MAX3646
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MAX3646

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

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Low-Cost 155Mbps Laser Driver with Extinction Ratio Control

warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
warning : NOT RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $3.36
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
Additional Details
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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
Part Models 2
1ku List Price Starting From $3.36

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX3646ETG+
  • HTML
  • HTML
MAX3646ETG+T
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX3646EVKIT

Evaluation Kit for the MAX3646

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MAX3646EVKIT

Evaluation Kit for the MAX3646

Evaluation Kit for the MAX3646

Features and Benefits

  • Fully Assembled and Tested
  • Single +3.3V Power Supply Operation
  • AC-Coupling Provided On-Board
  • Allows Optical and Electrical Evaluation

Product Detail

The MAX3646 evaluation kit (EV kit) is an assembled demonstration board that provides complete optical and electrical evaluation of the MAX3646.

The EV kit is composed of two independent sections, one optical and one electrical, on the PC board. The output of the electrical evaluation section is interfaced to an SMP connector that can be connected to a 50Ω terminated oscilloscope. The output of the optical evaluation section is configured for attachment to a laser/monitor diode.

Applications

  • 125Mbps Ethernet SFP, GBIC, and 1 x 9 Transceivers
  • Multirate OC-3 to OC-12 FEC Transceivers

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