1 of 1 people found this helpful
The relation between Compare time and Compare Clock cycle is;
Compare time (Tc) = Compare Clock Cycle (Tcck) × 14
For AVCC ≥ 4.5 V, minimum Tcck is 25 nS. Thus, minimum Tc turns out to be 350 nS (14*45 = 350 nS).
Hope it clarifies your query. Please ensure that sampling time and compare clock cycle meet the electrical characteristics of the A/D converter.