The STW81200-EVB evaluation kit allows the user to program and operate the STW81200 RF fractional/integer synthesizer and its integrated VCOs and LDOs. The kit includes PC-compatible software with a Graphical User Interface (STSW-RFSOL002) allowing the user to write and read all device registers. This gives direct control of circuit functions such as: operating frequency, reference frequency, input mode, charge pump current and low-power modes. The user-oriented GUI aids understanding of the performance, features and characteristics of the STW81200 device under test in a laboratory environment. The GUI displays instant register descriptions when the user slides the mouse over the displayed areas, command buttons and fields.