Will the AD9172 (or other DAC) allow me to transfer a wide band signal (say 200MHz-1GHz) over JESD with 2.2GHz clock, then have DAC IC interpolate by 4x, upsample by 4x, and clock the 2.4GHz-3.2GHz signal out of DAC at 4x 2.2GHz = 8.8GSps?
Yes you can, which is in part the intended use for the interpolation filters - to keep the JESD speed relatively low, just enough to account for the target datarate (looks like 800MHz in your case), while keeping the DAC core clock relatively high to stretch all the spurs across a wider 1st Nyquist zone (DC to Fdac/2).
In theory (depending how strict your 800MHz bw requirement is) you could also use 6x interp with Fdac=12GHz, resulting in the a combined-IQ datarate of 1600MHz.
You can use the NCO to upconvert your signal to the center of your bw, anywhere within 1st Nyquist
Note the interpolation filters cover 80% bw:
datarate (combined I and Q) = Fdac/Ninterp
useable BW = datarate * [0.8 if Ninterp > 1, else 1]
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