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INA240: Gain error, nonlinearity error, and PVRR from -40°C to 125°C

Alfie Cheng
Intellectual 1990 points
Part Number: INA240

Hi team, could you help me with these question? thank you very much.

Q1. are nonlinearity error and PVRR in datasheet the value at normal temperature? what is its max value from -40°C to 125°C?

Q2: do how I calculate the max gain error at different temperature? is it 0.2%+(2.5*temperature/million)*100%?

Q3: can I use the below formula to calculate Gain error from -40°C to 125°C? it's not related to temperature?

  • +1
    TI__Mastermind 31000 points

    Hi,

    Q1: Nonlinearity and RVRR are for room temperature. There is no spec for max value from -40°C to 125°C. You can use typical for all calculations.

    Q2: Yes, essentially ±0.2%±(2.5*temperature/million)*100%

    Q3: The equation is intended for a rough estimation of gain error due to external input resistors. It can be used for any temperature. However, the number “3000” is a typical, equivalent resistance value at room temp. We don’t know how it changes with temperature. Therefore, the best we can suggest is to use the equation for all temperatures.  

    Regards, Guang