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ADF4360-1 behavior at 2098 MHz (edge of VCO bands) during REFin drift

Hi,

How would ADF4360-1 behave when frequency is set to 2098 MHz (which is right on the edge of VCO bands) and REFin is drifting within +-1% (see picture from the datasheet below). Will it lose lock or switch the VCO band? 

Regards,
Ivan