Optoway
LT-94C73C-P1G
LT-94C73C-P1G
1
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(RoHS Compliant)
3.3V / 2.488 Gbps 1490 nm Continuous-Mode TX /
1.244 Gbps 1310 nm Burst-Mode RX with Burst-Mode Signal Detect,
ITU-T G.984.2 G-PON
CLASS C
2X5 SFF OLT Transceiver
(with Reset-Less RX)
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Class C Optical Line Terminal (OLT) for ITU-T G.984.2
Gigabit-capable PON
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2.488 Gbps / 1490 nm Continuous-Mode Transmitter
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1.244 Gbps / 1310 nm Burst-Mode Receiver with 2R
Output
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Resetless
BM Receiver Design
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BM RX with 32 Bits Packet-to-packet Guard Time for
over 15dB Packet Optical Power Difference
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0 to 70
o
C Operating
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2x5 SFF Package with SC/PC Pigtail
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Single +3.3 V Power Supply
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RoHS Compliant
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Transmitter: AC Coupling Input
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Receiver: DC Coupling Output
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LVTTL TX Shutdown Input
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LVTTL High-Speed Burst-mode RX Signal Detect
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Wave Solderable and Aqueous Washable
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Class 1 Laser International Safety Standard IEC-60825
Compliant
FEATURES
DESCRIPTION
LT-94C73C series is ITU-T G.984.2 Class C optical line
terminal (OLT) for 2.488 Gbps/1490 nm in downstream and
1.244 Gbps/1310 nm in upstream. The transmitter section uses
a multiple quantum well 1490 nm DFB laser and is a class 1
laser compliant according to International Safety Standard
IEC-60825. The receiver section uses an integrated 1310 nm
burst-mode detector preamplifier (IDP) mounted in an optical
header and a burst-mode limiting post-amplifier IC.
Unlike
the conventional BM RX, the RX does not requires reset
pulse to receive optical data packets with different optical
power.
LVPECL interface is used for differential inputs and
outputs. A LVTTL logic interface simplifies interface to
external circuitry.
LASER SAFETY
This single mode transceiver is a Class 1 laser product. It
complies with IEC-60825 and FDA 21 CFR 1040.10 and
1040.11. The transceiver must be operated within the
specified temperature and voltage limits. The optical ports of
the module shall be terminated with an optical connector or
with a dust plug.
APPLICATIONS
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Broadband G-PON System
ORDER INFORMATION
P/No
Class
Type
LT-94C73C-P1G
LT-94B73B-P1G
C
B+
CNT
CNT
Speed
(Gb/s)
2.488
2.488
1490 DFB
1490 DFB
TX
λ
(nm)
Power Type
(dBm)
RX
Speed
λ
(nm) Sens.
(Gb/s)
1310
1310
(dBm)
-8 / -29 0 / 70
-8 / -28 0 / 70
-8 / -28
-20 / 85
SFF 2X5
SFF 2X5
SFF 2X5
Yes
Yes
Yes
Temp
( C)
o
Package
RoHS
Compliant
7 / 3 BM, 2R 1.244
1.5 / 5 BM, 2R 1.244
LT-94B73B-P1-AG
B+
CNT 2.488
1490 DFB 1.5 / 5 BM, 2R 1.244 1310
NOTE: 1. LT-XXXXXX-PWXG, SC/PC pigtail with fiber length 50 cm.
2. BM: Burst Mode; CNT: Continuous Mode; SFF: Small Form Factor Package.
*****************************************************************************************************************************************************************************
OPTOWAY TECHNOLOGY INC.
No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303
Tel: 886-3-5979798
Fax: 886-3-5979737
E-mail: sales@optoway.com.tw http: // www.optoway.com.tw
5/1/2006 V1.0
Optoway
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Case Temperature
Power Supply Voltage
Symbol
Tstg
Topr
Vcc
Min
-40
0
-0.5
Max
85
70
3.6
Units
o
C
o
C
V
LT-94C73C-P1G
Notes
Air flow 1m/sec @>60
o
C
2
*****************************************************************************************************************************************************************************
Recommended Operating Conditions
Parameter
Power Supply Voltage
Operating Case Temperature
Power Supply Current
Symbol
Vcc
Topr
I
CC (TX+RX)
Min
3.13
0
Max.
3.47
70
350
Unit
V
o
C
mA
Units / Notes
V
Air flow 1m/sec @>60
o
C
Transmitter Specifications ( 0
o
C < Topr < 70
o
C, 3.13V < Vcc < 3.47V )
Parameter
Symbol
Min.
Typ.
Max.
7
1500
1
Units
dBm
nm
nm
dB
dB
Gb/s
ps
ps
dB/Hz
dB
µA
µA
mV
V
V
µs
Notes
1
-20 dB Width
Optical
Optical Transmit Power
Po
3
Output Center Wavelength
1480
λ
Δλ
Output Spectrum Width
SMSR
Side Mode Suppression Ratio
30
Extinction Ratio
E
R
10
Data Rate
Optical Rise Time
Optical Fall Time
Relative Intensity Noise
RIN
Downstream Optical Penalty
Electrical
Data Input Current
–
Low
-350
Data Input Current
–
High
Differential Input Voltage
V
IH
- V
IL
400
Shutdown Input Voltage -- Low
V
TSHDN,L
0
Shutdown Input Voltage -- High
V
TSHDN,H
2.0
Shut Off Time for Tx Shutdown
t
DIS
1. Output power is power coupled into a 9/125
µm
single mode fiber.
