U4091BM

www.DataSheet4U.com U4091BM Programmable Telephone Audio Processor Description 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 amplification and adaptation to the line. The U4091BM can also be supplied via an external power supply. An integrated voice switch with loudspeaker amplifier enables hands-free or loudhearing operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. 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 amplifier Clock Data Reset Serial bus DTMF Tone ringer 14601 MCU Ordering...