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

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U4089B-P Summary of contents

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