U4089B-P Datasheet, PDF (1/26 Pages) ATMEL Corporation – Monolithic Integrated Feature Phone Circuit

Features
• DC Characteristic Adjustable
• 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 Loudhearing 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
Monolithic
Integrated
Feature Phone
Circuit
Benefits
• Complete System Integration of Analog Signal Processing on One Chip
• Very Few External Components
• Less Components for EMI protection
U4089B-P
Applications
• Feature Phones
• Answering Machines
• Fax Machines
• Speaker Phones
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 loudhearing 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.
Electrostatic sensitive device.
Observe precautions for handling.
Rev. 4518A–CORD–05/02
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