MAX3940

10Gbps EAM Driver with Integrated Bias Network

10.7Gbps Electro-Absorption Modulator (EAM) Driver with Integrated Modulation and Biasing Functions


Please check latest availability status for a specific part variant.

Description

The MAX3940 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 MAX3940 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 (typical, 20% to 80%). This modulation current reflects an EAM modulation voltage of 1.0VP-P to 3.0VP-P.

The MAX3940 also includes an adjustable pulse-width control circuit to precompensate for asymmetrical EAM characteristics.
MAX3940: Typical Application Circuit MAX3940: 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

Applications/Uses

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

Technical Documents

App Note 1816 HFAN-02.0.2: Laser Diode to Single-Mode Fiber Coupling Efficiency: Part 1 - Butt Coupling

Quality and Environmental Data

Request Reliability Report for: MAX3940 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX3940E_D IBIS Model
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources