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AD9788 REFCLK Specification

Hi , 

I have a question with regards REFCLK specification.

We are using REFCLK of 112MHz and we are generating this from clock source that stabilizes to ±5×10^-6(±5ppm) after 2 min of power-up.

And we are setting the DAC  before 2 min and we are not able to see any output . But when we send the DAC setting once again we are able to see the output.

When there is no output, there is no problem with PLL_LOCK.

Please let me know if there is any detailed specification for REFCLK

Thanking you 

With best regards 

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