The SFS1680A-LF from Z-COMM is a Frequency Synthesizer with Frequency 1.68 GHz, Reference Frequency 10 MHz, Output Power 4 to 8 dBm, Spurious -80 dBc, Supply Voltage 3 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for SFS1680A-LF can be seen below.