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PDF HFCT-5912E Data sheet ( Hoja de datos )
| Número de pieza | HFCT-5912E | |
| Descripción | Small Form Factor MT-RJ Fiber Optic Transceivers | |
| Fabricantes | Hewlett-Packard | |
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Small Form Factor MT-RJ
Fiber Optic Transceivers
for Gigabit Ethernet
Technical Data
HFBR-5912E,
850 nm VCSEL
HFCT-5912E,
1300 nm FP Laser
Features
• Compliant with
Specifications for
IEEE 802.3z/ Gigabit
Ethernet
• Multisourced 2 x 5 Package
Style with Integral MT-RJ
Connector
• Performance
HFBR-5912E (1000 Base-SX)
– 220 m Links in 62.5/125
µm MMF 160 MHz*km
Cables
– 275 m Links in 62.5/125
µm MMF 200 MHz*km
Cables
– 500 m Links in 50/125 µm
MMF 400 MHz*km Cables
– 550 m Links in 50/125 µm
MMF 500 MHz*km Cables
HFCT-5912E (1000 Base-LX)
– 550 m Links in 62.5/125
µm MMF Cables
– 10 km Links in 8/125 µm
SMF Cables
• IEC 60825-1 Class 1/CDRH
Class 1 Laser Eye Safe
• Single +3.3 V Power Supply
Operation with PECL Logic
I/O Interfaces, TTL Signal
Detect and Transmit Disable
• Wave Solder and Aqueous
Wash Process Compatible
Applications
• Switch to Switch Interface
• Switched Backbone
Applications
• High Speed Interface for
File Servers
• High Performance Desktops
Related Products
• Physical Layer ICs Available
for Optical or Copper
Interface (HDMP-1636A/
1646A)
• Quad SERDES IC Available
for High Density Interfaces
(HDMP-1680)
• 1x9 Fiber Optic Transceivers
for Gigabit Ethernet
(HFBR/HFCT-53D5)
• Gigabit Interface Converters
(GBIC) for Gigabit Ethernet
SX – HFBR-5601
LX – HFCT-5611
Description
The HFBR/HFCT-5912E
transceiver from Agilent allows
the system designer to implement
a range of solutions for multimode
and single mode Gigabit Ethernet
applications.
The transceivers are configured
in the new multisourced industry
standard 2 x 5 dual-in-line package
with an integral MT-RJ fiber
connector.
Transmitter Section
The transmitter section of the
HFBR-5912E consists of an
850 nm Vertical Cavity Surface
Emitting Laser (VCSEL) in an
optical subassembly (OSA),
which mates to the fiber cable.
The HFCT-5912E incorporates a
1300 nm Fabry-Perot (FP) Laser
designed to meet the Gigabit
Ethernet LX specification. The
OSA is driven by a custom silicon
bipolar IC which accepts
differential PECL logic signals
(ECL referenced to a +3.3 V
supply) and provides bias and
modulation control for the laser.
Receiver Section
The receiver of the HFBR-5912E
includes a GaAs PIN photodiode
mounted together with a custom,
silicon bipolar transimpedance
preamplifier IC in an OSA. This
OSA is mated to a custom silicon
bipolar circuit that provides post-
amplification and quantization.
The HFCT-5912E utilizes an InP
PIN photodiode in a similar
configuration.
The post-amplifier also includes
a Signal Detect circuit which
provides a TTL logic-high output
upon detection of an optical signal.
1 page  
5
Eye Safety Circuit
For an optical transmitter device
to be eye-safe in the event of a
single fault failure, the transmit-
ter must either maintain eye-safe
operation or be disabled.
In the HFBR-5912E there are
three key elements to the laser
driver safety circuitry: a monitor
diode, a window detector circuit,
and direct control of the laser
bias. The window detection
circuit monitors the average
optical power using the monitor
diode. If a fault occurs such that
the transmitter dc regulation
circuit cannot maintain the
preset bias conditions for the
laser emitter within ± 20%, the
transmitter will automatically be
disabled. Once this has occurred,
an electrical power reset or
toggling the transmit disable will
allow an attempted turn-on of the
transmitter. If fault remains the
transmitter will stay disabled.
The HFCT-5912E utilizes an
optical subassembly consisting of
a short piece of single mode fiber
along with a current limiting
circuit to guarantee eye-safety. It
is intrinsically eye safe and does
not require shut down circuitry.
