I'm looking for a DSP, around 500MHz, with an in-chip ADC (preferably 2 but 1 will suffice) that samples around 20MSPS. Does any such DSP exist or do I have to use external ADCs?

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    $\begingroup$ Those are pretty ambitious goals. You won't find many DSPs that run that fast that have integrated ADCs. In addition, I've never seen a CPU that had an ADC that can run as fast as 20 MSPS. Typically, DSP processors will contain a number of high-speed bus interfaces for interfacing hardware like ADCs. You might find that in order to support that high of a sample rate, you might need a more hardware-based approach using something more like an FPGA. $\endgroup$ – Jason R Sep 10 '13 at 2:33

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