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ADN2525:  10.7 GBPS ACTIVE BACK-TERMINATION, DIFFERENTIAL LASER DIODE DRIVER

The ADN2525 laser diode driver is designed for direct modula-tion of packaged laser diodes having a differential resistance ranging from 5 Ωto 50 Ω. The active back-termination technique provides excellent matching with the output transmission lines while reducing the power dissipation in the output stage. The back-termination in the ADN2525 absorbs signal reflections from the TOSA end of the ...More

ADN2525:  10.7 GBPS ACTIVE BACK-TERMINATION, DIFFERENTIAL LASER DIODE DRIVER

Product Description

The ADN2525 laser diode driver is designed for direct modula-tion of packaged laser diodes having a differential resistance ranging from 5 Ωto 50 Ω. The active back-termination technique provides excellent matching with the output transmission lines while reducing the power dissipation in the output stage. The back-termination in the ADN2525 absorbs signal reflections from the TOSA end of the output transmission lines, enabling excellent optical eye quality to be achieved even when the TOSA end of the output transmission lines is significantly misterminated. The small package provides the optimum solution for compact modules where 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 power and extinction ratio control schemes, including closed-loop control and look-up tables. The automatic laser shutdown (ALS) feature allows the user to turn on/off the bias and modulation currents by driving the ALS pin with the proper logic levels.

The product is available in a space-saving 3 mm × 3 mm LFCSP specified from −40°C to +85°C.

Applications

  • SONET OC-192 optical transceivers
  • SDH STM-64 optical transceivers
  • 10 Gb Ethernet optical transceivers
  • XFP/X2/XENPAK/XPAK/MSA 300 optical modules
  • SR and VSR optical links

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • Up to 10.7 Gbps operation
    • Very low power: 670 mW (IBIAS = 40 mA, IMOD = 40 mA)
    • Typical 24 ps rise/fall times
    • Full back-termination of output transmission lines
    • Drives TOSAs with resistances ranging from 5 Ω to 50 Ω
    • Compatible with XMD-MSA TOSA
    • PECL-/CML-compatible data inputs
    • Bias current range: 10 mA to 100 mA
    • Differential modulation current range: 10 mA to 80 mA
    • Automatic laser shutdown (ALS)
    • 3.3 V operation
    • Compact 3 mm × 3 mm LFCSP
    • Data Rate (Gbps) : 10.7
    • Voltage Supply (V): 3.3V
    • Single Ended/Differential: Differential
    • Package: 3x3 mm LFCSP
    • Modulation Current (mA): 80mA
    • Laser Bias Current (mA): 100mA
    • Rise/Fall Time (ps): 24ps
    • MSA Compliance: XFP, Xenpak, X2, MSA-300

    Functional Block Diagram for ADN2525

    OF NOTE ...

    Optical evaluation boards (with 10G TOSAs) are available. Please contact the Fiber Optic IC Development Group for information on Evaluation Boards.

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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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.