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ADS7947: Single Conversion with Channel Select

Don Schelle
Expert 4150 points
Part Number: ADS7947


Hello,

I'm trying to pin down how to get a single sample out of the ADS7947 when using the channel select.   Sample rate is not important (1ksps), but device operation is.    From what I can see, you would select the desired channel (via GPIO), and then read out two samples.    The first sample would be thrown away (because it was acquired at some point in the distant past), and the second would be the relevant data.   I've attached a sample timing diagram below.    

Please confirm that my understanding is correct.

Many thanks.

Don

  • 0
    TI__Expert 5575 points

    Hi Don

    If you are operating in16 clock mode then data you receive is for the previous sample conversion.

    When you enter to 32 clock mode then data output you receive is for current sample conversion.

    If we refer to timing diagram shown above, device will output data from previous conversion (sample N-1 and sample N) in 32 clock frame shown above.

    For sample N+1, device will output zeros for first 16 clocks and conversion data for sample N+1 from 17th clock

    So what you are saying is correct

    Thanks & Regards

    Abhijeet