LDD with 25 Ω Differential NEC 10 G TOSA ADN2525 Performance Data DESCRIPTION This document provides performance data on the ADN2525 10.7 G active back-termination laser diode driver operating with the NEC NX8341UJ differential 10 G DFB laser. The ADN2525 laser diode driver is designed for direct modulation of packaged laser diodes that have a differential resistance ranging from 5 Ω to 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 small package provides the optimum solution for compact modules where laser diodes are packaged in low pin count optical subassemblies. Please refer to the ADN2525 data sheet for more information. The NEC NX8341UJ is a 25 Ω differential LC-TOSA for Ethernet applications. It is edge mounted on an ADN2525 optical demo board. This board is available for purchase in limited quantities from ADI. Contact ADI sales for pricing and availability of the evaluation boards; contact NEC Compound Semiconductor Devices for information regarding the laser TOSA. Data includes filtered and unfiltered eye diagrams, optical eye margin, and power consumption at SONET and Ethernet data rates for temperatures of −5°C, +25°C, and +85°C. Table 1. Demo Board Selection Model EVAL-ADN2525-O-NEC EVAL-ADN2525-O Description ADN2525 10 G optical evaluation board with NEC NX8341UJ differential LC TOSA ADN2525 10 G optical evaluation board without TOSA Figure 1. Board Used to Evaluate the NEC TOSA with the ADN2525 Rev. 0 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 ©2005 Analog Devices, Inc. All rights reserved. ADN2525 Performance Data VCC ALS VCC ADN2525 VCC 50Ω IMODP 50Ω IMOD 50Ω GND IMODN VCC DATAP DATAN IBMON IBIAS 800Ω 800Ω 200Ω MSET GND 200Ω 2Ω 02461-001 200Ω BSET Figure 2. Functional Block Diagram of the ADN2525 VCC GND BSET R5 1kΩ GND C5 10nF TP1 L1 R1 L8 R4 VCC VCC BSET IBMON IBIAS GND VCC VCC Z0 = 50Ω VCC L2 L7 Z0 = 25Ω DATAP DATAP Z0 = 25Ω IMODP C1 C4 GND ADN2525 TOSA Z0 = 50Ω Z0 = 25Ω DATAN DATAN IMODN C2 VCC VCC MSET NC1 Z0 = 25Ω ALS VCC GND GND L3 VCC C3 L6 VCC C6 10nF +3.3V VCC C7 20μF GND ALS L4 R2 L5 R3 GND VCC Figure 3. Typical ADN2525 Application Circuit Rev. 0 | Page 2 of 14 VCC 02461-033 MSET Performance Data ADN2525 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 653.4 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 25°C 41% mask margin Total ICC = 198 mA Mod = 27.14 mA Bias = 30 mA Figure 4. 41% Mask Margin (25°C) Rev. 0 | Page 3 of 14 ADN2525 Performance Data 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 653.4 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 25°C Unfiltered eye Total ICC = 198 mA Mod = 27.14 mA Bias = 30 mA Figure 5. Unfiltered Eye (25°C) Rev. 0 | Page 4 of 14 Performance Data ADN2525 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 772.2 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 85°C 42% mask margin Total ICC = 234 mA Mod = 38.64 mA Bias = 55 mA Figure 6. 42% Mask Margin (85°C) Rev. 0 | Page 5 of 14 ADN2525 Performance Data 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 772.2 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 85°C Unfiltered eye Total ICC = 234 mA Mod = 38.64 mA Bias = 55 mA Figure 7. Unfiltered Eye (85°C) Rev. 0 | Page 6 of 14 Performance Data ADN2525 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 650.1 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 −5°C 40% mask margin Total ICC = 197 mA Mod = 28.175 mA Bias = 29 mA Figure 8. 40% Mask Margin (−5°C) Rev. 0 | Page 7 of 14 ADN2525 Performance Data 10 Gb ETHERNET, PAV = –2 dBm, ER = 5 dB VCC = 3.3 V Total transmitter power dissipation is 650.1 mW Bit rate 10.3125 Gbps PRBS = 2^31 − 1 −5°C Unfiltered eye Total ICC = 197 mA Mod = 28.175 mA Bias = 29 mA Figure 9. Unfiltered Eye (−5°C) Rev. 0 | Page 8 of 14 Performance Data ADN2525 FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 673.2 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 25°C 17% mask margin Total ICC = 204 mA Mod = 36.11 mA Bias = 30 mA Figure 10. 17% Mask Margin (25°C) Rev. 0 | Page 9 of 14 ADN2525 Performance Data FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 673.2 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 25°C Unfiltered eye Total ICC = 204 mA Mod = 36.11 mA Bias = 30 mA Figure 11. Unfiltered Eye (25°C) Rev. 0 | Page 10 of 14 Performance Data ADN2525 FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 795.3 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 85°C 18% mask margin Total ICC = 241 mA Mod = 50.715 mA Bias = 54 mA Figure 12. 18% Mask Margin (85°C) Rev. 0 | Page 11 of 14 ADN2525 Performance Data FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 795.3 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 85°C Unfiltered eye Total ICC = 241 mA Mod = 50.715 mA Bias = 54 mA Figure 13. Unfiltered Eye (85°C) Rev. 0 | Page 12 of 14 Performance Data ADN2525 FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 669.9 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 −5°C 17% mask margin Total ICC = 203 mA Mod = 37.145 mA Bias = 29 mA Figure 14. 17% Mask Margin (−5°C) Rev. 0 | Page 13 of 14 ADN2525 Performance Data FOR REFERENCE: SONET OC192, PAV = –2 dBm, ER = 7 dB VCC = 3.3 V Total transmitter power dissipation is 669.9 mW Bit rate 9.95 Gbps PRBS = 2^31 − 1 −5°C Unfiltered eye Total ICC = 203 mA Mod = 37.145 mA Bias = 29 mA Figure 15. Unfiltered Eye (−5°C) ©2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. T05583–0–6/05(0) Rev. 0 | Page 14 of 14