Pioneer PDP-503CMX Service Manual page 157

5
ML6426CS1 (RGB ASSY: IC4403)
LPF IC
Pin Assignment (Top view)
A/B MUX 1
R IN A/Y IN A 2
GND 3
V CC 4
R IN B/Y IN B 5
G IN A/U IN A 6
G IN B/U IN B 7
B IN A/V IN A 8
TOP VIEW
Block diagram
R IN A/Y IN A
2
MUX
R IN B/Y IN B
5
TRANSCONDUCTANCE
G IN A/U IN A
6
MUX
G IN /U IN B
7
TRANSCONDUCTANCE
B IN A/V IN A
8
MUX
B IN B/V IN B
9
TRANSCONDUCTANCE
A/B MUX
1
SYNCIN
16
Pin Function
PIN NAME FUNCTION
1 A/B MUX Logic input pin to select between
Bank <A> and Bank <B> video inputs.
This pin is internally pulled high.
2 R A/Y A Unfiltered analog R- or Y -channel
IN IN
input for Bank <A>. Sync must be
provided at SYNC IN pin.
3 GND Analog ground
4 V Analog 5V supply
CC
5 R B/Y B Unfiltered analog R- or Y -channel
IN IN
input for Bank <B>. Sync must be
provided at SYNC IN pin.
6 G A/U A Unfiltered analog G- or U-channel
IN IN
input for Bank <A>. Sync must be
provided at SYNC IN pin.
7 G B/U B Unfiltered analog G- or U-channel
IN IN
input for Bank <B>. Sync must be
provided at SYNC IN pin.
5
6
16 SYNC IN
15
DISABLE
14 GNDO
13 R OUT /Y OUT
12 V CCO
11 G OUT /U OUT
10 B OUT /V OUT
9
B IN B/V IN B
12
V CCO
+
ERROR AMP
–
+
ERROR AMP
–
+
ERROR AMP
–
DISABLE
15
6
7
4
V CC
4th-ORDER
2
FILTER A
0.5V
4th-ORDER
2
FILTER B
0.5V
4th-ORDER
2
FILTER C
0.5V
GNDO GND
14 3
PIN NAME FUNCTION
8 B A/V A Unfiltered analog B- or V-channel
IN IN
input for Bank <A>. Sync must be
provided at SYNC IN pin.
9 B B/V B Unfiltered analog B- or V-channel
IN IN
input for Bank <B>. Sync must be
provided at SYNC IN pin.
10 B Analog B or V-channel output
OUT
11 G Analog G or U-channel output
OUT
12 V 5V power supply for output buffers
CCO
13 R Analog R or Y -channel output
OUT
14 GNDO Analog ground
15 DISABLE Disable/Enable pin. Turns the chip off
when logic high. Internally pulled low.
16 SYNC IN Input for an external H-sync logic
signal for filter channels. CMOS
level input. Active High.
PDP-503CMX
7
8
R OUT /Y OUT
13
G OUT /U OUT
11
B OUT /V OUT
10
8
A
B
C
D
E
F
157