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TDA5251

The IC is a low power consumption single chip FSK/ASK Transceiver for half duplex low datarate communication in the 315MHz 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

Parametric TDA5251 Frequency Band 315.0MHz Channel Requirements per Band Single Channel Modulation Type ASK / FSK Transmit Power (@3V) 9.0dBm Temperature  min  max -40.0°C  85.0°C Frequency Range (@ 25°C)  min  max 312.0MHz  325.0MHz ASK Receive Sensitivity -109.0dBm FSK Receive Sensitivity -109.0dBm Supply Voltage  min  max 2.1V  5.5V Sales Product Name TDA5251 OPN TDA5251XUMA1 Product Status not for new design Package Name PG-TSSOP-38 Completely lead free yes Halogen free yes RoHS compliant yes Packing Size 3000 Packing Type TAPE & REEL

Summary of Features: Low supply current (Is= 9mA typ. receive, Is = 13mA typ. transmit mode) Supply voltage range 2.1 - 5.5V Power down mode with very low supply current consumption FSK and ASK modulation and demodulation capability Fully integrated VCO and PLL  synthesizer and loop filter on-chip with onchip crystal oscillator tuning I2C/3-wire μController Interface On-chip low pass channel select filter and data filter with tuneable bandwidth Data slicer with self-adjusting threshold and 2 peak detectors FSK sensitivity <-109dBm, ASK sensitivity <109dBm Transmit power up to +13dBm Self-polling logic with ultra fast data rate detection Target Applications: Low Bitrate Communication Systems Keyless Entry Systems Remote Control Systems Alarm Systems Telemetry Systems Electronic Metering Home Automation Systems

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