2.488
150
150
-120
0.5
20% to 80% Values
20% to 80% Values
350
2400
0.8
Vcc
30
Peak-to-Peak
TX Output Disable
TX Output Enable
*****************************************************************************************************************************************************************************
OPTOWAY TECHNOLOGY INC.
No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303
Tel: 886-3-5979798
Fax: 886-3-5979737
E-mail: sales@optoway.com.tw http: // www.optoway.com.tw
5/1/2006 V1.0
Optoway
Receiver Characteristics ( 0
o
C < Topr < 70
o
C, 3.13V < Vcc < 3.47V )
Parameter
Symbol
Min.
Typ.
Max.
-29
1360
Units
dBm
dBm
nm
Gb/s
Bits
dB
dB
dBm
dBm
dB
V
V
Bits
V
V
ns
ns
Optical
Sensitivity
Sen
Saturation Optical Power
Sat
-8
Wavelength of Operation
1260
Data Rate
1.244
Packet-to-Packet Guard Time
32
DC Optical Tolerance
Sen +3
Optical Return Loss
20
Signal Detect -- Asserted
Pa
Signal Detect -- Deasserted
Pd
-40
Signal detect -- Hysteresis
2
Electrical
Data Output Voltage
–
Low
V
OL
Vcc - 1.935
Data Output Voltage
–
High
V
OH
Vcc -1.135
Consecutive Identical Digit Immunity
72
Signal Detect Output Voltage -- Low
V
OL
Signal Detect Output Voltage -- High
V
OH
2.0
Signal Detect Assert Time
AS
MAX
10
15
Signal Detect Deassert Time
ANS
MAX
80
100
Rest Between Packet
2. Sensitivity and saturation levels at BER 1E-10 for a 2
23
-1 @ER=10.
3. At least 30 dB optical isolation for the wavelength 1480 to 1500 nm.
4. No reset is needed.
5. The optical power difference between neighboring packets is up to 15 dB.
LT-94C73C-P1G
Notes
2
2
3
4,5
3
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-28
Transition: low to high
Transition: high to low
Vcc - 1.56
Vcc - 0.76
0.5
30
150
Resetless
Transition: low to high
Transition: high to low
CONNECTION DIAGRAM
PIN
1
2
3
Signal Name
RX Ground
RX Vcc
RX SD
Description
Receiver Ground. Connect this pin to
ground plane.
RX power supply input. Connect to 3.3
V power supply
Signal Detect. High when single is
present (LVTTL)
Negative RX output, Differential
LVPECL. DC coupled.
Positive RX output, Differential
LVPECL. DC Coupled.
Mounting Studs. Connect to Chassis
Ground
PIN
10
9
8
Signal Name
TD-
TD+
TxDis
Description
Negative transmitter data In. Internally
terminated for LVPECL. AC coupled.
Positive transmitter data In. Internally
terminated for LVPECL. AC coupled.
Transmitter Disable. TX is disabled
when this pin is low. Internally pulled
to
“High”..
Transmitter Ground. Directly connect
this plan to ground plane
TX power supply input. Connect to 3.3
V power supply
4
5
MS
RX OUT (-)
RX OUT (+)
MS
7
6
TX Ground
TX Vcc
*****************************************************************************************************************************************************************************
OPTOWAY TECHNOLOGY INC.
No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303
Tel: 886-3-5979798
Fax: 886-3-5979737
E-mail: sales@optoway.com.tw http: // www.optoway.com.tw
5/1/2006 V1.0
Optoway
PACKET-TO-PACKET SPACING
LT-94C73C-P1G
4
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1.244 Gbps, BER < 10
-10
tg=25 ns
BM Receiver
Output
-13 dBm
-28 dBm
Hi-Lo Optical
Input
Figure 1. High-Low packet test at Hi/Lo ratio=15 dB
*****************************************************************************************************************************************************************************
OPTOWAY TECHNOLOGY INC.
No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303
Tel: 886-3-5979798
Fax: 886-3-5979737
E-mail: sales@optoway.com.tw http: // www.optoway.com.tw
5/1/2006 V1.0
Optoway
TIME CHARACTERISTICS OF SIGNAL DETECT
LT-94C73C-P1G
5
*****************************************************************************************************************************************************************************
RX Output
Signal Detect
Figure 2. Timing characteristics of Signal Detect. Signal Detect: Low to High
~20
ns, High to Low
~100
ns (> 100 bit
“0”)
RECOMMENDED CIRCUIT SCHEMATIC
TX GND
7
8
TX Disable
Vcc3.3V
LD
Driver
100R
TX+
9
Z=50R
LVPECL
TX-
TX Vcc
10
6
1uH
10nF
10uF
1uH
Z=50R
Vcc 3.3V
RX Vcc
2
10nF
10uF
Vcc 3.3V
Vcc 3.3V
130R
130R
TD-
LVPECL
TD+
82R
82R
RX-
Post
Amp
4
Z=50R
RX+
5
Z=50R
3
1
CDR or PHY DEVICE
SD
RX GND
Signal Detect
SFF OLT Module
*****************************************************************************************************************************************************************************
OPTOWAY TECHNOLOGY INC.
No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303
Tel: 886-3-5979798
Fax: 886-3-5979737
E-mail: sales@optoway.com.tw http: // www.optoway.com.tw
5/1/2006 V1.0
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