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ADS1247: data rate error definition? estimation of error in a conversion?

AnBer
Mastermind 29965 points
Part Number: ADS1247

Team,

In the data sheet on page 18, the "Data rate error" is indicated in a diagram:

-Could you please clarify the meaning?
-Is this the error that is caused exclusively in the digital area of the ADC? or is it the sum of all error chains in the complete component?
-How is this error rate obtained? Is it characterized on a given lot of ICs? or is it based IC design parameters or simulation?
-Is the below understanding correct and correspond to our definition of "Data rate error"?
    1V analogue voltage at the input results in a digital value at the output at DVDD=3.3V and 50°C, which corresponds to 0.995V?
-Are there other errors on the analogue side added to this error (tolerance of the reference voltage, gain error, etc.)?
-Any documents/app note you could share in order to calculate the overall errors on the measurements?

Thanks in advance,
A.

  • 0
    TI__Mastermind 48571 points

    Hi AnBer,

    The "data rate error" is just describing how the actual ADC data rate changes with temperature. Really, this is describing how temperature affects the ADC internal oscillator accuracy, which directly affects the data rate.

    For example, if the data rate is 1000 SPS, and there is an oscillator error of -1%, the actual data rate will be 990 SPS.

    This has nothing to do with DC error calculations e.g. offset, gain error, linearity, reference error, drift, etc.

    -Bryan