The AD9954 electrical specification provide both 1.8 & 3.3v parameters for  DVDD_IO.

Noting that sync_clk rateis limited to 62.5Mhz at 1.8V

However the pin specification for DVDD_IO is: "Digital Power Supply. This pin is for I/O cells only, 3.3 V."

And then again in "Synchronizing Multiple AD9954s"

"Finally, the DVDD_I/O supply should be set to 3.3 V for all devices that are to be synchronized."

So can 1.8v be used for DVDD_IO our should the notes later in the datasheet about 3.3V only be adhered to?

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