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INA202: max distance to shunt restriction.

Juan Aparicio Jimenez
Intellectual 1930 points
Part Number: INA202

Team,

Is there any restriction about the max distance between the  Shunt and the 1NA202AQDGK?

If so, do we have some estimates?

thanks,

Juan

  • 0
    TI__Mastermind 19255 points

    Juan,

    We do not specify a maximum disatance, but please check out the highlighted video below on this very topic. General best practice is to keep the shunt traces as short as possible, and matched as well as possible. Longer traces can complicate the measurement by acting as unintentional antennae for noise and EMI artefacts. Longer traces also come with trace resistances and capacitive coupling that can increase error to the measurement. 

  • 0
    Guru 140200 points

    Hi Juan,

    too long input lines can add uneven stray capacitances from each input to signal ground and by this degrade the common mode rejection of INA202.

    Kai

  • 0 in reply to kai klaas69
    TI__Intellectual 1930 points

    Hello Carolus,

    Thanks for your answer!

    What is the INA bahaviour with temperature?

    Should we have any design strategy to minimize the temperature influence on the device?

    thanks,

    Juan.

  • 0 in reply to Juan Aparicio Jimenez
    TI__Mastermind 19255 points

    Juan,

    the device will vary slightly over temperature due to drift parameters in the device itself, as well as drift parameters in the shunt. Shunt choice is paramount here, as a wildly changing resistance over temp will result in additional error to the measurement.

    As for drift of the device, these can be found in the datasheet for various parameters. As an example, you can see the room temperature gain error spec vs. the gain error spec over temperature below: