The LTC6947 from Analog Devices is a Frequency Synthesizer with Frequency 350 MHz to 6 GHz, Reference Frequency DC to 425 MHz, Output Power -4.3 to 4.5 dBm, Spurious -97 dBc, Supply Voltage 2.25 to 3.15 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for LTC6947 can be seen below.