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MAX3869E/D

+3.3V, 2.5Gbps SDH/SONET Laser Driver with Current Monitors and APC

Maxim Integrated 

19-1570; Rev 4; 1/05

EVAALVUAAILTAIOBNLEKIT

+3.3V, 2.5Gbps SDH/SONET Laser Driver

with Current Monitors and APC

General Description

The MAX3869 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. A synchronizing input latch can be used (if a

clock signal is available) to reduce jitter.

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 MAX3869 also provides enable control, two current

monitors that are directly proportional to the laser bias and

modulation currents, and a failure-monitor output to indi-

cate when the APC loop is unable to maintain the average

optical power. The MAX3869 is available in 32-pin TQFP

and small 32-pin QFN packages as well as dice.

Applications

SONET/SDH Transmission Systems

Add/Drop Multiplexers

Digital Cross-Connects

Section Regenerators

2.5Gbps Optical Transmitters

Pin Configuration appears at end of data sheet.

+3.3V

124Ω 124Ω 124Ω 124Ω

MAX3890

SERIALIZER

WITH

CLOCK GEN.

84.5Ω 84.5Ω 84.5Ω 84.5Ω

DATA+

DATA-

CLK+

CLK-

Features

♦ Single +3.3V or +5V Power Supply

♦ 64mA Supply Current at +3.3V

♦ Programmable Bias Current from 1mA to 100mA

♦ Programmable Modulation Current from

5mA to 60mA

♦ Bias Current and Modulation Current Monitors

♦ 87ps Rise/Fall Time

♦ Automatic Average Power Control with Failure

Monitor

♦ Complies with ANSI, ITU, and Bellcore

SDH/SONET Specifications

♦ Enable Control

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX3869EHJ

-40°C to +85°C 32 TQFP-EP*

MAX3869EHJ+

-40°C to +85°C 32 TQFP-EP*

MAX3869EGJ

-40°C to +85°C 32 QFN**

MAX3869E/D

-40°C to +85°C Dice***

*Exposed pad.

**Package Code: G3255-1

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

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

+Denotes lead-free package.

Typical Application Circuit

+3.3V

25Ω

MAX3869

OUT-

OUT+

BIAS

MD

FERRITE

BEAD

0.01µF

LD

23Ω

0.056µF

BIASMON

MODMON

1000pF

+3.3V

________________________________________________________________ Maxim Integrated Products 1

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.

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