MAX3872ETJ+

Overview

The MAX3872ETJ+ is a multirate clock and data recovery (CDR) integrated circuit with a limiting amplifier, designed for SONET/SDH and Gigabit Ethernet applications. It operates from a single +3.0V to +3.6V supply, typically consuming 580mW. The device features a fully integrated phase-locked loop that recovers a synchronous clock signal from serial NRZ data inputs without an external reference clock. It supports input data rates ranging from 155.52Mbps to 2.667Gbps (FEC). The recovered data and clock outputs are CML format with on-chip 50Ω back termination. Jitter generation is typically 2.7mUI RMS, exceeding ANSI, ITU, and Bellcore specifications.

Feature Summary

• Multirate Data Input: Supports 2.667Gbps (FEC), 2.488Gbps, 1.244Gbps, 622.08Mbps, 155.52Mbps, and 1.25Gbps/2.5Gbps Ethernet.
• Integrated PLL: Fully integrated phase-locked loop recovers synchronous clock from serial NRZ data without requiring an external reference clock.
• Threshold Control: Vertical threshold control adjusts ±170mV to compensate for optical noise in DWDM systems using EDFAs.
• Low Jitter Performance: Generates 2.7mUI RMS jitter and exceeds SONET/SDH jitter specifications.

Applications

• SONET/SDH Receivers and Regenerators
• Add/Drop Multiplexers
• Digital Cross-Connects
• DWDM Transmission Systems

Procurement Notes

Verify the package marking and date code against the manufacturer's latest documentation. Confirm RoHS compliance status as indicated by the '+' suffix. Check for obsolescence notices or lifecycle changes directly from Analog Devices/Maxim Integrated before finalizing procurement plans.

Selection Notes

Select this component for OC-3, OC-12, OC-24, OC-48, and Gigabit Ethernet applications requiring high sensitivity and low jitter. Ensure the design accommodates the 32-TQFN (5x5mm) package with exposed pad for thermal management. Verify logic levels for control pins (LVTTL) match the system voltage if operating outside the standard 3.3V range.

Part Context

The MAX3872ETJ+ belongs to the MAX3872 series of clock and data recovery ICs. It is manufactured by Analog Devices Inc./Maxim Integrated. The 'ETJ+' suffix indicates a -40°C to +85°C temperature range, TQFN-EP package, and lead-free construction. It is part of the broader portfolio of timing and synchronization solutions for telecommunications infrastructure.

Replacement Considerations

Consult official replacement guides for cross-referencing. No direct public substitute part numbers are confirmed in the provided source material.