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ADF4157 Channel Spacing

Question asked by Allan on Apr 18, 2012
Latest reply on Apr 19, 2012 by Allan

Hi,

 

From what I can  see, the channel spacing can’t be set at desired increments as the denominator is fixed at 33554432. As stated in the data sheet, the resolution is REF/33554432. So, for 62.5KHz channel spacing I guess I have to work out the codes for each channel between 3437.5MHz-3687.4375MHz ? Can you confirm this? Frac N synths in the past I have used have allowed the spacing to be defined.

 

With reference to page 18 of 24 in the data sheet I was not clear as to how to work out the Frac values in the example. Are there any other examples I could follow?

 

Regards Allan

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