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INA293: Capacitive Feedback

Part Number: INA293
Other Parts Discussed in Thread: INA239,

Hi,

My customer is considering using INA239.

Is the capacitive feedback method used for the internal amplifier.

They concern about interference for high impedance node of capacitive feedback by switching noise.

Best Regards,

Kuramochi

  • Kuramochi,

    Could you confirm it is the INA293 or INA239.

    The internal amplifier for the INA293 input stage is shown in the block diagram.

    The INA239 has an input stage that is capacitively coupled but the feedback I am not sure.  I would place a capacitor across the input to take care of any switching at the inputs.  These currents are very small and should not be an issue.  By high impedance node what value are you talking about.  I think if you place a 0.1µF at the input this may take care of any small currents required from the input.  Also you could add Rfilters seen in 8-1 figure in the datasheet.