Function Table Of Ic - Sharp XL-70 Service Manual

XL-70/70C
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
Pin No. Port Name
1 DI
2 CE
3 VSS
4 TEST
5 LOUT
6 LBASS2
7 LBASS1
8 LTRE
9 LIN
10 LSEL0
11-14 L4-L1
15* NC
16* NC
17-20 R1-R4
21 RSEL0
22 RIN
23 RTRE
24 RBASS1
25 RBASS2
26 ROUT
27* NC
28 Vref
29 VDD
30 CL
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
IC401 VHiLC75342M-1: Function/Volume Equalizer (LC75342M)
NC 27
Vref 28
VDD 29
CL
30
1
DI
CE 2
3
VSS
TEST 4

FUNCTION TABLE OF IC

Serial data and clock input pin for control.
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.
Ground pin.
Electronic volume control pin. To be set to the VSS potential.
Volume + equalizer output pin.
Bass-band filter comprising capacitor and resistor connection pin.
Bass-band filter comprising capacitor and resistor connection pin.
Capacitor connection pin comprising treble band filter.
Volume + equalizer input pin.
Input selector output pin.
Input signal pin.
No CONNECT pin. To be open or connected to VSS.
No CONNECT pin. To be open or connected to VSS.
Input signal pin.
Input selector output pin.
Volume + equalizer input pin.
Capacitor connection pin comprising treble band filter.
Bass-band filter comprising capacitor and resistor connection pin.
Bass-band filter comprising capacitor and resistor connection pin.
Volume + equalizer output pin.
No CONNECT pin. To be open or connected to VSS.
0.5 x VDD voltage generation block for analog ground. Capacitor of several 10µF to be connected between
Vref and AWSS (VSS) as a counter measure against power ripple.
Supply pin.
Serial data and clock input pin for control.
RBASS1
ROUT RBASS2
26 25
24
RVref
CCB
INTERFACE
LVref
5 6
7
LOUT LBASS2 LBASS1
Figure 40 BLOCK DIAGRAM OF IC
Function
RIN RSEL0
RTRE
23 22 21
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
8 9 10
LIN LSEL0
LTRE
– 40 –
20 R4
19 R3
18
R2
17 R1
16 NC
15 NC
L1
14
13 L2
12 L3
11
L4