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to power the DRIXO oscillators I suggest 16-17 VDC, as clean as possible.
The voltage range of the power supply of the DAC Lite affects the output voltage only. The greater the power supply voltage the higher the voltage output of the DAC.
We usually power the DAC Lite with 4VDC, both digital and Vref.
There is no problem powering the dital section with 5V and Vref with 3V3. But if you use 5V for the digital section of the DAC you have to use the same 5V for the clean section of the FIFO buffer (J18).
Hope yhis helps.