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INA128: Gain Error Question

Darren (FAE)
Expert 5483 points
Part Number: INA128

The datasheet specifies Gain Error for different conditions, and "vs" the U and UA part numbers.

Is the datasheet correct when it seems to indicate the "UA" part number has better max gain error than the "U" part number, for G = 1?

  • 0
    TI__Mastermind 48226 points

    Hi Darren,

    I see your concerns. Yes, it is odd one and I think that there is an typo in the field placement. U is higher grade than UA part number and it should have less gain errors.

    Based on the published CMRR specification, CMRR in G=1 is higher than UA grade, which is reflected in Min. of CMRR column, so I think that gain error field in G=1 in UA grade is likely a typo, which it may be swapped from the field in U grade. 

    Enclosed is an article talked about the requirements of well-matched internal resistors in the difference amplifiers, which are the front stage of 3-op amp instrumentation amplifiers. 

    https://e2e.ti.com/blogs_/archives/b/thesignal/posts/difference-amplifiers-the-need-for-well-matched-resistors

    If you have additional questions, please let us know. 

    Happy Christmas!

    Raymond