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AD9789 RF outputs big noise at start up

Question asked by david1234 on May 27, 2016
Latest reply on Jul 28, 2016 by danf



We us AD9789 as upconvertor and dac. We find that AD9789 RF outputs big noise at start up. The detail is:


After power up and reset, according to System start-up Sequence:

step 1

Enable the clock receiver and set the clock CML.

Enable duty cycle correction.

Then RF outputs big noise. From spectrum analyzer, DC to about 700 Mhz has high spectrum.


after finish step 4

Set up mu controller

RF spectrum is clear.


How to prevent RF start-up niose?