U4091BM - TEMIC Semiconductors

U4091BM Programmable Telephone Audio Processor

The programmable telephone audio processor U4091BM 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 signal amplificat.

Features

D Speech circuit with anti-clipping D Tone-ringer interface with DC/DC converter D Speaker amplifier with anti-distortion D Power-supply management (regulated, unregulated) and a special supply for electret microphone D Voice switch D Interface for answering machine and cordless phone Benefits D No piezoelectric transducer for tone ringing necessary D Complete system integration of analog signal processing on one chip D Very few external components Applications Feature phone, answering machine, fax machine, speaker phone, cordless phone Block Diagram Speech circuit Voice switch Audio amp.