General Description

The MAX3867 is a complete, single +3.3V laser driver

for SDH/SONET applications up to 2.5Gbps. The

device accepts differential PECL data and clock inputs

and provides bias and modulation currents for driving a

laser. The synchronizing input latch can be bypassed if

a clock signal is not available.

An automatic power control (APC) feedback loop is

incorporated to maintain a constant average optical

power over temperature and lifetime. The wide modula-

tion current range of 5mA to 60mA and bias current of

1mA to 100mA are easy to program, making this prod-

uct ideal for use in various SDH/SONET applications.

The MAX3867 also provides enable control, a program-

mable slow-start circuit to set the laser turn-on delay,

and a failure-monitor output to indicate when the APC

loop is unable to maintain the average optical power.

The MAX3867 is available in a small 48-pin TQFP pack-

age as well as dice.

Applications

SONET/SDH Transmission Systems

Add/Drop Multiplexers

Digital Cross-Connects

Section Regenerators

2.5Gbps Optical Transmitters

Features

o Single +3.3V or +5V Power Supply

o 62mA Supply Current at +3.3V

o Programmable Modulation Current from

5mA to 60mA

o Programmable Bias Current from 1mA to 100mA

o Rise/Fall Time < 90ps

o Automatic Average Power Control with Failure

Monitor

o Complies with ANSI, ITU, and Bellcore

SDH/SONET Specifications

o Enable Control

*

Dice are designed to operate over this range, but are tested and

Ordering Information

+3.3V, 2.5Gbps SDH/SONET Laser Driver

with Automatic Power Control

________________________________________________________________

Maxim Integrated Products

1

EVALUATION

KIT

AVAILABLE

124

Ω

124

Ω

SERIALIZER

WITH

CLOCK GEN.

124

Ω

20

Ω

LD

25

Ω

+3.3V

+3.3V

0.056

µF

1000pF

CLK-

CLK+

DATA-

DATA+

*FERRITE

BEAD

OUT+

BIAS

MD

OUT-

124

Ω

84.5

Ω

84.5

Ω

84.5

Ω

84.5

Ω

MAX3867

MAX3890

Typical Operating Circuit

19-4769; Rev 0a; 9/98

Pin Configuration appears at end of data sheet.

PART

MAX3867ECM

MAX3867E/D

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

48 TQFP

Dice*

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.