HFBR-0537 datasheet, PDF - EEWORLD Datasheet

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HFBR-0537: DescriptionKIT EVAL FIBER OPTIC 32MBD; CategoryDevelopment board/suite/development tools; File Size185KB，12 Pages; ManufacturerBroadcom; Environmental Compliance

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HFBR-0537 Overview

KIT EVAL FIBER OPTIC 32MBD

HFBR-0537 Parametric

Parameter Name	Attribute value
type	interface
Function	optical fiber
Embedded	no
IC/parts used	HFBR-1527，HFBR-2526
Main attributes	DC ~ 32MBd TTL
What's included	board, cable
Auxiliary properties	TTL compatible

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Inexpensive dc to 32 MBd Fiberoptic Solutions for

Industrial, Medical,Telecom, and Proprietary data

communication Applications

Application Note 1121

Introduction

Low-cost fiberoptic data-communication links have

been used to replace copper wire in numerous industrial,

medical, and proprietary applications. The fiberoptic

transmitter and receiver circuits in this publication ad-

dress a wide range of applications. These recommended

circuits are compatible with unencoded or burst-mode

communication protocols originally developed for use

with copper wire. Complete TTL compatible digital

transceiver solutions, including the schematic, printed

circuit artwork, and material lists, are presented in this

application note, so that users of this low-cost fiberoptic

technology do not need to do any analog design.

Designers are encouraged to embed these complete

fiberoptic solutions into their products and various

methods for electronically downloading the reference

designs are described.

The second reason is that when using plastic optical

fiber (POF), or hard clad silica (HCS) fiber, the total cost

of the data communication link is roughly the same as

when using copper wires.

Wire Communication Protocols and Optical Data Links

Many existing serial wire communication protocols

were developed for differential line receivers or opto-

couplers that can sense the DC component of the data

communication signal. This type of serial data is often

called arbitrary duty factor data because it can remain

in the logic “1” or logic “0” state for indefinite periods of

time. Arbitrary duty factor data has an average value,

which can instantaneously be anywhere between 0 per-

cent and 100 percent of the binary signal’s amplitude,

or in other words, arbitrary duty factor data contains

DC components. Communication protocols that were

developed specifically for use with copper wire often

require an optical receiver that is DC coupled or capable

of detecting if the data is changing from a high-to-low

or low-to-high logic state. That is, the receiver needs

to be an edge detector. At relatively modest data rates

between zero and 10-Mbits/sec it is possible to con-

struct DC coupled TTL-compatible fiberoptic receivers.

The Avago Technologies HFBR-2521Z is a TTL-compat-

ible, DC to 5-Mbit/sec receiver, and the HFBR-2528Z is

a DC to 10-Mbit/sec CMOS or TTL-compatible receiver.

Additional information about DC to 5-Mbit/ sec applica-

tions can be found in Avago Technologies AN-1035, and

applications support for DC to 10-Mbit/sec applications

can be obtained by reading AN-1080. This application

note will focus on higher speed or higher performance

arbitrary duty factor optical data communication links

that work at higher data rates or greater distances than

achievable with the HFBR-2521Z or HFBR- 2528Z com-

ponents. The optical transceivers shown in this applica-

tion note can also be used in burst-mode applications

where the data is transmitted in packets and there are

no transitions between bursts of date.

Why Use Optical Fibers?

Copper wire is an established technology that has been

successfully used to transmit data in a wide range of

industrial, medical and proprietary applications, but

copper can be difficult or impossible to be used in nu-

merous situations. By using differential line receivers,

optocouplers, or transformers conventional copper

wire cables can be used to transmit data in applica-

tions where the reference or ground potentials of two

systems are different, but during and after the initial

installation great care must still be taken not to corrupt

the data with noise induced into the cable’s metallic

shields by adjacent power lines or differences in ground

potential. Unlike copper wires, optical fibers do not

require rigorous grounding rules to avoid ground loop

interference, and fiberoptic cables do not need termi-

nation resistors to avoid reflections. Optical transceivers

and cables can be designed into systems so that they

survive lightning strikes that would normally damage

metallic conductors or wire input/output (I/O) cards;

in essence, fiberoptic data links are used in electrically

noisy environments where copper wire fails. In addition

to all of these inherent advantages there are two other

reasons why optical fibers are beginning to replace

copper wires. The first reason is that training and simple

tools are now available.

HFBR-0537 Related Products

	HFBR-0537	HFBR-0536	HFBR-0536Z
Description	KIT EVAL FIBER OPTIC 32MBD	KIT EVAL FIBER OPTIC 32MBD	KIT EVAL FIBER OPTICS 32MBD
type	interface	interface	interface
Function	optical fiber	optical fiber	optical fiber
Embedded	no	no	no
IC/parts used	HFBR-1527，HFBR-2526	HFBR-1527，HFBR-2526	HFBR-1527Z，HFBR-2526Z
Main attributes	DC ~ 32MBd TTL	DC ~ 32MBd TTL	650nm，32MBd，TTL
What's included	board, cable	board, cable	board, cable
Auxiliary properties	TTL compatible	TTL compatible	-

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