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Appendix B Timing Signal Information
NI PXI-4224 User Manual B-10 ni.com
AI HOLD COMPLETE Signal
AI HOLD COMPLETE is an output-only signal that generates a pulse with
the leading edge occurring approximately 50 to 100 ns after an A/D
conversion begins. The polarity of this output is software configurable, but
the polarity is typically configured so that a low-to-high leading edge can
clock external analog input multiplexers that indicate when the input signal
has been sampled and can be removed. This signal has a 400 to 500 ns pulse
width and is software enabled. Figure B-12
shows the timing for
AI HOLD COMPLETE.
Note The polarity of AI HOLD COMPLETE is not software selectable when
programmed using NI-DAQmx. It is a positive polarity pulse.
Figure B-12. AI HOLD COMPLETE Signal Timing
t
w
= 400 to 500 ns
t
d
= 50 to 100 ns
AI CONV CLK
AI HOLD COMPLETE
t
d
t
w