JVC TH-A30 Service Manual page 28

TH-A30
TDA7449L (U7, U12) : Audio processor
1.Pin layout
CREF 1 20
V 2 19
S
PGND 3 18
ROUT 4 17
LOUT 5 16
R_IN2 6 15
R_IN1 7 14
L_IN1 8 13
L_IN2 9 12
MUXOUT(L) 10 11
TL3472 (RU2) : Op. amp.
1.Pin layout
1OUT
1
1IN±
2
1IN+
3
V /GND
4
CC±
1-28
2.Block diagram
SDA
8
L-IN1
SCL
100K
DIG_GND
N.C.
9
L-IN2
N.C.
100K
N.C.
N.C.
N.C.
N.C.
7
R-IN1
MUXOUT(R)
100K
6
R-IN2
100K
V
8
CC+
2OUT
7
2IN±
6
2IN+
5
MUXOUTL
10
G VOLUME
0/30dB
2
I CBUS DECODER + LATCHES
2dB STEP
G VOLUME
INPUT MULTIPLEXER
+ GAIN
11
MUXOUTR
5
SPKR ATT
LOUT
LEFT
19
SCL
20
SDA
18
DIG_GND
4
SPKR ATT
ROUT
RIGHT
V
REF
2
V
S
SUPPLY 3
AGND
1
CREF D98AU868