James Waldby wrote: ...
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Now I see from an earlier post you said 50ns instruction time;
20 MHz would give about 125000 loops per second max. Also, I seem to recall you wrote something about using R-2R with 1% resistors, but don't remember how many bits of output you were planning on, and how many units you plan to produce. If the latter number is big, you might use the faster 16-bit (rather than 32-bit) processing and a shorter DAC (for lower cost) with sample-to-sample LSB adjustments to compensate for truncation. [Was there a thread re that, a while back?]-jiw