MAX3668 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX3668

+3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control

Maxim Integrated 

19-4799; Rev 4; 2/05

+3.3V, 622Mbps SDH/SONET

Laser Driver with Automatic Power Control

General Description

The MAX3668 is a complete, +3.3V laser driver with

automatic power control (APC) circuitry for SDH/SONET

applications up to 622Mbps. It accepts differential

PECL inputs, provides bias and modulation currents,

and operates over a temperature range of -40°C to

+85°C.

An APC feedback loop is incorporated to maintain a

constant average optical power over temperature and

lifetime. The wide modulation current range of 5mA to

75mA and bias current of 1mA to 80mA are easy to

program, making this product ideal for use in various

SDH/SONET applications.

The MAX3668 also provides enable control and a failure-

monitor output to indicate when the APC loop is unable

to maintain the average optical power. The MAX3668 is

available in a 5mm 32-pin TQFP package as well as in

dice.

Applications

622Mbps SDH/SONET Access Nodes

Laser Driver Transmitters

Section Regenerators

Features

♦ Single +3.3V or +5.0V Operation

♦ 38mA Supply Current at +3.3V

♦ Programmable Modulation Current from

5mA to 75mA

♦ Programmable Bias Current from 1mA to 80mA

♦ Rise/Fall Time <200ps

♦ Automatic Average Power Control with Failure

Monitor

♦ Complies with ANSI, ITU, and Bellcore

SONET/SDH Specifications

♦ Enable Control

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX3668EHJ

-40°C to +85°C 32 TQFP (5mm x 5mm)

MAX3668EHJ+ -40°C to +85°C 32 TQFP (5mm x 5mm)

MAX3668E/D

Note

Dice*

Note: Dice are designed to operate over a -40°C to +140°C

junction temperature (Tj) range, but are tested and guaranteed

at TA = +25°C.

*Contact factory for availability.

+Denotes lead-free package.

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

+3.3V

130Ω

MAX3693

4:1

SERIALIZER

WITH

CLOCK GEN

PECL

82Ω

130Ω

DATA+

DATA-

82Ω

MAX3668

+3.3V

VCC

OUT-

OUT+

BIAS

MD

0.1µF

LASER

R-

6.3Ω R+

20Ω

RD

5Ω

CD

1.0µF

RFILT

20Ω

CFILT

5pF

FERRITE

BEAD

CMD

1000pF

†C0

________________________________________________________________ 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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