ADF5356 lock only on after the second REG0 writing

Registers value I have used

Hi,

Register 0 should be re-written when a double buffered setting is changed (FRAC1, FRAC2, MOD2 RDIV2), you can see that under the program modes section in the datasheet. that includes RF divider selection also. are you updating output frequency periodically or you are operating a fixed output value? 

Hi,

Register 0 should be re-written when a double buffered setting is changed (FRAC1, FRAC2, MOD2 RDIV2), you can see that under the program modes section in the datasheet. that includes RF divider selection also. are you updating output frequency periodically or you are operating a fixed output value? 

Ok, perhaps the datasheet is not clear enough for me. I am using a fixed output value. The second writing is only necessary on my custom board, not with the development kit.