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U4091BM-N Datasheet, PDF (1/38 Pages) ATMEL Corporation – 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. 4666BâCORDâ08/04
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