MAX3646_11 datasheet, PDF - EEWORLD Datasheet

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MAX3646_11: Description155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control; File Size289KB，15 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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MAX3646_11 Overview

155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control

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19-3161; Rev 2; 6/11

KIT

ATION

EVALU

BLE

AVAILA

155Mbps to 622Mbps SFF/SFP

Laser Driver with Extinction Ratio Control

General Description

Features

♦

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

MAX3646

The MAX3646 is a +3.3V laser driver designed for mul-

tirate transceiver modules with data rates from

155Mbps to 622Mbps. Lasers can be DC-coupled to

the MAX3646 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 MAX3646 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 MAX3646 ideal for driving FP/DFB

lasers in fiber optic modules. External resistors set the

required laser current levels. The MAX3646 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 MAX3646 is

compliant with the SFF-8472 transmitter diagnostic and

SFP MSA timing requirements.

The MAX3646 is offered in a 4mm x 4mm, 24-pin thin

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

+85°C temperature range.

Ordering Information

PART

MAX3646ETG

MAX3646ETG-T

MAX3646ETG+

MAX3646ETG+T

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

24 Thin QFN-EP*

+Denotes

a lead-free/RoHS-compliant package.

*EP

= Exposed pad.

T = Tape and reel.

Pin Configuration

TH_TEMP

APCFILT2

APCFILT1

18 MD

17 V

16 OUT+

15 OUT-

14 V

*EP

PC_MON

BC_MON

SHUTDOWN

GND

TX_FAULT

GND

13 BIAS

MODSET

APCSET

TOP VIEW

MODBCOMP

Applications

Multirate OC-3 to OC-12 FEC Transceivers

125Mbps Ethernet SFP, GBIC, and 1 x 9

Transceivers

MODTCOMP 1

IN+ 3

IN- 4

MAX3646

Typical Application Circuit appears at end of data sheet.

TX_DISABLE 6

*THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY

GROUND ON THE CIRCUIT BOARD.

________________________________________________________________

Maxim Integrated Products

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.

MAX3646_11 Related Products

	MAX3646_11	MAX3646ETGT
Description	155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control	155Mbps to 622Mbps SFF/SFP Laser Driver with Extinction Ratio Control

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