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features ? 1300 nm single mode transceiver for links up to 15 km ? compliant with atm forum 155 mb/s physical layer specification af-phy-0046.000 ? compliant with specifica- tions proposed to ansi t1e1.2 committee for inclusion in t1.646-1995 broadband isdn and t1e1.2/96-002 sonet network to customer installation interface standards ? compliant with specifica- tions proposed to ansi t1x1.5 committee for inclusion in t1.105.06 sonet physical layer specifications standard ? multisourced 2 x 9 pin-out package style derived from 1 x 9 pin-out industry standard package style ? integral duplex sc connector receptacle compliant with tia/eia and iec standards ? laser bias monitor, power monitor and transmitter disable functions compli- ant with sonet objectives ? two temperature ranges: 0 c - + 70 c HFCT-5201b/d C40 c - + 85 c HFCT-5201a/c ? single +5 v power supply operation and pecl logic interfaces ? wave solder and aqueous wash process compatible ? manufactured in an iso 9001 certified facility ? considerable emi margin to fcc class b applications ? atm 155 mb/s links ? sonet oc3/sdh stm-1 interconnections description general the HFCT-5201 is a 1300 nm laser based transceiver. it provides a very cost-effective solution to the medium haul 155 mb/s data link requirements. 155 mb/s single mode fiber transceiver for atm, sonet oc3/sdh stm-1 technical data HFCT-5201 the new multisourced 2 x 9 footprint package style is a variation of the standard 1 x 9 package with an integral duplex sc connector receptacle. the extra row of 9 pins provides connections for laser bias and optical power monitoring as well as providing transmitter disable function. a block diagram is shown in figure 1. transmitter section the transmitter section of the HFCT-5201 consists of a 1300 nm ingaasp laser in an eyesafe optical sub-assembly (osa) which mates to the fiber cable. the laser osa is driven by a custom, silicon bipolar ic which
2 figure 2b. power monitor circuit. figure 1. block diagram. figure 2a. laser bias monitor. converts differential input pecl logic signals, ecl referenced to a +5 v supply, into an analog laser drive current. the laser bias monitor circuit is shown in figure 2a, the power monitor circuit in figure 2b. receiver section the receiver utilizes an ingaas pin photodiode mounted together with a silicon bipolar transimpedance pre-amplifier ic in an osa. this osa is connected to a silicon bipolar circuit provid- ing post-amplification quantiza- tion, and optical signal detection. the post amp circuit includes a signal detect circuit which provides a pecl logic-high output upon detection of a usable input optical signal level. signal detect is a basic fiber failure indicator. this single-ended low- power pecl output is designed to drive a standard pecl input using a 10 k w load instead of the normal 50 w pecl load. receiver signal detect as the input optical power is decreased, signal detect will switch from high to low (de- assert point) somewhere between sensitivity and the no light input level. as the input optical power is increased from very low levels, signal detect will switch back from low to high (assert point). the assert level will be at least 0.5 db higher than the de-assert level. transceiver specified for wide temperature range operation the HFCT-5201 is specified for operation over normal commer- cial temperature range of 0 to +70 c (HFCT-5201b/d) or the extended temperature range of -40 c to +85 c (HFCT-5201a/c). other members of hp 155 mb/s product family ? hfct-5205, 1300 nm single mode transceiver for links up to 15 km. the part is based on the 1 x 9 industry standard pack- age and has an integral duplex sc connector receptacle ? xmt5370-155, 1300 nm laser- based transmitter in pigtailed package for 2 km and 15 km links with smf cables ? xmt5170-155, 1300 nm laser- based transmitter in pigtailed package for 40 km links with smf cables ? rcv1201d-155, receiver in pigtailed package for 2 km, 15 km and 40 km links with smf cables. v cc laser ac 30 r 10 r 3 k w 3 k w laser dc bias l mon (+) pin 6 pin 5 l mon (? v cc power monitor pin 9 (ref to v ee ) 30 k w v ref 1.2 v 3 k w v ee signal detect electrical subassembly post amplifier ic laser driver ic top view pin photodiode duplex sc receptacle laser pre- amplifier ic data data optical sub- assemblies data power monitor laser bias monitor data
