To reduce the power supply interference of AD conversion, Mega16 chip has independent AD power supply. The official document recommends connecting a 10uH inductor (L1) in series with VCC, and then connecting a 0.1uF capacitor to ground (C3).
Mega16 has a built-in 2.56V standard reference voltage. You can also input the reference voltage from outside, such as using a TL431 reference voltage source. However, for general applications, the internal reference voltage is sufficient. It is customary to connect a 0.1uF capacitor to ground (C4) at the AREF pin.
Important note: In actual application, if you want to simplify the circuit, you can connect AVCC directly to VCC and leave AREF floating. That is, this part does not require any peripheral components.
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