CV-M4+/M4+CL, CV-M7+/M7+CL
5.4. Input and Output Circuits
5.4.1. Video output |
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The analogue video output without composite |
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sync is a 75 Ω DC coupled circuit. It is for test |
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only. It can be used for iris control if the |
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camera is in normal mode. The video black level |
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is 0.5 volt without termination. The video is |
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without composite sync. |
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Analogue video in partial scan is only valid for the scanned area.
Video
Output
#4/12
GND
Black level
GND
500 mV
Important note on using this signal for iris control.
The signal for iris video output is taken from the video signal after the gain control. If it is used for auto iris control, the digital output video level can only be adjusted with the lens level adjust. The camera gain adjust will only change the working point.
Fig. 5. Video output.
5.4.2. Trigger input Multi Shutter input
The trigger inputs on the 12 pin Hirose connector is AC coupled. To allow a long pulse width, the input circuit is a flip flop, which is toggled by the negative or positive differentiated spikes caused by the falling or rising trigger edges.
The trigger polarity can be changed. Trigger input level 4 V ±2 V.
The
Trig input pin #10 |
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Multi shut pin #11 |
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100n | 1k | TTL | |
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10k |
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GND | 1n | 1k | |
GND | |||
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Fig. 6. Trigger input.
5.4.3. Composite Sync output
On pin #9 on 12 pin HR connector EEN or composite sync can be output. (Command SE). The output circuit is 75
Ωcomplementary emitter followers. It will deliver a full 5 volt signal.
Output level ≥4 V from 75Ω. (No termination).
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TTL |
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Fig. 7. Composite Sync. output
5.4.4. LVDS interface
For LVDS the digital input and output signals follow the EIA 644 standard. It is also called Low Voltage Differential Signal (LVDS). The output differential line driver is NS type DS90C031, and the line receiver is NS type DS90C032.
Typical LVDS output level is ±350 mVolt differential. Typical LVDS input threshold is ±100 mVolt differential. Typical LVDS line impedance is 100 Ω.
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