not exceed the Absolute Maximum
Ratings since stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all CMOS devices. Improper supply sequencing can
force the switch into latchup causing it to draw excessive supply current. The only way out of latchup is to
recycle the power and properly reapply it. Connect all
ground pins first, then apply power to VCC, and finally
apply signals to NO_, NC_, and COM_. Follow the
reverse order upon power-down.
_______________________________________________________________________________________
9
MAX4910/MAX4911/MAX4912
1.8V TO 5.5V
MELODY IC
MAX4910/MAX4911/MAX4912
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
Test Circuits/Timing Diagrams
MAX4910
MAX4911
MAX4912
VCC
V CC
COM_
NO_
OR NC_
VNO_
LOGIC
INPUT
50%
0V
VOUT
RL
t OFF
CL
CB_
VOUT
GND
LOGIC
INPUT
t r < 5ns
t f < 5ns
VCC
SWITCH
OUTPUT
0.8 x V0UT
0.8 x VOUT
0V
t ON
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
CB DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 2. Switching Time
V CC
MAX4910
MAX4911
MAX4912
LOGIC
INPUT
V CC
VOUT
COM_
NO_
RL
CL
CB_
LOGIC
INPUT
50%
0V
NC_
VN_
VCC
GND
0.8 x VOUT
VOUT
tBBM
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 3. Break-Before-Make Interval
V CC
MAX4910
MAX4911
MAX4912
∆VOUT
VCC
RGEN
V GEN
VOUT
COM_
NC_
OR NO_
VOUT
CB_
OFF
CL
GND
ON
OFF
CB_
VIL TO VIH
CB_
OFF
ON
OFF
Q = (∆V OUT )(C L )
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 4. Charge Injection
10
______________________________________________________________________________________
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
+5V 10nF
V
OFF-ISOLATION = 20log OUT
VIN
NETWORK
ANALYZER
VCC
0V OR VCC
NC_
MAX4910
MAX4911
MAX4912
VOUT
NO_
GND
50Ω
50Ω
VIN
COM_
CB_
50Ω
MEAS
50Ω
ON-LOSS = 20log
REF
VOUT
VIN
V
CROSSTALK = 20log OUT
VIN
50Ω
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Figure 5. On-Loss, Off-Isolation, and Crosstalk
10nF
V CC
VCC
COM_
MAX4910
MAX4911
MAX4912
CB_
CAPACITANCE
METER
f = 1MHz
VIL OR VIH
NC_ or
NO_
GND
Figure 6. Channel Off-/On-Capacitance
______________________________________________________________________________________
11
MAX4910/MAX4911/MAX4912
Test Circuits/Timing Diagrams (continued)
MAX4910/MAX4911/MAX4912
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
Typical Operating Circuit
1.8V TO 5.5V
MELODY IC
NC1
V CC
COM1
AMP
NO1
SPEAKER 8Ω
NC3
VOICE
COM3
NO3
CODEC
DISCHARGE
CONTROL/
SIGNAL CONTROL
CB1 (CB)
CB2 (EN)
NC2
COM2
NO2
UART
HEADPHONES OR UART
NC4
COM4
NO4
MAX4910
MAX4911
MAX4912
GND
( ) IS FOR MAX4911 ONLY.
Chip Information
PROCESS: BiCMOS
12
______________________________________________________________________________________
Quad-SPDT, Clickless Audio Switches
with Negative Signal Handling
12x16L QFN THIN.EPS
(NE - 1) X e
E
MARKING
E/2
D2/2
(ND - 1) X e
AAAA
D/2
e
CL
D
D2
k
CL
b
0.10 M C A B
E2/2
L
E2
0.10 C
CL
0.08 C
CL
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
G
21-0136
PKG
8L 3x3
12L 3x3
16L 3x3
A
0.70
0.75
0.80
0.70
0.75
b
0.25
0.30 0.35
0.20
D
2.90
3.00
2.90
E
e
2.90 3.00 3.10
0.65 BSC.
2.90 3.00 3.10
0.50 BSC.
2.90 3.00 3.10
0.50 BSC.
L
0.35
0.45
0.30
0.55
3.10
0.75
0.75
0.80
0.25 0.30
0.20 0.25
0.30
3.00
2.90 3.00
3.10
0.55
3.10
0.65
0.70
0.40
N
8
12
16
ND
2
3
4
NE
k
3
2
A1
A2
0
0.02
0.05
0.20 REF
0.25
0
0.50
4
0.02
0.05
0.20 REF
0.25
0
0.02
2
EXPOSED PAD VARIATIONS
REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
0.80
1
0.05
0.20 REF
0.25
PKG.
CODES
E2
D2
PIN ID
JEDEC
DOWN
BONDS
ALLOWED
MIN.
NOM.
MAX.
MIN.
NOM. MAX.
TQ833-1
0.25
0.70
1.25
0.25
0.70
1.25
0.35 x 45°
WEEC
T1233-1
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
NO
T1233-3
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
YES
T1233-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-1
YES
NO
T1633-1
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
NO
T1633-2
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
YES
T1633F-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
N/A
T1633FH-3
0.65
0.80
0.95
0.65
0.80
0.95
0.225 x 45°
WEED-2
N/A
T1633-4
0.95
1.10
1.25
0.95
1.10
1.25
0.35 x 45°
WEED-2
NO
NOTES:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
N IS THE TOTAL NUMBER OF TERMINALS.
THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO
JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED
WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE.
DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
DRAWING CONFORMS TO JEDEC MO220 REVISION C.
MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
G
2
2
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 ____________________ 13
© 2006 Maxim Integrated Products
Boblet
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
MAX4910/MAX4911/MAX4912
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)