MAX3738 Maxim Integrated Products, MAX3738 Datasheet

MAX3738

Manufacturer Part Number

MAX3738

Description

155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX3738.pdf (16 pages)

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The MAX3738 is a +3.3V laser driver designed for mul-

tirate transceiver modules with data rates from

155Mbps to 4.25Gbps. Lasers can be DC-coupled to

the MAX3738 for reduced component count and ease

of multirate operation.

Laser extinction ratio control (ERC) combines the features

of automatic power control (APC), modulation compensa-

tion, and built-in thermal compensation. The APC loop

maintains constant average optical power. Modulation

compensation increases the modulation current in pro-

portion to the bias current. These control loops, com-

bined with thermal compensation, maintain a constant

optical extinction ratio over temperature and lifetime.

The MAX3738 accepts differential data input signals.

The wide 5mA to 60mA (up to 85mA AC-coupled) mod-

ulation current range and up to 100mA bias current

range, make the MAX3738 ideal for driving FP/DFB

lasers in fiber optic modules. External resistors set the

required laser current levels. The MAX3738 provides

transmit disable control (TX_DISABLE), single-point

fault tolerance, bias-current monitoring, and photocur-

rent monitoring. The device also offers a latched failure

output (TX_FAULT) to indicate faults, such as when the

APC loop is no longer able to maintain the average

optical power at the required level. The MAX3738 is

compliant with the SFF-8472 transmitter diagnostic and

SFP MSA timing requirements.

The MAX3738 is offered in a 4mm x 4mm, 24-pin thin

QFN package and operates over the extended -40°C to

+85°C temperature range.

19-3162; Rev 2; 12/08

Typical Application Circuit appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Multirate OC-3 to OC-48 FEC Transceivers

Gigabit Ethernet SFF/SFP and GBIC

Transceivers

1Gbps/2Gbps/4Gbps Fibre Channel SFF/SFP

and GBIC Transceivers

155Mbps to 4.25Gbps SFF/SFP Laser Driver

________________________________________________________________ Maxim Integrated Products

General Description

Applications

with Extinction Ratio Control

♦ Single +3.3V Power Supply

♦ 47mA Power-Supply Current

♦ 85mA Modulation Current

♦ 100mA Bias Current

♦ Automatic Power Control (APC)

♦ Modulation Compensation

♦ On-Chip Temperature Compensation

♦ Self-Biased Inputs for AC-Coupling

♦ Ground-Referenced Current Monitors

♦ Laser Shutdown and Alarm Outputs

♦ Enable Control and Laser Safety Feature

+ Denotes a lead(Pb)-free/RoHS-compliant package.

* EP = Exposed pad.

MAX3738ETG

MAX3738ETG+

PART

TOP VIEW

MODTCOMP

TX_DISABLE

*THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY

GROUND ON THE CIRCUIT BOARD.

PIN1 INDICATED BY + ON LEAD-FREE PACKAGE.

IN+

IN-

*EP

TEMP RANGE

-40°C to 85°C

Ordering Information

MAX3738

Pin Configuration

www.DataSheet4U.com

PIN-PACKAGE

24 Thin QFN-EP*

OUT+

OUT-

BIAS

Features

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