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Detecting the sweep direction in AD9910

Question asked by MeenuGujjar on Sep 20, 2013
Latest reply on Sep 24, 2013 by MeenuGujjar



I'm am using the DRG in AD9910 to generate a continuous bi-directional frequency ramp by setting both no-dwell bits to high. I am also monitoring the DROVR pin to detect when the upper or lower frequency limits are reached.


However, I also need some digital signal that can tell me the direction of the frequency ramp (up or down) in run-time. I thought about monitoring the DRCTRL pin (which controls the direction of the ramp) but I did not detect any signal on that pin (probably because it is an 'input-only' pin).


Please tell me if there is some way to know the direction of the ramp in run-time.