155Mbps to 2.5Gbps Burst-Mode Laser Driver

2ns Burst On/Off-Time for Any PON ONT Applications

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The MAX3643 burst-mode laser driver provides bias and modulation current drive for PON burst-mode ONT applications. It is specifically designed for use with a low-cost external controller for the APC (and if desired, AMC) loop. A high-speed differential burst-enable input enables the driver to switch the laser from a dark (output off) condition to full on condition in less than 2ns. When BEN is inactive, typical modulation and bias currents are 5µA each.

Laser modulation current can be set from 10mA to 85mA and bias current can be set from 1mA to 70mA using the MODSET and BIASSET inputs. A sample-and-hold circuit is provided to capture the monitor diode output during short PON bursts, if needed, and the BEN high-speed signal is mirrored on an LVCMOS output to be used by the controller operating the APC/AMC loop.

The MAX3643 burst-mode laser driver is packaged in a 4mm x 4mm, 24-pin thin QFN package. It operates from -40°C to +85°C.
MAX3643: Typical Application Circuit MAX3643: Typical Application Circuit Enlarge+

Key Features

  • 10mA to 85mA Modulation Current
  • 1mA to 70mA Bias Current
  • Monitor Diode Sample and Hold
  • 45ps Output Transition Time
  • 2ns Turn-On/Off Time
  • Reference Voltage Generator
  • LVPECL High-Speed Inputs (Data, Burst Enable)


  • 1.25Gbps IEEE EPON ONT Modules
  • A/B/G/XGPON ONT Modules Up to 2.5Gbps

See parametric specs for Laser Drivers (21)

Part NumberTarget Oper. Range
Data Rate
Data Rate
minmaxtypmaxmaxSee Notes
1 to 4.5
$2.23 @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.

MAX3643EVKIT: Evaluation Kit for the MAX3643
Product Reliability Reports: MAX3643.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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