The HMC839 from Analog Devices is a Frequency Synthesizer with Frequency 1.05 to 4.82 GHz, Reference Frequency 10 to 200 MHz, Output Power 12.5 dBm, Supply Voltage 3 to 5.2 V, Current 128 mA. Tags: Surface Mount, PLL Frequency Synthesizer. More details for HMC839 can be seen below.