AD9576BCPZ

Overview

The AD9576BCPZ is a dual-channel asynchronous clock generator featuring two dedicated phase-locked loop (PLL) cores within a 64-lead, 9 mm × 9 mm LFCSP package. It supports single 2.5 V or 3.3 V supply operation and operates across a temperature range of −40°C to +85°C. The device provides up to 11 pairs of configurable differential outputs with drive formats including HSTL, LVDS, HCSL, and CMOS. Key electrical specifications include a maximum output frequency of 1.25 GHz and a maximum input frequency of 325 MHz. Typical RMS jitter performance is less than 0.3 ps for integer-N translations and less than 0.5 ps for fractional-N translations over a 12 kHz to 20 MHz bandwidth.

Feature Summary

• Dual PLL architecture: Fractional-N PLL (VCO 2375–2725 MHz) for low jitter and Integer-N PLL (VCO 750–825 MHz) for general-purpose clocks.
• Automatic redundant crystal switchover with reference monitoring to extend operating life and minimize switching transients.
• Configurable via pin strapping (PPRx) for power-on ready states or manual configuration through SPI/I²C serial interfaces.
• Up to 11 differential output pairs supporting multiple logic standards including HSTL, LVDS, HCSL, and 1.8 V/2.5 V/3.3 V CMOS.

Applications

• Ethernet line cards, switches, and routers
• Baseband units in telecommunications infrastructure
• SATA and PCI Express interface clocking
• Low jitter and asynchronous clock generation systems

Procurement Notes

Verify the specific suffix 'BCPZ' against the manufacturer's ordering guide to confirm package type and RoHS compliance status. Ensure that the required supply voltage (2.5 V or 3.3 V) matches the system design constraints. Confirm that the application environment falls within the specified -40°C to +85°C operating temperature range. Check for any specific revision history updates in the latest datasheet regarding register configurations or timing parameters.

Selection Notes

Select this component when a system requires multiple asynchronous clock domains with high precision. The AD9576 is suitable for applications needing both low-jitter fractional-N synthesis for data converters or SERDES and general-purpose integer-N clocks for CPUs or FPGAs. Consider the pin-strapping capabilities if fixed power-on configurations are sufficient, reducing the need for complex serial initialization code. Evaluate the output driver requirements to ensure the available logic families (HSTL, LVDS, etc.) match the downstream receiver inputs.

Part Context

The AD9576 belongs to Analog Devices' portfolio of high-performance clock generators designed for networking and telecommunications. It integrates fully synthesized VCOs and loop filters, simplifying board layout by requiring only minimal external components. The device replaces discrete PLL and buffer solutions, offering a compact footprint and reduced power consumption compared to multi-chip approaches.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation. Users should consult the official Analog Devices website or authorized distributors for current availability and potential cross-reference options based on specific pinout and electrical compatibility requirements.