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2488 mb/s single mode fiber transceiver for sonet oc-48/sdh stm-16 and atm technical data HFCT-5402D features ? 1300 nm single mode transceiver for sonet/sdh short reach links compliant with proposed atm forum 2488 mb/s physical layer specification compliant with sonet jitter tolerance and generation specifications integral duplex sc connector receptacle compliant with tia/eia and iec standards incorporates agilent?s eyesafe laser subassembly single +5 v power supply operation integral pll based clock recovery circuit provides regenerated differential clock and data outputs (cml) transmitter disable function temperature range: 0c - +70c wave solder and aqueous wash process compatible manufactured in an iso 9001 certified facility uncooled dfb version to be released shortly for 15 km ir links applications atm 2488 mb/s links sonet oc-48/sdh stm-16 interconnections description general the HFCT-5402D is a 1300 nm laser-based duplex sc receptacle 2 x 9 transceiver with integral clock and data recovery circuits. it provides a cost-effective solution for short haul 2488 mb/s data link requirements. this compact transceiver requires a single +5 v source and contains the following features as depicted in figure 1: differential data input, differential retimed data output, differential recovered clock output, laser bias monitor, signal detect and transmitter disable. transmitter section the transmitter section of the HFCT-5402D is similar to 1300 nm single mode transceivers in use at the 155 and 622 mb/s rate. it consists of a 1300 nm ingaasp laser in an eye-safe optical subassembly (osa) which mates to the fiber cable. the laser osa is driven by a custom, silicon bipolar ic which converts differential input pecl logic signal into an analog laser drive current. receiver section the receiver section of the transceiver provides a full set of features including an integral clock and data recovery (cdr) circuit together with signal detect function. the receiver utilizes an ingaas pin photodiode mounted together with a transimpedance preamplifier ic. this is connected to custom silicon circuits providing post-amplification and quantization, cdr function and signal detection.
2 cdr function in normal operation, the cdr data loop is able to acquire and maintain bit lock with the use of the external reference clock. the recovered clock is used to re-time the quantizer data output, which completes the full cdr function. the relative timing relationship between the output retimed data and the recovered clock signals is shown graphically in figure 2. the voltage swing measurement method is also shown for clock and data outputs. for input optical power greater than the specified receiver sensitivity of -18.5 dbm, the bit-error-ratio will be better than 1 x 10 -10 . the sd (signal detect) will be deasserted when loss of optical signal occurs. reference clock with ?intermittent? or ?no data condition? the output clock will slowly drift away from the 2.48832 ghz. the reference clock figure 1. block diagram enables the vcxo to acquire and maintain lock. ref clk input is self biasing and 50 input terminated. temperature range the HFCT-5402D is specified for operation over normal commercial temperature range of 0 to +70c with recommended metal shield figure 2a. relative timing relationship between output retimed data and recovered clock signals in place (see figure 3) and with 2 m/s forced airflow around the transceiver. in the event a 2 m/s airflow is not available due to chassis restrictions, high temperature operation will be limited to +60c. electrical subassembly data clock signal detect clock & data recovery and post amplifier ic laser driver ic pre- amplifier ic laser pin photodiode duplex sc receptacle top view clock data transmit disable laser bias monitor + data +v cct ref clk data +v ccr 100 nf 1 nf laser bias monitor - 100 w v ee figure 2b. logic voltage values baud interval clock period rd rd clk clk 80 ps v oh v ol v oh v ol v oh v ol v oh v ol data in/out v p-p - single ended differential clock out v p-p differential
3 figure 3. emc diffuser shield for HFCT-5402D transceiver (mounted inboard) application information transmitter section the HFCT-5402D transmitter section comprises agilent?s proprietary high speed silicon bipolar laser driver ic and multi- quantum well (mqw) laser diode housed in an eye-safe optical subassembly. the input stage accepts pecl level signals and converts this to analog laser drive current. the laser driver ic provides both laser bias and modulation current control enabling a physically compact transmitter section. the nonlinear characteristics of laser threshold and bias points over operating temperature range utilizes sophisticated extinction ratio control circuitry. the agilent laser driver ic deploys a tri- gradient approximation methodology and allows good power and extinction ratio control. figure 4 illustrates the sections of the laser driver ic. notes: - dimensions in mm, datums to pin 1 of module - shield is nickel-silver ns106 h/h. thickness 0.200 - 0.260 mm - recommend maximizing the area of v ee under the module. 28.5 15.4 11.4 tx rx 54.18 10.0 10.0 10.0 10.0 suggested hatched area to be free from solder mask. 24.285 0.160 10.0 10.0 3.965 component free area on pcb 38.5 ? 1.0 17 places 0.790 10.0 9.035 11.285 0.426 56 to 60 2 to 3 4.165
