BDTIC

S m a r t L E W I S TM R X +
BDTIC
TDA 524 0 Fa mily
Enhanced Sensitivity Multi-Configuration Receiver
Technical Selection Guide
App lication No te
v1.0, 2010-03-24
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BDTIC
Edition 2010-03-24
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Infineon Technologies AG
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TDA5240 Family
Technical Selection Guide
TDA5240 Family Enhanced Sensitivity Multi-Configuration Receiver
Revision History: 2010-03-24, v1.0
Previous Revision: --Page
Subjects (major changes since last revision)
BDTIC
Trademarks of Infineon Technologies AG
BlueMoon™, COMNEON™, C166™, CROSSAVE™, CanPAK™, CIPOS™, CoolMOS™, CoolSET™,
CORECONTROL™, DAVE™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPACK™, EconoPIM™,
EiceDRIVER™, EUPEC™, FCOS™, HITFET™, HybridPACK™, ISOFACE™, I²RF™, IsoPACK™, MIPAQ™,
ModSTACK™, my-d™, NovalithIC™, OmniTune™, OptiMOS™, ORIGA™, PROFET™, PRO-SIL™,
PRIMARION™, PrimePACK™, RASIC™, ReverSave™, SatRIC™, SensoNor™, SIEGET™, SINDRION™,
SMARTi™, SmartLEWIS™, TEMPFET™, thinQ!™, TriCore™, TRENCHSTOP™, X-GOLD™, XMM™, X-PMU™,
XPOSYS™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, PRIMECELL™,
REALVIEW™, THUMB™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR development partnership.
Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™, FirstGPS™ of Trimble Navigation
Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG. FLEXGO™ of Microsoft Corporation.
FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of
Commission Electrotechnique Internationale. IrDA™ of Infrared Data Association Corporation. ISO™ of
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of
Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of NXP.
MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA
MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF
Micro Devices, Inc. SIRIUS™ of Sirius Sattelite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™
of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas
Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes
Zetex Limited.
Last Trademarks Update 2010-03-22
Application Note
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3
v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Table of Contents
Table of Contents
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1
Overview and General Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Different System Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Overall System Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BDTIC
Application Note
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v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
List of Figures
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
General Comparison Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RF/IF System Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Baseband Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output Sources of Digital Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical TDA5225 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Typical TDA5235/40 Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
BDTIC
Application Note
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5
v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Overview and General Comparison
1
Overview and General Comparison
This is a simple technical guideline for selecting the best matching member out of the SmartLEWIS TDA5240
family for your application.
The TDA5240 family consists of 3 chip sets:
•
•
•
TDA5240 is the superset of this family and supports the autonomous receive mode, where the desired payload
is automatically extracted and interrupts can trigger the host microcontroller to read the payload from the FIFO.
TDA5235 has some minor restrictions compared to TDA5240:
• TDA5235 is only capable of two independent configuration sets, while TDA5240 has four independent
configuration sets.
• TDA5235 is able to support only one RF channel within each configuration set, while TDA5240 can
handle up to three RF channels per configuration sets.
TDA5225 does not support the autonomous receive mode:
• Only the transparent receive data is available.
• A decision on valid data and a Clock-Data-Recovery must be applied in the application controller.
• Payload extraction needs to be done in the application controller.
BDTIC
Figure 1
TDA5240
X
TDA5235
X
TDA5225
X
X
5V Pads
IF Filter integrated
Digital Decoding
Frame Sync
NRZ Slicer Output
Manchester Decoding
Multi-Channel
High Sensitivity
A short overview on the available features is shown in the general comparison matrix in Figure 1.
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
General Comparison Matrix
Application Note
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6
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TDA5240 Family
Technical Selection Guide
Overview and General Comparison
Figure 2 is comparing the key features of the RF/IF system.
TDA5225
TDA5235
TDA5240
- 119 dBm
- 119 dBm
Sensitivity
Sensitivity(FSK,
(FSK,
2 kbit/s, fdev = +/- 10
10
kHz,
kHz, BER=2*10
BER=2*10-3)
Sensitivity
Sensitivity(ASK,
(ASK,
-3
)
2 kbit/s,
kbit/s ,BER=2*10
BER=2*10
- 119 dBm
-116 dBm Peak
-116 dBm Peak
-116 dBm Peak
BDTIC
PLL
PLL Type
Type
ΣΔ PLL
ΣΔ PLL
Multi- ChannelResolution
Multi-Channel
Resolution
Fine: 10.5 Hz
Fine: 10.5 Hz
Fine: 10.5 Hz
Receiver
Receiver Type
Type
Single/Double
conversion
Single/Double
conversion
Single/Double
conversion
10.7 MHz
10.7 MHz
10.7 MHz
274 kHz
274 kHz
274 kHz
IF
IF Frequency
Frequency
ChannelBandwidth
Bandwidth
Channel
50 - 300 kHz
50 - 300 kHz
50 - 300 kHz
( on-- chip filter)
( on-- chip filter)
( on-- chip filter)
+ ext. CER filter
Figure 2
ΣΔ PLL
+ ext. CER filter
+ ext. CER filter
RF/IF System Comparison
Application Note
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v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Overview and General Comparison
Detailed differences in the digital baseband processing can be seen in Figure 3.
