Lock time reduction in AD9549

Hi,

My customer used AD9549 in holdover mode.

She wants to reduce the re-locking time of AD9549 when REF_IN was supplied again after that did not been for a while.

1. Could you recommend a method to reduce the re-locking time in AD9549 except for changing internal loop filter bandwidth or Icp ?

2. Please recommend a new device that can set holdover mode and a shorter re-locking time than AD9549.

Thanks.

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