User`s guide

58 • Operation Theory
4.5.3 External Digital Trigger
An external digital trigger occurs when a rising edge or a falling edge is
detected on the digital signal connected to the EXTDTRIG or the
EXTWFTRG of the 68-pin connector for external digital trigger. The
EXTDTRIG is dedicated for A/D process, and the EXTWFTRG is used for
D/A process. Users can program the trigger polarity through ADLINK’s
software drivers easily. Note that the signal level of the external digital
trigger signals should be TTL-compatible, and the minimum pulse is 20ns.
Figure 45: External digital trigger