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Электронный компонент: HFCT-5908E

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Agilent HFBR-5908E/HFCT-5908E
ATM Fiber Optic Transceivers for
SONET OC-12/SDH STM-4
Data Sheet
Description
The HFBR/HFCT-5908E
transceivers from Agilent allow
the system designer to implement
a range of solutions for multimode
and single mode SONET OC-12/
(SDH STM-4) applications.
These transceivers are supplied in
the new industry standard 2 x 5
DIP style package with an MT-RJ
fiber connector interface.
ATM 500 m Backbone Links
The HFBR-5908E is a 1300 nm
product with optical performance
compliant with the SONET STS-12c
(OC-12) Physical Layer Interface
specification. This physical layer
is defined in the ATM forum User
Network Interface (UNI)
specification version 3.0. This
document references the ANSI
T1E1.2 specification for the
details of the interface for 500 m
multimode fiber backbone links.
SONET OC-12/SDH STM-4/ATM
15 km Links
The HFCT-5908E transceiver is a
high performance, cost effective
module for serial optical
communications applications
specified for a signal rate of
622 MBd. It is designed to provide
a SONET/SDH compliant link for
622 Mb/s intermediate reach links.
Features
Compliant with ATM forum
622.08 Mb/s physical layer
specification (AF-PHY-0046.000)
Compliant with ANSI Broadband
ISDN - physical layer
specification T1.646-1995 and
T1.646a-1997
HFBR-5908E is compliant with
specifications proposed to ANSI
T1E1.2 committee for inclusion in
SONET physical layer
specifications (T1E1/T1.45)
HFCT-5908E is compliant to the
intermediate SONET OC12/SDH
STM(S4.1) specifications
Multisourced 2 x 5 package style
with MT-RJ receptacle
Single +3.3 V power supply
Wave solder and aqueous wash
process compatible
Manufactured in an ISO9002
certified facility
Performance
HFBR-5908E:
Links of 500 m with 62.5/125 m
MMF for 622 Mb/s
HFCT-5908E:
Links of 15 km with 9/125 m SMF
Unconditionally eye safe laser
IEC 825/CDRH Class 1 compliant
Applications
HFBR-5908E:
ATM 622 Mb/s MMF links from
switch-to-switch in the end-user
premise
Private MMF interconnects at
622 Mb/s SONET STS-12/SDH
STM-4 rate
HFCT-5908E:
ATM 622 Mb/s SMF links from
switch-to-switch or switch-to-
server in the end-user premise
Private SMF interconnects at
622 Mb/s SONET STS-12/SDH
STM-4 rate
2
Functional Description
Receiver Section
Design
The receiver section of the
HFBR/HFCT-5908E contains an
InGaAs/InP photo detector and a
preamplifier mounted in an
optical subassembly. This optical
subassembly is coupled to a
postamp/decision circuit on a
separate circuit board.
The postamplifier is ac coupled to
the preamplifier as illustrated in
Figure 1. The coupling capacitors
are large enough to pass the
SONET/SDH test pattern at
622 MBd without significant
distortion or performance penalty.
If a lower signal rate, or a code
which has significantly more low
frequency content is used,
sensitivity, jitter and pulse
distortion could be degraded.
Figure 1 also shows a filter
network which limits the
bandwidth of the preamp output
signal. The filter is designed to
bandlimit the preamp output noise
and thus improve the receiver
sensitivity.
These components will also
reduce the sensitivity of the
receiver as the signal bit rate is
increased above 622 MBd.
Noise Immunity
The receiver includes internal
circuit components to filter power
supply noise. Under some
conditions of EMI and power
supply noise, external power
supply filtering may be necessary.
A power supply filter circuit is
shown in the Application Section.
The Signal Detect Circuit
The signal detect circuit works by
sensing the peak level of the
received signal and comparing
this level to a reference.
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
FILTER
GND
AMPLIFIER
PECL
OUTPUT
BUFFER
TTL
OUTPUT
BUFFER
DATA OUT
SIGNAL DETECT
CIRCUIT
SD
DATA OUT
Figure 1. Receiver Block Diagram
3
Functional Description
Transmitter Section
Design
The transmitter section of the
HFBR/HFCT-5908E uses a buried
heterostructure Fabry Perot laser
as its optical source. The package
of this laser is designed to allow
repeatable coupling into single
mode fiber for the HFCT-5908E
and multimode fiber for the
HFBR-5908E. In addition, this
package has been designed to be
compliant with IEC 825 Class 1
and CDRH Class I eye safety
requirements. The optical output
is controlled by a custom IC
which detects the laser output via
the monitor photodiode. This IC
provides both dc and ac current
drive to the laser to ensure correct
modulation, eye diagram and
extinction ratio over temperature,
supply voltage and life.