Signal Detect
The Signal Detect circuit provides
a TTL low output signal when the
optical link is broken or when the
transmitter is OFF as defined by
the Gigabit Ethernet specification
IEEE 802.3z, Table 38.1. The
Signal Detect threshold is set to
transition from a high to low
state between the minimum
receiver input optional power and
-30 dBm avg. input optical power
indicating a definite optical fault
(e.g. unplugged connector for the
receiver or transmitter, broken
fiber, or failed far-end transmitter
or data source). A Signal Detect
indicating a working link is
functional when receiving
encoded 8B/10B characters. The
Signal Detect does not detect
receiver data error or error-rate.
Data errors can be determined by
signal processing offered by
upstream PHY ICs.
Electromagnetic
Interference (EMI)
One of a circuit board designer’s
foremost concerns is the control
of electromagnetic emissions
from electronic equipment.
Success in controlling generated
Electromagnetic Interference
(EMI) enables the designer to
pass a governmental agency’s
EMI regulatory standard and
more importantly, it reduces the
possibility of interference to
neighboring equipment. Agilent
has designed the HFBR/HFCT-
5912E to provide excellent EMI
performance. The EMI
performance of a chassis is
dependent on physical design and
features which help improve EMI
suppression. Agilent encourages
using standard RF suppression
practices and avoiding poorly
EMI-sealed enclosures.
Radiated Emissions for the
HFBR-5912E and HFCT-5912E
have been tested successfully in
several environments. While this
number is important for system
designers in terms of emissions
levels inside a system, Agilent
recognizes that the performance
of most interest to our customers
is the emissions levels, which
could be expected to radiate to
the outside world from inside a
typical system. In their
application, SFF transceivers are
intended for use inside an
enclosed system, protruding
through the specified panel
opening at the specified
protrusion depth.
Along with the system advantage
of high port density comes the
increase in the number of
apertures. Careful attention must
be paid to the locations of high-
speed clocks or gigabit circuitry
with respect to these apertures.
While experimental measurements
and experiences do not indicate
any specific transceiver emissions
issues, Agilent recognizes that
the transceiver aperture is often a
weak link in system enclosure
integrity and has designed the
modules to minimize emissions
and if necessary, contain the
internal system emissions by
shielding the aperture.
To that end, Agilent’s gigabit
MT-RJ transceivers (HFCT-5912E
and HFBR-5912E) have nose
shields which provide a
convenient chassis connection to
the nose of the transceiver. This
nose shield improves system EMI
performance by closing off the
MT-RJ aperture. Localized
shielding is also improved by
tying the four metal housing
package grounding tabs to signal
ground on the PCB. Though not
obvious by inspection, the nose
shield and metal housing are
electrically separated for
customers who do not wish to
directly tie chassis and signal
grounds together. The
recommended transceiver
position, PCB layout and panel
opening for both HFBR-5912E
and HFCT-5912E are the same,
making them mechanically drop-
in compatible. Figure 6 shows
the recommended positioning of
the transceivers with respect to
the PCB and faceplate.
5 Page 
11
RX TX
Mounting Studs/
Solder Posts
Package
Grounding Tabs
Top
View
RECEIVER SIGNAL GROUND f 1 10 f TRANSMITTER DATA IN BAR
RECEIVER POWER SUPPLY f 2
9 f TRANSMITTER DATA IN
SIGNAL DETECT
f3
8 f TRANSMITTER DISABLE
RECEIVER DATA OUT BAR f 4
7 f TRANSMITTER SIGNAL GROUND
RECEIVER DATA OUT
f5
6 f TRANSMITTER POWER SUPPLY
Figure 2. Pin Out
Table 1. Pin Out Table
Pin Symbol
Two Mounting
Studs
Four Package
Grounding Tabs
1 VEER 1
2 VCCR
3 SD
4 RD-
5 RD+
6 VCCT
7 VEET 1
8 TDis
9 TD+
10 TD-
Functional Description
The mounting studs are provided for transceiver mechanical attachment to the circuit
board, they may also provide an optional connection of the transceiver to the
equipment chassis ground.
Note :- The holes in the circuit board must be tied to chassis ground.
Connect to signal ground.
Receiver Signal Ground
Directly connect this pin to receiver signal ground plane.
Receiver Power Supply
Signal Detect
Normal operation: Logic “1” Output
Fault Condition: Logic “0” Output
Received Data Out Bar
No internal terminations provided.
Received Data Out
No internal terminations provided.
Transmitter Power Supply
Transmitter Signal Ground
Transmitter Disable:
Normal Operation: Logic "0" - Laser On or Open Circuit
Transmit Disabled: Logic "1" - Laser Off
Transmitter Data In
An internal 50R termination consisting of 100R across TD+ and TD- will be provided
Transmitter Data In Bar
(See TD+ pin for terminaton details)
Note:
1. The Transmitter and Receiver VEE connections are commoned within the module.
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet HFCT-5912E.PDF ] | |
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