11.3 Gbps, Active Back-Termination, Differential Laser Diode Driver

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Product Details

The ADN2531 laser diode driver can work with directly modulated laser diodes, including vertical-cavity surface-emitting laser (VCSEL), Fabry-Perot (FP) lasers, and distributed feedback (DFB) lasers, with a differential loading resistance ranging from 5 Ω to 140 Ω. The active back-termination in the ADN2531 absorbs signal reflections from the laser diode side of the output transmission lines, enabling excellent optical eye quality even when the TOSA end of the output transmission lines is significantly mismatched. The ADN2531 is a SFP+ MSA-compliant device, and small package and enhanced ESD protection provides the optimum solution for compact modules in which laser diodes are packaged in low pin-count optical subassemblies.

The modulation and bias currents are programmable via the MSET and BSET control pins. By driving these pins with control voltages, the user has the flexibility to implement various average optical power and extinction ratio control schemes, including a closed-loop or a look-up table control. The automatic laser shutdown (ALS) feature allows turning the bias on and off while simultaneously modulating currents by driving the ALS pin with a low voltage transistor-to-transistor logic (LVTTL) source.

The product is available in a space-saving, 3 mm × 3 mm LFCSP package and operates from −40°C to +100°C.


  • Optical transmitters, up to 11.3 Gbps, for SONET/SDH, Ethernet, and Fibre Channel applications
  • 300-pin optical modules, up to 11.3 Gbps

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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