-RADIANTECHFiber Optic Small Form Factor
Multimode 850 nm 2x5 Optical Transceiver for
1.0625 GBd Fibre Channel and 1.25 Gigabit Ethernet with
LC Duplex Interface
LFT-3143
Product Description
The Gigabit Ethernet multimode transceiver is based on the
Physical-Medium-Dependent (PMD) sublayer and baseband
medium, type 1000BASE-SX (short wavelength). It conforms to
the Small Form Factor (SFF) Multi-Source Agreement (MSA) in
10 pin version (2x5 footprint). The appropriate fiber optic cable is
a 62.5/125 µm or 50/125 µm multimode fiber with LC connectors.
The Gigabit multimode transceiver is a single unit comprised of a
FEATURES
transmitter, a receiver, and a duplex LC receptacle. This transceiver
• IEEE 802.3 Gigabit Ethernet 1000BASE-SX compliant
is specially developed for distances of up to 550 m with 50/125 µm
• Fiber Channel (100-M5-SN-I, 100-M6-SN-I) compliant
multimode fibers.
• 850 nm Vertical Cavity Surface Emitting Laser (VCSEL)
The module is designed for low cost LAN, SAN, WAN, and Gigabit
• Industry standard Small Form Factor (SFF) package
Ethernet applications. It can be used as the network and device
• Multisource 2x5 footprint
interface in mainframes, workstations, servers, and storage devices,
and in a broad range of network devices such as bridges, routers,
• Multimode fiber, LC duplex interface
• Single power supply (3.3 V)
hubs, and local and wide area switches.
This transceiver operates at 1.25 Gbits per second from a single
• Internally terminated and AC coupled data IO
power supply (+3.3 V). The differential data inputs and outputs are
• Signal detect (SD) TTL compatible
internally terminated and AC coupled.
• ESD Class 2 per MIL-STD 883D Method 3015.7
• FCC (Class B) and EN 55022 Compliant
• For distances up to 550 m with 50/125 µm multimode
Functional Description of 2x5 Pin Row Transceiver
The LFT-3143 transceiver is designed to transmit serial data via
multimode cable. The receiver component converts the optical serial
fibers
data into PECL compatible electrical data (RD+ and RD-). The
Signal Detect (SD, active high) shows whether an optical signal is
present.
Functional Diagram
The transmitter converts PECL compatible electrical serial data (TD+
and TD-) into optical serial data. Data lines are differentially 100Ω
terminated.
The transmitter contains a laser driver circuit that drives the
modulation and bias current of the laser diode. The currents are
controlled by a power control circuit to guarantee constant output
power of the laser over temperature and aging. The power control
uses the output of the monitor PIN diode (mechanically built into the
laser coupling unit) as a controlling signal, to prevent the laser power
from exceeding the operating limits.
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LC SFF 2x5 Multimode Transceiver
Transmitter Electro-Optical Characteristics (TA=25oC)
Symbol
Min.
Typ.
Max.
Units
Vcc
3.15
3.30
3.45
V
Launched Power (Average)
PO
-9.5
-3
dBm
Center Wavelength
λC
770
860
nm
Spectral Width(RMS)
∆λ
0.85
nm
Relative Intensity Noise
RIN
-117
dB/Hz
Extinction Ratio (Dynamic)
ER
Supply Voltage
(1)
850
9
dB
Optical Rise Time, 20%–80%
tR
260
ps
Optical Fall Time, 20%–80%
tF
260
ps
Total Contributed Jitter
TJ
225
ps
Input Differential Voltage Swing
VIN
0.3
1.6
V
Transmitter Disable Voltage
VDIS
Vcc-1.3
Vcc
V
Transmitter Enable Voltage
VEN
Vee
Vee+0.8
V
Supply Current
ITX
130
mA
Notes: 1. Into a multimode fiber, 50-µm core diameter.
Receiver Electro-Optical Characteristics (TA=25oC)
Supply Voltage
(1)
Sensitivity (Average Power)
Symbol
Min.
Typ.
Max.
