LTC5100 - 3.3V, 3.2Gbps VCSEL Driver


  • 60ps Rise and Fall Times, 10ps Deterministic Jitter
  • 155Mbps to 3.2Gbps Laser Diode Driver for VCSELs*
  • Eye Diagram is Stable and Consistent Across Modulation Range and Temperature
  • 1mA to 12mA Modulation Current
  • Easy Board Layout, Laser can be Remotely Located if Desired
  • No Input Matching or AC Coupling Components Needed
  • On-Chip ADC for Monitoring Critical Parameters
  • Digital Setup and Control with I²C™ Serial Interface
  • Emulation and Set-Up Software Available**
  • Operates Standalone or with a Microprocessor
  • On-Chip DACs Eliminate External Potentiometers
  • Constant Current or Automatic Power Control
  • First and Second Order Temperature Compensation
  • On-Chip Temperature Sensor
  • Extensive Eye Safety Features
  • Single 3.3V Supply
  • 4mm x 4mm QFN Package

Typical Application

LTC5100 Typical Application
LTC5100 Typical Application


The LTC®5100 is a 3.2Gbps VCSEL driver offering an unprecedented level of integration and high speed performance. The part incorporates a full range of features to ensure consistently outstanding eye diagrams. The data inputs are AC coupled, eliminating the need for external capacitors. The LTC5100 has a precisely controlled 50 Ohm output that is DC coupled to the laser, allowing arbitrary placement of the IC. No coupling capacitors, ferrite beads or external transistors are needed, simplifying layout, reducing board area and the risk of signal corruption. The unique output stage of the LTC5100 confines the modulation current to the ground system, isolating the high speed signal from the power supply to minimize RFI.

The LTC5100 supports fully automated production with its extensive monitoring and control features. Integrated 10-bit DACs eliminate the need for external potentiometers. An onboard 10-bit ADC provides the laser current and voltage, as well as monitor diode current and temperature. Status information is available from the I²C serial interface for feedback and statistical process control.

An internal digital controller compensates laser temperature drift and provides extensive laser safety features.

I²C is a trademark of Philips Electronics N.V. *Vertical Cavity Surface Emitting Laser **Downloadable from


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC5100EUF#PBF 4x4 QFN-16 UF E 05-08-1692 Yes
LTC5100EUF#TRPBF 4x4 QFN-16 UF E 05-08-1692 Yes

LTC5100 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC5100EUF#PBF 4x4 QFN-16 E $7.36 $5.15 Yes
LTC5100EUF#TRPBF 4x4 QFN-16 E $5.25 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


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