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  2. Optical Communications and Sensing
  3. Fiber Optic Data
  4. Laser Drivers
  5. MAX3798


Features and Benefits

  • Low Power Dissipation of 320mW at 3.3V Power Supply
  • Up to 10.32Gbps (NRZ) Operation
  • 3mVP-P Receiver Sensitivity at 10.32Gbps
  • 4psP-P DJ at Receiver Output at 8.5Gbps 8B/10B
  • 4psP-P DJ at Receiver Output at 10.32Gbps 231 - 1 PRBS
  • 26ps Rise and Fall Time at Rx/Tx Output
  • Mode Select for High-Gain Mode and High-Bandwidth Mode
  • CML Output Slew-Rate Adjustment for High-Gain Mode
  • CML Output with Continuous Level Adjustment
  • CML Output Squelch
  • Polarity Select for Rx and Tx
  • LOS Assert Level Adjustment
  • LOS Polarity Select
  • Modulation Current Up to 12mA Into 100Ω Differential Load
  • Bias Current Up to 15mA
  • Integrated Eye Safety Features
  • Selectable Deemphasis at Rx Output
  • 3-Wire Digital Interface
  • Eye-Crossing Adjustment of Modulation Output
  • Programmable Deemphasis at Tx Output
  • Fast Mode-Select Change Time of 10µs

Product Details

The MAX3798 is a highly integrated limiting amplifier and VCSEL driver designed for 1x/2x/4x/8x Fibre Channel transmission systems at data rates up to 8.5Gbps as well as for 10GBASE-SR transmission systems at a data rate of 10.3125Gbps. Operating from a single +3.3V supply, this low-power integrated limiting amplifier and VCSEL driver IC enables a platform design for SFP MSA as well as for SFP+ MSA-based optical transceivers. The high-sensitivity limiting amplifier limits the differential input signal generated by a transimpedance amplifier into a CML-level differential output signal. The compact VCSEL driver provides a modulation and a bias current for a VCSEL diode. The optical average power is controlled by an average power control (APC) loop implemented by a controller that interfaces to the VCSEL driver through a 3-wire digital interface. All differential I/Os are optimally back-terminated for a 50Ω transmission line PCB design.

The use of a 3-wire digital interface reduces the pin count while enabling advanced Rx (mode selection, LOS threshold, LOS squelch, LOS polarity, CML output level, signal path polarity, slew-rate control, deemphasis, and fast mode-select change time) and Tx settings (modulation current, bias current, polarity, programmable deemphasis, eye-crossing adjustment, and eye safety control) without the need for external components. The MAX3798 provides multiple current and voltage DACs to allow the use of low-cost controller ICs.

The MAX3798 is packaged in a lead-free, 5mm x 5mm, 32-pin TQFN package.


  • 10GBASE-LR SFP+ Optical Transceiver (1310nm VCSEL)
  • 10GBASE-LRM SFP+ Optical Transceiver (1310nm VCSEL)
  • 10GBASE-SR SFP+ Optical Transceiver
  • 1x/2x/4x/8x SFF/SFP/SFP+ MSA Fibre Channel (FC) Optical Transceiver

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Evaluation Kits (1)

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX3798ETJ+ Material Declaration Reliability Data 32-LFCSP-5X5X0.75
MAX3798ETJ+T Material Declaration Reliability Data 32-LFCSP-5X5X0.75
Wafer Fabrication Data MAX3798 Reliability Data

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