Datasheet > U2090B

U2090B

更新时间： 2024-11-10 22:18:27

品牌	Logo	应用领域
爱特美尔 - ATMEL		手机
页数	文件大小	规格书
34页	675K
描述
Monolithic Integrated Feature Phone Circuit

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U2090B 数据手册

U4090B

Monolithic Integrated Feature Phone Circuit

Description

The µc controlled telephone circuit U4090B is a linear An integrated voice switch with loudspeaker amplifier

integrated circuit for use in feature phones, answering allows loudhearing or handsfree operation. With an

machines and fax machines. It contains the speech circuit, anti-feedback function, acoustical feedback during

tone ringer interface with dc/dc converter, sidetone loudhearing can be reduced significantly. The generated

equivalent and ear protection rectifiers. The circuit is line supply voltage is suitable for a wide range of peripheral

powered and contains all components necessary for circuits.

amplification of signals and adaptation to the line.

Features

DC characteristic adjustable

Voice switch

Transmit and receive gain adjustable

Symmetrical input of microphone amplifier

Anti-clipping in transmit direction

Automatic line loss compensation

Symmetrical output of earpiece amplifier

Built-in ear protection

Tone ringer interface with dc/dc converter

Zero crossing detection

Common speaker for loudhearing and tone ringer

Supply voltages for all functional blocks of a

subscriber set

Integrated transistor for short circuiting the line

voltage

DTMF and MUTE input

Answering machine interface

Adjustable sidetone suppression independent

of sending and receiving amplification

Operation possible from 10 mA line currents

Speech circuit with two sidetone networks

Built-in line detection circuit

Benefits

Integrated amplifier for loudhearing operation

Anti-clipping for loudspeaker amplifier

Improved acoustical feedback suppression

Power down

Savings of one piezo electric transducer

Complete system integration of analog signal proces-

sing on one chip

Very few external components

Applications

Feature phone, answering machine, fax machine, speaker

phone

Loudhearing

Audio

amplifier

Speech

circuit

and

Tone ringing

Voice

switch

Tone

ringer

MC with

EEPROM/

DTMF

94 8741

TELEFUNKEN Semiconductors

1 (34)

Rev. C1, 28-Oct-96

Preliminary Information

12 3 4 5 6 7...34

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