MAX3949

NOT RECOMMENDED FOR NEW DESIGNS

11.3Gbps, Low-Power, AC-Coupled Laser Driver

182mW 10GBASE-LR Laser Driver Beats 1W SFP+ Spec

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.56

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Overview

Low Power Consumption
Saves Board Space
- Small 3mm x 3mm Package
Flexibility
- Programmable Modulation Current Up to 85mA (5Ω Load)
- Programmable Bias Current Up to 105mA
- Programmable Input Equalization and Output Deemphasis
Safety
- Supports SFF-8431 SFP+ MSA and SFF-8472 Digital Diagnostic
- Integrated Eye Safety Features with Maskable Faults
- Bias Current Monitor

The MAX3949 is a 3.3V, multirate, low-power laser diode driver designed for Ethernet, Fibre Channel, and SONET transmission systems at data rates up to 11.3Gbps. This device is optimized to drive a differential transmitter optical subassembly (TOSA) with a 25Ω flex circuit. The unique design of the output stage enables use of unmatched TOSAs.

The device receives differential AC-coupled signals with on-chip termination. It can deliver laser modulation currents of up to 85mA at an edge speed of 22ps (20% to 80%) into a 5Ω external differential load. The device is designed to have a high-bandwidth differential signal path with on-chip back termination resistors integrated into its outputs. An input equalization block can be activated to compensate for SFP+ host connector losses. The integrated bias circuit provides programmable laser bias currents up to 105mA. Both the laser bias current generator and the laser modulator can be disabled from a single pin.

The use of a 3-wire digital interface reduces the pin count while permitting adjustment of input equalization, polarity, output deemphasis, and modulation and bias currents without the need for external components. The device is available in a 3mm x 3mm, 16-pin TQFN package, and is specified for the -40°C to +95°C extended temperature range.

Applications

10GBASE-LR SFP+ Optical Transceivers
10GBASE-LRM SFP+ Optical Transceivers
OC192-SR SFP+ SDH/SONET Transceivers

Part Models: 2
1ku List Price: Starting From $3.56

Documentation

Data Sheet 1

MAX3949: 11.3Gbps, Low-Power, AC-Coupled Laser Driver Data Sheet (Rev.1) 02/20/2017

Reliability Data 1

MAX3949 Reliability Data 01/12/2023

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX3949ETE+	16-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX3949ETE+T	16-LFCSP-3X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX3949ETE+
MAX3949ETE+T
Aug 14, 2023 - 2275A WAFER FAB
		pcn_2275a
MAX3949ETE+
MAX3949ETE+T
Dec 13, 2013 - 1355 MECHANICAL DATASHEET
		pcn_1355
MAX3949ETE+
MAX3949ETE+T

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

Software Development 1

MAX3949EVKIT Software, 1.0.0

Evaluation Kits

Evaluation Kit for the MAX3949

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Features and Benefits

Drives Differentially Connected Lasers
Software Control of the IC
Power Supplied through the USB or External Connection
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX3949 evaluation kit (EV kit) is a fully tested and assembled demonstration board that provides optical evaluation of the MAX3949 AC-coupled, 1Gbps to 11.3Gbps laser driver. The controlling software communicates with the EV kit through the USB port and provides simplified control of all functions of the IC. The EV kit can be fully powered by the USB port or the user can choose to power the IC by a single external 3.3V supply, while the USB port supplies the on-board microcontroller. The flex-cable connection on the evaluation board allows attachment of lasers incorporating flex cables.