DESCRIPTION
The MAS9191A is a high integration BeCMOS IC for implementing the audio and data signal processing in AMPS, ETACS or NAMPS cellular phones. The power consumption of the device is very low due to several automatic and software controlled power down modes as well as the low power characteristics of the BeCMOS process. DTMF receiver is also included to enable answering machine functions for the cellular phone. Only a minimal number of external components are needed to meet typical baseband requirements.

FEATURES
• Voice signal processing including compressor, expander, de-emphasis and pre-emphasis filters and digital gain adjustments
• DTMF and ST generators and DTMF receiver
• Busy/Idle extraction and arbitration with TX block, voting, BCH, data buffering and framing, DCC coding with hardware
• Three 8-bit DACs and two operational amplifiers
• On-chip oscillator with clock output for uP
• 3.3V or 5V operation with low power consumption(RX block at 2mA/3.3V)
• 64-pin TQFP package, -40..85°C operation range

APPLICATIONS
• AMPS/ETACS Cellular phone
• NAMPS Cellular phone