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Chroma PM noize for ADV7180 and ADV7343


My customer has a question for ADV7180 and ADV7343. When they use these device and pass through the video data at 656 format, PM specification of Chroma noize was not good.

It can see around 35dB to 45dB. they can see AM spec is good (it can see around 55dB to 65dB). Even if they enabled SFL signal, this value was not changed. Also, even if they improved power stability, the result was not changed.

At competiter chip, they can see good performance (it can see around 55dB to 65dB at both of PM and AM spec).

Do you have any solution for the improvement of a noize spec? or do they need any register setting?