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TDA5255E1
ASK/FSK 434MHz Wireless Transceiver
TDA5255 E1
ASK/FSK 434MHz Wireless
Transceiver
Preliminary Specification
Confidential
Revision History:2002-11-28TDA5255 E1
Previous Version:1.0, 2002-10-30
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ASK/FSK 434MHz Wireless Transceiver
TDA5255 E1
Version 1.1
Product Info
General DescriptionThe IC is a low power consumption single chip FSK/ASK
Transceiver for half duplex low datarate communication in the
433-435MHz band. The IC offers a very high level of integration
and needs only a few external components. 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 generation, an FSK demodulator, a fully
integrated 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.
FeaturesLow supply current (Is = 9mA typ. receive, Is
= 13mA 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 tuning2C/3-wire µController InterfaceOn-chip low pass channel select filter 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 100kBit/s Manchester
EncodedSelf-polling logic with ultra fast data rate
detection
ApplicationLow Bitrate Communication
SystemsKeyless Entry SystemsRemote Control Systems
–Alarm SystemsTelemetry SystemsElectronic MeteringHome Automation Systems
