what is the ad8676 best voltage follower setup?

I want to use AD8676 in voltage follower mode, whats the best setup, is it just just simple voltage follower model? sometimes they add stabilising resistors and caps in the feedback loop and 100ohm at the input ...

DS doesnt specify it, I will be using it for the analog mux buffering for measurements.

  • hi Hary,

    thanks for response, in my case impedance that pos input will see is 10kOhm, since neg input will be in the feedback loop, will I need to place 10kohm in feeback loop for bias current compensation, (how the compensation really work, does it create opposite voltage to the one on the pos input and therefore it compensates ?) do i need 100ohm res in series on the pos input ? sometimes they use capacitor in the feedback loop, would i also need it ?

  • hi Hary,

    in fact I will be mostly using it for DC measurements, ADA4622-2, ADA4610-2 seem to have large offset, ADA4000-2 even bigger.

    Regards,

    Mike

  • Hi Harry,

    Thanks for your help on this.

    ADA4522-1 looks very promising, ibias=150p, vos=5uV, p-p noise =117n, and dual supply from -/+22V, which i willbe using +/-15 as my max signal is 12V.

    I think I may go with this one.

    One final thing on the feedback resistor, could you elaborate more on it please? is there way of calculating fb resistor once source impedance is known ?

    Best Regards,

    Mike