capacity time of charging

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Alex9

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How to define time of charging of input capacity of ADC (it is designated as C4 on the diagram of connection of a thermal sensor to the microcontroller) ? I attach the general diagram and the equivalent circuit which I simulate.
 

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I think you are just going have to derive the equation for voltage on C4. All the other impedances in your circuit are going to figure into the equation.
 

Alex9 said:
How to define time of charging of input capacity of ADC
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The essential time constant is R3C4 = 80ns. For a 1 of 8bit (in)accuracy you need ≈5.5 time constants, i.e. ≈ 0.5µs
 

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