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ADS1246 reference pin noise

richard gabric
Prodigy 10 points
Other Parts Discussed in Thread: ADS1246

I am intending to use the ADS1246. In choosing a reference, there is no clear specification for the noise. Is there a sound theoretical way of defining how reference noise effects the performance of the converter.

  • 0
    TI__Guru* 94285 points
    Richard,


    The ADC data is the a word that shows the ratio between the input measurement and the reference value. Because of this, if the reference is noisy, the noise is reflected in the input measurement.

    Note that the reflected reference noise is dependent on the input signal so that the noise is lowest when the input is close to 0V. When the input is at full-scale, the noise is the highest so that the output data reflects all of the noise of the reference. I talk about this effect in the following post:

    e2e.ti.com/.../1377080

    If you have any other questions, let me know.


    Joseph Wu