Sharp HT-X1H, Service Manual

Page: 52 / 88

HT-X1H
8 – 1
Audio HT-X1H Service Manual HT-X1H Market E CHAPTER 8.
OTHER
[1] Function table of IC
IC505 VHiLC75341M-1: Audio Processor (LC75341M)
Pin No. Terminal Name Function
1 DI Serial data and clock input pin for con-
trol.
2 CE Chip enable pin.
Data written into an internal latch in a
timing of "H" to "L".
Each analog switch is activated.
Data transfer enabled at "H" level.
3 VSS Ground pin.
4 LOUT Bass band filter comprising
capacitor and resistor connection pin
and bass/treble output pin.
5 LBASS Bass band filter comprising capacitor
and resistor connection pin.
6 LTRE Treble band filter comprising capacitor
and resistor connection pin.
7 LIN equalizer output pin.
8 LSEL0 Input selector output pin.
9-12 L4-1 Input signal pin.
Pin No. Terminal Name Function
13-16 R1-4 Input signal pin.
17 RSEL0 Input selector output pin.
18 RIN equalizer output pin
19 RTRE Treble band filter comprising capacitor
and resistor connection pin.
20 RBASS Bass band filter comprising capacitor
and resistor connection pin.
21 ROUT Bass band filter comprising capacitor
and resistor connection pin and bass/
treble output pin.
22 VREF 0.5x VDD voltage generation block
for analog ground. Capacitor of sev-
eral 10µF to be connected between
VREF and AWSS (VSS) as a counter-
measure against power ripple.
23 VDD Supply pin
24 CLK Serial data and clock input pin for con-
trol.
19 20 21
22
23
24
1
2
3
4 5 6 7 8
9
10
11
12
13
14
15
16
18 17
LVref
RVref
CONTROL
CIRCUIT
CONTROL
CIRCUIT
CONTROL
CIRCUIT
LOUT LBASS LIN LSEL0
L4
L3
L2
L1
R1
R2
R3
R4
RSEL0
RIN
RTRE
LTRE
RBASS
ROUT
VREF
VDD
CLK
DI
CE
VSS
CCB
INTERFACE
CD
Tuner
Tape
Video
Figure 8-1 BLOCK DIAGRAM OF IC