U4089B Datasheet, PDF (2/25 Pages) ATMEL Corporation – MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT

Figure 2. Block Diagram
MIC1
MIC2
4
3 ^MIC
1
DTMF
41
TX
TTXA
ACL
INLDR
INLDT
TLDR
TLDT
ATAFS
27
26
Acoustical
29 _feedback
28 ^suppression
control
25
11
SAO
21 ^SACL
TSACL
23
SAI
22
GSA
GT
44
STO V _L
32
7 _{600 W}
IMPSEL AGA IND
20
30 6
SENSE V _B
9 10
V _MP
13
900 W
TXA
Impedance
control
Power
supply
33 ^{V M}
GND
8
Transmit
mute
control
AGA
control
Current
supply
I _REF
31
Supply
R-
attenuation
24
MUTX
39
RECO
40
GR
36
STI
42
RECIN
2 U4089B-M
4570A–CORD–04/03