Micrel SY88212L激光二极管驱动方案

Micrel 公司的SY88212L是单独使用的2.5Gbps激光二极管驱动器(LDD),它集成了自动功率控制(APC)和功率监视功能,使得温度变化时能保持光学平均功率不变. SY88212L具有高的兼容电压,能直流耦合到激光二极管以降低元件数量和功耗,同时适合SFF and SFP模块.因此,广泛用在通信和数据通信,包括数据速率高达2.5Gbps的LAN和MAN如FC, GbE, SONET, OC3/12/24/48 and SDH, STM 1/4/8.本文介绍了SY88212L的主要性能,方框图以及包括DC和AC耦合的典型应用电路.

SY88212L 3.3V, 2.5Gbps Laser Diode Driver with Integrated Bias and APC
The SY88212L is a single supply 3.3V laser driver for datacom and telecom applications with data rates from 155Mbps up to 2.5Gbps. The driver can deliver modulation current up to 85mA, and provides a high compliance voltage that makes it suitable for high-current operation with the laser DC-coupled to it. The drivers have integrated bias and Automatic Power Control (APC) functions.

主要特性:
2.4V minimum laser compliance voltage
Operation up to 2.5Gbps
Modulation current up to 85mA
Bias current up to 70mA
Power monitoring
Available in 24-pin (4mm x 4mm) MLF® package
Applications
Multi-rate LAN, MAN applications up to 2.5Gbps: FC, GbE, SONET OC3/12/24 and SDH STM1/4/8
SFF, SFP modules
Markets
Telecom, Datacom



图1. SY88212L功能方框图



图2. SY88212L典型应用电路图



图3. 激光管AC耦合到SY88212L的典型应用电路图