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Page 15

TM-75/76 External Signals

TM-75/76 High-Resolution CCD Camera

4.5 Trigger Pulse for Pulse-Width Shutter Control

In pulse width shutter control mode, the leading edge and trailing edge of TRIG must be synchronized

with external HD. The duration must be longer than 1H. If TRIG does not meet these conditions, the

exposure time may vary depending on the trigger position in one ﬁeld to another ﬁeld.

FIGURE 7. Proper Pulse Width Control

FIGURE 8. Improper Pulse Timing for Width Control

4.6 Trigger Pulse for Snapshot Shutter Control (Donpisha Mode... No Delay Shutter)

For snapshot mode (Donpisha shutter), the TRIG pulse width can be wider than just 2 pixel clocks wide

(>150nsec) since this mode only requires pixel clock data strobing. The internal TRIG is generated at

any random point and stays high until transfer gate pulse is completed.

EXT. HD

TRIG

EXT. HD

LCLCK

Sampling

TRIG A

TRIG B

DISCHARGE

TRANSFER GATE

Exposure Time A

Exposure Time B

1H delay after detection of falling edge

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