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ADF4360-2 + ADCLK-914 + AD9789

Question asked by Jacky.Lu on Sep 21, 2015
Latest reply on Nov 19, 2015 by danf


Hi,

Our application is DVB-C modulator,

The chip set adopted includes ADF4360-2, ADCLK-914 and AD9789.

We have a problem of bad RF quality for QAM-128 and QAM-256.

It looks fine when the constellation is QAM-64.

The situation is getting worse once the constellation and channel frequency go higher.

I am wondering if the clock quality of ADF4360-2 is not good enough to support QAM-128 and QAM-256.

 

Please provide some suggest.

 

Thanks.

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