Hi Siva,
The performance of the ADV3201 can be severely degraded by insufficient power supply decoupling so it is important to pay close attention maintain a low supply impedance over the broad frequency range of the signaling frequencies. In terms of total # of capacitors, the evaluation board may be a bit over-designed. I guess it's easier to remove caps than it is to add them!
As a general minimum guideline, I recommend the following:
* One 0.001uF and one 0.0047uF per supply pin. ~40 caps These should be low ESL and placed as close in to the supply pin as possible.
* One 0.01uF - 0.047uF for every other supply pin. ~20 caps
* One 0.1uF for every 4th supply pin ~10 caps
* A mix of 10uF and 1uF, ~ 5 ea. Placement of the large value caps is not critical
If you have space (especially close in to the supply pins), it can't hurt to add in extra decoupling even if you leave unpopulated.
An inter-plane capacitor constructed from adjacent solid power/ground layers in the pcb stackup can be another beneficial way to add additional high-frequency decoupling.
Please be sure to pay close attention to decoupling for VREF, VCLAMP and DVDD.
The MT-101 tutorial may be helpful as well.
Dave