The data sheet for AD8338 does not specify the impedance on the GAIN control input pin. Hoping someone can provide that information.
The gain control input pin has a high impedance. Its impedance depends on the voltage at gain pin. Actually this pin has a leakage current of 10nA. So at a minimum input voltage of 0.1V, it has an impedance of 10 MΩ and for a maximum input voltage of 1.1V it has an impedance of 110 MΩ.
By the way, can I ask what is your application?
I hope this helps.
Thanks for getting back. My application is liquid/gas flow measurement. One more question: Where can I find a pdf of the AD8338-EVAL gerber pcb files?
Please see the attached file and let me know if there is anything else needed.
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