3 applications information typical ber performance of receiver versus input optical power level the HFCT-5201 transceiver can be operated at bit-error-rate conditions other than the required ber = 1 x 10 -10 of the atm forum 155.52 mb/s physical layer standard. the typical trade- off of ber versus relative input optical power is shown in figure 3. the relative input optical power in db is referenced to the input optical power parameter value in the receiver optical characteristics table. for ber conditions better than 1 x 10 -10 , more input signal is needed (+db). recommended circuit schematic in order to ensure proper functionality of the HFCT-5201 a recommended circuit is provided in figure 4. when designing the circuit interface, there are a few fundamental guidelines to follow. for example, in the recom- mended circuit schematic figure the differential data lines should be treated as 50 ohm microstrip or stripline transmission lines. this will help to minimize the parasitic inductance and capacitance effects. proper termination of the differential data signals will prevent reflec- tions and ringing which would compromise the signal fidelity and generate unwanted electrical noise. locate termination at the received signal end of the transmission line. the length of these lines should be kept short and of equal length. for the high speed signal lines, differential signals should be used, not single-ended signals, and these differential signals need to be loaded symmetrically to prevent unbalanced currents from flowing which will cause distortion in the signal. maintain a solid, low inductance ground plane for returning signal currents to the power supply. multi-layer plane printed circuit board is best for distribution of v cc , returning ground currents, forming transmission lines and shielding. also, it is important to suppress noise from influencing the fiber-optic transceiver performance, especially the receiver circuit. proper power supply filtering of v cc for this transceiver is accomplished by figure 3. relative input optical powerCdbm avg. figure 4. recommended circuit schematic. bit error ratio -5 3 10 -2 relative input optical power ?dbm avg. -3 1 -2 0 10 -4 10 -6 10 -8 10 -10 10 -11 10 -12 10 -7 10 -5 10 -3 -4 -1 2 10 -9 10 -13 10 -14 10 -15 linear extrapolation of 10 -4 through 10 -7 data points actual data points locate filter at v cc pins r7 r6 r8 v cc c3 c4 l1 l2 c1 c2 r1 r4 c5 r3 r2 v cc terminate at fiber-optic transceiver inputs terminate at the device inputs c8 r5 c6 1 nc 23 nc 4 nc 5 l mon (-) 6 l mon (+) 7 tx dis 8 nc 9 p mon 18 17 rd 16 rd 15 sd 14 13 12 td 11 td 10 rx v ee rx v cc tx v cc tx v ee top view no internal connection no internal connection notes: the split-load terminations for pecl signals need to be located at the input of devices receiving those pecl signals. r1 = r4 = r6 = r8 = 130 w . r2 = r3 = r5 = r7 = 82 w . r15 = 10 k. c1 = c2 = c3 = c5 = c6 = 0.1 ?. c4 = c8 = 10 ?. l1 = l2 = 1 ? coil. rd rd sd v cc td td rx tx nc r15
4 using the recommended, separate filter circuits shown in figure 4, the recommended circuit schematic diagram for the transmitter and receiver sections. these filter circuits suppress v cc noise of 50 mv peak-to-peak or less over a broad frequency range. this prevents receiver sensitivity degradation due to v cc noise. it is recommended that surface-mount components be used. use tantalum capacitors for the 10 m f capacitors and monolithic, ceramic bypass capacitors for the 0.1 m f capacitors. also, it is recom- mended that a surface-mount coil inductor of 1 m h be used. ferrite beads can be used to replace the coil inductors when using quieter v cc supplies, but a coil inductor is recommended over a ferrite bead. coils with a low, series dc resistance (<0.7 ohms) and high, self-resonating frequency are recommended. all power supply components need to be placed physically next to the v cc pins of the receiver and transmitter. use a good, uniform ground plane with a minimum number of holes to provide a low-inductance ground current return for the power supply currents. in addition to these recommenda- tions, hewlett-packards applica- tion engineering staff is available for consulting on best layout practices with various vendors mux/demux, clock generator and clock recovery circuits. hp has participated in several reference design studies