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ADS8588S: sampling operation

Y.Ottey
Mastermind 6145 points

Part Number: ADS8588S

Dear all,

I would like to ask a question about the sampling method of this device.

Is it possible to sample by skipping channels as needed instead of continuously sampling from CH1 to CH8?

For example, Sample in the following order. CH1 → CH2 → CH5 → CH8

Best Regards,

Y.Ottey

  • 0
    TI__Mastermind 49205 points

    Hello Y.Ottey,

    ADS8588S is a simultaneous-sampling ADC, CONVSTA signal is used to simultaneously sample and initiate the conversion process for channels 1-4, CONVSTB signal is used to simultaneously sample and initiate the conversion process for channels 5-8. One way to sample the four channels is using either channel 1-4 or channel 5-8 for your signals if possible, otherwise, a simple solution is to throw away the data of unwanted channels in software.

    Thanks&Best regards

    Dale

  • 0 in reply to Dale Li
    Mastermind 6145 points

    Hi,Dale

    Thank you for your reply.

    I would like to ask more question about output of ADS8588S.

    If only CH1 to CH4 are AD converted (CONVSTA = High, CONVSTB = Low), the serial output data is considered to be only 4CH as shown below. With this idea, the AD conversion time (processing time) is about half of the conversion time when 8 channels are sampled simultaneously.

    Is this correct?

    I would appreciate it very much if you could reply as soon as you can.

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Mastermind 49205 points

    Hi Y.Ottey,

    This is a data reading timing. When you send 4x16=64 SCLKs to ADC, you will get the data for CH1-CH4. If more SCLKs are sent to ADC, nothing will be gotten with the rest of SCLKs because the CONVSTB is low. I hope this is clear for you.

    Thanks&regards

    Dale