+3.3V, 622Mbps SDH/SONET Laser Driver with Current Monitors and APC

Low-Power, Full-Featured 622Mbps Laser Driver

Please check latest availability status for a specific part variant.


The MAX3669 is a complete, +3.3V laser driver with automatic power control (APC) circuitry for SDH/SONET applications up to 622Mbps. It accepts differential PECL inputs, provides bias and modulation currents, and operates over a temperature range from -40°C to +85°C.

An APC feedback loop is incorporated to maintain a constant average optical power over temperature and lifetime. The wide modulation current range from 5mA to 75mA and bias current of 1mA to 80mA are easy to program, making this product ideal for use in various SDH/SONET applications. Two pins are provided to monitor the current levels in the laser: BIASMON with current proportional to laser bias current, and MODMON with current proportional to laser modulation.

The MAX3669 also provides enable control and a failure-monitor output to indicate when the APC loop is unable to maintain the average optical power. The MAX3669 is available in 4mm x 4mm 24-pin thin QFN and 5mm x 5mm 32-pin TQFP packages.
MAX3669: Typical Application Circuit MAX3669: Typical Application Circuit Enlarge+

Key Features

  • +3.3V or +5.0V Single-Supply Operation
  • 40mA Supply Current at +3.3V
  • Programmable Bias Current from 1mA to 80mA
  • Programmable Modulation Current from 5mA to 75mA
  • Bias Current and Modulation Current Monitors
  • 200ps Rise/Fall Time
  • Automatic Average Power Control with Failure Monitor
  • Complies with ANSI, ITU, and Bellcore SONET/SDH Specifications
  • Enable Control


  • 622Mbps SDH/SONET Access Nodes
  • Laser Driver Transmitters
  • Section Regenerators

See parametric specs for Laser Drivers (20)

Part NumberTarget Oper. Range
Data Rate
Data Rate
minmaxtypmaxmaxSee Notes
MAX3669 <1155622
$6.03 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3669EVKIT: Evaluation Kit for the MAX3669
MAX3669ETGEVKIT: Evaluation Kit for the MAX3669ETG

Technical Documents

App Note 596 HFAN-02.2.0: Extinction Ratio and Power Penalty
Product Reliability Reports: MAX3669.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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