and is prepared to share the findings of these studies with interested customers. contact your local hp sales representative to arrange for this service. evaluation circuit boards evaluation circuit boards implementing this recommended circuit design are available from hewlett-packards application engineering staff. contact your local hp sales representative to arrange for access to one if needed. operation in -5.2 v designs for applications that require -5.2 v dc power supply level for true ecl logic circuits, the HFCT-5201 transceiver can be operated with a v cc = 0 v dc and a v ee = -5.2 v dc. this transceiver is not specified with an operating, negative power supply voltage. the potential compromises that can occur with use of -5.2 v dc power are that the absolute voltage states for v oh and v ol will be changed slightly due to the 0.2 v differ- ence in supply levels. also, noise immunity may be compromised for the HFCT-5201 transceiver because the ground plane is now the v cc supply point. the suggested power supply filter circuit shown in figure 4, recommended circuit schematic, should be located in the v ee paths at the transceiver supply pins. direct coupling of the differential data signals can be done between the HFCT-5201 transceiver and the standard ecl circuits. for guaranteed -5.2 v dc operation, contact your local hewlett-packard field sales engineer for assistance. recommended solder and wash process the HFCT-5201 is compatible with industry standard wave or hand solder processes. HFCT-5201 process plug the HFCT-5201 transceiver is supplied with a process plug for protection of the optical ports with the duplex sc connector receptacle. this process plug prevents contamination during wave solder and aqueous rinse as well as during handling, shipping or storage. it is made of high- temperature, molded, sealing material that will withstand +80 c and a rinse pressure of 50 lb/in 2 . recommended solder fluxes and cleaning/degreasing chemicals solder fluxes used with the HFCT-5201 fiber-optic transceiver should be water- soluble, organic solder fluxes. some recommended solder fluxes are lonco 3355-11 from london chemical west, inc. of burbank, ca, and 100 flux from alpha- metals of jersey city, n.j. recommended cleaning and degreasing chemicals for the HFCT-5201 are alcohols (methyl, isopropyl, isobutyl), aliphatics (hexane, heptane) and other chemicals, such as soap solution or naphtha. do not use partially halogenated hydro-carbons for cleaning/degreasing. examples of chemicals to avoid are 1.1.1. trichloroethane, ketones (such as mek), acetone, chloroform, ethyl acetate, methylene dichloride, phenol, methylene chloride or n-methylpyrolldone. regulatory compliance the HFCT-5201 is intended to enable commercial system designers to develop equipment that complies with the various regulations governing certifica- tion of information technology
5 figure 5. recommended board layout hole pattern. equipment. see the regulatory compliance table 1 for details. additional information is available from your hewlett- packard sales representative. electrostatic discharge (esd) there are two design cases in which immunity to esd damage is important. the first case is during handling of the transceiver prior to mounting it on the circuit board. it is important to use normal esd handling precautions for esd sensitive devices. these precau- tions include using grounded wrist straps, work benches, and floor mats in esd controlled areas. the second case to consider is static discharges to the exterior of the equipment chassis containing the transceiver parts. to the extent that the duplex sc connector is exposed to the outside of the equipment chassis it may be subject to whatever esd system level test criteria that the equipment is intended to meet. electromagnetic interference (emi) most equipment designs utilizing these high-speed transceivers from hewlett-packard will be required to meet the require- ments of fcc in the united states, cenelec en55022 (cispr 22) in europe and vcci in japan. the HFCT-5201 has been characterized without a chassis enclosure to demonstrate the robustness of the parts integral shielding. performance of a system containing these transceivers within a well d b e top view c a f dim. millimeters inches min. typ. max. min. typ. max. 1.8 0.7 20.32 33.02 2.54 2.54 2.0 0.9 0.071 0.027 0.8 1.3 0.1 0.1 0.079 0.035 a b c d e f
