AD9859 configuration commands and IO connection

Hi sgk ,

Moving this thread to Direct Digital Synthesis (DDS). 

Hi sgk ,

May I know what specific register values are you referring to? If you mean default, you can start by these values below:

If you meant otherwise, let me know.

All the best,

Jules

Hi Jules.Nikko,

If I want to get output frequency of 100 MHz, what values to be set for CFR1, CFR2, ASF, ARR, FTW and PTW registers to get exact 100 MHz out frequency. What are the IO connections to be done.

Thanks,

SGK

Hi sgk ,

CF1 and CFR2 can be set to their default values unless you will be using multipliers which will then need some register changes on CFR2[3:7] . 

As for ASF and ARR, this is dependent on your specific application. Will vary whether you are using a ramp or some amplitude scale factor.

FTW will be computed depending on your clock input.

Page 14-17 of the AD9859 data sheet discusses these registers and their default values. 

All the best,

Jules