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