TDA5225
TDA5235
TDA5240
Max. FSK Data Rate
112 kchip/s
112 kchip/s
112 kchip/s
Max. ASK Data Rate
40 kchip/s
40 kchip/s
40 kchip/s
4
2
4
Number of Configurations
BDTIC
Number of RF channels
3
1
3
●
●
●
(●)
●
●
Manchester Code (ClkRecovery)
●
●
Bi-- phase Code
●
●
●
●
per Configuration
Sliced baseband output
(simple slicer allows NRZ processing
externally)
Digital Slicer in Digital Baseband
simple slicer only
(
(ClkRecovery
)
Frame Synchronization
Unit (TSI)
FIFO size
Self Polling Mode
(●)
256 bits
256 bits
●
●
ON OFF only
Const ON-OFF
Fast Wake- up on RSSI
●
●
●
Wake- up Generator +
(●)
●
●
●
●
●
●
Wake - up Interrupt Generator
simple RSSI- WU
only
Interrupt Generation for Fsync ,
MID and EOM
RX_RUN and CLK_OUT output
SPI Interface
Current consumption
Figure 3
●
●
●
●
@ 2.2MHz
@ 2.2MHz
@ 2.2MHz
12 mA
12 mA
12 mA
Baseband Comparison
Application Note
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8
v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Overview and General Comparison
BDTIC
Application Note
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9
v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Different System Approaches
2
Different System Approaches
For the TDA5225, only the DATA or DATA_MATCHFIL output signal can be used (transparent mode; see
Figure 4). BER sensitivity measurements, as noted in the data sheet, use the transparent receive mode TMMF
(DATA_MATCHFIL output signal), where the received data is sampled with ideal data clock. The
DATA_MATCHFIL output signal will provide higher systematic jitter than the DATA output signal.
Please keep in mind, that Sensitivity in this transparent mode is significantly depending on the implemented clock
and data recovery algorithm of the user software in the application controller.
TDA5235/40 can deliver high sensitivity due to internal available multi-bit signals (TDA5225 only delivers a 1-bit
output signal) and a real hardware clock-recovery unit.
The autonomous receive mode of a TDA5235/40, where the host controller can stay in idle mode, leads to reduced
noise of the application controller and improved system performance. Therefore the system standby power
consumption can be further reduced. Especially the usage of TDA5235/40 features like Fast-Fallback or UltrafastFallback further reduces the receivers On time, which has direct influence to the average current consumption.
BDTIC
Blind Sync
Initial Phase & Data rate
FSK
detector
CR PLL
Slicer
CDR PLL
sync
chip_data_clock
adjust_length
CH_STR
SRC
bypass
8 to 16
samples
per chip
Matched Filter
fractional SRC
From ASK/
FSK
emodulator
Signal
Detector
Data
Slicer
Chip Data
Decoder
Chip
Data
Invert
chip_data
CH_DATA
fs out / fs in = 0.5 … 1.0
CHIPDINV
MUX
RAW Data Slicer
for external
processing
Decoder
SIGN
TDA5225
Data
Invert
DINVEXT
DATA
(Sliced RAW Data for
external processing )
Figure 4
Data
Invert
Framer
(TSI Detector)
TDA5235/40
data_clk
data
eom
fsync
FIFO
wakeup
WU Unit
RXSTR RXD
DATA_MATCHFIL
(Matched Filtered Data
for external processing )
Output Sources of Digital Receiver
Application Note
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10
v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Different System Approaches
A typical TDA5225 application is shown in Figure 5, where the application controller is recovering clock and data.
RF in
SAW
filter
4
SPI Bus
VS
XTAL2 15
NCS 16
SDI 18
SCK 17
SDO 19
T1 20
T2 21
LNA_INP 23
GNDRF 24
PP3 25
RSSI 26
LNA_INN 22
Application controller
VS
IF CER
filter
(opt.)
14 XTAL1
13 P_ON
12 PP2
11 PP1
(incl. software clock + data
recovery )
10 PP0
VDDD1V5
GNDD
9
8
VDD5V
VDDD
7
6
IFMIX_INN
5
IFMIX_INP
4
GNDA
TDA5225
3
VDDA 27
IFBUF_OUT
2
1
IFBUF_IN
IF CER
filter
(opt.)
