"The ADC is optimized for analog signals with an output impedance of approximately 10 k? or less. If such a source is used, the sampling time will be negligible. If a source with higher impedance is used, the sampling time will depend on how long time the source needs to charge the S/H capacitor, with can vary widely. The user is recommended to only use low impedance sources with slowly varying signals, since this minimizes the required charge transfer to the S/H capacitor."
... knowing that the Analog input of the Arduino board (UNO, DUE, Leo, etc.) has a non infinite internal resistance (I have measured values between 300K to 1M) ...
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via Egeo 16