SA638 Datasheet | Philips Semiconductors

Philips Semiconductors Preliminary specification IS-54 IF receiver DESCRIPTION The SA638 is an IF receiver chip which serves the dual mode functionality required by the IS- 54 standards for North American cellular telephones. It provides for both the analog FM (AMPS mode) and DQPSK (TDMA digital mode) IF receive functions in a monolithic BiCMOS Integrated Circuit housed in a pact SSOP- 24 plastic package. PIN CONFIGURATION RFIN RF BYPASS XTAL OSC (EMITTER) 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 MIXER OUT IF AMP DECOUPLING IF AMP IN IF AMP DECOUPLING IF AMP OUT GND LIMITER IN LIMITER DECOUPLING LIMITER DECOUPLING LIMITER OUT QUADRATURE IN SWITCH...