Do I need to do anything odd to make the SDO pins tristate?
I have a single AD5791 on one board that I can write and read with no problems.
On another board, with the same hardware configuration but pairs of DACs connected to the same SPI bus, I can't seem to read from the DAC. Exactly the same code, same timing etc, I just get garbage in paired DACs case.
I have tried specifically setting SDO in the non-addressed DAC to tristate in the CONTROL register, but that doesn't seem to help either.