Datasheet

5.2.9. ADC[7:6] (TQFP and VFQFN Package Only)
In the TQFP and VFQFN package, ADC[7:6] serve as analog inputs to the A/D converter. These pins are
powered from the analog supply and serve as 10-bit ADC channels.
Atmel ATmega48PA/88PA/168PA [DATASHEET]
Atmel-42734B-ATmega48PA/88PA/168PA_Datasheet_Summary-11/2016
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