User`s guide

Operation Theory

57
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 of the 68-pin
connector for external digital trigger. The EXTDTRIG is dedicated for A/D
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