The PLL1919BQ-SS-523.5MHz-543.5MHz-A from Dynamic Engineers is a Frequency Synthesizer with Frequency 523.5 to 543.5 MHz, Step Size 100 KHz, Reference Frequency 5 to 100 MHz, Output Power -2 to 2 dBm, Harmonics -33 to -20 dBc. Tags: Surface Mount, PLL Frequency Synthesizer. More details for PLL1919BQ-SS-523.5MHz-543.5MHz-A can be seen below.