ACE9040 provides all the speech signal processing and data/SAT tone filtering needed for AMPS or TACS analog cellular telephones. Transmit voice channel functions comprise a microphone amplifier, soft limiter, bandpass filter, compressor, hard limiter, lowpass filter and a gain controlled amplifier to set deviation level. Additional transmit circuits include a DTMF generator, data and SAT filters, deviation setting amplifiers for data/ST and SAT and a modulation combiner. FEATURES ■ Low Power and Low Voltage (3·6 to 5·0 V) Operation ■ Power Down Modes ■ Direct Connections to Microphone and Earpiece ■ Compander with wide operating range: Compressor 74 db typ., Expander 36 dB typ. ■ SAT Bandpass and Data Lowpass Filters ■ Handsfree Operation Supported ■ DTMF Generator ■ Serial Bus Controlled Gains and Filter Responses ■ Part of the ACE Integrated Cellular Phone Chipset ■ TQFP 64 Pin 10X10 mm or 7X7 mm Packages APPLICATIONS ■ AMPS and TACS Cellular Telephones ■ Two-Way Radio Systems
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