MAX3665E/D

Overview

The MAX3665E/D is a transimpedance preamplifier designed for SDH/SONET applications operating at 622Mbps. It consumes only 70mW when powered by a single +3.3V or +5.0V supply. The device converts small photodiode currents into measurable differential voltages. A built-in DC cancellation circuit ensures true differential output swing across a wide range of input current levels, thereby reducing pulse-width distortion. The differential outputs are back-terminated with 50Ω per side, and the overall transimpedance gain is nominally 8kΩ.

Feature Summary

• Integrates a DC cancellation circuit to maintain true differential output swing over a wide range of input current levels
• Reduces pulse-width distortion through advanced signal processing capabilities
• Features differential outputs with integrated 50Ω back-termination on each side
• Operates from a single +3.3V or +5.0V power supply

Applications

• SDH (Synchronous Digital Hierarchy) systems
• SONET (Synchronous Optical Networking) systems
• Optical receiver front-ends for fiber optic communications

Procurement Notes

Verify the specific suffix against official documentation, as package variations exist between the EUA and D variants. Confirm RoHS compliance status, as some listings indicate lead-free options while others may not be compliant. Check current availability as stock levels fluctuate due to limited supply situations. Ensure the selected part matches the required pinout and thermal characteristics for the target PCB layout.

Selection Notes

Select this component for high-speed optical receivers requiring low power consumption and precise signal integrity. The nominal 8kΩ transimpedance gain suits standard photodiode interfaces in telecom networks. Verify that the operating temperature range meets environmental requirements. Consider the TSSOP or Micro Max package constraints during mechanical design. Ensure the power supply voltage aligns with the +3.3V or +5.0V specifications.

Part Context

This device belongs to the MAX3665 family of transimpedance amplifiers optimized for telecommunications. It serves as a critical interface between photodetectors and subsequent signal processing stages in optical networking equipment. The design focuses on minimizing power usage while maintaining high performance in SONET/SDH environments.

Replacement Considerations

Public confirmed substitute part numbers are not available.