Transcript
PRELIMINARY PRODUCT SPECIFICATION
FS-EDLT
650 nm 100 Mbps Ethernet Fiber Optic Transceiver for Free Space Optical Links Seamless Digital to Light/ Light to Digital Conversion
FEATURES
DESCRIPTION
• Simple low-cost transceiver with integrated optics for high-speed, free-space communication for board-toboard galvanic isolation and electro-mechanical applications
Firecomms FS-EDLT transceiver efficiently combines a pair of Firecomms Fast Ethernet optical EDL300 components with specially designed transmitter and receiver lenses. The transmitter side of the transceiver emits a visible, uniform low-divergent beam while the receiver is optimized for maximum collection efficiency and receiver sensitivity. With a pair of FS-EDLT components, a high-integrity Fast Ethernet free-space link over distances of greater than 50 cm can be effortlessly implemented.
• 125 Mbps free space transmission over distances of greater than 0.5 m • Integrated optics create visible, uniform low-divergent beam to simplify alignment • Full duplex operation • Eye safe • Compatible with IEEE 802.3u Fast Ethernet data communications standard • Logic interface compatible with both LVDS (Low-Voltage Differential Signaling) and CML (Current-Mode Logic) • Integrated CMOS LED driver IC • Mechanically and electrically interchangeable with Firecomms OptoLock™ EDL300T transceiver • Visible (red) high-speed Resonant Cavity LED at 650 nm • Resonant Cavity LED reliability tested to over 400,000 hours lifetime • Integrated high sensitivity receiver IC and pin-diode for one-step light-to-digital conversion • Optimized for high-speed Fast Ethernet of 125 Mbps • RoHS compliant
The FS-EDLT components can be used to provide a data link with voltage isolation between PCBs, or to provide a data path in an electro-mechanical assembly where, due to continuous rotation, a cable assembly is not a viable solution. In addition the FSEDLT also may be used to replace short data cable assemblies that are exposed to a high number of bending cycles such as in a power train. The FS-EDLT uses eye safe 650 nm RCLEDs as the high-speed emitter source to provide high levels of output power with short rise and fall times enabling Ethernet-compliant signaling over a wide temperature range. Digital electrical inputs and outputs are compatible with low-voltage differential signaling levels for simple integration with Ethernet PHY chips.
EDL300T (Preliminary) Revision P3 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 2
FREE SPACE PERFORMANCE
Figure 1. Free space test link set-up using Firecomms transceiver evaluation boards (F01281-102) with a PRBS 7 125 Mbps data rate.
Figure 2. FS-EDLT receiver eye diagram collected using the set-up shown in figure 1 at room temperature with a board-to-board separation of 25 cm.
Figure 4. FS-EDLT receiver eye diagram collected using the set-up shown in figure 1 at room temperature with a board-toboard separation of 50 cm.
MAXIMUM FREE SPACE SEPARATION The maximum free space separation that can be achieved will depend upon the precise details of the application configuration including, but not exclusively, the baud rate, operating temperature, and jitter tolerance of the physical layer ICs. However, by way of example, Fast Ethernet free space links have been demonstrated over 50 cm at zero packet loss.
FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 3
SPECIFICATIONS
A B S O L U T E M A X I M U M R A T I N G S [1] Parameter
[1]
Symbol
Minimum
Maximum
Storage Temperature
Tstg
-40
+100
ºC
Operating Temperature
Top
-20
+70
ºC
+260
ºC
+4.5
V
Soldering Temperature[2] Supply Voltage
VCC
-0.5
Unit
Notes: 1. These are absolute maximum ratings at or beyond which the transceiver can be expected to be damaged. 2. 260ºC, 5s 3 times, at least 2.2 mm away from lead root.
