I'm adapting a design from a retired engineer with two discrete AD9705s being used for IQ modulation. I noticed that in an earlier design, he had used a single AD9763. Comparing both of these options, it seems that the two discrete AD9705s beat the AD9763 in multiple figures of merit, especially with regard to power consumption.
I figure there has to be some benefit to using one dual DAC vs. two single DACs. Maybe a bit of board real estate, but if you were to just go off power dissipation the AD970x line is hard to beat.
Forgive my ignorance, but are there other benefits that I'm overlooking?
One advantage of a dual DAC is that the I and Q outputs are synchronized giving you an accurate 90 degree phase shift. The AD9715 is a dual low power DAC you may consider for this design.