MAX3646
NOT RECOMMENDED FOR NEW DESIGNS155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control
Low-Cost 155Mbps Laser Driver with Extinction Ratio Control
- Part Models
- 2
- 1ku List Price
- Starting From $3.36
Part Details
- 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
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.
Applications
- 125Mbps Ethernet SFP, GBIC, and 1 x 9 Transceivers
- Multirate OC-3 to OC-12 FEC Transceivers
Documentation
Data Sheet 1
Reliability Data 1
Design Note 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX3646ETG+ | 24-LFCSP-4X4X0.75 | ||
| MAX3646ETG+T | 24-LFCSP-4X4X0.75 |
This is the most up-to-date revision of the Data Sheet.
Evaluation Kits
Evaluation Kit for the MAX3646
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