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Input impedance on SDADC pin of STM32F373

Question asked by filippini.igor on May 26, 2016
Hi, eveybody.
I read that the input impedance on a SDADC input should be from 47k to 640k (more or less) and depends on gain and clock frequency.
Let's suppose that a 100k ohm impedance is needed.

Can the input impedance of a SDADC input be like the one in the image?

MIS_Iout is the signal for the SDADC input.
I_OUT is a 0-5V signal that I need to reduce to the 0-3.3V range (because the Vref for the SDADC is 3.3V).