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netlight ? NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver with cdr for intermediate reach data sheet april 2002 available in a small form-factor, metal package with lc recep- tacle connector, the NLT25-15-RA transceiver is a high-perfor- mance, cost-effective, optical transceiver for sonet/sdh applications. features multisource agreement compliant sff package lc duplex receptacle metal package for superior emi performance uncooled 1310 nm laser transmitter with automatic output power control transmitter disable input wide dynamic range receiver with ingaas pin photo detector recovered clock outputs lvttl signal detect output low power dissipation single 3.3 v power supply ac-coupled lvpecl/cml compatible data inputs and cml compatible data outputs operating temperature range of ?40 c to +85 c telecom reliability (gr-468-core rt) wave solderable and aqueous wash compatible applications sonet oc-48 ir-1, sdh s-16.1 applications description the NLT25-15-RA transceiver is a high-speed, cost- effective optical transceiver that is intended for 2.488 gbits/s shelf-to-shelf optical interconnect appli- cations, as well as sonet oc-48 ir-1 and sdh s-16.1 applications. the transceiver features the agere systems? optics and is packaged in a nar- row-width metal housing with an lc-duplex recepta- cle. the 20-pin package pinout conforms to a multisource transceiver agreement. the transmitter features the ability to interface to both lvpecl and cml differential logic level data inputs via ac-coupled inputs. the transmitter also features a lvttl logic level disable input and laser bias and backfacet monitor outputs. the receiver features ac- coupled differential cml logic level data outputs, an lvttl logic level signal-detect output, and direct access to the pin-photodetector bias input for photocurrent monitoring purposes.
2 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are abso- lute stress ratings only. functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. exposure to absolute maximum ratings for extended periods can adversely affect device reliability. table 1. absolute maximum ratings pin information figure 1. top view of the NLT25-15-RA transceiver, 20-pin configuration parameter symbol min max unit supply voltage v cc 05v operating case temperature range t c ?40 85 c storage temperature range t s ?40 85 c lead soldering temperature/time ? ? 256/10 c/s operating wavelength range 1.2 1.6 m table 2. receiver pin descriptions pin # symbol functional description logic family ms ms mounting studs. the mounting studs are provided for transceiver mechanical attachment to the circuit board. the mounting studs must be connected to the equipment chassis ground. na 1 v pd photodetector bias input . this lead supplies bias for the pin photodetector diode. na 2 v eer receiver signal ground. na 3 v eer receiver signal ground. na 4 clk? received recovered clock out. the rising edge occurs at the rising edge of the received data output. the falling edge occurs in the middle of the received data baud period. na 5 nic received recovered clock out. the falling edge occurs at the rising edge of the received data output. the rising edge occurs in the middle of the received data baud period. na 6 v eer receiver signal ground. na 7 v ccr receiver power supply. na 8 sd signal detect. normal operation: logic one output. fault condition: logic zero output. lvttl 9 rd? received data out. ac-coupled cml 10 rd+ received data out. ac-coupled cml 6 7 8 9 10 15 14 13 12 11 t x r x 1 2 3 4 5 20 19 18 17 16
3 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach pin information (continued) table 3. transmitter pin descriptions (continued) pin # symbol functional description logic family 11 v cct transmitter power supply. na 12 v eet transmitter signal ground. na 13 td is transmitter disable. lvttl 14 td+ transmitter data in. an internal 50 ? termination is pro- vided consisting of a 100 ? resistor between the td+ and td? pins. ac-coupled pecl/cml 15 td? transmitter data in . see td+ pin for terminations. ac-coupled pecl/cml 16 v eet transmitter signal ground. na 17 b mon (?) laser diode bias current monitor?negative end. optional feature. if feature is not used, do not connect. the laser bias current is accessible as a dc voltage by mea- suring the voltage developed across pins 17 and 18. na 18 b mon (+) laser diode bias current monitor?positive end . optional feature. if feature is not used, do not connect. see pin 17 description. na 19 p mon (?) laser diode optical power monitor?negative end. optional feature. if feature not used do not connect. the backface diode monitor current is accessible as a voltage proportional to the photocurrent through a 200 ? resistor between pins 19 and 20. na 20 p mon( +) laser diode optical power monitor?positive end. optional feature. if feature not used do not connect. see pin 19 description. na electrostatic discharge caution: this device is susceptible to damage as a result of electrostatic discharge (esd). take proper precautions during both han- dling and testing. follow eia ? standard eia -625. although protection circuitry is designed into the device, take proper precautions to avoid exposure to esd. agere systems employs a human-body model (hbm) for esd susceptibility testing and protection-design evaluation. esd voltage thresholds are dependent on the critical parameters used to define the model. a standard hbm (resistance = 1.5 k ? , capacitance = 100 pf) is widely used and, therefore, can be used for comparison purposes. the hbm esd threshold estab- lished for the NLT25-15-RA is 1000 v. application information the nlt receiver section is a highly sensitive fiber- optic receiver. although the data outputs are digital logic levels (cml), the device should be thought of as an analog component. when laying out system appli- cation boards, the nlt transceiver should receive the same type of consideration one would give to a sensi- tive analog component. printed-wiring board layout considerations a fiber-optic receiver employs a very high gain, wide- bandwidth transimpedance amplifier. this amplifier detects and amplifies signals that are only tens of na in amplitude when the receiver is operating near its sensi- tivity limit. any unwanted signal currents that couple into the receiver circuitry cause a decrease in the receiver's sensitivity and can also degrade the perfor- mance of the receiver's signal detect (sd) circuit.
