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ADF4360-9 Band Selection

Question asked by KJB on Jan 24, 2014
Latest reply on Feb 3, 2014 by Brigid.Duggan

Having a problem guaranteeing the VCO band that is selected after power up or an update of the N register.

 

My application is using the ADF4360-9 in an FM modulation scheme.  Is there a way to guarantee that the device will always select the same VCO band given the same setup conditions in the control registers and Ref in.  It appears that sometimes the device uses a different band after updating the control registers as described in the data sheet since the VCO produces different deviations for the same input modulation signal. The ref in signal is 200Khz.  I have tried different band select settings with no effect on the randomness of the operation.  If I send the same information to the N register I get inconsistent results as to the amount of deviation on the VCO.  All of this indicates that the internal circuitry does not select the same band for the same conditions.  Can you explain this?  Is there a way to guarantee the same band is selected for a given set of conditions?

 

Thanks you.

Ken

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