DATA
DATA
PECL
INPUT
LASER
MODULATOR
LASER
LASER BIAS
DRIVER
LASER BIAS
CONTROL
PHOTODIODE
(rear facet monitor)
Figure 2. Simplified Transmitter Schematic
4
Pin 1
TOP VIEW
7.11
(0.28)
4.57
(0.18)
10.0
(0.394)
MAX.
13.59
(0.535)
MAX.
12.4
(0.488)
7.59
(0.299)
17.778
(0.7)
1.778
(0.07)
7.112
(0.28)
0.61
(0.024)
+0
0.2
(+000)
(008)
10.16
(0.4)
13.97
(0.55)
MIN.
FRONT VIEW
4.5 0.2
(0.177 0.008)
(PCB to OPTICS
CENTER LINE)
5.15
(0.20)
(PCB to OVERALL
RECEPTACLE
CENTER LINE)
DIMENSIONS IN MILLIMETERS (INCHES)
NOTES:
1. THIS PAGE DESCRIBES THE MAXIMUM PACKAGE OUTLINE, MOUNTING STUDS, PINS AND THEIR RELATIONSHIPS TO EACH OTHER.
2. TOLERANCED TO ACCOMMODATE ROUND OR RECTANGULAR LEADS.
3. THE 10 I/O PINS, 2 SOLDER POSTS AND 4 PACKAGE GROUNDING TABS ARE TO BE TREATED AS A SINGLE PATTERN, SEE FIGURE 8.
4. THE MT-RJ HAS A 750 m FIBER SPACING.
5. THE MT-RJ ALIGNMENT PINS ARE IN THE MODULE.
6. SEE MT-RJ TRANSCEIVER PIN OUT DIAGRAM FOR DETAILS.
SIDE VIEW
Full Radius
49.56 (1.951)
9.8
(0.386)
MAX.
9.3
(0.366)
MAX.
1.07
(0.042)
3.3
(0.13)
1
(0.039)
0.25
(0.01)
37.56 (1.479) MAX.
Figure 3. HFBR-5908E/HFCT-5908E Package Outline Drawing
5
Connection Diagram
Figure 4. Pin Out Diagram
Pin Descriptions:
Pin 1 Receiver Signal Ground
V
EE
RX:
1
Directly connect this pin to the
receiver ground plane.
Pin 2 Receiver Power Supply
V
CC
RX:
Provide +3.3 V dc via the
recommended receiver power
supply filter circuit. Locate the
power supply filter circuit as close
as possible to the V
CC
RX pin.
Pin 3 Signal Detect SD:
Normal optical input levels to the
receiver result in a logic "1"
output.
Low optical input levels to the
receiver result in a fault condition
indicated by a logic "0" output.
This Signal Detect output can be
used to drive a TTL input on an
upstream circuit, such as Signal
Detect input or Loss of Signal-bar.
Pin 4 Receiver Data Out Bar RD-:
No internal terminations are
provided. See recommended
circuit schematic.
TRANSMITTER DATA IN BAR
TRANSMITTER DATA IN
TRANSMITTER DISABLE
TRANSMITTER SIGNAL GROUND
TRANSMITTER POWER SUPPLY
RX TX
f
f
f
f
f
1
2
3
4
5
f
f
f
f
f
10
9
8
7
6
RECEIVER SIGNAL GROUND
RECEIVER POWER SUPPLY
SIGNAL DETECT
RECEIVER DATA OUT BAR
RECEIVER DATA OUT
Top
View
Mounting Studs/
Solder Posts
Package
Grounding Tabs
Pin 5 Receiver Data Out RD+:
No internal terminations are
provided. See recommended
circuit schematic.
Pin 6 Transmitter Power Supply
V
CC
TX:
Provide +3.3 V dc via the
recommended transmitter power
supply filter circuit. Locate the
power supply filter circuit as close
as possible to the V
CC
TX pin.
Pin 7 Transmitter Signal Ground
V
EE
TX:
Directly connect this pin to the
transmitter ground plane.
Pin 8 Transmitter Disable T
DIS
:
Optional feature, connect this pin
to +3.3 V TTL logic high "1" to
disable module. To enable module
connect to TTL logic low "0".
Pin 9 Transmitter Data In TD+:
No internal terminations are
provided. See recommended
circuit schematic.
Pin 10 Transmitter Data In Bar TD-:
No internal terminations are
provided. See recommended
circuit schematic.
Mounting Studs/Solder Posts
The two mounting studs are
provided for transceiver
mechanical attachment to the
circuit board. It is recommended
that the holes in the circuit board
be connected to chassis ground.
Package Grounding Tabs
Connect four package grounding
tabs to signal ground.
Note: 1. The Transmitter and Receiver V
EE
connections are commoned within the module.