4 4 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 application information (continued) printed-wiring board layout considerations (continued) to minimize the coupling of unwanted noise into the receiver, careful attention must be given to the printed- wiring board. at a minimum, a double-sided printed-wiring board (pwb) with a large component-side ground plane beneath the transceiver must be used. in applications that include many other high-speed devices, a multi- layer pwb is highly recommended. this permits the placement of power and ground on separate layers, which allows them to be isolated from the signal lines. multilayer construction also permits the routing of sen- sitive signal traces away from high-level, high-speed signal lines. to minimize the possibility of coupling noise into the receiver section, high-level, high-speed signals such as transmitter inputs and clock lines should be routed as far away as possible from the receiver pins. noise that couples into the receiver through the power supply pins can also degrade performance. it is recom- mended that the pi filter, shown in figure 4, be used for both the transmitter and receiver power supplies. data and signal detect outputs due to the high switching speeds of cml outputs, transmission line design must be used to interconnect components. to ensure optimum signal fidelity, both data and clock outputs should be terminated identi- cally. the signal lines connecting the data outputs to the next device should be equal in length and have matched impedances. controlled-impedance stripline or microstrip construction must be used to preserve the quality of the signal into the next component and to minimize reflections back into the receiver, which could degrade its performance. excessive ringing due to reflections caused by improperly terminated signal lines makes it difficult for the component receiving these signals to decipher the proper logic levels and can cause transitions to occur where none were intended. also, by minimizing high-frequency ringing, possible emi problems can be avoided. the signal-detect output is positive lvttl logic. a logic low at this output indicates that the optical signal into the receiver has been interrupted or that the light level has fallen below the minimum signal detect threshold. this output should not be used as an error rate indicator since its switching threshold is deter- mined only by the magnitude of the incoming optical signal. figure 2. data and clock output logic level definitions transceiver processing when the process plug is placed in the transceiver's optical port, the transceiver and plug can withstand normal wave soldering and aqueous spray cleaning processes. however, the transceiver is not hermetic, and should not be subjected to immersion in cleaning solvents. the transceiver case should not be exposed to temperatures in excess of 125 c. the transceiver pins can be wave soldered at 260 c for up to 10 sec- onds. the process plug should only be used once. after removing the process plug from the transceiver, it must not be used again as a process plug; however, if it has not been contaminated, it can be reused as a dust cover. data/clock single ended v oh v ol data /clock v oh v ol differential
5 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach transceiver optical and electrical characteristics 1. 50 ? load, measured single ended. differential operation is necessary for optimum performance. (see figure 2 for a visual represent ation.) 2. ttl compatible interface. table 4. transmitter optical and electrical characteristics (t c = ?40 c to +85 c, v cc = 3.135 v?3.465 v. all parameters must meet the specifications over the entire lifetime.) parameter symbol min max unit average optical output power p o ?5 0 dbm optical wavelength c 1266 1360 nm spectral width ? ?20 ? 1 nm side-mode suppression ratio smsr 30 ? db dynamic extinction ratio ext 8.2 ? db output optical eye compliant with sonet gr-253-core and itu-t g.957 eye mask requirements power supply current i cct ? 150 ma input data voltage?single ended 1 input data voltage?differential 1 v in p-p v in p-p 150 300 800 1600 mvp-p mvp-p transmit disable voltage 2 v d vcc ? 0.9 vcc v transmit enable voltage 2 v en v ee v ee + 0.8 v laser bias voltage v bias 0.0 0.7 v laser backfacet monitor voltage v bf 0.01 0.2 v
