Pioneer DVR-310-S Service Manual page 90

1
LC75342M (TUMJ ASSY : IC2801)
• Electric Volume IC
A
Block Diagram
B
C
Pin Function
No. Pin Name
1 DI Serial data input for control
Chip enable pin
Data are written in the internal latch by a timing
of "H" → "L", and each analog switch works.
2 CE
Data transfer is enabled by "H" level.
D
3 VSS Ground pin
Pin for electronic volume test
4 TEST
Set to VSS electric potential.
5 LOUT Volume and equalizer output pin
6 LBASS2
Capacitor and resistor connection pins for bus
bandpass filter
7 LBASS1
Capacitor connection pin for treble bandpass
8 LTRE
filter
9 LIN Volume and equalizer input pin
E
10 LSELO Input selector output pin
11 L4
12 L3
Input signal pins
13 L2
14 L1
15 NC Not connected
F
90
1
2
10 9 8
11
L4
L3 12
13
L2
Control
14
L1 Circuit
NC 15
Logic
Circuit
NC
16
R1 17
Control
Circuit
R2
18
R3
19
R4 20
21 22 23
Function
DVR-310-S
2
3
7 8 5
LVref
CCB
Interface
RVref
24 25 26
No. Pin Name
16 NC Not connected
17 R1
Input signal pin
18 R2
19 R3
20 R4
21 RSELO Input selector output pin
22 RIN Volume and equalizer input pin
Capacitor connection pin for treble bandpass
23 RTRE
filter
24 RBASS1
Capacitor and resistor connection pins for bus
bandpass filter
25 RBASS2
26 ROUT Volume and equalizer output pin
27 NC Not connected
0.5XVDD voltage generation block
28 Vref
29 VDD Power supply pin
30 CL Clock input pin for control
3
4
4 TEST
3 VSS
2 CE
1 DI
30 CL
29 VDD
28 Vref
27 NC
Function
4