• 简体中文
• English

MAX3646：155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control

Low-Cost 155Mbps Laser Driver with Extinction Ratio Control

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 transmit disable control (TX_DISABLE), single-point fault tolerance, bias-current monitoring, and photocurrent monitoring. The device also offers a latched failure output (TX_FAULT) to indicate faults, such as when the APC loop is no longer able to maintain the average optical power at the required level. The MAX3646 is compliant with the SFF-8472 transmitter diagnostic and SFP MSA timing requirements. The MAX3646 is offered in a 4mm x 4mm, 24-pin thin QFN package and operates over the extended -40°C to +85°C temperature range.

Key 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: Typical Application Circuit Applications/Uses 125Mbps Ethernet SFP, GBIC, and 1 x 9 Transceivers Multirate OC-3 to OC-12 FEC Transceivers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX3646EVKIT

Quality and Environmental Data

• MAX3646.pdf

Ordering Information