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INA2181: Nonlinearity error dirft consult

Lin_Charles
Expert 4260 points

Part Number: INA2181

Hi team,

Could you please help check the nonlinearity error dirft value and max nonlinearity error@25C? I cannot find these two value in the datasheet. Thanks.

BR,

Charles Lin

  • 0
    TI__Mastermind 35760 points

    Hi Charles,

    Unfortunately, these parameters are not specified. What is in the datasheet is what we have data for.

    I would assume that max is equal to typical, and drift equals to zero. These assumptions are obviously not true strictly speaking. But from a practical stand point, it is probably close enough.  

    Regards, Guang

  • 0
    Guru 140200 points

    Hi Lin,

    I would read the datasheet in a slightly different way:

    "To achieve highest linearity stay with the output voltage 0.5V away from the rails." :-)

    But I would not give this number too much importance. It's only typical data and will show some manufacturing tolerances and eventually some drift. Nevertheless, the number is hepful when choosing a suited ADC.

    Kai

  • 0 in reply to Guang Zhou
    TI__Expert 4260 points

    Hi Guang,

    Thank you for your response here.The reason why I ask this question is that I want to calculate the max error over temperature (-40C-85C) this device will contribute to system when I use this device to sense current.

    We only have gain error, gain error drift, offset error, offset error drift in our datasheet. I also need max Nonlinearity error, Nonlinearity error drift to calculate total error this device will have.

    Do you have any idea to get this result? Thanks.

    BR,

    Charles Lin

  • 0 in reply to Lin_Charles
    TI__Mastermind 35760 points

    Hi Charles,

    Nonlinearity was only characterized at room temperature, there is no over temperature data for either the max or drift. Like I initially posted, I would use the typical number for all calculation, room as well as over temperature.

    Regards, Guang