Units
Vcc
3.15
3.30
3.45
V
-19
–17
dBm
PSEN
Saturation (Average Power)
PSAT
(2)
Stressed Receive Sensitivity
-3
PSTR
Operating Center Wavelength
λR
Signal Detect Assert Level(3)
770
PSDA
(4)
Signal Detect Deassert Level
PSDD
-30
Signal Detect Hysteresis
PSDA - PSDD
0.5
Signal Detect Assert Time
dBm
-13.5
dBm
860
nm
–18
dBm
dBm
5
dB
tSDA
100
µs
Signal Detect Deassert Time
tSDD
350
µs
Differential Data Output Voltage Swing
VOUT
0.4
1.6
V
Signal Detect Output Voltage–LOW (TTL)
VSD_L
0
0.6
V
Signal Detect Output Voltage–HIGH (TTL)
VSD_H
2.3
Vcc
V
400
ps
Output Data Rise/Fall Time, 20%-80%
tr, tf
Return Loss of Receiver
RL
Supply current
(5)
12
IRX
dB
130
mA
Notes
1. Average optical power at which the BER is 1×10-12. Measured with a 27-1 NRZ PRBS and ER=9 dB.
2. Measurement is made through a 50/125 µm multimode fiber.
3. Optical power above which the SIGNAL DETECT toggles from Low to High state.
4. Optical power below which the SIGNAL DETECT toggles from High to Low state.
5. Supply current including Rx outputs into a 50 Ω load.
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LC SFF 2x5 Multimode Transceiver
Absolute Maximum Ratings
Parameter
Rating
Storage Temperature
-40oC to +85 oC
Operating Temperature
0 oC to +70 oC
Power Supply Voltage (Vcc)
-0.5 V to 5.0 V
Differential Data Input Voltage
Vcc+0.5 V
Soldering Conditions, Temperature/Time (MIL-STD 883C, Method 2003)
250 oC / 5.5 sec
Regulatory Compliance
Feature
Standard
Comments
Electrostatic Discharge (ESD) to the
MIL-STD 883D
Electrical Pins
Method 3015.7
Immunity:
EN 61000-4-2
IEC 1000-4-2
Discharges of ±15kV with an air discharge probe on the
EN 61000-4-3
IEC 1000-4-3
With a field strength of 3 V/m rms, noise frequency
Radio Frequency Electromagnetic Field
Emission:
FCC Class B EN 55022
Noise frequency range:
Electromagnetic Interference (EMI)
Class B CISPR 22
30 MHz to 5 GHz
Electrostatic Discharge (ESD) to the
Class 1(>1000V)
receptacle cause no damage.
Duplex LC Receptacle
Immunity:
ranges from 10 MHz to 1 GHz. No effect on transceiver
performance between the specification limits.
LASER SAFETY
This multimode Gigabit Ethernet transceiver is a Class 1 laser product. It complies with IEC 60825-1 and FDA 21 CFR 1040.10 and 1040.11. The
transceiver must be operated under recommended operating conditions. Because the transceiver design is designed to be inherently eye safe, it
does not require open fiber control thus eliminating complex electronics or mechanics.
Caution
The use of optical instruments with this product will increase eye hazard!
General Restrictions
Classification is valid only if the module is operated within the specified temperature and voltage limits. The system using the module must provide
power supply protection that guarantees that the system power source will cease to provide power if the maximum recommended operation limit or
more is detected on the +3.3 V at the power source. The case temperature of the module must be in the temperature range given in the
recommended operating limits. These limits guarantee the laser safety.
Usage Restrictions
The optical ports of the modules shall be terminated with an optical connector or with a dust plug.
