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270Mbps SFP LED Driver

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Data Sheet 270Mbps SFP LED Driver May 26, 2004

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Key Features

  • TX_DISABLE for SFP Compatibility
  • Single +2.97V to +5.5V Power Supply
  • Adjustable Temperature Compensation
  • Adjustable Modulation Current
  • Complementary Output Reduces Supply Noise
  • Programmable LED Prebias Voltage
  • Available in 24-Pin QFN or Die

Applications/Uses

  • 155Mbps LAN ATM Transceivers
  • ESCON Receivers
  • Fast Ethernet/FDDI
  • Multimode LED Transmitters
  • SFP Transceivers

Description

The MAX3967 is a programmable LED driver for fiber optic transmitters operating at data rates up to 270Mbps. The circuit contains a high-speed current driver with programmable temperature coefficient (tempco), adjustments for LED prebias voltage, and a disable feature. The circuit accepts PECL data inputs, and operates from a single +2.97V to +5.5V power supply.

The SFP LED driver can switch up to 100mA into typical high-speed light-emitting diodes. As temperature increases, the device's modulation current increases with a tempco that is programmable from 2500ppm/°C to 12,000ppm/°C. The modulation current is programmed with a single external resistor.

The MAX3967's LED prebias voltage is programmable from 400mV to 925mV. The prebias circuit produces peaking current, which improves the LED switching speed.

Complementary current outputs help to maintain a constant supply current, reducing EMI and supply noise generated by the transmitter module. The MAX3967 is available in die form, or in a 4mm x 4mm, 24-pin thin QFN package.

Simplified Block Diagram

MAX3967: Functional Diagram MAX3967: Functional Diagram Zoom icon

Technical Docs

Data Sheet 270Mbps SFP LED Driver May 26, 2004

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .