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INA240: what is the accuracy of the internal 50k ohm resistor?

Part Number: INA240

Customer is asking for the accuracy of the internal 50k ohm resistor for REF1 and REF2? Could you help address it? Thank you.

  • Hi Aki,

    due to production tolerances from wafer to wafer the internal resistors can usually show an absolute tolerance of +-/20...30%. But the ratio of all involved resistors of the internal differential amplifier is ultra precise offering an outstanding common mode rejection of 132dB!!! Keep in mind, that with discrete components a common mode rejection of only 60...80dB is achievable (at the best, with very expensive components and annoying calibration procedures). So, TI's INAs are state-of-the-art.

    Kai

  • Hi Aki,

    Kai put it very well, these internal resistors are made to match very well, however their absolute values may not be as accurate. It is good practice to assume a large range of variation when absolute values are considered, unless the data sheet specifically says otherwise.

    Regards, Guang