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PDF HFBR-2412TZ Data sheet ( Hoja de datos )
| Número de pieza | HFBR-2412TZ | |
| Descripción | 820 nm Miniature Link Fiber Optic Components | |
| Fabricantes | Avago | |
| Logotipo |  |
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HFBR-14xxZ and HFBR-24xxZ Series
Low-Cost, 820 nm Miniature Link Fiber Optic Components
with ST®, SMA, SC and FC Ports
Data Sheet
Description
The 820 nm Miniature Link Series of components is
designed to provide cost-effective, high performance
fiber optic communication links for information systems
and industrial applications with link distances of several
kilometers. With the HFBR-24x6Z, the 125 MHz analog
receiver, data rates of up to 160 MBd can be attained.
Transmitters and receivers are directly compatible with
popular “industry-standard” connectors: ST®, SMA, SC
and FC. They are completely specified with multiple fiber
sizes; including 50/125 µm, 62.5/125 µm, 100/140 µm,
and 200 µm.
Products are available in various options. For example,
transmitters with the improved protection option “P”
show an increased ESD resistance to the pins. This
“HFBR-141xPxZ” integrated solution is realized by includ-
ing a Zener diode parallel to the LED.
The HFBR-14x4Z high power transmitter and HFBR-24x6Z
125 MHz receiver pair up to provide a duplex solution
optimized for 100 Base-SX. 100Base-SX is a Fast Ethernet
Standard (100 Mbps) at 850 nm on multimode fiber.
Evaluation kits are available for ST products, including
transmitter, receiver, eval board and technical literature.
Features
• RoHS compliant
• Meets IEEE 802.3 Ethernet and 802.5 token ring stan-
dards
• Meets TIA/EIA-785 100Base-SX standard
• Low-cost transmitters and receivers
• Choice of ST®, SMA, SC or FC ports
• 820 nm wavelength technology
• Signal rates up to 160 MBd
• Link distances up to several kilometers
• Compatible with 50/125 µm, 62.5/125 µm, 100/140
µm, and 200 µm Plastic-Clad Silica (PCS) Fiber
• Repeatable ST connections within 0.2 dB typical
• Unique optical port design for efficient coupling
• Pick and place, and wave solderable
• No board mounting hardware required
• Wide operating temperature range -40 °C to +85 °C
• Conductive port option
Applications
• 100Base-SX Fast Ethernet on 850 nm
• Media/fiber conversion, switches, routers, hubs and
NICs on 100Base-SX
• Local area networks
• Computer-to-peripheral links
• Computer monitor links
• Digital cross connect links
• Central office switch/PBX links
• Video links
• Modems and multiplexers
• Suitable for Tempest systems
• Industrial control links
ST® is a registered trademark of AT&T.
1 page  
Package and Handling Information
Package Information
All transmitters and receivers of the 820 nm Miniature
Link Series are housed in a low-cost, dual-inline package
that is made of high strength, heat resistant, chemically
resistant, and UL 94V-O flame retardant plastic (UL File
#E121562). The transmitters are easily identified by the
light grey color connector port. The receivers are easily
identified by the dark grey color connector port. (Black
color for conductive port). The package is designed for
pick and place and wave soldering so it is ideal for high
volume production applications.
Handling and Design Information
Each part comes with a protective port cap or plug cov-
ering the optics. Note: This plastic or rubber port cap is
made to protect the optical path during assembly. It is
not meant to remain on the part for a long period. These
caps/plugs will vary by port style. When soldering, it is
advisable to leave the protective cap on the unit to keep
the optics clean. Good system performance requires
clean port optics and cable ferrules to avoid obstructing
the optical path.
Clean compressed air often is sufficient to remove par-
ticles of dirt; methanol on a cotton swab also works well.
Recommended Chemicals for Cleaning/Degreasing
820 nm Miniature Link Products
Alcohols: methyl, isopropyl, isobutyl.
Aliphatics: hexane, heptane, Other: soap solution, naph-
tha.