Note
Failure to adhere to the above restrictions could result in a modification that is considered an act of “manufacturing,” and will require, under law,
recertification of the modified product with the U.S. Food and Drug Administration (ref. 21 CFR 1040.10 (i))
Laser Data
Wavelength
Total output power (as defined by IEC: 50 mm
aperture at 10 cm distance)
Total output power (as defined by FDA: 7 mm
aperture at 20 cm distance)
Beam divergence
3/5
850 nm
<400 µW
Required Label and Warning Sign
<70 µW
12o
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LC SFF 2x5 Multimode Transceiver
Pin Description
Pin Name
Level/Logic
Pin#
Description
VeeR
Receiver Signal Ground
N/A
1
Receiver Signal Ground
VccR
Receiver Power Supply
N/A
2
Receiver Power Supply
SD
Signal Detect
TTL compatible
3
Normal Operation: Logic “1” Output, represents that light is
present at receiver input.
Fault Condition: Logic “0” Output
RD-
Received Data Out Not
RD+
Received Data Out
PECL, AC coupled
4
Receiver Data Out
PECL, AC coupled
5
Receiver Data Out
VccT
N/A
6
Transmitter Power Supply
VeeT
N/A
7
Transmitter Signal Ground
Transmit Disable
TTL compatible
8
Transmitter Laser Control
TD+
Transmit Data
PECL, AC coupled
9
Transmitter Data In
TD-
Transmit Data not
PECL, AC coupled
10
Transmitter Data In
MS
MS
N/A
MS
Mounting Studs
Tdis
The mounting studs are provided for transceiver mechanical
attachment to the circuit board. They also provide an optional
connection of the transceiver to the equipment chassis ground.
The holes in the circuit board must be tied to chassis ground.
Recommended interface diagram
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LC SFF 2x5 Multimode Transceiver
Small Form Factor multisource footprint and dimensions
Dimensions in (m m ) inches
)
(
1
)
(
2
)
(
7.11
.28
4.57
.18
2
4x
(13.59)
.535 M ax.
(10.16)
.400
-B(12)
.472
(7.75)
.305
-C-
1.78
4x
.070
(17.78)
.7
0
(1.07 -0.1
)
2x
.042 +.000
-.004
(7.12)
.280
0
10x
Circuit Board Layout
Recom m ended PCB thickness: m ax. (2.54)0.1
(6x)
2
0.05 M
(0.61-0.2)
.024 +.000
-.008
(49.56)M ax.
1.951
(37.56)M ax.
1.479
(1.4 ±0.1 )
.055 ±0.04
6x
(13.34)
.53
)
(
(13.97)
.550 M in Pitch
(0.9 m ax)
.035 m ax
3.56
.14
(9.8)
M ax.
.386
Holes for
housing leads
-A-
10x
(3.1)
.12
(10x)
(0.81 ±0.1 )
.032 ±0.04
(3.0)
.118
0 M
TX
10
9
8
7
6
3
4
5
2x5 PIN M odule Top VIEW
1
RX
2
1. Toleranced to accom m odate round or rectangular leads.
2. 4 optional package grounding tabs.
10 pin m odule requires only 12 PCB holes.
WARRANTY/REMEDY
Radiantech Inc. warrants goods of its manufacture as being free of
defective material and faulty workmanship. Contact your local sales
office for warranty information. If warranted goods are returned to
Radiantech during that period of coverage, Radiantech will repair or
replace without charge those items it finds defective. The foregoing
is Buyer’s sole remedy and is in lieu of all other warranties,
expressed or implied, including those of merchantability and
fitness for a particular purpose.
While we provide application assistance, personally, through our
literature, and through the Radiantech website, it is up to the
customer to determine the suitability of the product in the application.
Specifications may change at any time without notice. The
information we supply is believed to be accurate as of this printing.
However, we assume no responsibility for its use.
SALES AND SERVICE
Radiantech Inc. serves its customers through a worldwide
network of agents and distributors. For application assistance,
current specifications, or the nearest service provider, please
contact us through following ways:
TELEPHONE
+886-3-577-7818
FAX
+886-3-577-7817
Web Site
http://www.radiantech.com.tw/
Mail to
[email protected]
Radiantech Inc.
No. 2-1 Industrial East Road I,
SBIP (Science-Based Industrial Park)
Hsinchu 300, Taiwan, R.O.C.
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www.radiantech.com.tw
LC SFF 2x5 Multimode Transceiver