ADN2870:  3.3 V, Dual Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

The ADN2870* laser diode driver is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio, which ...More

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ADN2870:  3.3 V, Dual Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

Product Description

The ADN2870* laser diode driver is designed for advanced SFP and SFF modules, using SFF-8472 digital diagnostics. The device features dual-loop control of the average power and extinction ratio, which automatically compensates for variations in laser characteristics over temperature and aging. The laser needs only to be calibrated at 25°C, eliminating the expensive and time consuming temperature calibration. The ADN2870 supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate operation from 155 Mbps to 3.3 Gbps.

Average power and extinction ratios can be set with reference voltages provided by a microcontroller DAC or by adjustable resistors. The ADN2870 provides bias and modulation current monitoring as well as fail alarms and automatic laser shutdown. The device interfaces easily with the ADuC702x family of MicroConverters® and with the ADN289x family of limiting amplifiers to make a complete SFP/SFF transceiver solution. An SFP reference design is available. The product is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range.

Applications

  • Multirate OC3 to OC48-FEC SFP/SFF modules
  • 1×/2×/4× Fibre Channel SFP/SFF modules
  • LX-4 modules
  • DWDM/CWDM SFP modules
  • 1GE SFP/SFF transceiver modules

    • *Protected by U.S. Patent 6,414,974.

    Data Sheet, Rev. A, 3/08

    Features

    • Microcontroller Interface
    • SFP/SFF and SFF-8472 Compliant
    • 50 Mbps to 3.3 Gbps Operation
    • Closed Loop Control of Average Power and Extinction Ratio
    • Typical Rise/Fall-time 60 ps
    • Bias Current Range 2 to 100 mA
    • Modulation Current Range 5 to 90 mA
    • See Data Sheet for Additional Information

    Diagrams

    ADN2870 Diagram
    Functional Block Diagram for ADN2870

    Specifications

    Data Rate (Gbps) 3.3
    Voltage Supply (V) 3.3V
    Single Ended/Differential Both
    Package 4x4 mm LFCSP
    Modulation Current (mA) 90mA
    Laser Bias Current (mA) 100mA
    Rise/Fall Time (ps) 60ps
    Dual Loop X
    MSA Compliance SFP-SFF-8472

    ADN2873 - 3.3 V, 50 Mbps to 4.25 Gbps, Single-Loop, Laser Diode Driver

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    Part# Data Rate (Gbps) Voltage Supply (V) Laser Bias Current (mA) Single Ended/Differential Modulation Current (mA) Rise/Fall Time (ps) Dual Loop MSA Compliance Package Price* (1000-4999)
    ADN2525 10.7 3.3 100 Differential 80 24 - XFP, Xenpak, X2, MSA-300 3x3 mm LFCSP $21.14
    ADN2530 11.3 3.3 25 Differential 23 26 - - 3x3 mm LFCSP $15.49
    ADN2830 - 5 200 Single Ended - - - - 5x5 mm LFCSP $8.60
    ADN2841 2.7 5 100 Both 80 80 X SFF 5x5 mm LFCSP, 7x7 mm LFCSP $17.15
    ADN2847 3.3 3.3 100 Both 80 80 X SFF 5x5 mm LFCSP, 7x7 mm LFCSP $8.05
    ADN2848 1.25 3.3 100 Both 80 80 X SFF 5x5 mm LFCSP $5.85
    ADN2870 3.3 3.3 100 Both 90 60 X SFP-SFF-8472 4x4 mm LFCSP $5.31
    ADN2871 4.25 3.3 100 Both 90 60 - - 4x4 mm LFCSP $4.30

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
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    • Automotive: -40 to +125 degrees Celsius
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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 iinto your cart to check sample availability.

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