TI Support Team,
Our customer is using LMH1983 and evaluating the Holdover Mode operation using the LMH1983 Evaluation Board.
In their evaluation, Holdover function is not working correctly when the reference input(REFIN) is disconnected from LMH1981 input.
VC_LPF voltage changes from 1.7V to 1.2V when REFIN is lost.
How come Holdover function does not operate correctly ?
Below are the evaluating condition.
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[Condition]
Uses LMH1983 Evaluation Board.
REFIN = Black Burst signal
Registers = Default (Soft Reset after power on)