From datasheet, it says only VSS_GPO can be connected to 3V3 supply.
Does anyone knows if SPI and CTRL_OUT[7:0] logic can be configured to use 3V3 instead of 1V8? or they are strictly 1V8 signals.
I think you use maximum as 2.5 V only, since VDD_INTERFACE voltage level range is from 1.8V-2.5V
SPI and CTRL_OUT run off of VDD_INTERFACE supply.
VDD_INTERFACE supply range can be found on pg 7 of the AD9361 datasheet. Maximum voltage is 2.5V with +/-5V tolerance.
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