U4091BM-R Datasheet, PDF (1/38 Pages) ATMEL Corporation – Programmable Telephone Audio Processor

Features
• Speech Circuit with Anti-clipping
• Tone-ringer Interface with DC/DC Converter
• Speaker Amplifier with Anti-distortion
• Power-supply Management (Regulated and 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 Necessary for Tone Ringing
• Complete System Integration of Analog Signal Processing on One Chip
• Very Few External Components
U4091BM-R
1. Description
The programmable telephone audio processor U4091BM-R 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-R can also be
supplied via an external power supply. An integrated voice switch with loudspeaker
amplifier enables hands-free or open-listening operation. With an anti-feedback func-
tion, acoustic feedback during open listening can be reduced significantly. The
generated supply voltage is suitable for a wide range of peripheral circuits.
Rev. 4872A–CORD–08/05