TRANSMITTER ELECTRICAL CHARACTERISTICS Parameter
Symbol
Minimum
Typical
Maximum
Unit
DC Supply Voltage
VCC
3.0
3.3
3.6
V
Current Consumption
ICC
55
mA
250
MBd
5
pF
Baud Rate for an 8B/10B Encoded Data Bus Data Input Capacitance Data Input Resistance (Single-ended) Input Common-Mode Range
Baud Rate
10
125
CIN RIN
5
kΩ
VIN-BIAS
GND+0.8
VDD-0.8
V
VIN-SWING
100
1200
mV
Optical Power OFF Delay
TPD
0.02
20
µs
Optical Power ON Delay
TPU
5
µs
Input Voltage Swing
FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 4 TRANSMITTER PIN DESCRIPTION Pin
Name
Symbol
1
Data Input (Negative)
TD-
2
Data Input (Positive)
TD+
3
Ground Pin
GND
4
Input DC Power Pin
VCC
5
Ground or VCC Input (see next table)
Rex
TRANSMITTER SPECIAL FUNCTIONS Function Rex
Description The function of the Rex pin is to allow the user to adjust the optical output power of the transceiver: (1) Rex is pulled to ground (set to low). This is the default position and in this case the part is set to the internal default drive current of the transceiver. This is the recommended setting for normal operation. (2) The Rex pin is pulled high (set to rail voltage 3.3V). The power of the transceiver is reduced by 3 dB. This function can be used to avoid receiver saturation in circumstances where the separation of the Tx and Rx transceivers is small (< 2 cm).
TRANSMITTER OPTICAL CHARACTERISTICS Parameter
Symbol
Minimum
Typical
Maximum
Unit
λpeak
640
660
670
nm
∆λ
23
30
nm
Beam Divergence (FWHM)
ϑ
5
Average Output Power at TA=-40 to 70ºC[1] Optical Rise Time, 250 Mbps (20%-80%) Optical Fall Time (80%-20%)
P
Extinction Ratio
RE
Peak Wavelength (TA=-40 to 70ºC) Spectral Bandwidth (FWHM)
-7
Deg -2.0
dBm
tr
1.5
2.0
ns
tf
2.0
3.0
ns
10.0
dB
Maximum Systematic Jitter[1]
0.8
ns
Maximum Random Jitter[1]
0.8
ns
Note: 1. Maximum jitter measured at 125 Mbaud. FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 5 RECEIVER CHARACTERISTICS Parameter
Symbol
Minimum
Typical
Maximum
Unit
DC Supply Voltage
VCC
3.0
3.3
3.6
V
Current Consumption
ICC
45
mA
Output Impedance Between D and D Offset Common Mode Voltage
Vocm
Output Differential Voltage Swing SD (Signal Detect) Assert Voltage (Output High) SD Deassert Voltage (Output Low) SD Assert/Deassert Time
100
Ohm
1.2
V
500 VSD-A
600
2.4
V
VSD-DA
Receivable Optical Power Sensitivity (SD on) Maximum Allowed Optical Power Baud Rate for an 8B/10B Encoded Data Bus Rise/Fall Time (10%-90%)
Baud Rate
Field of View
FOV
mV
0.4
V
0.5
5
100
us
-24
-26
-28
dBm
-2
dBm
250
MBd
2
ns
10
125
+5
Deg
RECEIVER PIN DESCRIPTION Pin
Name
Symbol
1
Input DC Power Pin
VCC
2
Ground Pin
GND
3
Output Signal Detect
SD
4
Data Input (Negative)
RD
5
Data Input (Positive)
RD+
FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 6
ORDERING INFORMATION
ORDERING INFORMATION Part Number
Name
Description
FS-EDL300T-XX
TBD
650 nm RCLED-Based Transceiver for Free Space Communication
GENERAL APPLICATION CIRCUIT
Figure 4. General application circuit.
Notes: A. Power line capacitors should be placed as close to the device as possible. B. Rex must be shorted to ground or pulled high. Rex must not be allowed to float.
FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein.
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
FS-EDLT Page 7
MECHANICAL DATA
Figure 7. Mechanical data for the Firecomms transceiver FS-EDL300T.
Copyright (c) 2007 Firecomms Ltd. FS-EDLT (Preliminary) Revision P1 Firecomms assumes no responsibility for inaccuracies or omissions in the information contained in this document. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. OptoLock is a trademark of Firecomms, Ltd.
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05/10 / V1 / HW / firecomms/ fs-edlt.pdf
LASER COMPONENTS (UK) Ltd Goldlay House, 114 Parkway, Chelmsford, Essex. CM2 7PR, Phone: 01245 491 499, Fax: 01245 491 801,
[email protected]
