10Gbps EAM Driver with Integrated Bias Network

10.7Gbps Packaged Electro-Absorption Modulator (EAM) Driver with Integrated Bias T

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The MAX3941 is designed to drive an electro-absorption modulator (EAM) at data rates up to 10.7Gbps. It incorporates the functions of a biasing circuit and a modulation circuit, with integrated control op amps externally programmed by DC voltages.

The integrated bias circuit provides a programmable biasing current up to 50mA. This bias current reflects a bias voltage of up to 1.25V on an external 50Ω load. The bias and modulation circuits are internally connected on chip, eliminating the need for an external bias inductor.

A high-bandwidth, fully differential signal path is internally implemented to minimize jitter accumulation. When a clock signal is available, the integrated data-retiming function can be selected to reject input-signal jitter. The MAX3941 receives differential CML signals (ground referenced) with on-chip line terminations of 50Ω. The output has a 50Ω resistor for back termination and is able to deliver a modulation current of 40mAP-P to 120mAP-P, with an edge speed of 23ps (20% to 80% typ). This modulation current reflects an EAM modulation voltage of 1.0VP-P to 3.0VP-P.

The MAX3941 also includes an adjustable pulse-width control circuit to precompensate for asymmetrical EAM characteristics. It is available in a compact 4mm x 4mm, 24-pin thin QFN package and operates over the -40°C to +85°C temperature range.
MAX3941: Typical Application Circuit MAX3941: Typical Application Circuit Enlarge+

Key Features

  • On-Chip Bias Network
  • 23ps Edge Speed
  • Programmable Modulation Voltage Up to 3VP-P
  • Programmable EAM Biasing Voltage Up to 1.25V
  • Selectable Data-Retiming Latch
  • Up to 10.7Gbps Operation
  • Integrated Modulation and Biasing Functions
  • 50Ω On-Chip Input and Output Terminations
  • Pulse-Width Adjustment
  • Enable and Polarity Controls
  • ESD Protection


  • 10Gbps Ethernet
  • DWDM Systems
  • Long/Short-Reach Optical Transmitters
  • SONET OC-192 and SDH STM-64
  • Transmission Systems

See parametric specs for Laser Drivers (21)

Part NumberTarget Oper. Range
Data Rate
maxtypmaxmaxSee Notes
MAX3941 5 to >1010700-5.2140
$80.97 @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.

MAX3941EVKIT: Evaluation Kit for the MAX3941
Product Reliability Reports: MAX3941.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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