The LTC6946-2 from Analog Devices is a Frequency Synthesizer with Frequency 513 MHz to 4.91 GHz, Reference Frequency 10 to 250 MHz, Output Power -0.2 to 3.2 dBm, Spurious -103 dBc, Supply Voltage 3.6 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for LTC6946-2 can be seen below.