6 figure 6. package outline drawing and pinout. dim. millimeters inches min. typ. max. min. typ. max. 12.70 0.75 3.30 12.70 20.32 52.02 25.40 11.1 10.35 0.500 0.030 0.130 0.500 0.800 2.048 1.000 0.437 0.407 a b c d e f g h j dim. millimeters inches min. typ. max. min. typ. max. 0.46 1.27 2.54 3.12 2.54 33.02 15.88 20.32 0.53 1.32 0.018 0.050 0.100 0.123 0.100 1.300 0.625 0.800 0.021 0.052 k ? l m n p q ? r s h d g j s ? l (18 x) note 1 n p q note 1: solder posts and electrical pins are tin/lead plated. f ref. e m ref. k typ. 8 pls ? r (2 x) note 1 18 = v eer 17 = rd 16 = rd 15 = sd 14 = v ccr 13 = v cct 12 = td 11 = td+ 10 = v eet top view n/c n/c 1 = n/c 2 = n/c 3 = n/c 4 = n/c 5 = l mon (? 6 = l mon (+) 7 = tx dis 8 = n/c 9 = p mon rx tx c a b area reserved for process plug
7 table 1. regulatory complianceCtypical performance feature test method performance electrostatic discharge mil-std-883c class 1 (>1000 v) (esd to the electrical pins) method 3015.4 electrostatic discharge variation of products of this design typically withstand at least (esd) to the duplex sc iec 801-2 25 kv without damage when the duplex sc receptacle connector receptacle is contacted by a human body model probe. electromagnetic fcc class b typically provide 11 db margin to fcc class b interference (emi) cenelec en55022 when tested at a certified test range with the class b (cispr 22b) transceiver mounted to a circuit card without a vcci class 2 chassis enclosure at frequencies up to 1 ghz. margins above 1 ghz are dependent on customer board and chassis designs. immunity variation of typically show no measurable effect from a 10 v/m iec 801-3 field swept from 27 mhz to 1 ghz applied to the transceiver when mounted to a circuit card without a chassis enclosure. eye safety iec 825 license pending. cdrh class 1 license pending. designed chassis is expected to be better than the results of these tests with no chassis enclosure. immunity equipment utilizing these hfct- 5201 transceivers will be subject to radio-frequency electromagnetic fields in some environments. these transceiv- ers, with their integral shields, have been characterized without the benefit of a normal equip- ment chassis enclosure and the results are reported below. performance of a system containing these transceivers within a well-designed chassis is expected to be better than the results of these tests without a chassis enclosure.
8 operating environment parameter symbol minimum maximum units power supply voltage ecl operation v cc C4.95 C5.45 v power supply voltage pecl operation v cc +4.75 +5.25 v ambient operating temperature t op C40 +85 c HFCT-5201a/c ambient operating temperature t op 0 +70 c HFCT-5201b/d transmitter section (ambient operating temperature, v cc = 4.75 v to 5.25 v) parameter symbol minimum typical maximum units notes output center wavelength l ce 1260 C 1360 nm C output spectral width (rms) dl C 7.7 C nm C average optical output power p o C15 C C8 dbm 1 extinction ratio e r C 8.2 C db C bias monitor C C 0.1 C ma/mv 3 rear facet monitor C C v ee + 1.2 C v C tx disable t xdis v cc C 3.2 C v cc vC power supply current i cc C 140 C ma 2 output eye compliant with bellcore tr-nwt-000253 and itu recommendation g.957 performance specifications absolute maximum ratings parameter symbol minimum maximum units storage temperature t s C40 +85 c operating temperature HFCT-5201a/c C C40 +85 c operating temperature HFCT-5201b/d C 0 +70 c lead soldering temperature/time C C +240/10 c/s output current (other outputs) i out 030ma input voltage C gnd v cc v power supply voltage C 0 +6 v
9 receiver section (ambient operating temperature, v cc = 4.75 v to 5.25 v) parameter symbol minimum typical maximum units notes receiver sensitivity C C31 C C dbm 4 maximum input power C C7 C C dbm C alarm on C C43 C C31 dbm C hysteresis C 0.5 C 4.0 db C power supply current i cc C C 100 ma 5 data outputs ecl/pecl alarm output ecl/pecl notes: 1. output power is power coupled into a single mode fiber. 2. the power supply current varies with temperature. maximum current is specified at v cc = maximum at maximum temperature (not including terminations) and end of life. 3. common mode signal 2.5 v nominal. 4. minimum sensitivity and saturation levels for a 2 23 -1 prbs with 72 ones and 72 zeros inserted. (itu recommendation g.958). 5. the current excludes the output load current.
