MAX3840ETJ+TG035

Specialized Overview

The MAX3840ETJ+ is a dual 2x2 asynchronous crosspoint switch designed for SDH/SONET DWDM and high-speed data switching applications. It supports serial data stream loop-through and protection channel switching, making it ideal for OC-48 systems with forward error correction. The device features a high-bandwidth, fully differential signal path that minimizes jitter accumulation, crosstalk, and signal skew. Each 2x2 crosspoint switch can fan out or multiplex up to 2.7Gbps data and 2.7GHz clock signals. All inputs and outputs are current mode logic (CML) compatible and easily adaptable to interface with AC-coupled LVPECL signals. When not used, each CML output stage can be powered down with an enable control to conserve power.

Specialized Feature Summary

• Dual 2x2 asynchronous crosspoint architecture supporting OC-48 systems
• High-bandwidth fully differential signal path minimizing jitter and skew
• CML inputs and outputs compatible with AC-coupled LVPECL signals
• Individual output power-down capability via TTL enable controls

Specialized Applications

• SDH/SONET and DWDM Transport Systems
• Add-Drop Multiplexers
• ATM Switch Cores
• WDM Cross-Connects
• High-Speed Backplanes

Specialized Procurement Notes

Verify the component against the official Analog Devices / Maxim Integrated datasheet Rev5 dated September 18, 2007. Confirm the package type matches the 32-pin TQFN specification (Package Code T3255-3). Ensure the operating temperature range aligns with -40°C to +85°C requirements. Check for lead-free compliance markings as indicated by the '+' suffix in the part number.

Specialized Selection Notes

Select this component when designing systems requiring low jitter accumulation and minimal crosstalk for OC-48 data rates. The internal 50Ω terminations simplify interfacing by reducing external component count. Consider the power-down feature if dynamic power management is required for unused channels. Verify compatibility with existing CML or LVPECL source/sink drivers in the signal chain.

Specialized Part Context

The MAX3840 belongs to the MAX3840 series of analog and digital crosspoint ICs manufactured by Analog Devices / Maxim Integrated. It is specifically categorized under Digital Crosspoint Switches within the Communication & Networking ICs subcategory. The device operates on a single +3.3V supply and is housed in a 32-pin exposed-pad QFN package with a 5mm x 5mm footprint.

Specialized Replacement Considerations

The MAX3840 is explicitly stated to be compatible with the MAX3876 2.5Gbps clock and data recovery circuit. No other direct substitute part numbers are documented in the provided source material.