ISL4089_06 Datasheet, PDF (8/9 Pages) Intersil Corporation – DC-Restored Video Amplifier

ISL4089
R4
475 ohms
R5
475 ohms
VIDEO
INPUT
Composite Sync
Out
C4
0.01uF
R3
75 ohms
1
IN-
2
IN+
3
Vref
4
Hold
ISL4089
-
+
+
Vertical Sync
Out
EL1883
1
8
C5
0.1uF
2
7
3
6
4
5
V+
Vout
NC
GND
R7
681K
C2, C3
0.1uF
R6
75 ohms
+5V
C1
4.7uF
Ground
Out
Back-porch Clamp
Out
C6
0.056 uF
Horizontal Sync
Out
FIGURE 14. APPLICATION CIRCUIT USING THE EL1883 SYNC SEPARATOR TO GENERATE DC-RESTORE HOLD CONTROL
COMPOSITE VIDEO INPUT
0VDC
COMPOSITE SYNC INPUT
0VDC
DC-RESTORED VIDEO OUTPUT
0VDC
FIGURE 15. DC-RESTORE USING COMPOSITE SYNC AND V_REF = 0VDC
8
FN6192.1
June 28, 2006