6 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 transceiver optical and electrical characteristics (continued) 1. 2 23 ? 1 prbs with a ber of 1 x 10 ?10 . 2. 50 ? load, measured single ended. differential operation is necessary for optimum performance. (see figure 2 for a visual represent ation.) 3. see figure 3. 4. ttl compatible interface. table 5. receiver optical and electrical characteristics (t c = ?40 c to +85 c, v cc = 3.135 v?3.465 v) parameter symbol min max unit average sensitivity 1 p i ? ?18 dbm maximum input power 1 p max 0 ? dbm power supply current i ccr ? 200 ma output data /clock voltage?single ended 2 output data/clock voltage?differential 2 v out p-p v out p-p 300 600 500 1000 mvp-p mvp-p clock duty cycle dc 45 55 % output clock random jitter j c ? 0.01 ui output clock random jitter peaking j p ? 0.1 ui clock/data alignment 3 t cda ?40 40 ps jitter tolerance/jitter transfer telcordia technologies ? gr-253-core and itu-tg.958 compliant signal-detect switching threshold assert deassert lstd lsti ?45 ?45 ?19.0 ?18.5 dbm dbm signal-detect hysteresis hys 0.5 6 db signal-detect voltage 4 low high v ol v oh 0.0 2.4 0.8 v cc v v signal-detect response time sdrt ? 100 s reflectance ? ? ?27 db
7 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach transceiver optical and electrical characteristics (continued) figure 3. clock/data alignment qualification and reliability to help ensure high product reliability and customer satisfaction, agere systems is committed to an intensive qual- ity program that starts in the design phase and proceeds through the manufacturing process. optoelectronic mod- ules are qualified to itu gr-468-core remote terminal standards, using sampling techniques consistent with telcordia technologies requirements. in addition, agere systems design, development, and manufacturing facilities have been certified to be in full com- pliance with the latest iso ? -9001 quality system standards. table 6. regulatory compliance feature test method performance laser eye safety u.s. 21 cfr (j) 1040.10 and 1040.11; iec ? 60825-1 1988, iec 60825-2 1997 cdrh compliant and class 1 laser safe. electrostatic discharge (esd) to electrical pins mil-std 883c, method 3015.4 class 1 (>1000 v) electrostatic discharge (esd) to optical connector iec 61000-4-2; 1999 withstand discharges of 15 kv using an air-discharge probe electromagnetic interference (emi) fcc part 15 subpart j class b, cispr 22: 1997; en 55022: 1998 class b, vcci class i compliant with standards. immunity iec 61000-4-3-1998 less than 1 db change in receiver sensitivity with field strength of 3 v/m rms, from 10 mhz to 1 ghz. component ul ? 1950, csa c22.2 #950, iec 60950: 1999 ? flammability ul 94 v-0 ? 50% 50% clock out data out t cda
8 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 electrical schematic * ferrite beads can be used as an option. ? for all capacitors, mlc caps are recommended. figure 4. power supply filtering for the small form factor transceiver l1 = l2 = 1 h?4.7 h* c1 = c2 = 10 nf ? c3 = 4.7 f?10 f c4 = c5 = 4.7 f?10 f receiver post- amplifier/cdr 17 18 19 20 td? td+ v eet 12, 16 15 14 preamp rd+ rd? sd v eer v cct v ccr sff transceiver 10 9 8 2, 3, 6 11 7 c4 c5 c2 c3 c1 v cc l2 l1 b mon? b mon+ p mon? p mon+ t dis 13 clk+ clk? 5 4 v pd 1 transmitter driver 3 k ? 3 k ? 10 ? 3 k ? 3 k ? 200 ? 1-968f.bx
9 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach application schematics electrical data interface?current mode logic (cml) figure 5. 3.3 v transceiver interface with 3.3 v ics and cml td+ 100 ? cml v cc (+3.3 v) v cc (+3.3 v) (a) transmitter interface?dc coupled?(cml) rd+/clk+ rd?/clk? cml v cc (+3.3 v) v cc (+3.3 v) (b) receiver interface?dc coupled?(cml) z = 50 ? z = 50 ? z = 50 ? z = 50 ? td? 1-1033f.e
10 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 application schematics (continued) alternate electrical data interface options figure 6. 3.3 v transceiver interface with 3.3 v ics td+ 100 ? lvpecl 130 ? 130 ? v cc (+3.3 v) v cc (+3.3 v) (a) transmitter interface?ac or dc coupled?(lvpecl) rd+/clk+ rd?/clk? cml v cc (+3.3 v) v cc (+3.3 v) (b) receiver interface?ac coupled?(cml) z = 50 ? z = 50 ? z = 50 ? z = 50 ? td? 0.1 f* 0.1 f* 0.1 f 0.1 f * optional ac-coupling capacitors; use ceramic x7r or equivalent. 1-1033f.e
