CV-M77
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5.4. Input output Circuits
In the following schematic diagrams the input and output circuits for video and timing signals
are shown. For alternative connections refer to
“7. Configuring the Camera”.
Jumper settings
are shown as for factory default.
RGB video output
The video output signal is a RGB video signal.
The signal level is 0.7Vpp from 75
Ω
. The video
output is DC coupled.
Composite sync. is selectable on the green
video signal via software or the internal switch
302-3. The sync. signal level is 0.3Vpp.
Iris video output
A video signal for lens iris control is found on
pin 4. 12-pin connector. The signal is with
composite sync. It is ac coupled from a 75
Ω
source. It can only be used for iris control in
normal continuous mode.
Fig. 6. Video outputs
Trigger input
The trigger input is AC coupled. To allow a
long wide pulse width, the input circuit is a
flip-flop, which is toggled by the negative and
positive differentiated spikes cause buy the
falling and rising edge. The input signal level
is 4V
±
2V. The trigger input impedance is 1.2
k
Ω
or 75
Ω
selectable via the internal switch
S301-3.
Fig. 7. Trigger input
HD and VD input
The HD and VD input circuit can be 75
Ω
terminated via the internal switch S301-1 and
S301-2.
The input signal level is 4V
±
2V.
Fig. 8. HD and VD inputs
HD, VD, PCLK, WEN and EEN output
The output circuits for these signals are 75
Ω
complementary emitter followers. The single
circuit delivers a TTL signal. The output level
≥
4 V from 75
Ω
(no termination).
Fig. 9. HD, VD, PCLK and EEN output
DC level with
75
Ω
termination
GND
75
Video
Output
400 mV
DC level with
75
Ω
termination
GND
75
Video
Output
GND
75
Video
Output
400 mV
GND
75
Iris
Video
GND
75
Iris
Video
