![]() Note that the ADC input is actually a switched capacitor input this can present several design challenges as the capacitor has to be able to charge completely while also not affecting the circuit that it is connected to. See and for more details on how they work. I believe the Atmega microcontrollers use successive approximation, which require one ADC clock cycle per bit (so 10 clock cycles for 10 bits). At the end of the sampling time, the capacitor is disconnected and the charge stored is measured. No, during the acquisition time the converter connects a sampling capacitor in what is called a sample and hold circuit to the pin and charges it up.
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