基于MAX3946的10Gbps低功耗激光二极管驱动方案

2011-05-15 09:24:06来源: 互联网 关键字:二极管

Maxim 公司的MAX3946是+3.3V多速率低功耗激光二极管驱动器,数据速率高11.3Gbps,支持SFF-8431 SFP+ MSA 和and SFF-8472,3.3V时的功耗为225mW,可编程调制电流从10mA到100mA,可编程偏压电流从5mA到80mA,以及可编程输入均衡和输出去加重。

MAX3946应用在4x/8x FC SFP+ 光收发器,10GFC SFP+光收发器,10GBASE-LR SFP+光收发器,10GBASE-LRM SFP+光收发器和OC192-SR XFP/SFP+收发器。本文介绍MAX3946主要特性和方框图,AC测试电路图,眼安全电路图以及10GBASE-LRM应用电路图和10GBASE-LR应用电路图。

The MAX3946 is a +3.3V, multirate, low-power laser diode driver designed for Ethernet and Fibre Channel transmission systems at data rates up to 11.3Gbps. This device is optimized to drive a differential transmit­ter optical subassembly (TOSA) with a 25I flex circuit. The unique design of the output stage enables use of unmatched TOSAs, greatly reducing headroom limita­tions and lowering power consumption.

The device receives differential CML-compatible signals with on-chip line termination. It can deliver laser modula­tion current of up to 80mA, at an edge speed of 20ps (20% to 80%), into a 5I to 25I external differential load. The device is designed to have a symmetrical output stage with on-chip back terminations integrated into its outputs. A high-bandwidth, fully differential signal path is implemented to minimize deterministic jitter. An equalization block can be activated to compensate for the SFP+ connector. The integrated bias circuit provides programmable laser bias current up to 80mA. Both the laser bias generator and the laser modulator can be dis­abled from a single pin, DISABLE.

A 3-wire digital interface reduces the pin count and permits adjustment of input equalization, pulse-width adjustment, Tx polarity, Tx deemphasis, modulation cur­rent, and bias current without the need for external com­ponents. The MAX3946 is available in a 4mm x 4mm, 24-pin TQFN package.

MAX3946主要特性:

225mW Power Dissipation Enables < 1W SFP+ Modules

Up to 100mW Power Consumption Reduction by Enabling the Use of Unmatched FP/DFB TOSAs

Supports SFF-8431 SFP+ MSA and SFF-8472 Digital Diagnostic

225mW Power Dissipation at 3.3V (IMOD = 40mA, IBIAS = 60mA Assuming 25I TOSA)

Single +3.3V Power Supply

Up to 11.3Gbps (NRZ) Operation

Programmable Modulation Current from 10mA to 100mA (5I Load)

Programmable Bias Current from 5mA to 80mA

Programmable Input Equalization

Programmable Output Deemphasis

25I Output Back Termination at TOUT+ and TOUT-

DJ Performance 7psP-P with Mismatched Differential Load (5I)

DJ Performance 5psP-P with Mismatched Differential Load (25I)

DJ Performance 5psP-P with 50I Differential Load

Programmable Pulse Width

Edge Transition Times of 20ps

Bias Current Monitor

Integrated Eye Safety Features

3-Wire Digital Interface

-40℃ to +95℃ Operation

MAX3946应用:

4x/8x FC SFP+ Optical Transceivers

10GFC SFP+ Optical Transceivers

10GBASE-LR SFP+ Optical Transceivers

10GBASE-LRM SFP+ Optical Transceivers
 
OC192-SR XFP/SFP+ Transceivers

图1。MAX3946功能方框图

图2。MAX3946 AC测试电路图

图3。MAX3946眼安全电路图

图4。MAX3946 10GBASE-LRM应用电路图

图5。MAX3946 10GBASE-LR应用电路图

关键字:二极管

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2011/0515/article_8524.html
本网站转载的所有的文章、图片、音频视频文件等资料的版权归版权所有人所有,本站采用的非本站原创文章及图片等内容无法一一联系确认版权者。如果本网所选内容的文章作者及编辑认为其作品不宜公开自由传播,或不应无偿使用,请及时通过电子邮件或电话通知我们,以迅速采取适当措施,避免给双方造成不必要的经济损失。

上一篇:基于dsPIC33F GS系列的1KVA离线UPS参考设计方
下一篇:闪烁灯电路的设计图解

关注eeworld公众号 快捷获取更多信息
关注eeworld公众号
快捷获取更多信息
关注eeworld服务号 享受更多官方福利
关注eeworld服务号
享受更多官方福利
推荐阅读
全部
二极管

小广播

独家专题更多

2017东芝PCIM在线展会
2017东芝PCIM在线展会
TI车载信息娱乐系统的音视频解决方案
TI车载信息娱乐系统的音视频解决方案
汇总了TI汽车信息娱乐系统方案、优质音频解决方案、汽车娱乐系统和仪表盘参考设计相关的文档、视频等资源
迎接创新的黄金时代 无创想,不奇迹
迎接创新的黄金时代 无创想,不奇迹
​TE工程师帮助将不可能变成可能,通过技术突破,使世界更加清洁、安全和美好。
电子工程世界版权所有 京ICP证060456号 京ICP备10001474号 电信业务审批[2006]字第258号函 京公海网安备110108001534 Copyright © 2005-2017 EEWORLD.com.cn, Inc. All rights reserved