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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 proces-

sing 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

MCU

Ordering Information

Extended Type Number

U4091BM-MFN

U4091BM-MFNG3

Package

SSO44

SSO44

Taped and reeled

Remarks

Rev. A3, 27-Oct-00

1 (32)

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U4091BM-MFN相關(guān)型號(hào)PDF文件下載

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