The HMC837 from Analog Devices is a Frequency Synthesizer with Frequency 1.025 to 4.6 GHz, Reference Frequency 50 to 200 MHz, Output Power 13 dBm, Supply Voltage 3 to 5.2 V, Current 141 mA. Tags: Surface Mount, PLL Frequency Synthesizer. More details for HMC837 can be seen below.