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ADRF6820 questions regarding registers

Question asked by rye on Jul 18, 2016
Latest reply on Jul 18, 2016 by gyaliniz


Hi,

 

Our project requires sweeping the LO - when sweeping the LO, is it okay to stay in fractional mode when frac_div is 0? Or should we temporarily switch it to int_mode? For example, is it okay for our PFD frequency go from 55.6 to 56.0?

 

Furthermore, there aren't any restrictions (aside from the min and max bit range) on mod_div and frac_div, correct? So we can use 5 for mod_div, and 0,1,2,3,4 for frac_div?

 

My last question is about the default charge pump control register (in PFD_CTL2 register 0x40), Why is the default edge sensitivity on the negative edge? Why not the positive edge?

 

We have an immediate deadline coming up so quick responses are much appreciated!

 

Thanks again,

Ryan

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