General Description

The MAX3741 is a high-speed VCSEL driver for small-

form-factor (SFF) and small-form-factor pluggable (SFP)

fiber-optic LAN transmitters. It contains a bias generator,

laser modulator, and peaking current option to improve

VCSEL edge speed. The driver accommodates common

cathode and differential configurations.

The MAX3741 operates up to 3.2Gbps. It can switch up

to 15mA of laser modulation current and source up to

15mA of bias current. The MAX3741 is designed to inter-

face with a digital potentiometer and control circuitry.

The MAX3741 accommodates various VCSEL packages,

including low-cost TO-46 headers.

The MAX3741 is available in a compact 3mm x 3mm

16-pin thin QFN package and operates over a tempera-

ture range of -40°C to +85°C.

Applications

Multirate (1Gbps to 3.2Gbps) SFP/SFF Modules

Gigabit Ethernet Optical Transmitters

Fibre Channel Optical Transmitters

Features

o 2mA to 15mA Modulation Current

o 1mA to 15mA Bias Current

o Optional Peaking Current to Improve VCSEL Edge

Speed

o Supports Common Cathode and Differential

Configuration

o 3mm × 3mm 16-Pin Thin QFN Package

3.2Gbps Compact SFP VCSEL Driver

________________________________________________________________ Maxim Integrated Products

1

EXPOSED PAD IS CONNECTED TO GND.

16

1

2

3

4

12

11

10

9

15

14

13

56

7

8

BIASMON

OUT+

OUT-

IN+

IN-

N.C.

TX_DISABLE

TOP VIEW

MAX3741

3mm x 3mm

THIN QFN

Pin Configuration

Ordering Information

THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF

CHARACTERISTIC IMPEDANCE Zo = 50

Ω.

* FERRITE BEAD, MURATA BLM18HD102SN1B

PEAKSET

MODSET

GND

IN+

IN-

TX_DISABLE

BIASSET

+3.3V

0.01

µF

0.1

µF

0.1

µF

0.01

µF

L1*

BIAS

OUT-

OUT+

BIASMON

50

Ω

0.01

µF

MAX3741

Typical Application Circuit

19-2597; Rev 1; 5/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP

RANGE

PIN-

PACKAGE

PKG.

CODE

MAX3741ETE

-40

°C to +85°C

16 Thin QFN

T1633F-3