AD9571

Ethernet Clock Generator, 10 Clock Outputs AD9571 FEATURES Fully integrated VCO/PLL core 0.17 ps rms jitter from 1.875 MHz to 20 MHz at 156.25 MHz 0.41 ps rms jitter from 12 kHz to 20 MHz at 125 MHz Input crystal or clock frequency of 25 MHz Preset divide ratios for 156.25 MHz, 33.33 MHz,100 MHz, and 125 MHz Choice of LVPECL or LVDS output format Integrated loop filter 6 copies of reference clock output Rates configured via strapping pins Space saving 6 mm × 6 mm 40-lead LFCSP 0.48 W power dissipation (LVDS operation) 0.69 W power dissipation (LVPECL operation) 3.3 V operation APPLICATIONS Ethernet line cards, switches, and routers SCSI, SATA, and PCI-express PCI support included Low jitter, low phase noise clock generation REFCLK FUNCTIONAL BLOCK DIAGRAM REFSEL CMOS XTAL OSC 6 × 25MHz PFD/CP 3RD-ORDER LPF VCO LVPECL OR LVDS 1 × 156.25MHz AD9571 CMOS 2 × 100MHz OR 125MHz 1 × 33.33MHz FORCE_LOW FREQSEL Figure 1. DIVIDERS 07499-001 GENERAL DESCRIPTION The AD9571 pro...