COMPOSITE
SYNC OUTPUT
(Pin 1)
C SYNC
-
VIDEO
INPUT
(Pin 2)
-
+
V 1
V 2
+
10k
-
+
HORIZONTAL
OUTPUT
WINDOWING
CIRCUIT
(Pin 7)
85µ
11µ
NOSYNC
B PEN
V
CC
VERTICAL SYNC
OUTPUT
D
(Pin 8)
Q
Q
VOLTAGE
REGULATOR
VERTICAL
DETECTOR
(PIN 3)
CLK
BACK PORCH
OUTPUT
1.2V
(Pin 5)
R_SET
(Pin 6)
BACK PORCH
DETECTOR
TIMING
CURRENTS
Fig. 19 GS4981 Block Diagram
525
1
2
3
4
5
6
7
8
COMPOSITE
VIDEO INPUT
COMPOSITE SYNC OUTPUT
GS1881, GS4881, GS4981
BACK PORCH OUTPUT
GS4881, GS4981
BACK PORCH OUTPUT
GS1881
HORIZONTAL OUTPUT
GS4981
VERTICAL SYNC OUTPUT
GS1881, GS4881, GS4981
ODD/EVEN OUTPUT
GS1881, GS4881
600ns
2.5µs
COMPOSITE
VIDEO INPUT
BACK PORCH
OUTPUT
2.5µs
500ns
Fig. 20 GS1881, GS4881, GS4981 Video Sync Separator Timing Diagram
520 - 23 - 03
10
GENNUM [ GENNUM CORPORATION ]
