I have a really weird problem and I'm hoping someone here can shed some light. I have 6 of these DACs in a system, and I'm seeing a very strange output on one of these DACs. The problem doesn't exist on all 6 DACs, and if it does exist, it doesn't come and go; it's permanent.
I'm writing the DAC with a bit rate of 50nS (more than twice the minimum). The DATA looks perfect, I have images that I can show someone. The problem is that if the output goes from a low value (near zero data input) to a near full value (just below FFFF), the output has a couple transitions before it hits the full and final output value. Just to confirm it wasn't related to the output circuit I'm driving, I floated the DAC output. Didn't change a thing.
Any thoughts?