optoway LT-74D73D-PG ***************************************************************************************************************************************************************************** ***************************************************************************************************************************************************************************** optoway technology inc. no .3 8, 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 1 LT-74D73D-PG (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 px10) **************************************************************************************************************************************************************************** features l optical line terminal (olt) for ieee 802.3ah-2004 1000base-px10 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 70 o c 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 applications l gigabit ethernet pon system description lt-74d73d is an optical transceiver for optical line terminal (olt) for ieee 802.3ah-2004 1000base-px10 applications. the lt-74d73d 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. order information tx rx p/no class type speed (gb/s) (nm) power (dbm) type speed (gb/s) (nm) sens. (dbm) temp ( o c) package rohs compliant LT-74D73D-PG px10 cnt 1.25 1490 dfb 2 / -3 bm, 2r 1.25 1310 -3 / -24 0 / 70 sff 2x5 pig. yes 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 LT-74D73D-PG ***************************************************************************************************************************************************************************** ***************************************************************************************************************************************************************************** optoway technology inc. no .3 8, 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 2 absolute maximum ratings parameter symbol min. max. unit notes power supply voltage vcc 0 4 v input voltage gnd vcc v output current iout 0 30 ma operating case temperature topr 0 70 o c with air flow 1m/sec storage temperature tstg -40 85 o c soldering temperature 260 o c 10 seconds on leads only tension of fiber 500 g bending radius of fiber 30 mm stress in excess of the maximum absolute ratings can cause permanent damage to the module. recommended operating conditions parameter symbol min. max. unit notes power supply voltage vcc 3.13 3.47 v 3.3 v +/- 5% operating case temperature topr 0 70 o c with air flow 1m/sec supply current icc tx+rx 300 ma transmitter specifications ( 0 o c < topr < 70 o c, 3.13v < vcc < 3.47v ) parameter symbol min. typ. max. units notes optical optical transmit power po -3 2 dbm 1 output center wavelength l 1480 1500 nm output spectrum width ? 1 nm -20 db width side mode suppression ratio smsr 30 db extinction ratio e r 9 db data rate 1.25 gb/s optical rise time 0.26 ns 20% to 80% values optical fall time 0.26 ns 20% to 80% values relative intensity noise rin -120 db/hz total jitter 0.15 ns electrical data input current C low -350 m a data input current C high 350 m a differential input voltage v ih - v il 150 2000 mv data input voltage C low v il - v cc -2.0 -1.58 v 2 data input voltage -- high v ih - v cc -1.1 -0.74 v 2 shutdown input voltage -- low v tshdn,l 0 0.5 v tx output disable shutdown input voltage -- high v tshdn,h 2.0 vcc v tx output enable shut off time for tx shutdown t dis 30 m s 1. output power is power coupled into a 9/125 m m single mode fiber. 2. these inputs are compatible with 10k, 10kh and 100k ecl and lvpecl inputs.
optoway LT-74D73D-PG ***************************************************************************************************************************************************************************** ***************************************************************************************************************************************************************************** optoway technology inc. no .3 8, 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 3 receiver characteristics ( 0 o c < topr < 70 o c, 3.13v < vcc < 3.47v ) parameter symbol min. typ. max. units notes optical sensitivity sen -24 dbm 3 saturation optical power sat -3 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 C low v ol - v cc -2.0 -1.58 v 7 data output voltage C high v oh - v cc -1.1 -0.74 v 7 rest between packet resetless 3. sensitivity and saturation levels at ber 1e-12 @ 2 7 -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 signal name description pin signal name description 1 rx ground receiver ground. connect this pin to ground plane. 10 td- negative transmitter data in. internally terminated for lvpecl. ac coupled. 2 rx vcc rx power supply input. connect to 3.3 v power supply 9 td+ positive transmitter data in. internally terminated for lvpecl. ac coupled. 3 nc no connection 8 txdis transmitter disable. tx is disabled when this pin is low. internally pulled to high .. 4 rx out (-) negative rx output, differential lvpecl. dc coupled. 7 tx ground transmitter ground. directly connect this plan to ground plane 5 rx out (+) positive rx output, differential lvpecl. dc coupled. 6 tx vcc tx power supply input. connect to 3.3 v power supply ms ms mounting studs. connect to chassis ground
optoway LT-74D73D-PG ***************************************************************************************************************************************************************************** ***************************************************************************************************************************************************************************** optoway technology inc. no .3 8, 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 4 recommended circuit schematic 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. vcc 3.3v 10nf 10uf 1uh 1uh z=50r z=50r z=50r z=50r 130r 82r 82r 130r vcc 3.3v lvpecl lvpecl vcc 3.3v vcc3.3v td- td+ cdr or phy device ld driver post amp tx+ tx- tx gnd rx gnd rx- rx+ 10nf 10uf tx vcc rx vcc sff olt module 1 5 4 7 9 2 6 10 8 tx disable 100r
optoway LT-74D73D-PG ***************************************************************************************************************************************************************************** ***************************************************************************************************************************************************************************** optoway technology inc. no .3 8, 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 5 recommended circuit board layout 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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