The PSA1685AF-LF from Z-COMM is a Frequency Synthesizer with Frequency 1.68 to 1.69 GHz, Step Size 100 KHz, Reference Frequency 10 MHz, Output Power 1 to 8 dBm, Spurious -70 dBc. Tags: Surface Mount, PLL Frequency Synthesizer. More details for PSA1685AF-LF can be seen below.