The ADF4355-3 data sheet says all power supplies must be 3.3V
I am looking at "EZ-ADF4355-3SD1Z User Guide". In the schematic and parts list it has the VCO etc supplied from a 5V regulator (reference VR2). Is this a mistake?
Yes, this is a mistake in the user guide, all the regulators on the board are 3.3Volt, we will correct this typo in the schematic /BOM in the next user guide revision, regards Brigid.