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Looking at this manual, http://www.ni.com/pdf/manuals/371235h.pdf

I see the following picture related to a DAQ board's ADC, enter image description here

Assuming all 4 ADC channels are used, how would multiple ADC channels be processed? Which of the following be more likely?

  1. The ADCs collects samples sequentially, i.e.: ADC 0 collects one sample, then ADC 1, then ADC 2, then ADC 3, then back to ADC 0 again, etc.?
  2. ADC 0 to 3 all collect samples simultaneously?
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    \$\begingroup\$ If it's important to your application, I'd ask NI. If we're just taking guesses, I'd say the ADCs would sample in parallel (option #2), otherwise why have multiple ADCs? A single ADC with a 4-channel mux would be a hundred times less complex. \$\endgroup\$
    – Jay Carlson
    Commented Jun 14, 2017 at 5:56
  • \$\begingroup\$ While not the case here (therefore not making this a dedicated answer) often one fast ADC is employed, and the channels are simply seperate track-and-holds that can be sent to the ADC with an analog multiplexer. \$\endgroup\$
    – Joren Vaes
    Commented Jun 14, 2017 at 8:17

2 Answers 2

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enter image description here

It's all stated in the linked documents inside the specification you listed.

How would multiple ADC channels be processed?

Many ADC systems however, would not take simultaneous samples. Read the data sheet for the ADC or sub-system you are considering.

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  • \$\begingroup\$ Thanks, I may have also confused separate ADC devices with different ADC channels within a single ADC. \$\endgroup\$
    – plu
    Commented Jun 14, 2017 at 8:57
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The spec sheet at http://www.ni.com/pdf/manuals/373770j.pdf says they are simultaneously sampled - which is what you would expect for a board designed for capturing acoustic type signals.

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