4 data data disable laser modulator laser bias driver laser bias control laser laser bias monitor photodiode (rear facet monitor) 100 r pin 11 pin 12 pin 7 figure 4. transmitter diagram electrical characteristics transmitter section input stage the input stage is internally biased and 50 ohm terminated. the transmitter accepts either single- ended or differential pecl inputs with signal levels ranging from 200 mv to 1100 mv swing. it is important to ensure data input lines have a 50 ohm characteristic impedance for optimum performance. laser bias monitor the laser bias monitor points (pins 5 and 6) allow the user to directly measure dc bias current (see figure 5). the i/v relation- ship for laser bias current is: i bias = [(v 6 - v 5 )/10] a it is worth noting that the above relationship yields total laser forward current (threshold and bias) when no data is applied and approximately threshold current when modulation is applied. this monitoring facility allows the user to identify eol conditions in a given application. figure 6 shows a circuit which can be used for indicating high bias current conditions. pins 5 and 6 are connected to the inverting and non-inverting inputs of ic1a respectively. ic1a is configured as a unity gain buffer and its output (v ic1a ) fed to ic1b. ic2 provides a fixed 1.25 v reference to vr1 which allows fine adjustment for setting the threshold voltage (v th ) at ic1b which is configured as a ttl comparator. the voltage v th at ic1b?s inverting input determines the level at which the high bias conditions results in a ttl flag. for end of life indication, a typical voltage setting for v th is: 3*(v ic1a at +25c, no input data modulation) for operation between +25c - +70c 1.5*(v ic1a at +25c, no input data modulation) for operation between 0 - +25c these ratios are approximate and represent a coarse eol indicator when used in conjunction with the circuit shown. figure 5. bias monitor figure 6. laser bias indicator circuit lmc6062 + - r1 3 k r2 3 k ic1a v cc +5 v lmc6062 + - ic1b v cc +5 v r4 1 m r3 1 k r5 1 k 10 k vr1 v cc +5 v lm385 1.25 v ic2 v ic1a v th ttl output (high = eol) pin 6 (+) pin 5 (-) 3 k w pin 6 (+) pin 5 (-) v cc 10 r 3 k w v ee
5 transmitter disable the transmitter can be disabled by connecting pin 7 to the appropriate voltage (v7 > 4 v). in normal operation (transmitter enabled), no external connection is required. transmitter jitter generation the jitter generation requirements for sonet/sdh transport systems are: 100 m ui pk - pk (sonet) 10 m ui rms (sonet/sdh) typical jitter generation performance for the HFCT-5402D is: 60 m ui pk - pk 6 m ui rms. figure 7 shows the experimental configuration used to test jitter generation. an hp70841b pattern generator is used to generate ecl data at 2.48832 gb/s to modulate the transmitter. jitter generation is measured using a sonet sts48 2 -23 prbs scrambled pattern. the optical output of the transmitter is attenuated and fed into the receiver of the omniber 718a at an input sensitivity of -14 dbm. figure 7. jitter generation test configuration. pattern generator hp70841b rx HFCT-5402D differential ecl data omniber 718a attenuator input optical power -14 dbm independent sonet pattern to stimulate rx. tx
6 receiver receptacle transimpedance preamplifier postamp pll clock recovery and signal detector ic data out data out clock out clock out sd ref clk figure 8. receiver block diagram figure 9. reference clock rise and fall times versus amplitude receiver section reference clock the clock and data regeneration function is designed such that a reference clock running at 1/128th the data rate is required to acquire and maintain lock. operation at other clock frequencies in the vicinity of 2.488 ghz are possible by using different crystal oscillators having 1/128th the frequency of interest. (for 2488 mb/s operation a 19.44 mhz clock is required). figure 8 illustrates the receiver operation. inputs fed to the reference clock (pin 1) require 100 nf ac coupling and need 100 ppm frequency accuracy. clock outputs are maintained at 2.48832 ghz throughout the dynamic range of the receiver up to the threshold of signal detect. in the absence of input optical data, the transceiver clock will vary within 1000 ppm of the clock frequency. all development and characterization work have been performed with a pecl 19.44 mhz clock oscillator part number oso-sfe-b00c obtained from onspec (www.onspec.co.uk). figure 9 shows the rise time and amplitude requirements for the reference clock input. various combinations of rise times and amplitudes allow the user a degree of freedom in selecting clock sources. 2 3 4 5 6 7 8 0 100 200 300 400 500 600 700 800 900 reference clock amplitude (mvpp) rise/fall time (ns) acceptable time/amplitude combinations
