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Original question:

INA240: About current sense amplifier

INA240: INA240A3 internal resistance value

Yosuke Ishisaka
Prodigy 10 points
Part Number: INA240

Tool/software:

Could you tell me the Ri and Rf value in the INA240A3?

I know the ratio Rf/Ri = INA240A3_Gain =100 [V/V].

  • 0
    Guru 317250 points

    You could try to deduce the resistors from the typical input bias currents:

    But exact values are not guaranteed, and not even trimmed. Trimming is done only to get an exact 1/100 ratio.

  • 0
    TI__Mastermind 32290 points

    Hello Yosuke,

    Also there are some other circuitry no shown.  So if you can explain the problem you are trying to solve then maybe I can address that.  Also simulation are a good place to do some initial debug on what you are trying to understand how the device would function in your application.  

    Regards,

    Javier.