ADF4360 output impedance

Question I would like to use a single chip balun for the output of the ADF4360. However there doesn't seem to be any output impedance information in the datasheet. Only an application circuit using lumped elements. I was wondering if you could advise on what impedance ratio I should use for a balun i.e. 1:1, 2:1, or 4:1? Answer I have attached a document that looks at what matching network to use in order to get maximum power o/p from the ADF4360-1, the same principle can be applied for the lower frequency versions.