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MAX3867

+3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control

Maxim Integrated 

19-4769; Rev 0a; 9/98

EVAALVUAAILTAIOBNLEKIT

+3.3V, 2.5Gbps SDH/SONET Laser Driver

with Automatic Power Control

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

Ordering Information

PART

TEMP. RANGE PIN-PACKAGE

MAX3867ECM

-40°C to +85°C 48 TQFP

MAX3867E/D

-40°C to +85°C Dice*

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

guaranteed at TA = +25°C only. Contact factory for availability.

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

+3.3V

+3.3V

124Ω 124Ω 124Ω 124Ω

MAX3890

SERIALIZER

WITH

CLOCK GEN.

84.5Ω 84.5Ω 84.5Ω 84.5Ω

DATA+

DATA-

CLK+

MAX3867

CLK-

25Ω

OUT-

OUT+

BIAS

MD

LD

*FERRITE

BEAD

20Ω

0.056µF

1000pF

________________________________________________________________ Maxim Integrated Products 1

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.

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