RF-DAC Analog Outputs - 2.6 English

Each RF-DAC in a tile has its own differential analog current output buffer/driver. The output currents are complementary; the sum of the two currents always equals the full-scale current of the RF-DAC. The digital input code determines the effective differential current delivered to the load. The differential RF-DAC outputs are typically AC-coupled out using capacitors. RF-DAC output DC-coupling is also supported, assuming that the correct common mode biasing and load impedance requirements are met. See UltraScale Architecture PCB Design User Guide (UG583) for more details.