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INA827: tolerance of internal resistors

James Arient
Prodigy 10 points
Part Number: INA827

What is the tolerance of the internal 8k, 10k, and 50k resistors?

Most parts measure, the sum, 68k about perfectly.  At least within 5%.

Some parts measure about 75k ohms or more

  • 0
    Guru 140200 points
    Hi James,

    the 8k resistors should be very precise because they determine the gain and the specified gain error of INA827 is <+/-0.4%.

    For the 10k and 50k resistors it's only important that they show a very precise and matched ratio. This ratio determines how good the common mode rejection ratio is. But their absolute values are irrelevant in the differential amplifier stage.

    Kai
  • 0 in reply to kai klaas69
    TI__Genius 11135 points
    James

    We haven't heard back from you so we assume this answered your question. If you need additional help just post another reply below.

    Thanks
    Dennis