11 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach outline diagrams package outline dimensions are in inches and (millimeters). 0.246 (6.25) 0.386 max. (9.80) 0.125 (3.18) 0.400 (10.16) 0.380 (9.66) 0.160 (4.06) 0.070 (1.78) ? 0.018 (0.46) 0.630 (16.00) 0.350 (8.90) 0.394 (10.02) 1.952 (49.58) 0.530 (13.46)
12 agere systems inc. netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 outline diagrams (continued) printed-wiring board layout dimensions are in inches and (millimeters). a 6.00 3.00 3.08 (0.121) 2.00 (0.79) (0.236) (0.118) (2x) ? 2.29 max (0.090) (2x) ? 2.29 max (0.090) (2x) ? 1.4 0.1 note 1 (0.055 0.004) area for eyelets 2.01 (0.79) 9.59 (0.378) 10.16 (0.400) 13.34 (0.525) 7.59 (0.299) 3.00 (0.118) (4x) ? 1.4 0.1 note 2 (0.055 0.004) ? 0.00 m a ? 0.00 m a 4.57 (0.180) 7.11 (0.280) 8.89 (0.350) (9x) 1.78 (0.070) 16.00 ref (0.630) 3.56 (0.140) (2x) ? 0.81 0.1 (0.032 0.004) ? 0.00 m a 1-1271(f) notes: 1. holes for mounting studs must be tied to chassis ground. 2. holes for housing leads must be tied to signal ground.
13 agere systems inc. data sheet netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver april 2002 with cdr for intermediate reach recommended panel opening dimensions in millimeters and (inches). solder post section b-b 1 a 15.24 15.75 max 15.0 min (0.62 max 0.59 min) (0.6) 14.22 0.1 (0.56 0.004) (0.039) bb 15.24 (0.6) detail a top of pcb 10.16 + 0.2 ? 0 0.4 + 0.006 ? 0
agere systems inc. reserves the right to make changes to the product(s) or information contained herein without notice. no liab ility is assumed as a result of their use or application. no liability is assumed as a result of their use or application. agere, agere systems, and the agere logo are trademarks of agere systems in c. netlight is a registered trademark of agere systems inc. copyright ? 2002 agere systems inc. all rights reserved april 2002 ds02-163metr netlight NLT25-15-RA 2.5 gbits/s 1310 nm laser transceiver data sheet with cdr for intermediate reach april 2002 for additional information, contact your agere systems account manager or the following: internet: http://www.agere.com e-mail: docmaster@agere.com n. america: agere systems inc., 555 union boulevard, room 30l-15p-ba, allentown, pa 18109-3286 1-800-372-2447 , fax 610-712-4106 (in canada: 1-800-553-2448 , fax 610-712-4106) asia: agere systems hong kong ltd., suites 3201 & 3210-12, 32/f, tower 2, the gateway, harbour city, kowloon tel. (852) 3129-2000 , fax (852) 3129-2020 china: (86) 21-5047-1212 (shanghai), (86) 10-6522-5566 (beijing), (86) 755-695-7224 (shenzhen) japan: (81) 3-5421-1600 (tokyo), korea: (82) 2-767-1850 (seoul), singapore: (65) 6778-8833 , taiwan: (886) 2-2725-5858 (taipei) europe: tel. (44) 7000 624624 , fax (44) 1344 488 045 laser safety information class i laser product all versions of the transceiver are class i laser products per cdrh, 21 cfr 1040 laser safety requirements. all versions are class i laser products per iec 60825-1:1993. caution: use of controls, adjustments, and procedures other than those specified herein may result in hazardous laser radiation exposure. this product complies with 21 cfr 1040.10 and 1040.11. wavelength = 1310 nm maximum power = 1.58 mw product is not shipped with power supply. notice unterminated optical connectors may emit laser radiation. do not view with optical instruments. ordering information eia is a registered trademark of the electronic industries association. iec is a registered trademark of the international electrotechnical commission telcordia technologies is a trademark of telcordia technologies, inc. iso is a registered trademark of the international organization for standardization. ul is a registered trademark of underwriters laboratories, inc. table 7. ordering information description device code comcode 2 x 10 singlemode sff lc receptacle transceiver with clock recovery for 2.488 gbits/s intermediate reach applications NLT25-15-RA 700010602

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