AD9577BCPZ

Overview

The AD9577BCPZ is a multi-output 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 a single 3.3 V supply. The device provides up to four differential LVDS/LVPECL outputs or eight CMOS outputs, all I2C programmable. Key features include spread spectrum clocking for EMI reduction, frequency margining, and integrated loop filters. Typical phase jitter ranges from 460 fs rms (PLL1) to 660 fs rms (PLL2 fractional mode). It operates within a temperature range of -40°C to +85°C 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 (downspread) and pin-controlled frequency margining.
• 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.
• Precision timing for ADC/DAC systems and digital video applications.
• Optical transport networks (OTN) and packet transport networks (PTN).

Procurement Notes

Verify the specific suffix 'BCPZ' against the manufacturer's current ordering guide to confirm package type and RoHS compliance status. Confirm availability through authorized distributors as supply levels may vary. Ensure proper handling for moisture sensitivity during storage and reflow soldering processes.

Selection Notes

Select this component when low jitter performance is critical for network synchronization. Choose between PLL1 for lowest jitter or PLL2 for fractional-N flexibility. Verify that the required output formats (LVDS, LVPECL, or CMOS) align with the system interface requirements. Ensure the input reference frequency falls within the supported range for optimal phase noise performance.

Part Context

The AD9577 belongs to Analog Devices' portfolio of high-performance clock generators optimized for networking applications. It complements other devices like the AD9576 and AD9578 by offering dual PLL capabilities in a compact form factor. The device is designed to replace discrete PLL solutions, integrating VCOs and dividers on-chip for improved reliability and reduced footprint.

Replacement Considerations

Direct replacements include the AD9576 and AD9578, which share similar packaging and functionality but may differ in specific output counts or jitter specifications. Verify register compatibility and electrical parameters before substitution.