IF_OUT 28
BDTIC
Configure radio
Received
data
NINT (Interrupt source = RSSI)
DATA
Figure 5
Typical TDA5225 Application
A power-up and start-up sequence can look like the following (Power OFF ==> DATA output):
•
•
•
•
•
•
Power Off (P_ON = 0)
• No RF reception is required
Power On (P_ON = 1)
• Initiated by application controller
• TDA5225 has finished after 3ms in maximum (tReset, see item C9 in data sheet)
SLEEP mode is reached (but registers are not configured for the application)
SPI communication required to configure TDA5225 for the target application after (each) Power On cycle.
• Required configuration time is depending on SPI speed and number of registers to configure; last
command is setting the TDA5225 into Run Mode
Run Mode
• After 460µs (typical) the TDA5225 is ready to receive;
• Wait for Data processing delay and Raw Data Slicer settling time
Data at DATA output can be used for processing in the application controller
Note: After a successful start-up, also a receiver polling (on-off duty cycle) can be applied either with the built-in
Self Polling feature or by switching between Run Mode Slave and Sleep Mode. In both cases the register content
of the radio stays preserved.
Application Note
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TDA5240 Family
Technical Selection Guide
Different System Approaches
A typical TDA5235/40 application is shown in Figure 6, where the application controller is only waiting for an
interrupt to readout the received payload from the FIFO.
RF in
SAW
filter
4
SPI Bus
VS
GNDD
9
NCS 16
SDI 18
XTAL2 15
14 XTAL1
VDDD1V5
8
13 P_ON
VDDD
7
VS
12 PP2
VDD5V
6
11 PP1
IFMIX_INN
5
10 PP0
IFMIX_INP
4
Application controller
IF CER
filter
(opt.)
Figure 6
SCK 17
T1 20
SDO 19
T2 21
LNA_INP 23
LNA_INN 22
GNDRF 24
PP3 25
RSSI 26
GNDA
3
IFBUF_OUT
2
VDDA 27
IFBUF_IN
1
IF CER
filter
(opt.)
IF_OUT 28
BDTIC
TDA5235 or TDA5240
Configure radio /
Read RX FIFO data
Detect a
received
packet
NINT (Interrupt source = EOM)
Typical TDA5235/40 Application
The power-up and start-up sequence can look like the following (Power OFF ==> ready to receive):
•
•
•
•
•
•
Power Off (P_ON = 0)
• No RF reception is required
Power On (P_ON = 1)
• Initiated by application controller
• TDA5235/40 has finished after 3ms in maximum (tReset, see item C9 in data sheet)
SLEEP mode is reached (but registers are not configured for the application)
SPI communication required to configure TDA5235/40 for the target application after the Power On cycle.
• Required configuration time is depending on SPI speed and number of registers to configure; last
command is setting the TDA5235/40 either into Run Mode Slave or Self Polling Mode (In both cases
the register content of the radio stays preserved).
Run Mode Slave (similar is valid for Self Polling Mode)
• After 460µs (typical) the TDA5235/40 is ready to receive;
• The receiver is scanning autonomously for the target data and if successful, the application controller
gets informed (NINT) to pick data from the FIFO via SPI.
Self Polling Mode
• Additionally, the receiver is automatically polling (on-off duty cycle) to further reduce the average
current consumption.
Application Note
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v1.0, 2010-03-24
TDA5240 Family
Technical Selection Guide
Overall System Current Consumption
3
Overall System Current Consumption
The current consumption of TDA5225 and TDA5235/40 are equal.
In a TDA5225 system the RAW Data Slicer settling time needs to be taken into account for the average current
consumption.
A system using the TDA5225 will have a higher overall system current consumption, as an additional current is
required for the „high performance“ software clock recovery in the application controller.
Features like FFB or UFFB are only available in TDA5235/40, but not in TDA5225. Therefore the decision on valid
data must be taken by the application controller, which must stay ON for the „whole“ time of reception and
consumes current at this time.
TDA5225 only has RSSI criterion for Wake-up (WU) generation. This is the weakest WU criterion and will lead to
False-Alarms (= unnecessary wake-ups of the application controller) as an appropriate RSSI threshold needs to
be set for not losing sensitivity (please note that RSSI shows a slight temperature dependency, which needs to be
taken into account).
BDTIC
Therefore the overall system current consumption using a TDA5225 will always be higher compared to a system
using a TDA5235 or TDA5240.
Application Note
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v1.0, 2010-03-24
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