Programmable dual-modulus prescaler 8/9, 16/17, 32/33, integrated VCO output 1600 - 1950 MHz VCO, in addition, there is a divide-by-2 option available to bring the RF output to 800 - 975 MHz, due to a narrow band all VCO components are already inside the IC, the VCO RF output is programmable by steps of 3dB, 3-wires serial interface, see also the VHF Communications magazine 4-2010 article about this component