The LTC6948-4 from Analog Devices is a Phase Locked Loop with Frequency 700 MHz to 6.39 GHz, Phase Noise -274 to -73 dBc/Hz, Output Power -9 to 3 dBm, Operating Temperature -40 to 105 Degree C, PLL Current 0.45 to 60 mA. Tags: Surface Mount, Fractional-N PLL. More details for LTC6948-4 can be seen below.