Does the AD9783 DAC family (AD9783,AD9781 and AD9780) LVDS interface support “dual-port" mode as suggested in the data sheet? Does the AD9783 LVDS inputs require external 100 ohm termination resistors?
The AD9783 DAC family only supports a single port time interleaved data interface. The dual port interface mentioned in the data sheet was a mistake and is not supported in order to keep the pin count to 72 pins. The AD9783 DAC family does include internal 100 ohm termination resistors in the LVDS inptus. These on chip termination resistors are specified as differntial input impedance "Rin" in Table 2 and vary from 80 to 120 ohms. External termination resistors are not required.