General Description

The IC is a very low power consumption single chip FSK/ASK Superheterodyne Receiver (SHR) for the frequency bands 810 to 870 MHz and 400 to 440 MHz that is pin compatible with the ASK Receiver TDA5200. The IC offers a high level of integration and needs only a few external components. The device contains a low noise amplifier (LNA), a double balanced mixer, a fully integrated VCO, a PLL synthesiser, a crystal oscillator, a limiter with RSSI generator, a PLL FSK demodulator, a data filter, a data comparator (slicer) and a peak detector. Additionally there is a power down feature to save battery life.

Features

■ Low supply current (typ. at 868MHz

   Is = 5.9mA in FSK mode,

   Is = 5.2mA in ASK mode)

■ Supply voltage range 5V ±10

■ Power down mode with very low

   supply current (50nA typ)

■ FSK and ASK demodulation capability

■ Fully integrated VCO and PLL Synthesiser

■ ASK sensitivity < –107dBm

■ Selectable frequency ranges 810-870 MHz and 400-440 MHz

■ Limiter with RSSI generation, operating at 10.7MHz

■ Selectable reference frequency

■ 2nd order low pass data filter with external capacitors

■ Data slicer with self-adjusting threshold

■ FSK sensitivity

Application

■ Keyless Entry Systems

■ Remote Control Systems

■ Alarm Systems

■ Low Bitrate Communication Systems