FPGA-DAC PCB Design

Hi Daixiwen and thanks for your reply.

Seems like I m gonna do separated ground planes and use some extra capacitors for the PLL power pins. Another thing that is not clear is whether to connect AGND and GND pins of mixed-signaled IC's to the same (analog) part of the ground plane or to their corresponding ground planes. Any suggestions on that? Finally should I connect the two separated planes at a common point or can I let them completely separated if I use separated Power jacks for each?

thanks a lot,

Lambros