Sanyo DC-MCR50 Service Manual page 8

IC BLOCK DIAGRAM & DESCRIPTION
IC501 LC75342 (2 band equalizer)
L4
L3
L2
L1
NC
NC
R1
R2
R3
R4
Pin functions
Pin Number
14
13
12
11
17
18
19
20
10
21
7
6
24
25
9
22
5
26
8
23
28
3
29
2
1
30
4
15
16
27
LSELO LIN LTRE
10 9 8
11
12
13
CONTROL
CIRCUIT
14
15
LOGIC
CIRCUIT
16
17
CONTROL
CIRCUIT
18
19
20
21 22 23
RSELO RIN RTRE
Pin
L1
L2
L3
L4
R1
Input signal connections
R2
R3
R4
LSEL0
Input selector outputs
RSEL0
LBA SS1
LBA SS2
Connections for the resistors and capacitors that form the bass band filters .
RBA SS1
RBA SS2
LIN
Volume control and equalizer input
RIN
LO U T
Volume and equalizer outputs
ROUT
LTRE
Connections for the capacitors that form the treble band filters .
RTRE
Connection to the 0.5xVDD voltage generator circuit used asthe analog signal ground.
Vref
Applications must connect a c apacitor of about 10 uFbetween this pin and Vss
to exclude power supply ripple .
Vss Ground
VDD Power supply
Chip enable
Data is written to the internal latch when thispin goes from high to low.
CE
The internal analog switches operate at this point.Data transfer is
enabled when thispin is high.
DI
Serial data and clock inputs used for IC control.
CL
Electronic volume and tone control testing
Vss
Thispin must be tied to Vss during normal operation .
Unused.
NC
These pins must be left open or connected
LBASS1 LBASS2 LOUT
7 6 5
4
3
LVref
2
CCB
1
INTERFACE
30
RVref
29
28
27
24 25 26
RBASS1 RBASS2 ROUT
Description
to Vss during normal operation .
- 7 -
TEST
V
SS
CE
DI
CL
V
DD
Vref
NC