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INA199: Does Vsense affect gain error?

Yee Yong Teo
Expert 4335 points
Part Number: INA199

Hi,

in datasheet, we stated max gain error of 1.5% with Vsense = -5mV to 5mV. If Vsense = -30mV to 30mV, does it change the gain error?

Thanks.

- YY

  • 0
    TI__Expert 4915 points

    Hi Yee,

    The error does not change, but it goes down as current goes up.

    The reason the gain is specified at 5mV is because there is a small non linearity as the device approaches zero voltage and operates close to the rails. This is valid with any current amplifier/opamp, except those using a negative rail.

    The error with 5mV looks as below:

    The error with 30mV looks as below:

    As you can see the largest portion of the error is close to zero.

    The actual error in your application will depend where the majority of the current readings fall.