MAX3646

www.DataSheet4U.com 19-3161; Rev 1; 7/04 KIT ATION EVALU E L B A AVAIL 155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control General Description Features ♦ Single +3.3V Power Supply ♦ 47mA Power-Supply Current ♦ 85mA Modulation Current ♦ 100mA Bias Current ♦ Automatic Power Control (APC) ♦ Modulation Compensation ♦ On-Chip Temperature Compensation ♦ Self-Biased Inputs for AC-Coupling ♦ Ground-Referenced Current Monitors ♦ Laser Shutdown and Alarm Outputs ♦ Enable Control and Laser Safety Feature MAX3646 The MAX3646 is a +3.3V laser driver designed for multirate transceiver modules with data rates from 155Mbps to 622Mbps. Lasers can be DC-coupled to the MAX3646 for reduced component count and ease of multirate operation. Laser extinction ratio control (ERC) combines the features of automatic power control (APC), modulation compensation, and built-in thermal compensation. The APC loop maintains constant average optical power. Modulation compensation increases the modulation current in proportion to the bias current. These control loops, combined with thermal compensation, maintain a constant optical extinction ratio over temperature and lifetime. The MAX3646 accepts differential data input signals. The wide 5mA to 60mA (up to 85mA AC-coupled) modulation current range and up to 100mA bias current range, make the MAX3646 ideal for driving FP/DFB lasers in fiber optic modules. External resistors set the required laser current levels. The MAX3646 provides transm...