With in the mentioned Bands ie, 45 - 1050, 1400 - 2100, 2800 - 4200, 5600 - 8400 MHz Sweep is possible. By changing the RF Path "N" Divider it is possible to sweep the frequency.
Refer: http://www.hittite.com/content/documents/operating_guide/pll_operating_guide_rf_vcos.pdf