[SI-LIST] Analog&Digital Power planes

Hello SI Experts ::
 
We have three PCb cards in our system.The first one  is a FPGA board and 
the second board is a analog front end card and contains a)D to A 
converters b)A to D converters and the third board is a RF Transceiver 
board.The "D to A" coverter gives input to the RF board and the "A to D" 
converter gets its inputs from the RF card.
 
The power supply to the second board is given from the first board.Now on 
the second board the power planes are split into two planes a) Analog 
supply plane and 2)Digital supply plane.Both the planes are joined at a  
single point through a RF beed.
 
similarly the grounds are also split into two planes and joined at a single 
point.
 
QUEST::The power supply comming from the FPGA card needs to be taken as 
Digital power or the Analog power for the second card.Can somebody pls try 
and  reason it out.
 
Best Regards
-- 
suresh
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