Sharp MD-E9000H Service Manual page 79

IC401 VHiLC75341/-1: Audio Processor (LC75341)
Pin No. Terminal Name
1 DI
2 CE
3 VSS
4 LOUT
5 LBASS
6 LTRE
7 LIN
8 LSEL0
9-12 (10*) L4-L1
13-16 (15*) R1-R4
17 RSEL0
18 RIN
19 RTRE
20 RBASS
21 ROUT
22 VREF
23 VDD
24 CLK
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
24 23 22 21 20 19 18 17 16
LC75341
1 2 3 4 5 6 7 8 9
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Serial data and clock input terminal for control.
Chip enable terminal.
When changing from "H" to "L", data is written in the internal latch and each analog switch is turned on.
Data transmission is enabled at "H" level.
Ground terminal.
Bass band filter construction capacitor/resistor connection terminal and bass/treble output terminal.
Bass band filter capacitor and resistor connection terminal.
Treble band filter capacitor connection terminal.
L-CH signal input terminal.
Input selector output terminal.
Input signal terminal.
Input signal terminal.
Input selector output terminal.
R-CH signal input terminal.
Treble band filter capacitor connection terminal.
Bass band filter capacitor and resistor connection terminal.
Bass band filter capacitor/resistor connection terminal and bass/treble output terminal.
0.5 × VDD voltage generation section for analog ground. Connect a capacitor of 10 µF or more between
Vref and AVSS (VSS) as a countermeasure against the power supply ripple.
Power supply terminal.
Serial data and clock input terminal for control.
15 14 13
10 11 12
9
L4
L3 10
11
L2
12
L1
13
R1
14
R2
15
R3
16
R4
Figure 79 BLOCK DIAGRAM OF IC
Function
8 7 6
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
17 18 19
– 79 –
MD-E9000H
5 4
3
LVref
2
CCB
1
INTERFACE
24
RVref
23
22
20
21
VSS
CE
DI
CLK
VDD
VREF