Do not use partially halogenated hydrocarbons (such as
1.1.1 trichloroethane), ketones (such as MEK), acetone,
chloroform, ethyl acetate, methylene dichloride, phe-
nol, methylene chloride, or N-methylpyrolldone. Also,
Avago does not recommend the use of cleaners that use
halogenated hydrocarbons because of their potential
environmental harm.
5
5 Page 
5 MBd Logic Link Design
The resistor R1 is the only significant element in the drive
circuit (see Figure 2) that limits the current through the
LED, apart from the gate´s output port. Depending
on the actual gate used, the voltage drop on the output
port Vport could be neglected. The forward voltage val-
ue, VF, of the LED depends on the desired LED current
and on the temperature (see Figure 9). Make sure you
take this behavior into account for the calculations.
The curves in Figure 3, Figure 4, and Figure 5 are con-
structed assuming no inline splice or any additional
system loss. Besides fiber attenuation, for correct power
budget calculation, make sure you take into account the
effect of bending, humidity, ambient temperature, aging
and other relevant influences. All these additional losses
reduce the achievable link distance accordingly.
For calculating the LED´s aging effect, an additional loss
of about 1.5 dB is recognized.
The following example will illustrate the technique for
selecting the appropriate value of IF and R1:
R1
=
VCC
I
-
F
VF
Maximum distance required = 2000 meters by using
HFBR-14x4Z/24x2Z logic link with 62.5/125 µm fiber.
Figure 4 shows the “worst-case” drive current of about 43
mA for reaching a distance of about 2000 meters.
Figure 9 shows the transmitter forward voltage of about
VF = 1.62 V. If the typical circuit configuration (Figure 2)
is used at Vcc = 5.0 V, the resistor value “R1” should be
choosen to 78.6 Ω (3.38 V/43 mA) for reaching driver
current of about 43 mA.
Page 16 shows the guaranteed HFBR-14x4Z´s optical
output power limit of -16.0 dBm (for driver current of 60
mA) over the entire temperature range.
Figure 10 shows the normalized typical output power.
When the transmitter will be driven with 43 mA the opti-
cal output power is about 0.70 or -1.55 dB lower than at
60 mA.
With an assumed fiber attenuation of 3.2 dB/km and the
reduced driver current of 43 mA, the minimum optical
output power at fiber end is about -24 dBm, which is
equal to the receiver sensitivity over the entire tempera-
ture range.
For balancing the individual additional system losses, the
driver current must be increased accordingly.
+5 V SELECT R1 TO SET IF
R1 IF 2
6
1K
7
3
HFBR-14xxZ
TRANSMITTER
T
DATA IN
½ 75451
TRANSMISSION
DISTANCE =
HFBR-24x2Z
RECEIVER
2
R6
7&3
TTL DATA OUT
RL VCC
0.1 µF
Note:
A bypass capacitor (0.01 µF to 0.1 µF ceramic) must be connected from pin 2 to pin 7 of the receiver. Total lead length between both ends of
the capacitor and the pins should not exceed 20 mm.
Figure 2. Typical Circuit Configuration
The following diagrams (Figure 3 to Figure 5) serve as an
aid in Link Design and are based on theoretical calcula-
tions. For broad use, no additional effects such as aging
were taken into account. The additional losses and the
individual safety buffer values should be added sepa-
rately. These diagrams reflect the pure viewing of power
budget and do not allows conclusions about the actual
link quality.
Overdrive: Maximum optical output power of Tx com-
bined with receiver sensitivity of -10 dBm over the entire
temperature range.
Typical 25 °C: Typical optical output power of Tx com-
bined with receiver sensitivity of -25.4 dBm at TA = 25 °C.
Worst Case: Minimum optical output power of Tx com-
bined with receiver sensitivity of -24 dBm over the entire
temperature range.
11
11 Page | ||
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| PDF Descargar | [ Datasheet HFBR-2412TZ.PDF ] | |
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