I am using ADF4350 to generate a frequency sweep of 1.1 GHz to 1.3 GHz. But when I try to write the part successively, it is not getting locked. The lock detect LED is blinking continuously but with less brightness and suddenly with high brightness in between.
When I program the part for a single frequency, the LD LED shows a perfect lock.
What could be the problem? My specifications are:
REFin = 16 MHz MOD =130 INT = 137 FRAC = 65
The corresponding pll file is attached.