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ADS1262EVM-PDK: Sampling rate and number of samples when using ADCPro.

user6228517
Prodigy 20 points

Part Number: ADS1262EVM-PDK

I want to acquire data with ADCPro using ADS126xEVM-PDK.

For example, I want acquired a 100-second sample in sampling rate of 400Hz.
When the sample of Data recorder is set to 40000, 40152 data will be recorded.
It is 115.280 seconds at estimated income time.

How can I acquire 100-second data at 400Hz?

Please excuse my poor English.
I would appreciate it if you could tell me about that.
  • 0
    TI__Mastermind 44550 points

    Hi user6228517,

    Welcome to the TI E2E Forums.

    ADCPro and the MMB0 unfortunately behave a bit oddly when sampling data... When requesting a specific number of samples, the software will usually capture some additional data to ensure that at least as many samples as requested are provided. If you only need 40,000 samples, then you could truncate the extra data from the recorded data file.

    The capture time may also be a little longer than expected, as the data is first collected into memory and then transferred up to the PC and analyzed. The transfer time and analysis require additional time to complete.

  • 0 in reply to Christopher Hall
    Prodigy 20 points

    Hi Chris.

    Thank you for the response.

    When 400SPS is selected in Filter Setting, Data Rate is set to 391.8Hz.

    Is it certain that the data obtained is at a sampling rate of 391.8Hz?

    Thank you very much for your help.

    Yushi.H.

  • 0 in reply to user6228517
    TI__Mastermind 44550 points

    Hi Yushi,

    I believe ADC1 may have CHOP enabled. If you turn chopping off then you should get a continuous data rate of 400 SPS. With chopping enabling, there is a small delay each time the input polarity is switched with slightly reduces the continuous data rate.