ADC Input Resistance?

[AsYouWishEngineer]

Hello,

We are developing a fairly senstive sensor and need to know the input resistance on ADC 1 pins.

I have seen on the forums that the internal pullups/pulldowns are between 10k and 100k, but I was hoping there was some more specific information, perhaps about the input resistance of the ADC 1 itself (instead of the PU/PD resistors).

Thank you!

[bobtidey]

I think the ADC inputs have the same characteristics as the normal IO pads

https://www.espressif.com/sites/default ... eet_en.pdf

e.g. 50nA max leakage current