C SYNC
VIDEO
INPUT
(Pin 2)
-
-
V1
COMPOSITE
SYNC OUTPUT
(Pin 1)
+
-
10k
+
V2
+
WINDOWING
CIRCUIT
HORIZONTAL
OUTPUT
(Pin 7)
11µ
85µ
NOSYNC
B PEN
V
CC
(Pin 8)
VOLTAGE
REGULATOR
1.2V
D
Q
VERTICAL
DETECTOR
VERTICAL SYNC
OUTPUT
(PIN 3)
CLK Q
BACK PORCH
OUTPUT
(Pin 5)
BACK PORCH
DETECTOR
R_SET
(Pin 6)
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
500ns
2.5µs
Fig. 20 GS1881, GS4881, GS4981 Video Sync Separator Timing Diagram
520 - 23 - 03
10
GENNUM [ GENNUM CORPORATION ]
