________________General Description

The MAX3667 is a complete, +3.3V laser driver with

automatic power control (APC), designed for SDH/

SONET applications up to 622Mbps. It accepts differ-

ential PECL inputs, provides single-ended bias and

modulation currents, and operates over a -40°C to

+85°C temperature range.

A temperature-stabilized reference voltage simplifies

laser current programming. It allows external program-

ming of the modulation current between 5mAp-p and

60mAp-p, and of the bias current between 5mA and

90mA.

The APC function, which incorporates a monitor photo-

diode, an external resistor, and two external capacitors,

maintains constant laser output power. Two current

monitors provide high-speed signals that are directly

proportional to the bias and modulation currents.

Additional features include disable/enable control and

a slow-start feature with a minimum turn-on time of

50ns. The MAX3667 is available in die form and in a

32-pin TQFP package.

________________________Applications

622Mbps SDH/SONET Access Nodes

Laser Driver Transmitters

Section Repeaters

____________________________Features

o Single +3.3V or +5.0V Operation

o Automatic Average Power Control

o Bias Current and Modulation Current Monitor

Outputs

o TTL-Compatible Disable Input

o Temperature-Compensated Reference

o PECL-Compatible Data Inputs

+3.3V, 622Mbps SDH/SONET Laser Driver

with Automatic Power Control

________________________________________________________________

Maxim Integrated Products

1

MAX3667

MAX3691

130

Ω

130

Ω

50

Ω

82

Ω

82

Ω

PECL

1

µF

DISABLE

COMP

BIASMON

MODMON

APCSET

MD

MONITOR

DIODE

+3.3V

LASER

DIODE

IMOD

22

Ω

4.7

Ω

100

Ω

470nH

4:1

SERIALIZER

WITH

CLOCK GEN

1

µF

0.01

µF

0.1

µF

0.1

µF

IBIAS

MODSET

GND

IN+

IN-

BIASSET

APC

1nF

+3.3V

____________________________________________________Typical Operating Circuit

19-1311; Rev 1; 3/98

PART

MAX3667ECJ

MAX3667E/D

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

32 TQFP

Dice*

EVALUATION

KIT

AVAILABLE

_______________Ordering Information

Pin Configuration appears at end of data sheet.

*

Dice are designed to operate from -40°C to +85°C but are

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

For small orders, phone 408-737-7600 ext. 3468.