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INA826: Capacitance on INA826 gain setting pin

TKO
Prodigy 225 points
Part Number: INA826
Other Parts Discussed in Thread: MUX509,

Hi,

I'd like to hear your opinion on what kind of performance effect(if any) an additional capacitance on gain setting pins will have? I plan to use an analog mux like MUX509 to switch between different gain resistors. The additional capacitance on pins 2 and/or 3 could be anything between 10pF to 100pF.

Thanks, TKO

  • 0
    TI__Guru 68541 points

    TKO,

    The gain of the INA826 is set by the value of RG resistor and thus any significant capacitance across RG may limit the usable bandwidth for any given gain - see below.

    Please calculate the R||C cut-off frequency for a given gain and the input cap and compare it to specified bandwidth to make sure it will not be effected (gain will increase) by addition of the capacitance across the gain setting resistor - see below.