Philips Semiconductors Preliminary specification IS-54 IF receiver SA638 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 compact 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 OUT AP...

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