Read Sharp XL-T300 (serv.man18) Service Manual online
– 45 –
XL-T300H
FUNCTION TABLE OF IC
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
1
DI
Serial data and clock input pin for control.
2
CE
Chip enable pin. Data written into an internal latch in a timing of [H] -> [L]. Each analog switch is activated.
Data transfer enabled at [H] level.
Data transfer enabled at [H] level.
3
VSS
Ground pin.
4
TEST
Electronic volume control pin. To be set to the VSS potential.
5
LOUT
Volume + equalizer output pin.
6
LBASS2
Bass-band filter comprising capacitor and resistor connection pin.
7
LBASS1
Bass-band filter comprising capacitor and resistor connection pin.
8
LTRE
Capacitor connection pin comprising treble band filter.
9
LIN
Volume + equalizer input pin.
10
LSEL0
Input selector output pin.
11
L4
Input signal pin.
12
L3
Input signal pin.
13
L2
Input signal pin.
14
L1
Input signal pin.
15*
NC
No CONNECT pin. To be open or connected to VSS.
16*
NC
No CONNECT pin. To be open or connected to VSS.
17
R1
Input signal pin.
18
R2
Input signal pin.
19
R3
Input signal pin.
20
R4
Input signal pin.
21
RSEL0
Input selector output pin.
22
RIN
Volume + equalizer input pin.
23
RTRE
Capacitor connection pin comprising treble band filter.
24
RBASS1
Bass-band filter comprising capacitor and resistor connection pin.
25
RBASS2
Bass-band filter comprising capacitor and resistor connection pin.
26
ROUT
Volume + equalizer output pin.
27*
NC
No CONNECT pin. To be open or connected to VSS.
28
Vref
0.5 x VDD voltage generation block for analog ground. Capacitor of several 10
µ
F to be connected between
Vref and AWSS (VSS) as a counter measure against power ripple.
29
VDD
Supply pin.
30
CL
Serial data and clock input pin for control.
Pin No.
Port Name
Function
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
XL-T300H
– 46 –
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
6
7
8
9
10
11
12
13
14 15 16 17
18
19
20
21
22
23
24
25
26
5
27
28
30
29
1
2
3
4
LVref
RVref
CCB
INTERFACE
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
ROUT
RBASS1
RBASS2
RTRE
RIN
RSEL0
L1
L2
L3
L4
R1
R2
R3
R4
LOUT
LBASS2
LBASS1
LTRE
LIN
LSEL0
VSS CE
DI
CL VDD
NC
Vref
NC
NC
TEST
Figure 46 BLOCK DIAGRAM OF IC
Display
