I am trying to interface with the AD5683R using SPI.
SCLK, SYNC and SDI are visible on the board, but I am unsure as to which pin hole represents SDO.
I am inexperienced in interfacing between modules so any help would be greatly appreciated.
First of all, the EVAL-AD5683RSDZ comes with AD5683RBRMZ which is a 10-Lead MSOP Vlogic option, which does not have the SDO pin. You must install AD5683RBRMZ-3 or AD5683RBRMZ-3-RL7 (please refer to the ordering guide of the datasheet on page 28) which is also a 10-Lead MSOP but with SDO pin.
With the AD5683R (with SDO pin) installed, /RESET (pin 2) is should be accessed through V_IO "hole" and SDO (pin 3) accessed through /RESET "hole" of the PMOD. Since the pin 2 now functions as /RESET which is being controlled by another module, you must disonnect the LINK. You can get more information on page 10 of the datasheet and schematics in the user guide.