Typical Application Circuit

General Description

The MAX3747/MAX3747A/MAX3747B multirate limiting

amplifiers function as data quantizers for OC-3 through

OC-48 synchronous optical network (SONET), Fibre-

Channel, and Gigabit Ethernet optical receivers. They are

pin-for-pin compatible with the SY88993V from Micrel

Semiconductor, Inc. The amplifiers accept a wide range of

input voltages and provide constant-level, current-mode

logic (CML) output voltages with controlled edge speeds.

The MAX3747B has enhanced LOS operation under over-

load conditions.

The MAX3747/MAX3747A/MAX3747B limiting amplifiers

feature a programmable loss-of-signal detect (LOS)

and an optional disable function (DISABLE) that can be

combined to implement squelch.

The MAX3747/MAX3747A/MAX3747B are available in a

3mm, 10-pin µMAX® package ideal for small form-

factor receivers.

Applications

Gigabit Ethernet SFP/SFF Optical Transceiver Modules

1G/2G Fibre-Channel SFP/SFF Optical Transceiver

Modules

Multirate OC-3 to OC-48 FEC SFP/SFF Optical

Transceiver Modules

10G LX4 Transceiver Modules

Features

♦ Pin Compatible with Micrel SY88993V

♦ 155Mbps to 3.2Gbps Operation

♦ > 57dB of Gain

♦ 18mA Supply Current

♦ Chatter-Free LOS with Programmable Threshold

♦ Output DISABLE Function

♦ PECL-Compatible Inputs

155Mbps to 3.2Gbps, Low-Power SFP

Limiting Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

MAX3745

SUPPLY FILTER

MAX4004

DS1859

3-INPUT

DIAGNOSTIC

MONITOR

SFP OPTICAL RECEIVER

5-PIN TO-HEADER

HOST BOARD

HOST FILTER

SERDES

50

Ω

50

Ω

MAX3747

MAX3747A

MAX3747B

TH

GND LOS

DISABLE

IN-

IN+

OUT-

OUT+

0.1

μF

0.1

μF

0.1

μF

0.1

μF

0.1

μF

0.1

μF

50

Ω

50

Ω

≥ 5kΩ

LOS

4.7k

Ω TO 10kΩ

19-3297; Rev 1; 10/07

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX3747EUB

-40°C to +85°C

10 µMAX

U10C-4

MAX3747AEUB

-40°C to +85°C

10 µMAX

U10C-4

MAX3747BEUB

-40°C to +85°C

10 µMAX

U10C-4

Pin Configuration appears at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.