AD9577BCPZ-R7

Overview

The AD9577BCPZ-R7 is a multioutput clock generator featuring two integrated phase-locked loop (PLL) cores: an integer-N PLL and a fractional-N PLL. It supports output frequencies up to 637.5 MHz with I2C programmable configurations. The device provides up to four differential LVDS/LVPECL outputs or eight CMOS outputs, along with a buffered reference clock. Key features include spread spectrum clocking for EMI reduction, frequency margining, and integrated loop filters. It operates on a single 3.3 V supply within a -40°C to +85°C temperature range in a 40-lead LFCSP package.

Feature Summary

• Dual PLL architecture with one integer-N and one fractional-N core for flexible frequency synthesis.
• Integrated loop filters eliminate external components, reducing board space and design time.
• Supports spread spectrum clocking with up to -0.5% downspread to minimize EMI peak power.
• Configurable outputs support up to four LVDS/LVPECL pairs or eight CMOS signals.

Applications

• Data communications including Ethernet, SONET/SDH, and Fiber Channel.
• High-speed interfaces such as PCI Express (PCIe) and SATA.
• Optical transport networks (OTN) and packet transport networks (PTN).
• Clocking for ADC/DAC systems and digital video applications.

Procurement Notes

Verify the R7 suffix indicates reel packaging when sourcing. Confirm the specific B-grade temperature and voltage ratings match system requirements. Check for moisture sensitivity handling instructions due to the LFCSP package type. Ensure I2C interface compatibility with the host controller logic levels.

Selection Notes

Select this component for applications requiring low jitter (<1 ps rms cycle-to-cycle) and multiple output formats from a single source. Choose the integer-N mode of PLL2 if lowest jitter is critical over fractional flexibility. Verify that the required output frequencies fall within the supported continuous range of 11.2 MHz to 200 MHz or the extended range up to 637.5 MHz.

Part Context

This part belongs to the AD9577 series of network clock generators. It is designed to replace discrete clock distribution solutions by integrating VCOs, dividers, and loop filters. The BC designation typically refers to the commercial temperature grade and specific manufacturing lot codes within the Analog Devices portfolio.

Replacement Considerations

Direct replacements within the same family include the AD9576 and AD9578. Cross-family alternatives like the AD9546 or LTC6952 may require significant schematic redesign due to differences in PLL architecture and output drive capabilities.