U4091B - TEMIC Semiconductors

U4091B Programmable Telephone Audio Processor

The programmable telephone audio processor U4091B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The circuit is line powered and contains all components necessary for amplification of s.

Features

D D D D Speech circuit with anti-clipping Tone ringer interface with dc / dc converter Speaker amplifier with anti-distortion Power supply management, regulated, unregulated and a special supply for electret microphone Benefits D Savings of one piezo electric transducer D Complete system integration of analog signal processing on one chip D Very few external components D Voice switch Applications Feature phone, answering machine, fax machine, speaker phone Speech circuit Voice switch ÁÁ ÁÁ BUS Audio amplifier Loudhearing and Tone ringing MC with EEPROM/ DTMF Tone ringer Rev. A1: 12.0.