Instead of the AD9983 I would recommend an ADV7842+ADV7511 type of platform. Advantiv™ EVAL-ADV7842-7511 Video Evaluation Board If you are an HDCP adopter you might consider the ADV7850.
The AD9983 is not recommended for new designs
I'm not familiar with the video parts or boards, but I did a quick search on our website and found this board which has the ADV7511W on it so it should be a good reference. (EVAL-ADV7612 Evaluation Board | Analog Devices )
The AD9983A is no longer recommended for new designs, so I'm not sure if that is the device you want to be using for a new set top box design.
I have moved this post into the video forum so the video engineers can help you directly.
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