I have an AD9783 in a design I am working on, and we are using the 16b differential inputs to drive the DAC. I have a generated sine wave from an FPGA feeding both ends of the differential input, and I can see the output on a oscope fine (so everything is hooked up fine on the PCB).
My question is, when I tried to put just a tone out on the DAC, I cannot seem to get it to work. I am trying to feed a constant, but all I see is 0V coming out. Am I missing something about this part?
Thinking that there was something up with just putting out a steady value, I then incremented the value on every clock tick (which decrements in the N leg every clock tick), and let it roll over. This causes a zero crossing on the rollover, which is the only time I see a slight change on my oscope.
Why is it I cannot just feed the inputs 0x7FBC (P input) and 0x8044 (N input) and see a positive tone come out of the DAC?