HFBR-0536 Avago Technologies US Inc., HFBR-0536 Datasheet

KIT EVAL FIBER OPTIC 32MBD

HFBR-0536

Manufacturer Part Number
HFBR-0536
Description
KIT EVAL FIBER OPTIC 32MBD
Manufacturer
Avago Technologies US Inc.
Datasheets

Specifications of HFBR-0536

Main Purpose
Interface, Fiber Optics
Embedded
No
Utilized Ic / Part
HFBR-1527, HFBR-2526
Primary Attributes
DC ~ 32MBd TTL
Secondary Attributes
TTL-Compatible
Tool / Board Applications
Fiber Optic Transceivers
Mcu Supported Families
HFBR-1527
Development Tool Type
Hardware / Software - Eval/Demo Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
516-2145
HFBR-0536
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.
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.
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.

Related parts for HFBR-0536

HFBR-0536 Summary of contents

Page 1

... DC coupled TTL-compatible fiberoptic receivers. The Avago Technologies HFBR-2521Z is a TTL-compat- ible 5-Mbit/sec receiver, and the HFBR-2528Z 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 ...

Page 2

The Pros and Cons of Arbitrary Duty Factor or Burst Mode Data The most important advantage of any existing data communication protocol is that it already exists, and typically works reasonably well with copper wires in many applications. On the ...

Page 3

SERIAL DATA 0% TO 100% DUTY FACTOR (D.F.) SOURCE 32 M BITS/SEC MANCHESTER ENCODER (50% EFFICIENT) 4B5B ENCODER (80% EFFICIENT) 8B10B ENCODER (80% EFFICIENT )-1 SCRAMBLER (100% EFFICIENT) NOTE THAT THE MAXIMUM FUNDAMENTAL FREQUENCY OF ...

Page 4

... LED 650 nm HFBR-14X2Z HFBR-24X6Z 820 nm LED 820 nm HFBR-14X2Z HFBR-24X6Z 820 nm LED 820 nm HFBR-14X4Z HFBR-24X6Z 820 nm LED 820 nm HFBR-14X4Z HFBR-24X6Z 820 nm LED 820 nm HFBR-13X2TZ HFBR-23X6TZ 1300 nm LED 1300 nm HFBR-13X2TZ HFBR-23X6TZ 1300 nm LED 1300 nm 4 Distances and Data Rates Achievable The simple transceivers recommended in this applica- tion note can be used to address a very wide range of distances, data rates, and system cost targets ...

Page 5

... Figure 4. Equation 1 allows the designer to quickly determine the values of C6 and C7 so that the receiver is optimized for operation at any data rate maximum of 32 MBd U2A 3 HFBR-15X7Z U2B 7 HFBR-14X4Z HFBR-13X2TZ 1300 nm LED 62.5/125 ∞ 150 pF ...

Page 6

... Figure 3 and the receiver shown in Figure 5, download file from the following URL: http://www.avagotech.com Equation HFBR-24X6Z – 820 nm 200 mm HCS 62.5/125 NOISY HOST SYSTEM POWER + C12 10 mF R10 240 8 C13 0.1 mF R11 240 2 (3) (R6 + R7) [ Data Rate (Bd) ] HFBR-23X6TZ – 1300 nm 62.5/125 mm TTL OUT (-) TTL OUT (+) ...

Page 7

...

Page 8

Figure 6a. Top Overlay Figure 6d. Mid Layer TX FIGURE 3 N_GND N_V CC TTL_IN Rx GND RX FIGURE 4 Rx GND N_GND N_V cc TTL_OUT+ TTL_OUTÐ Figure 6g. Transmitter 1 Schematic Figure 6. Printed circuit Artwork for Transmitter shown ...

Page 9

Figure 7a. Top Overlay Figure 7d. Mid layer 3 TX FIGURE 3 TX N_GND N_V CC TTL_IN Rx GND RX FIGURE GND N_GND N_V cc TTL_OUT+ TTL_OUTÐ Figure 7g. Transmitter 2 Schematic Figure 7. Printed circuit Artwork ...

Page 10

Error Rates and Noise Immunity The probability that a fiberoptic link will make an error is related to the receiver’s own internal random noise and its ability to reject noise originating from the sys- tem in which it is installed. ...

Page 11

... Footprint Material Part Number 805 X75 or C0805X7R500104KNE better 805 NPO/COG 805 NPO/COG B Tantalum, TA010TCM106MBN 10V 805 NPO/COG S014 74ACTQ00 See Table 2 HFBR-1XXXZ See Table 4 HFBR-2XXXZ LT1016CS8 1812 HF30ACB453215 10% 1008LS-122XKBC 805 5% CR080510W4R7JT 805 1% 805 1% 805 1% 805 5% CR080510W271JT 805 5% CR080510W241JT 805 5% ...

Page 12

... AV02-0723EN - July 22, 2010 Footprint Material Part Number 805 X7R or C0805X7R500104KNE Better 805 NPO/COG 805 NPO/COG B Tantalum, TA010TCM106MBN 10 V 805 NPO/COG S014 74ACTQ00 See Table 2 HFBR-1XXXZ See Table 4 HFBR-2XXXZ S08 LT1016CS8 S016 MMPQ3904 1812 HF30ACB453215 10% 108LS-122XKBC 805 5% CR080510W4R7JT 805 1% 805 1% 805 1% 805 5% CR080510W242JT 805 5% ...

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