General Description

The MAX3286/MAX3296 series of products are high-

speed laser drivers for fiber optic LAN transmitters opti-

mized for Gigabit Ethernet applications. Each device

contains a bias generator, laser modulator, and com-

prehensive safety features. Automatic power control

(APC) adjusts the laser bias current to maintain aver-

age optical power at a constant level, regardless of

changes in temperature or laser properties. For lasers

without a monitor photodiode, these products offer a

constant-current mode. The circuit can be configured

for use with conventional shortwave (780nm to 850nm)

or longwave (1300nm) laser diodes, as well as vertical-

cavity surface-emitting lasers (VCSELs).

The MAX3286 series (MAX3286–MAX3289) is opti-

mized for operation at 1.25Gbps, and the MAX3296

series (MAX3296–MAX3299) is optimized for 2.5Gbps

operation. Each device can switch 30mA of laser mod-

ulation current at the specified data rate. Adjustable

temperature compensation is provided to keep the opti-

cal extinction ratio within specifications over the operat-

ing temperature range. This series of devices is

optimized to drive lasers packaged in low-cost TO-46

headers. Deterministic jitter (DJ) for the MAX3286 is

typically 22ps, allowing a 72% margin to Gigabit

Ethernet DJ specifications.

These laser drivers provide extensive safety features to

guarantee single-point fault tolerance. Safety features

include dual enable inputs, dual shutdown circuits, and

a laser-power monitor. The safety circuit detects faults

that could cause dangerous light output levels. A pro-

grammable power-on reset pulse initializes the laser

driver at startup.

The MAX3286/MAX3296 are available in a compact, 5mm

32-pin TQFP package; or in die form. The MAX3287/

MAX3288/MAX3289 and MAX3297/MAX3298/MAX3299

are available in a 16-pin TSSOP-EP package.

Applications

Gigabit Ethernet Optical Transmitter

Fibre Channel Optical Transmitter

ATM LAN Optical Transmitter

Features

♦ 7ps Deterministic Jitter (MAX3296)

22ps Deterministic Jitter (MAX3286)

♦ +3.0V to +5.5V Supply Voltage

♦ Selectable Laser Pinning (Common Cathode or

Common Anode) (MAX3286/MAX3296)

♦ 30mA Laser Modulation Current

♦ Temperature Compensation of Modulation Current

♦ Automatic Laser Power Control or Constant

Bias Current

♦ Integrated Safety Circuits

♦ Power-On Reset Signal

♦ QFN and Thin QFN Packages Available

3.0V to 5.5V, 1.25Gbps/2.5Gbps

LAN Laser Drivers

________________________________________________________________ Maxim Integrated Products

1

19-1550; Rev 6; 11/04

Ordering Information continued at end of data sheet.

Ordering Information

Typical Application Circuits and Selector Guide appear at

end of data sheet.

*Exposed pad is connected to GND.

Pin Configurations continued at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX3286CTI+

0°C to +70°C

28 Thin QFN

(5mm x 5mm)****

MAX3286CGI

0°C to +70°C

28 QFN

(5mm x 5mm)***

MAX3286CHJ

0°C to +70°C

32 TQFP

(5mm x 5mm)

15

16

17

18

19

20

21

POL

POL

MD

MON

GND

SHDNDRV

BIASDRV

7

6

5

4

3

2

1

PORDLY

EN

EN

GND

POR

FAULT

FAULT

MAX3286

MAX3296

THIN QFN*

TOP VIEW

+

Pin Configurations

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.

**Exposed pad.

***Package Code: G2855-1

****Package Code: T2855-7

+Denotes Lead-Free Package.