The SL6637 is a lower power direct conversion radio receiver for the reception of frequency shift keyed transmissions. It features the capabilities of 'power down' for battery conservation and control of an external DC-DC converter if single cell operation is required. The device also comes equipped with high current beeper drive and low battery flag indicator. FEATURES Very Low Power Operation - Typ. 4mW Single Cell Operation Complete Radio Receiver in One Package Operation Optimised at 200MHz 200nV Typical Sensitivity Operates at 1200 BPS APPLICATIONS Low Power Radio Data Receiver Radio Paging Ultrasonic Direction Indication Security Systems If the waveform at limiter '1' input leads the waveform at the limiter '2' input by 90", output at the detector output will be a high level, and low at the Data Output. If the waveform at limiter 'l' input lagsthe waveform at the limiter '2' input by 90", output at the detector output will be a low level and hing at the Data Output. PIN FUNCTION 1 Detector O/P 2 BRF I/P 3 BRF O/P Decoder I/P 4 LF Bias Decouple 5 Limiter 'l' FB Decouple 6 Limiter 'l' I/P 7 Follower Filter O/P 8 FollowerFilter I/P 9 Amplifier Filter O/P 10 Amplifier Filter I/P 11 CurrentSource Control (2) 12 Current Source O/P (2) 13 Battery Flag 14 Osc.Current Source O/P(1) 15 Mixer '1' LO I/P 16 Mixer '2' LO I/P 17 Mixer Bias 18 InverterControl O/P 19 Reference O/P 20 Vcc1 21 InverterControl Threshold Adjust 22 Mixer 2 O/P 23 Mixer 1 O/P 24 Power Down 25 Vcc2 26 Ground 27 Ground (Beep) 28 Low Battery Control 29 Beep O/P 30 Beep Vcc1 31 Beep I/P 32 Mixer '2' RF I/P 33 Mixer 'l' RF I/P 34 Amplifier Filter I/P 35 Amplifier Filter O/P 36 Follower Filter I/P 37 Follower Filter O/P 38 RF Bias Decouple 39 RF Amplifier O/P 40 RF Ground 41 RF I/P 42 Limiter '2' I/P 43 Limiter '2' FB Decouple 44 Decoder O/P