KESRX04

KESRX04 260 to 470MHz. ASK Receiver with Power Down Preliminary Information DS4997 - 1.5 August 1998 The KESRX04 is a single chip ASK (Amplitude Shift Key) Receiver IC. It is designed to operate in a variety of low power radio applications including keyless entry, general domestic and industrial remote control, RF tagging and local paging systems. The receiver offers an exceptionally high level of integration and performance to meet the local oscillator radiation requirements of regulatory authorities world-wide. Functionally the device works in the same way as the KESRX01 with the added features of low supply voltage, in-band interference rejection (anti-jamming detector), a 2 stage power down to enable receiver systems to be implemented with less than 1mA supply, and a wide IF bandwidth and drive stage to interface to an external ceramic IF band pass filter at intermediate frequencies from 0.2MHz to 15MHz. The KESRX04 is an ideal receiver for difficult reception areas where high level interferers would jam the wanted signal. The anti-jamming circuit allows operation to be possible with interfering signals which are more than 14dB stronger than the wanted signal, without the cost penalties of increased IF selectivity and frequency accuracy. P IFFLT1 IFDC1 IFFLT2 RSSI PIN 1 REF. SPOT IFIN IFDC2 VCC IFOUT VCCRF MIXIP RFOP VEERF RFIN AGC PEAK DATOP DETB PD XTAL1 XTAL2 DF0 DF1 DF2 VCO1 VCO2 VEE LF DSN (9.80/10.01) QP28 Figure 1 Pin Connections (top view) FEATURES s In...