ADN2530 10G-BASE-LRM OC-192/SDH STM-64 PE-9436 PE-7046 PRBS31 HFE6192-562

Differential VCSEL Driver ADN2530 FEATURES GENERAL DESCRIPTION Up to 11.3 Gbps operation -40°C to +100°C operation Very

11.3 Gbps, Active Back-Termination, Differential VCSEL Driver ADN2530 ADN2530 FEATURES GENERAL DESCRIPTION Up to 11.3 Gbps operation -40°C to +100°C operation Very low power: ISUPPLY = 65 mA Typical 26 ps rise/fall times Full back-termination of output transmission lines Crosspoint adjust function PECL-/CML-compatible data inputs Bias current range: 2 mA to 25 mA Differential modulation current range: 2.2 mA to 23 mA Automatic laser shutdown (ALS) 3.3 V operation Compact 3 mm × 3 mm LFCSP Voltage-input control for bias and modulation currents XFP-compliant bias current monitor The ADN2530 ADN2530 laser diode driver is designed for direct modulation of packaged VCSELs with a differential resistance ranging from 35 to 140 . 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 ADN2530 ADN2530 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 eye crosspoint in the output eye diagram is adjustable via the crosspoint adjust (CPA) control voltage input. 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 +100°C. APPLICATIONS 10 Gb Ethernet optical transceivers 10G-BASE-LRM 10G-BASE-LRM optical transceivers 8× and 10× Fibre Channel optical transceivers XFP/X2/XENPAK/MSA 300 optical modules SONET OC-192/SDH OC-192/SDH STM-64 STM-64 optical transceivers FUNCTIONAL BLOCK DIAGRAM VCC CPA ALS VCC ADN2530 ADN2530 VCC 50 IMODP 50 100 IMOD IMODN GND DATAP VCC CROSS POINT ADJUST DATAN IBMON IBIAS 800 200 200 MSET GND BSET 200 10 05457-001 800 Figure 1. Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. ADN2530 ADN2530 TABLE OF CONTENTS Features . 1 Automatic Laser Shutdown (ALS) . 11 Applications. 1 Modulation Current. 11 General Description . 1 Load Mistermination . 13 Functional Block Diagram . 1 Crosspoint Adjust. 13 Revision History . 2 Power Consumption . 13 Specifications. 3 Applications Information . 15 Package Thermal Specifications . 4 Typical Application Circuit. 15 Absolute Maximum Ratings. 5 Layout Guidelines. 15 ESD Caution. 5 Design Example. 16 Pin Configuration and Function Descriptions. 6 Headroom Calculations . 16 Typical Performance Characteristics . 7 BSET and MSET Pin Voltage Calculation . 16 Theory of Operation . 10 IBIAS Monitor Accuracy Calculations. 17 Input Stage. 10 Outline Dimensions . 18 Bias Current . 10 Ordering Guide . 18 REVISION HISTORY 8/06-Rev. 0 to Rev. A Changes to Figure 1. 1 Changes to Table 3. 5 Changes to Figure 24. 10 Changes to Figure 30. 11 Changes to Modulation Current Section . 12 Changes to Typical Application Circuit Section. 15 10/05-Revision 0: Initial Version Rev. A | Page 2 of 20 ADN2530 ADN2530 SPECIFICATIONS VCC = VCCMIN to VCCMAX, TA = -40°C to +100°C, 100 differential load impedance, crosspoint adjust disabled, unless otherwise noted. Typical values are specified at 25°C and IMOD = 10 mA with crosspoint adjust disabled, unless otherwise noted. Table 1. Parameter BIAS CURRENT (IBIAS) Bias Current Range Bias Current While ALS Asserted Compliance Voltage 1 MODULATION CURRENT (IMODP, IMODN) Modulation Current Range Modulation Current While ALS Asserted Crosspoint Adjust (CPA) Range 2 Rise Time (20% to 80%)2, 3, 4 Min 0.55 0.55 2.2 2.2 35 26 26.4 26 26.5