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LT-74H73H-PG
LT-74H73H-PG
1
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(RoHS Compliant)
3.3V, 1.25 Gbps 1490 nm Continuous-Mode TX / 1.25 Gbps 1310 nm Burst-Mode RX 2X5 SFF Package, GE-PON OLT Transceiver (IEEE 802.3ah-2004 1000BASE PX20+)
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FEATURES
l Optical Line Terminal (OLT) for IEEE 802.3ah-2004 1000BASE-PX20+ l 1-Fiber Bi-directional 1.25 Gbps WDM Transceiver for 20 km communication l 1490 nm Continuous-Mode Transmitter l 1310 nm Burst-Mode (BM) Receiver l Resetless BM Receiver Design l BM RX with Transceiver Settling Time less than 400 ns l High Resistance of BM RX to DC Optical Background l 0 to 70oC Operating Temperature l 2x5 SFF Package with SC/PC Pigtail l Single +3.3 V Power Supply l RoHS Compliant l Transmitter: AC Coupling Input l Receiver: DC Coupling Output l LVPECL Differential Inputs and Outputs l LVTTL TX Shutdown Input l LVTTL TX Laser Failure Alarm Output l Wave Solderable and Aqueous Washable l Class 1 Laser International Safety Standard IEC-60825 Compliant
DESCRIPTION
LT-74H73H is an optical transceiver for optical line terminal (OLT) for IEEE 802.3ah-2004 1000BASE-PX20+ applications. The LT-74H73H is high performance module for single fiber communications by using 1490 nm continuous-mode transmitter and 1310 nm high sensitivity burst-mode receiver with settling time less than 400 ns. The transmitter section uses a 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 Avalanche photodetector preamplifier 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
l Gigabit Ethernet PON System
ORDER INFORMATION ORDER INFORMATION
P/No Class Type Speed TX (nm) Power Type RX Speed (nm) Sens. Temp ( C)
o
Package
RoHS Compliant Yes
(Gb/s) (dBm) (Gb/s) LT-74H73H-PG PX20+ CNT 1.25 1490 DFB 7 / 2 BM, 2R 1.25 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.
(dBm) -8 / -30 0 / 70 SFF 2X5 Pig.
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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
3/1/2006 V1.0
Optoway
Absolute Maximum Ratings
Parameter Power Supply Voltage Input Voltage Output Current Operating Case Temperature Storage Temperature Soldering Temperature Tension of Fiber Bending Radius of Fiber Symbol Vcc Iout Topr Tstg Min. 0 GND 0 0 -40 Max. 4 Vcc 30 70 85 260 500 Unit V V mA o C o C o C g mm
LT-74H73H-PG
Notes
2
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With air flow 1m/sec 10 seconds on leads only
30
Stress in excess of the maximum absolute ratings can cause permanent damage to the module.
Recommended Operating Conditions
Parameter Power Supply Voltage Operating Case Temperature Supply Current Symbol Vcc Topr Icc TX+RX Min. 3.13 0 Max. 3.47 70 300 Unit V o C mA Notes 3.3 V +/- 5% With air flow 1m/sec
Transmitter Specifications ( 0oC < Topr < 70oC, 3.13V < Vcc < 3.47V )
Parameter Symbol Min. Typ. Max. Units dBm nm nm dB dB Gb/s ns ns dB/Hz ns A A mV V V V V s Notes 1 -20 dB Width Optical Optical Transmit Power Po 2 7 Output Center Wavelength 1480 1500 Output Spectrum Width 1 SMSR Side Mode Suppression Ratio 30 Extinction Ratio ER 9 Data Rate 1.25 Optical Rise Time 0.26 Optical Fall Time 0.26 Relative Intensity Noise RIN -120 Total Jitter 0.15 Electrical Data Input Current - Low -350 Data Input Current - High 350 Differential Input Voltage VIH - VIL 150 2000 Data Input Voltage - Low VIL - VCC -2.0 -1.58 Data Input Voltage -- High VIH - VCC -1.1 -0.74 Shutdown Input Voltage -- Low VTSHDN,L 0 0.5 Shutdown Input Voltage -- High VTSHDN,H 2.0 Vcc Shut Off Time for Tx Shutdown tDIS 30 1. Output power is power coupled into a 9/125 m single mode fiber. 2. These inputs are compatible with 10K, 10KH and 100K ECL and LVPECL inputs.
20% to 80% Values 20% to 80% Values
2 2 TX Output Disable TX Output Enable
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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
3/1/2006 V1.0
Optoway
Receiver Characteristics ( 0oC < Topr < 70oC, 3.13V < Vcc < 3.47V )
Parameter Symbol Min. Typ. Max. Units
LT-74H73H-PG
Notes
3
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Optical Sensitivity Sen -30 dBm 3 Saturation Optical Power Sat -8 dBm 3 Wavelength of Operation 1260 1360 nm 4 Data Rate 1.25 Gb/s Settling Time 400 ns 5, 6 DC Optical Tolerance Sen +3 dB Optical Return Loss 20 dB Electrical Data Output Voltage - Low VOL - VCC -2.0 -1.58 V 7 Data Output Voltage - High VOH - VCC -1.1 -0.74 V 7 Rest Between Packet Resetless 3. Sensitivity and saturation levels at BER 1E-12 @ 27-1@ER=10. The burst packet data pattern follows 8B10B protocol. 4. At least 30 dB optical isolation for the wavelength 1480 to 1500 nm. 5. No reset is needed. 6. The optical power difference between neighboring packets is up to 15 dB. 7. These inputs are compatible with 10K, 10KH and 100K ECL and LVPECL outputs.
CONNECTION DIAGRAM
PIN
1 2 3
Signal Name
RX Ground RX Vcc NC
Description
Receiver Ground. Connect this pin to ground plane. RX power supply input. Connect to 3.3 V power supply No connection
PIN
10 9 8
Signal Name
TDTD+ 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
Negative RX output, Differential LVPECL. DC coupled. Positive RX output, Differential LVPECL. DC Coupled. Mounting Studs. Connect to Chassis Ground
7 6
TX Ground TX Vcc
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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
3/1/2006 V1.0
Optoway
RECOMMENDED CIRCUIT SCHEMATIC
TX GND 7 8 TX Disable
LT-74H73H-PG
4
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Vcc3.3V
LD Driver 100R
TX+
9 Z=50R LVPECL
TXTX 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 TDLVPECL TD+ 82R 82R
RXPost Amp
4 Z=50R
RX+
5 Z=50R
RX GND
1 CDR or PHY DEVICE
SFF OLT Module
PACKAGE DIAGRAM
Units in mm
Note: Specifications subject to change without notice. The 50 +/- 3 cm long pigtail with a SC/PC connector is standard. If non-standard pigtail is required, please make a contact with Optoway Technology Inc.
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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
3/1/2006 V1.0
Optoway
RECOMMENDED CIRCUIT BOARD LAYOUT
LT-74H73H-PG
5
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Notes: 1. This figure describes the recommended circuit board layout for the SFF OLT Transceiver. 2. The hatched areas are keep-out areas reserved for housing standoff. No metal traces or ground connection in keep-out area. 3. The mounting studs should be solder to chassis ground for mechanical integrity.
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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
3/1/2006 V1.0

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