AD9574

Data Sheet Ethernet/Gigabit Ethernet Clock Generator AD9574 FEATURES Redundant input reference clock capability Reference monitoring function Fully integrated VCO/PLL core Jitter (rms) 0.234 ps rms jitter (10 kHz to 10 MHz) at 156.25 MHz 0.243 ps rms jitter (12 kHz to 20 MHz) at 156.25 MHz Input frequency: 19.44 MHz or 25 MHz Preset frequency translations Using a 19.44 MHz input reference 19.44 MHz, 38.88 MHz, 77.76 MHz, 155.52 MHz Using a 25 MHz input reference 25 MHz, 33.33 MHz, 50 MHz, 66.67 MHz, 80 MHz, 100 MHz, 125 MHz, 133.3 MHz, 156.25 MHz, 160 MHz, 312.5 MHz Output drive formats: HSTL, LVDS, HCSL, and 1.8 V and 3.3 V CMOS Integrated loop filter (requires a single external capacitor) 2 copies of reference clock output Device configuration via strapping pins (PPRx) Space-saving 7 mm × 7 mm 48-lead LFCSP 3.3 V operation APPLICATIONS Ethernet line cards, switches, and routers SATA and PCI express Low jitter, low phase noise clock generation GENERAL DESCRIPTION The AD9574 provides a multiple output clock generator function comprising a dedicated phase-locked loop (PLL) core optimized for Ethernet and gigabit Ethernet line card applications. The integer-N PLL design is based on the Analog Devices, Inc., proven portfolio of high performance, low jitter frequency synthesizers to maximize network performance. The AD9574 also benefits other applications requiring low phase noise and jitter performance. Configuring the AD9574 for a particular application requires only the conn...