ADF5610 Divider Noise Floor


What is the noise floor of the divider used in the ADF5610?

I do not see any phase noise plots in the datasheet with the divider enabled. I also do not see the divider noise floor defined in the specifications table.

I know there will be a 20*log(N) improvement at close offsets using the divider, but at some point the divider noise floor will be dominant.  I’m interested in that value in dBc/Hz.