National Instruments AT E Series CONVERT* Signal

Chapter4 ConnectingSignals

ATE Series User Manual 4-38 ni.com

CONVERT* Signal

Any PFI pin can externally input the CONVERT* signal, which is

available as an output on the PFI2/CONVERT* pin.

Refert o Figures 4-13 and 4-14 for the relationship of CONVERT*to the

DAQsequence.

As aninpu t, theC ONVERT*signal is configured in the edge-detection

mode. Youcan select any PFI pin as the source for CONVERT* and

configurethe polarity selection for either ri sing orfalling edg e. The

selectededge of the CONV ERT*signal initiates an A/D conversion.

Asan output, the CONVERT* signal reflects the actual convert pulse that

is connected to the ADC, evenif the conversions are being externally

generated byanother PFI. Th eo utput is an activelow pulse with a pulse

width of5 0 to100 ns. This outputis s etto high-impedance at startup.

Figures 4-21 and 4-22 showthe input and outp ut timing requirements for

the CONVERT*signal.

Figure4-21. CONVERT* Input Signal Timing

Figure4-22. CONVERT* Output Signal Timing

Rising-Edge

Polarity

Falling-Edge

Polarity

tw=10 ns minimum

tw=50to150ns