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[FAQ] REF54: How do I calculate the worst case error for my series voltage reference?

Jackson Wightman
Expert 3900 points
Part Number: REF54
Other Parts Discussed in Thread: REF70, REF35, REF4132

Tool/software:

I need to calculate the worst possible error for my series voltage reference to help with my ADC gain error calculations. How is that done, and are there any resources to help me with that calculation?

  • 0
    TI__Expert 3900 points

    Hello,

    To calculate the worst-case or maximum error, you must consider the sum total of the various errors of a voltage reference as they are outlined in the datasheet. Specifications such as initial accuracy, temperature drift, long-term drift, and others are amongst the most important to consider. Here is an online calculator tool that can aid in error calculations for your voltage reference:

    https://dev.ti.com/gallery/view/LPVRS/ADC-TO-VREF-SELECT_Design_Tool/ver/1.0.0/

    More information on how these calculations are done can be found in this application note:

    https://www.ti.com/lit/an/snaa320b/snaa320b.pdf

    Highest precision voltage references, such as REF50, REF54, or REF70 from TI, will provide the least amount of gain error for any high precision ADC because of their low drift and high accuracy. However, lower power references such as REF35, REF34, and REF4132 can also provide a precise and accurate voltage reference for low power applications and other ADC use cases.

    Thanks,

    Jackson