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long term gain drift of the INA132

Roger Liang
Expert 3510 points
Other Parts Discussed in Thread: INA132

A customer is asking the following question about the INA132.

 

Can you get me data on long term gain drift of the INA132? Not pass/fail test data but real measurements? I need to estimate system 1 year accuracy and make recommendations about how often to recalibrate to stay within specs.

 

Thanks,

  • 0
    TI__Mastermind 25805 points

    Hello Roger,

    All long-term stability specs are guaranteed by a life-test during the initial introductory phase of the project when a large sample-size of the new parts undergoes accelerated aging process in high temperature ovens.  The life-test simulates (or is equivalent to) 10-year aging process and the shift of various parameters during the life-test is used to set the maximum guaranteed specs at room temperature. 

    Here are the gain specifications from the PDS:

    For the INA132PA, the initial error is +/-0.1%.  In addition to that, you will need to add 1/10th of the maximum error to approximate 1 year of shift.

    You need to keep in mind, however, that the long-term shift is not quite linear - it is steeper in the fist few years and slower in the later years and it usually excludes first month due to continuing self-curing of the molding compound used for packaging