General Description

The IC is a very low power consumption single chip FSK/ASK Superhet erodyne Receiver (SHR) for the frequency band 300 to 340 MHz. 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 (Is = 6.4 mA typ. in FSK mode, Is = 5.6 mA typ. 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 better than -110 dBm over specified temperature range (- 40 to +105°C)

■ Selectable frequency ranges 300-320 MHz and 300-340 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 better than -102 dBm over specified temperature range (- 40 to +105°C)

Applications

■ Keyless Entry Systems

■ Remote Control Systems

■ Alarm Systems

■ Low Bitrate Communication Systems