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Frequency Ramp Generation using AD9910

Question asked by pssijo on Feb 4, 2013
Latest reply on Feb 5, 2013 by sitti



I am trying Digital Ramp Generation to sweep frequency. My requirement is to generate sweep frequency by entering start and stop frequency with a given step size and interval. Frequency will have positive slope only,after reaching upper limit it should jump back to lower limit(No dwell ramp generation), and same thing should continue periodically. I want to know whether it is possible to sweep frequency without controlling these external pins (DROVER,DRHOLD and DRCTL) using controller? That means by making DRHOLD = 0 (GND) (Since I don't want to hold the frequency), and DRCTL(only +ve slope) permanently. Is transition from logic 0 to 1 is required  to sweep from lower limit to upper limit everytime?

Please give your suggestions.