10 table 2. pin out table pin symbol functional description mounting studs the mounting studs are provided for transceiver mechanical attachment to the circuit board. they are embedded in the nonconductive plastic housing and are not connected to the transceiver internal circuit. they should be soldered into plated-through holes on the printed circuit board. 1 n/c 2 n/c 3 n/c 4 n/c 5l mon (C) laser bias monitor (C) this analog current is monitored by measuring the voltage drop across a 10 ohm resistor placed between high impedance resistors connected to pins 5 and 6 internal to the transceiver. 6l mon (+) laser bias monitor (+) this analog current is monitored by measuring the voltage drop across a 10 ohm resistor placed between high impedance resistors connected to pins 5 and 6 internal to the transceiver. 7tx dis transmitter disable transmitter output disabled: v cct C 1.5 v v 7 v cct . transmitter output uncertain: v cct C 4.2 v v 7 v cct C 1.5 v. transmitter output enabled: v eet v 7 v cct - 4.2 v or open circuit. 8 n/c 9p mon power monitor the analog voltage measured at this high impedance output provides an indication of whether the optical power output of the laser diode is operating within the normal specified power output range per the following relationships: high light indication: v 9 3 v eet + 1.7 v. normal operation: v 9 @ v eet + 1.2 v. low light indication: v 9 v eet + 0.7 v. 10 v eet transmitter signal ground directly connect this pin to the transmitter signal ground plane. 11 td+ transmitter data in terminate this high-speed, differential transmitter data input with standard pecl techniques at the transmitter input pin. 12 tdC transmitter data in bar terminate this high-speed, differential transmitter data input with standard pecl techniques at the transmitter input pin. 13 v cct transmitter power supply provide +5 v dc via the recommended transmitter power supply filter circuit. locate the power supply filter circuit as close as possible to the v cct pin. 14 v ccr receiver power supply provide +5 v dc via the recommended receiver power supply filter circuit. locate the power supply filter circuit as close as possible to the v ccr pin.
11 table 2. pin out table (continued) pin symbol functional description 15 sd signal detect normal input optical levels to the receiver result in a logic 1 output. low input optical levels to the receiver result in a fault indication shown by a logic 0 output. signal detect is a single-ended, low-power, pecl output. this output requires a 10 k termination resistor to v ee to achieve pecl output levels. this signal detect output can be used to drive a pecl input on an upstream circuit, such as, signal detect input and loss of signal-bar input. 16 rdC receiver data out bar terminate this high-speed, differential, pecl output with standard pecl techniques at the follow-on device input pin. 17 rd+ receiver data out terminatethis high-speed, differential, pecl output with standard pecl techniques at the follow-on device input pin. 18 v eer receiver signal ground directly connect this pin to receiver signal ground plane.
ordering information HFCT-5201 x a = C40 c to +85 c black case b = 0 to +70 c black case c = C40 c to +85 c blue case d = 0 to +70 c blue case recommended part numbers: HFCT-5201c HFCT-5201d for technical assistance or the location of your nearest hewlett-packard sales office, distributor or representative call: americas/canada: 1-800-235-0312 or 408-654-8675 far east/australasia: call your local hp sales office. japan: (81 3) 3335-8152 europe: call your local hp sales office. data subject to change. copyright ? 1997 hewlett-packard co. obsolete: 5966-0626e printed in u.s.a. 5966-1881e (11/97) www.hp.com/go/fiber

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