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AREF input resistance

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In many threads I’ve read warnings about resistors, the AREF pin input resistance, and the possibility that the reference voltage may be affected.

I’ve found a mention of the reference input resistance in the ATmega328 datasheet:

And here is a diagram of the ADC:

Now my question is : where do I picture that 32kOhm resistor? Hard to mitigate it if I don’t know that.

And the next question: how accurate is that value?

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