The SFS5280A-LF from Z-COMM is a Frequency Synthesizer with Frequency 5.28 GHz, Reference Frequency 44 MHz, Output Power -2 to 2 dBm, Spurious -65 dBc, Supply Voltage 3 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for SFS5280A-LF can be seen below.