For I/Q input to I/Q output, the RF-DACs are paired. An I/Q output signal requires a pair of RF-DACs, one for I data and one for Q data. As shown in the following figure, a single DUC block outputs I and Q data and these signals are sent to the two RF-DACs.
Figure 1. RF-DAC I/Q Input to I/Q Output
Figure 2. RF-DAC I/Q Input to I/Q Output IP Core Configuration
The following figure shows an RF-DAC with I/Q input data to I/Q output data with 2x interpolation, the mixer bypassed, and with a 400 MHz AXI4-Stream clock.
Figure 3. RF-DAC I/Q Input to I/Q Output Data Timing
Note: Interpolation is x2 because the bandwidth available on the AXI4-Stream interface is limited.