Harman Kardon AVR 3550

1dB
VR
latch
8dB
VR
latch
1dB
VR
latch
8dB
VR
latch
3 to 7
decoder
4 to 13
decoder
1dB
VR
latch
Shift register (32BIT)
Strobe generate
circuit
Level shift circuit
8dB
VR
latch
2
3 L-OUTA
NC VSS VDD TEST
L-INA
4
5 L-A-GNDA
L-OUTB
6
L-INB
7
8 L-A-GNDB
L-OUTC
9
L-INC
10
12 CS1
GND
13
CK
14
L-A-GNDC
11
3 L-OUTA
L-INA
4
5 L-A-GNDA
L-OUTB
Same as L-ch
Circuit
6
L-INB
7
8 L-A-GNDB
L-OUTC
9
L-INC
10
12 CS1
GND
13
CK
14
L-A-GNDC
11
1 28 27
TC9482F (ELECTRONIC VOLUME/INPUT) : IC31