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5.4 Input and Output Circuits
In the following schematic diagrams the input and output circuits for video and timing signals are
shown. For alternative connections refer to "Internal Switch and Jumper Settings". Jumper
settings are shown as for factory default.
5.4.1
Video input
The video output signal is a 75
signal. The signal level is 0.7Vpp.
Composite sync. is selectable on the green
video signal via software or the internal switch
302-3. The sync. signal level is 0.3Vpp.
5.4.2 Trigger input
The trigger input is AC coupled with a flip-flop.
The input signal level is 4V
The trigger input impedance is 1.2 k
selectable via the internal switch S301-3.
5.4.3 HD and VD input
The HD and VD input circuit can be 75
terminated via the internal switch S301-1 and
S301-2.
The input signal level is 4V
5.4.4 HD, VD, PCLK, WEN and EEN output
The output circuits for these signals are 75
complementary emitter followers. The single
circuit delivers a TTL signal. The output level
4 V from 75
(no termination).
CV-M77
RGB video
2V.
or 75
2V.
- 9 -
SC104V
Trigger
input
SC102V
75C
S301-3
SC104V
HD, VD
input
SC102V
75C
S301-1(HD),2(VD)
220B
TTL
+5V
33KB
33KB
1K8B
100KB
SC102V
+5V
33KB
1K8B
+5V
Int VD
10KB
Int HD
PCKL
WEN
EEN
120C
150C
10KB
GND
GND
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