AD9707 SPI Interface Voltage


I want to use different voltages for AVDD and DVDD for my new AD9707-design.

The datasheet says on page 30, that the SPI terminal voltages are referenced to ACOM.

Does that actually mean, that the SPI switching thresholds and the digital SPI output voltage is related to AVDD, not DVDD?

With all supply voltages at 1,8V, only 125MSPs are guaranteed (page 9). Can I go faster when AVDD=3,3V and CLKVDD=DVDD=1,8V, or is DVDD/CLKVDD the limiting factor in this case?