lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . features ? compliant with sff transceiver msa specification ? compliant with specifications for sonet oc - 48/sdh stm - 16 ? rj - 45 style lc tm connector system ? 1310 nm fabry - perot laser source technology ? data link up to 2km in 9/125 signal mode fiber ? single + 3.3v power supply and ttl logic interface ? 2x5 lc sff small footprint utilized in high density application ? laser class 1 product which comply with the requirements of iec 60825 - 1 and iec 60825 - 2 product description the lc - 2488b4h2 from delta electronic is a hot pluggable 3.3v small form - factor transceiver module designed expressly for high - speed bi - directional communi - cation applications that require rates of up to 2.488 gbit /sec. it is compliant with the sonet oc - 48 / sdh stm - 16 standards, as well as the sff multisource agreement. the lc - 2488b4h2 transceivers provide with the lc receptacle that is compatible with the industry standard lc connector. the transceiver is supplied in the industry standard 2x5 dip style and is footprint compatible with sff multi source agreement(msa). the transmitter section of lc - 2488b4h2 consists of an 1310 nm fabry - perot (fp) laser in an optical subassembly (osa) while the receiver consists of a gaas pin photo - diode mounted together with a transimpedance preamplifier. the post - amplifier of the lc - 2488b4h2 also includes a signal detect circuit which provides a ttl logic - high output when an unusable optical signal level is detected. the lc - 2488b4h2 transceiver is a class 1 eye safety product.the optical power levels, under normal operation, are at eye safe level. lc - 2488 b 4 h 2 x ordering information wave length a 850 nm b 1310 nm c 1550 nm sd level 4 ttl data rate link distance h 2km in 9/125 um smf i 5km in 9/125 um smf q 10km in 9/125 um smf e 200m in 62.5/125 um mmf, 500m in 50/125 um mmf f 300m in 62.5/125 um mmf, 550m in 50/125 um mmf temperature blank 0~70 deg c h -10~85 deg c t -40~85 deg c coupling type 1 dc / dc 2 ac / ac
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . absolute maximum ratings parameter symbol min. typ. max. unit note supply voltage vcc - 0..5 5 v storage temperature ts - 40 85 j lead soldering temperature t sold 240 j lead soldering time t sold 10 sec. recommended operating conditions para meter symbol min. typ. max. unit note ambient operating temperature t a 0 70 j supply voltage vcc 3.15 3.45 v transmitter differential input voltage v d 0.4 1.6 v data output load r dl 50 [ electrical characteristics (t a =0 degc to 70 degc , v cc =3.15v to 3.45v ) parameter symbol min. typ. max. unit note transmitter supply current icc 160 ma receiver supply current icc 13 0 ma data output differential voltage v d 0.5 0.7 1 .2 v output data risetime t r 150 p s ref 1 output data falltime t f 150 p s ref 1 signal detect output - high v lh 2 3.45 signal detect output - low v ll 0 0.8 notes: ref 1. these are 20%~80% values
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . optical characteristics (t a =0 degc to 70 degc , v cc =3.15v to 3.45v ) parameter symbol min. typ. max. unit note transmitter launched power(avg.) p o - 10 - 6 - 3 dbm ref 1 optical extinction ratio 8.2 db center wavelength f c 1270 1310 1355 nm spectral width(rms) m 4 nm (rms) optical risetime t r 100 ps ref 2 optical falltime t f 225 ps ref 2 receiver optical input sensitivity(avg.) p in - 18 dbm ref 3 optical input saturation(avg.) p sat - 3 dbm ref 4 optical wavelength f 131 0 nm signal detect - assert p a - 18 dbm signal detect - deassert p d - 30 dbm signal detect - hysteresis p a - p d 0.5 4 db notes: ref 1. the maximum optical output power complies with class 1 laser eye safety. ref 2. these are unfiltered 20 - 80% val ues. ref 3. the receive sensitivity is measured using a worst case extinction ratio penalty ber better than or equal to 1x10 - 12 in the center of the eye opening with 2 23 - 1 nrz prbs ref 4. measured with 2 23 - 1 nrz prbs
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . pin descriptions pin name pin# description receiver ground 1 directly connect this pin to the receiver ground plane receiver power supply 2 provide +3.3v dc via the recommended receiver power supply filter circuit. signal detect 3 receiver signal detect ttl outp ut. active high on this line indicates a received optical signal receiver output data bar 4 receiver data inverted differential ac coupled pecl compatible output receiver output data 5 receiver data non - inverted differential ac coupled pecl compatib le output transmitter power spply 6 provide +3.3v dc via the recommended transmitter power supply filter circuit. transmitter gound 7 directly connect this pin to the transmitter ground plane transmitter disable 8 connect this pin to +3.3v ttl log ic high ?1? to disable module. to enable module, connect this pin to ttl logic low ?0?. transmitter input data 9 transmitter data inverted differential ac coupled pecl compatible input transmitter input data bar 10 transmitter data non - inverted diff erential ac coupled pecl compatible input connection diagram 1 2 3 4 5 10 9 8 7 6 receiver ground receiver power supply receiver output data bar signal detect receiver output data transmitter input data bar transmitter input data transmitter disable transmitter gound transmitter power supply mounting studs / soder posts mounting studs / soder posts rx tx top view
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . recommended circuit schematic : serializer/ deserializer transceiver chip ecl/ pecl driver receiver pll etc. vcc tx+ tx- rd- rd+ vcc serdes 3.3v txgnd txd txd vccrx vcc 3.3v 100r sd rxd rxd rxgnd vcctx delta transceiver c2 c1 l2 l1 signal detect sd to upper level r12 r9 r10 r11 r6 r5 c3 1 4 5 3 2 6 10 9 7 laser driver post amp txdis ttl logic level 8 transmitter receiver pre- amp c1/2/3 = 4.7 uf l1/2 = 1 uh value of r5/6/9/10/11/12 may vary as long as proper 50 w termination or 100 w differential is provided.for good emi performance ,the power supply filter is required.use short tracks from the inductor l1/2 to the module vcctx/vccrx . nic on high off low on input level (lv - ttl) tx function table 1 (disable pin truth table)
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . sff transceiver package dimensions
lc - 2488b4h2 single mode laser small form factor transceiver for sonet oc - 48 / sdh stm - 16 d e l t a e l e c t r o n i c s , i n c . test item reference qty? evaluation (#1) electromagnetic interference emi fcc class b en 55022 class b cispr 22 5 (#2) immunity ?g radio frequency electromagnetic f ield en 61000 - 4 - 3 iec 1000 - 4 - 3 5 (#3) immunity ?g electrostatic discharge to the duplex lc receptacle en 61000 - 4 - 2 iec 1000 - 4 - 2 iec 801.2 5 (#4) electrostatic discharge to the electrical pins mil - std - 883c method 3015.4 eiaj#1988.3.2b version 2, machine model 5 (1) satisfied with electrical characteristics of product spec. ( 2 ) no physical damage regulatory compliance
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