8V19N478

FemtoClock® NG Jitter Attenuator and Clock Synthesizer 8V19N478 Datasheet Description The 8V19N478 is a fully integrated FemtoClock NG jitter attenuator and clock synthesizer designed as a high-performance clock solution for conditioning and frequency/phase management of 10/40/100/400 Gigabit-Ethernet line cards. The device is optimized to deliver excellent phase noise performance as required to drive physical layer devices, and provides the clean clock frequencies of 625MHz, 500MHz, 312.5MHz, 250MHz, 156.25MHz, and 125MHz. A two-stage PLL architecture supports both jitter attenuation and frequency multiplication. The first stage PLL is the jitter attenuator, and uses an external VCXO for best possible phase noise characteristics. The second stage PLL locks on the VCXO-PLL output signal, and synthesizes the target frequency. This PLL has a VCO circuit at 2500MHz. The 8V19N478 generates the output clock signals from the VCO by frequency division. Four independent frequency dividers a...