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AD9956: How to do ramp up and down in a loop using registers

Question asked by onder on Mar 9, 2017
Latest reply on Mar 12, 2017 by mcee

Hi everyone

 I have AD9956 and I build a fractional divider PLL circuit as seen in Evaluation Board datasheet. I am using its crystal mounted on the evaluation board as a reference clock so that reference frequency is 25MHz. VCO frequency can be sweeped from 2.313 GHz to 2.4725 GHz. I can sweep frequency up and down using its program on the pc. Which register is responsible  to program AD9956 to sweep frequency up and down in a loop  so that I can write the register and do this action using your software?

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