I am using the AD9959 to simulate walsh patterns by shifting all 4 channels in phase by 90, 180 and 270 degrees every 10 ms.
The phase shifts are programmed by an external micro-controller through the SPI interface. I would like to add a phase ramp
to at least on of the channels that would be independent of the programmed phase values mentioned above, ie the phase out of the channel would equal programmed phase value + phase ramp. The phase needs to sweep continuously at a rate faster than the 10 ms updates.
My micro-controller is not fast enough to program the ramp externally ( <= 1 ms phase updates).
Thanks in advance