AN5466

1.1.1 Frequency Tracking Mode

JAPLL enters the frequency tracking loop after reset and starts sampling inputs FIN and FFB. Once the frequency of FIN is within 5000 ppm of the frequency of FFB, FLOCK sets to 1 and the JAPLL transits to phase tracking mode and TRANSITION sets to "1". The frequency tracking loop continues to function while in phase tracking mode.

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