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Atmel Electronic Components Datasheet

U4091BM-N Datasheet

Programmable Telephone Audio Processor

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Features
Speech Circuit with Anti-clipping
Tone-ringer Interface with DC/DC Converter
Speaker Amplifier with Anti-distortion
Power-supply Management (Regulated, Unregulated) and a Special Supply for Electret
Microphone
Voice Switch
Interface for Answering Machine and Cordless Phone
Applications
Feature Phone
Answering Machine
Fax Machine
Speaker Phone
Cordless Phone
Programmable
Telephone
Audio
Processor
Benefits
No Piezoelectric Transducer for Tone Ringing Necessary
Complete System Integration of Analog Signal Processing on One Chip
Very Few External Components
U4091BM-N
Description
The programmable telephone audio processor U4091BM-N is a linear integrated cir-
cuit for use in feature phones, answering machines and fax machines. It contains the
speech circuit, tone-ringer interface with DC/DC converter, sidetone equivalent and
ear-protection rectifiers. The circuit is line-powered and contains all components nec-
essary for signal amplification and adaptation to the line. The U4091BM-N can also be
supplied via an external power supply. An integrated voice switch with loudspeaker
amplifier enables hands-free or loudhearing operation. With an anti-feedback function,
acoustic feedback during loudhearing can be reduced significantly. The generated
supply voltage is suitable for a wide range of peripheral circuits.
Rev. 4666B–CORD–08/04
http://www.Datasheet4U.com


Atmel Electronic Components Datasheet

U4091BM-N Datasheet

Programmable Telephone Audio Processor

No Preview Available !

Figure 1. Block Diagram
Speech
circuit
DTMF
Voice
switch
Serial
bus
Audio
amplifier
Tone
ringer
Clock
Data
Reset
MCU
2 U4091BM-N
4666B–CORD–08/04


Part Number U4091BM-N
Description Programmable Telephone Audio Processor
Maker ATMEL
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U4091BM-N Datasheet PDF






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1 U4091BM-N Programmable Telephone Audio Processor
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