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XTR305: What is the accuracy of the feedback IA-related circuit？

user6197310
Prodigy 170 points
Part Number: XTR305

The formula on page 26 of the manual is as shown in the figure below.What is the accuracy of Via in the figure?

  • 0
    TI__Mastermind 25433 points

    Hello,

    The accuracy of VIA will largely depend on the RIA and RGAIN resistor tolerances. For example, if you used 1% resistors, worst case RIA would be 1% high and RGAIN would be 1% low, which would lead to an error of 2%. The IA in the XTR305 has low offset voltage and drift. Page 8 of the XTR305 datasheet shows the Electrical Characteristics for the IA, including the offset error (typical 0.7mV) and gain error (typical 0.04%) of the IA. These errors will also be present the accuracy of VIA.

    Best,

    Katlynne Jones