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INA186: Input bias current reduction

TonyMCC
Intellectual 750 points
Part Number: INA186

Is it possible to reduce the input bias current of the INA186 using the following methods...

1. Disabling the device with the ENABLE pin ?

2. Switching off the power supply at the pin 1 (VS) (using an analog switch).

Thanks.

  • 0
    Guru 140200 points

    Hi Tony,

    have you seen figures 6-6 and 6-7 of datasheet?

    Kai

  • 0 in reply to kai klaas69
    Intellectual 750 points

    Thank you Kai. 

    The Figure 6-7 is exactly what I was looking for but must have overlooked it.

    So for my future reference...would the residual leakage when the device is disabled be due to INA186 input ESD protection ?

    Also...would removing the power rail from the VS pin have any additional affect in reducing bias current any further ?

    Thanks.

  • +1 in reply to TonyMCC
    TI__Mastermind 31010 points

    Hi Tony,

    Glad you found figures 6&7 helpful (thank you Kai!). Regarding the other questions, I agree the residual would be mostly due to ESD cells. But the input circuitry likely can’t be completely cut off either.

    I don’t think removing power supply will help with reducing Ib further.

    Regards, Guang