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ADF4118 phase alignment across frequency changes

Question asked by stevehubbard on Jun 29, 2018

If I update the N counter register with a new frequency one step up from where it is currently locked, do the counters continue to count in close phase alignment? I am aiming to generate a stepped frequency ramp with well behaved frequency changes, that is say without phase discontinuities or skipped cycles. Is it better to reset the counters and/or tri-state the charge pump each time? ADIsimPLL indicates that that the phase error should remain small during a single step change. Thanks

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