AD9571ACPZPEC

Overview

The AD9571ACPZPEC is an Ethernet clock generator featuring a dedicated integer-N PLL core optimized for line card applications. It provides ten clock outputs: one LVPECL/LVDS pair at 156.25 MHz, two LVPECL/LVDS pairs at 100 MHz or 125 MHz (configurable via strapping), one CMOS output at 33.33 MHz, and six CMOS outputs at 25 MHz. The device operates on a single 3.3 V supply within a 40-lead LFCSP package. Jitter performance is specified at 0.17 ps rms (1.875 MHz to 20 MHz) for the 156.25 MHz LVDS output.

Feature Summary

• Integrated VCO/PLL core with factory-programmed divide ratios for 156.25 MHz, 125 MHz, 100 MHz, and 33.33 MHz.
• Low jitter performance: 0.17 ps rms (1.875 MHz–20 MHz) at 156.25 MHz LVDS output; 0.41 ps rms (12 kHz–20 MHz) at 125 MHz LVDS output.
• Flexible output formats including LVPECL, LVDS, and CMOS with integrated loop filter and regulators.
• Configuration via strapping pins for frequency selection and reference source without processor intervention.

Applications

• Ethernet line cards, switches, and routers
• SCSI, SATA, and PCI-express systems
• PCI support applications

Procurement Notes

Verify the ordering suffix PEC against the manufacturer's current data sheet to confirm the specific output format configuration (LVPECL vs. LVDS). Ensure compliance with RoHS directives and moisture sensitivity levels prior to assembly. Confirm that the 40-lead LFCSP thermal requirements are met by the target PCB layout.

Selection Notes

Select this component when fixed-frequency clock generation for Ethernet or storage interfaces is required without programmable logic. The device supports input frequencies of 25 MHz via crystal or external clock. Designers must account for power dissipation differences between LVDS (0.48 W) and LVPECL (0.69 W) configurations during thermal planning.

Part Context

The AD9571 belongs to Analog Devices' portfolio of high-performance, low-jitter frequency synthesizers. It is designed to maximize network performance through a proven integer-N PLL architecture. The part eliminates the need for external loop filter components, reducing board space and design time compared to programmable synthesizers.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate other members of the AD957x family or comparable Ethernet clock generators based on pin compatibility and jitter specifications.