The SFS1720A-LF from Z-COMM is a Frequency Synthesizer with Frequency 1.72 GHz, Reference Frequency 10 MHz, Output Power 3 to 9 dBm, Spurious -70 dBc, Supply Voltage 3 V. Tags: Surface Mount, PLL Frequency Synthesizer. More details for SFS1720A-LF can be seen below.