I have encountered an issue while using TXEN0/1 pins on AD9173. The SPI TXEN control is disabled for both DACs, however DAC1 output cannot be enabled using TXEN1 only, but both TXEN0 and 1 have to be set. This does not apply for DAC0.
In other words, DAC0 is normally controlled with TXEN0, while TXEN1 has effect on DAC1 only if TXEN0 is asserted.
Is this expected behavior?