AD9361 pin H12 look like is input funciton, if we don't provide anything, sould be low level.
Please reference to as below schematic,
In LVDS mode,
LDO provide 1.8V for VDD_Interface, and measure pin H12, we can find 2.6V.
If cut power trace to pin H12, still have 2.6V.
Double confirm Intel reference board, still have this issue.
Do you have any comment about this?