U4089B

Manufacturer Part NumberU4089B
DescriptionMONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
ManufacturerATMEL Corporation
U4089B datasheet
 


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Features
Adjustable DC Characteristics
Adjustable Transmit and Receive Gain
Symmetrical Input of Microphone Amplifier
Anti-clipping in Transmit Direction
Automatic Line-loss Compensation
Built-in Ear Protection
DTMF and MUTE Input
Adjustable Side Tone Suppression Independent of Sending and Receiving
Amplification
Integrated Amplifier for Loud-hearing Operation
Anti-clipping for Loudspeaker Amplifier
Improved Acoustical Feedback Suppression
Selectable Line Impedance
Voice Switch
Supply Voltages for All Functional Blocks of a Subscriber Set
Operation Possible from 10-mA Line Current
Benefits
Complete System Integration of Analog Signal Processing on One Chip
Very Few External Components
Applications
Feature Phones
Answering Machines
Fax Machines
Speaker Phones
Description
The telephone circuit U4089B-M is a linear integrated circuit for use in feature phones,
answering machines and fax machines. It contains the speech circuit, side tone
equivalent and ear protection rectifiers. The circuit is line-powered and contains all
components necessary for the amplification of signals and adaptation to the line.
An integrated voice switch with a loudspeaker amplifier enables loud-hearing or
hands-free operation. With an anti-feedback function, acoustical feedback during loud-
hearing can be reduced significantly. The generated supply voltage is suitable for a
wide range of peripheral circuits.
Figure 1. Simple Block Diagram
Speech
circuit
Voice
switch
Audio
amplifier
Dialer
Monolithic
Integrated
Feature Phone
Circuit
U4089B-M
Rev. 4570A–CORD–04/03
1

U4089B Summary of contents