The SFS1800R-LF from Z-COMM is a Frequency Synthesizer with Frequency 1.8 GHz, Reference Frequency 100 MHz, Output Power 3 to 8 dBm, Spurious -70 dBc, Supply Voltage 3 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for SFS1800R-LF can be seen below.