U4089B-P

Manufacturer Part NumberU4089B-P
DescriptionMonolithic Integrated Feature Phone Circuit
ManufacturerATMEL Corporation
U4089B-P datasheet
 
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Features
Adjustable DC Characteristic
Transmit and Receive Gain Adjustable
Symmetrical Input of Microphone Amplifier
Anti-clipping in Transmit Direction
Automatic Line-loss Compensation
Built-in Ear Protection
DTMF and MUTE Input
Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification
Integrated Amplifier for Open-listening 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
Filters Against EMI on Critical I/O
Benefits
Complete System Integration of Analog Signal Processing on One Chip
Very Few External Components
Less Components for EMI protection
Applications
Feature Phones
Answering Machines
Fax Machines
Speaker Phones
1. Description
The telephone circuit U4089B-P is a linear integrated circuit for use in feature phones,
answering machines and fax machines. It contains the speech circuit, sidetone
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 loudspeaker amplifier enables
hands-free operation. With an anti-feedback function, acoustical feedback during
can be reduced significantly. The generated supply voltage is suitable for a
listening
wide range of peripheral circuits.
Electrostatic sensitive device.
Observe precautions for handling.
Monolithic
Integrated
Feature Phone
Circuit
U4089B-P
or
open-listening
open
Rev. 4518C–CORD–10/05

U4089B-P Summary of contents