Get a (better) news client. Even Outhouse Express (Outlook Express) is ok by comparison. You need to have proper quoting.
Now that is off my chest, I suspect that neither of these chips will do what you need directly.
The Nordic Semi device seems to be designed around a 100 ms sample rate.
The fastest data transfer rate of the Micrel is 128 kb/s. Far less than the speed it comes out of the FPGA. What is the timing between 48-bit packets from your source again?