The FSFS315555-500 from Synergy Microwave Corporation is a Frequency Synthesizer with Frequency 3.15 to 5.55 GHz, Step Size 5 MHz, Reference Frequency 10 MHz, Output Power 5 dBm, Supply Voltage 5 to 15 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for FSFS315555-500 can be seen below.