u4090b-p ATMEL Corporation, u4090b-p Datasheet - Page 2

• Manufacturer Part Number: u4090b-p
• Description: U4090b-p Monolithic Integrated Feature Phone Circuit Emi Improved
• Manufacturer: ATMEL Corporation

1. Description
2
U4090B-P
The microcontroller-controlled telephone circuit U4090B-P is a linear integrated circuit 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 cir-
cuit is line powered and contains all components necessary for amplification of signals and
adaptation to the line.
An integrated voice switch with loudspeaker amplifier allows loud-hearing or hands-free opera-
tion. 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.
Figure 1-1.
Block Diagram
Speech
switch
circuit
Voice
amplifier
Audio
ringer
Tone
EEPROM/
Loudhearing
Tone ringing
MC with
DTMF
and
4741C–CORD–11/05