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4. Timing Signals
4.1 External Synchronization and Gen-lock
When the camera is in NRM mode, the USS-300/USS-301 camera automatically locks to the external sync
source. The external sync source must match the camera HD and VD specification, which are 15.734KHz and
59.94Hz respectively. Both external HD and VD are TTL level signals.
a) HD
H:
2.5V to 5V
L:
0V or GND
Pulse width:
5-50% duty cycle, see figure 10 shown below.
b) VD
H:
2.5V to 5V
L:
0V or GND
Pulse width:
0.5-50% duty cycle; must be RS-170 format (odd and even fields).
Figure 11. External Synchronization and Gen-lock Timing
4.2 Integration
The USS-300/USS-301 camera can be integrated up to 2 seconds without severe noise or dark current effect.
Make sure the camera is set to NRM and FRM before preceding any integration; this will ensure that there will be
a full frame video (both odd and even field). To start integration, pin #11 of the 12-pin connector must be
connected to GND or 0V. The integrated video will be shifted out following the next vertical drive after pin #11
goes back to high or 5V level, as shown in figure 11 below. If a frame grabber does not capture the immediate
two fields or integrated video, the normal video (before the integration) will display again on the monitor.
Figure 12. Integration Control Timing
