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Ramping frequency from negative to positive on AD9910 possible?

Question asked by Abarber on Aug 22, 2017
Latest reply on Aug 24, 2017 by mcee

I'd like to use the AD9910 to generate frequency ramps with a negative start freq and a positive stop freq (passing through 0). By negative, I mean a tuning word having a value between 0H80000000 and 0HFFFFFFFF. From reviewing  posts on the AD9910, it appears negative frequencies are allowed. The question is: Are the sweep limit comparators implemented in offset binary or 2's complement? In other words, will the comparators recognize negative numbers as such or will this sweep setup fail ?

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