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TEMIC Semiconductors |
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Programmable Telephone Audio Processor
U4091BM
Description
The programmable telephone audio processor U4091BM
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 circuit is line-powered and contains all
components necessary for signal amplification and
adaptation to the line. The U4091BM 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,
acoustical feedback during loudhearing can be reduced
significantly. The generated supply voltage is suitable for
a wide range of peripheral circuits.
Features
D Speech circuit with anti-clipping
D Tone-ringer interface with DC/DC converter
D Speaker amplifier with anti-distortion
D Power-supply management (regulated, unregulated)
and a special supply for electret microphone
D Voice switch
D Interface for answering machine and cordless phone
Benefits
D No piezoelectric transducer for tone ringing necessary
D Complete system integration of analog signal proces-
sing on one chip
D Very few external components
Applications
Feature phone, answering machine, fax machine, speaker
phone, cordless phone
Block Diagram
Speech
circuit
DTMF
Ordering Information
Extended Type Number
U4091BM-AFN
U4091BM-AFNG3
Voice
switch
Serial
bus
Audio
amplifier
Tone
ringer
Clock
Data
Reset
MCU
14601
Package
SSO44
SSO44
Remarks
Taped and reeled
Rev. A1, 02-Jun-98
Target Specification
1 (29)
V MIC
VL
2 43 44 1
TXACL
5
STBAL
4
39
3
MICRO
AGARX
TXA
Offset
DTMF/
Offset
canceler melody canceler
40
Filter
AGC
41
7
AGCO AMPB LRX
DTMF
Switch matrix
AGCI AMREC EPO RXLS
MIC
LTX
42 38
9
AGATX
10 8
Power
supply
MUX
ADC
Ringing
power
converter
LIDET VMP RFDO
17
15
16
12
11
30
22
21
19
20
REG
POR
6 RA
18
SACL
AFS
SA control
14 13 35 34 37 36 33 31 32
BIDIR
serial
bus
DIV.
1/8/16/32
OSC.
3.58 MHz
24 25 23
26
27 29 28
V RING
RECO1
MICO
VMP
mC
14572
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