270Mbps SFP LED Driver

________________________________________________________________ Maxim Integrated Products

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TCNOM

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101112

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TC

PB1

PB2

PB3

N.C.

MON

MODSET

TOP VIEW

THE EXPOSED PAD MUST BE CONNECTED TO GROUND FOR

PROPER THERMAL AND ELECTRICAL PERFORMANCE

MAX3967

THIN QFN (4mm x 4mm)

Pin Configuration

19-3252; Rev 0; 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.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX3967ETG

-40°C to +85°C

24 Thin QFN

MAX3967E/D

-40°C to +85°C

Dice*

General Description

The MAX3967 is a programmable LED driver for fiber

optic transmitters operating at data rates up to

270Mbps. The circuit contains a high-speed current dri-

ver with programmable temperature coefficient (temp-

co), adjustments for LED prebias voltage, and a disable

feature. The circuit accepts PECL data inputs, and

operates from a single +2.97V to +5.5V power supply.

The SFP LED driver can switch up to 100mA into typical

high-speed light-emitting diodes. As temperature

increases, the device’s modulation current increases

with a tempco that is programmable from 2500ppm/°C

to 12,000ppm/°C. The modulation current is pro-

grammed with a single external resistor.

The MAX3967’s LED prebias voltage is programmable

from 400mV to 925mV. The prebias circuit produces

peaking current, which improves the LED switching

speed.

Complementary current outputs help to maintain a con-

stant supply current, reducing EMI and supply noise

generated by the transmitter module. The MAX3967 is

available in die form, or in a 4mm x 4mm, 24-pin thin

QFN package.

Applications

Multimode LED Transmitters

Fast Ethernet/FDDI

155Mbps LAN ATM Transceivers

ESCON Receivers

SFP Transceivers

Features

♦ TX_DISABLE for SFP Compatibility

♦ Single +2.97V to +5.5V Power Supply

♦ Adjustable Temperature Compensation

♦ Adjustable Modulation Current

♦ Complementary Output Reduces Supply Noise

♦ Programmable LED Prebias Voltage

♦ Available in 24-Pin QFN or Die

Typical Operating Circuits appear at end of data sheet.