The LTC6946-4 from Analog Devices is a Frequency Synthesizer with Frequency 700 MHz to 6.39 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 LTC6946-4 can be seen below.