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TDA5250INFIEONN/a302avaiASK/FSK 868MHz Wireless Transceiver


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TDA5250
ASK/FSK 868MHz Wireless Transceiver
Wireless Components
ASK/FSK 868MHz Wireless Transceiver
TDA 5250 D2
Version 1.6
Edition 07.02
Published by Infineon Technologies AG,
Balanstraße 73,
81541 München

© InfineonTechnologiesAG July 2002.
All Rights Reserved.
Attention please!

As far as patents or other rights of third parties are concerned, liability is only assumed for components, not for applications, processes and circuits im-
plemented within components or assemblies.
The information describes the type of component and shall not be considered as assured characteristics.
Terms of delivery and rights to change design reserved.
Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest
InfineonTechnologies Office.
InfineonTechnologiesAG is an approved CECC manufacturer.
Packing

Please use the recycling operators known to you. We can also help you – get in touch with your nearest sales office. By agreement we will take packing
material back, if it is sorted. You must bear the costs of transport.
For packing material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs incurred.
Components used in life-support devices or systems must be expressly authorized for such purpose!

Critical components1 of the InfineonTechnologiesAG, may only be used in life-support devices or systems2 with the express written approval of the
InfineonTechnologiesAG.A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the failure of that life-
support device or system, or to affect its safety or effectiveness of that device or system.Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain human life. If they
fail, it is reasonable to assume that the health of the user may be endangered.
Product Info
confidential
Product Info
General Description
The IC is a low power consumption
single chip FSK/ASK Transceiver for
half duplex low datarate communica-
tion in the 868-870MHz band. The IC
offers a very high level of integration
and needs only a few external compo-
nents. It contains a highly efficient
power amplifier, a low noise amplifier
(LNA) with AGC, a double balanced
mixer, a complex direct conversion
stage, I/Q limiters with RSSI genera-
tion, an FSK demodulator, a fully inte-
grated VCO and PLL synthesizer, a
tuneable crystal oscillator, an onboard
data filter, a data comparator (slicer),
positive and negative peak detectors,
a data rate detection circuit and a 2/3-
wire bus interface. Additionally there is
a power down feature to save battery
power.
Features
�Low supply current (Is = 9mA typ.
receive, Is = 12mA typ. transmit
mode)Supply voltage range 2.1 - 5.5VPower down mode with very low
supply current consumptionFSK and ASK modulation and
demodulation capabilityFully integrated VCO and PLL
synthesizer and loop filter on-chip
with on chip crystal oscillator tuningI2C/3-wire µController InterfaceOn-chip low pass channel select fil-
ter and data filter with tuneable
bandwidth Data slicer with self-adjusting
threshold and 2 peak detectorsFSK sensitivity <-109dBm, ASK
sensitivity < –109dBmTransmit power up to +13dBmDatarates up to 64kBit/sSelf-polling logic with ultra fast data
rate detection
Applications
�Low Bitrate Communication
SystemsKeyless Entry SystemsRemote Control SystemsAlarm SystemsTelemetry SystemsElectronic MeteringHome Automation Systems
Ordering Information
Table of ContentsTable of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.1Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2.2Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2.3Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.4Package Outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
3.1Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
3.2Pin Definition and Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3.3Functional Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3.4Functional Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.4.1Power Amplifier (PA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.4.2Low Noise Amplifier (LNA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.4.3Downconverter 1st Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3.4.4Downconverter 2nd I/Q Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.4.5PLL Synthesizer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.4.6I/Q Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.4.7I/Q Limiters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.4.8FSK Demodulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3.4.9Data Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4.10Data Slicer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4.11Peak Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.4.12Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.4.13Bandgap Reference Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.4.14Timing and Data Control Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.4.15Bus Interface and Register Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.4.16Wakeup Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.4.17Data Valid Detection, Data Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3.4.18Sequence Timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.4.19Clock Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.4.20RSSI and Supply Voltage Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
4.1LNA and PA Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.1.1RX/TX Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.1.2Power-Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4.2Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.2.1Synthesizer Frequency setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.2.2Transmit/Receive ASK/FSK Frequency Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.2.3Parasitics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2.4Calculation of the external capacitors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.2.5FSK-switch modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.2.6Finetuning and FSK modulation relevant registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.2.7Chip and System Tolerances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
IQ-Filter 24
Data Filter 25
4.5Limiter and RSSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.6Data Slicer - Slicing Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.6.1RC Integrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4.6.2Peak Detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
4.6.3Peak Detector - Analog output signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
4.6.4Peak Detector – Power Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
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