7 output terminations the receiver data and clock outputs provide current mode logic (cml) levels. these outputs are internally ac coupled with 0.1 uf capacitors. typical output swings are in the order of 350 mv for data and 300 mv for clock. figures 10 and 11 show typical data and clock waveforms. it is recommended that the receiver outputs are connected to 50 ohm transmission lines. interfacing with ecl/pecl input stages is possible provided that input sensitivities will accommodate minimum voltage swings of 200 mv pk-pk. signal detect the signal detect function is provided via a single-ended output and offers low power ttl capability. interfacing this node to other stages requires a high impedance input typically in the order of 10 k ohms. low input impedance stages are unsuitable. this node may be left unconnected if not used. hysteresis for the signal detect function is typically 0.1 db. figure 12 shows a circuit that is recommended for interfacing the +5 v ttl sd output into a +3.3 v lvpecl input. the sd node comprises a pnp transistor with a collector resistance of 4.7 k. figure 10. typical receiver data output 2488 mb/s. figure 11. typical receiver clock output 2488 mhz. figure 12. cdr ic 4.7 k hfct-5404d 16 k +5 v sd lvpecl input 20 k +3.3 v 27 k
8 jitter parameters the HFCT-5402D transceiver design fulfills the jitter generation and tolerance requirements for sonet and sdh. figure 13 shows typical jitter tolerance performance. jitter transfer performance does not conform to sonet/sdh requirements due to a slightly higher cutoff frequency. however, in-band jitter transfer performance has no peaking. typical jitter transfer performance is shown on figure 14. reflectance it is recommended that an 8 angle polished sc connector be used in conjunction with the hfct-5402 in order to fulfill the reflectance requirements as per itu-g957 and bellcore gr-253-core. optical reflection on the rx side of the transceiver is primarily contributed by the glass air interface of the sc connector ferrule. an angle polished connector for such an interface reduces the incidental refection. receiver operating wavelength the HFCT-5402D receiver is specified for operation over a range of wavelengths from 1270 nm to 1570 nm. figure 15 shows the typical dc responsivity curve of an ingasas pin photodiode. figure 13. typical receiver jitter tolerance figure 14. typical receiver jitter transfer
9 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 wavelength (nm) responsivity (a/w) figure 15. typical dc responsivity of an ingasas pin photodiode figure 16. filter network for power supply noise reduction power supply filtering good power supply filtering is required for optimum receiver performance. the lc filtering technique illustrated in figure 16 is recommended for the user. this configuration of filtering arrangement is adopted for the HFCT-5402D evaluation board. figure 17 shows the noise rejection response for such an configuration. additional information is provided in figure 18 to show noise rejection when the series inductor value is increased to 47 uh. using an intermediate value of series inductance allows the designer to balance physical size, ohmic resistance (and hence voltage drop) and filtering capability to suit application needs. 100 nf filtered v ccr to pin 14 v ccr v ee 10 uh 100 nf 10 uf + 0.01 0.1 1 10 1.00e+00 1.00e+01 1.00e+02 1.00e+03 1.00e+04 1.00e+05 1.00e+06 1.00e+07 frequency (hz) noise amplitude (vpp) figure 17. power supply noise rejection with 10 uh inductor(-1 db receiver sensitivity)
10 0.01 0.1 1 10 1.00e+00 1.00e+01 1.00e+02 1.00e+03 1.00e+04 1.00e+05 1.00e+06 1.00e+07 frequency (hz) noise amplitude (vpp) evaluation board an evaluation board (hfct-5001) is available for easy use and demonstration of transceiver performance. the evaluation board is shown in figure 19 and provides a physical platform for the device under test and offers facilities for +5 v dc power supply connections, tx data inputs, signal detect, rx data/clock outputs, clock reference input, tx disable switch and recommended power supply filtering. the evaluation board also provides a 19.44 mhz crystal oscillator which is powered by the +5 v dc voltage supply. the output of this unit is connected to the clock reference input of the first transceiver and allows the hfct- 5402d to operate at 2.488 gb/s data rate. optionally, a separate clock source can be fed to the first board if a different frequency is required. it is possible to operate the hfct- 5402d between 622 mb/s to 2.66 gb/s. however, full performance characterization has only been performed at 2.488 gb/s line rate. figure 18. power supply noise rejection with 47 uh inductor (-1 db receiver sensitivity) the circuit schematic for the evaluation board is shown in figure 20. figure 19. hfct-5001 evaluation board
11 1 jp4 1 jp9 c3 100 n v ccr v ccr v ee l1 10 uh c4 100 n c9 10 uf + c2 100 n jp1 1 v ee td+ td- v cct v ccr sd rd- rd+ v ee u1 HFCT-5402D v cct jp7 c12 not fitted jp11 1 1 jp12 1 jp13 sw1 sw-spdt r1 510 r v cct r2 3k6 led1 v cc 1 o/p 7 gnd 8 nc 14 co1 pecl oscillator c13 in c11 10 uf 1 jp16 v cc _ck l3 10 uh v cc _ck td sd rd clk ref clk dnc l mon (+) l mon (-) ber signal r3 510 r 50 ohm test track td c1 100 n jp2 jp17 jp18 v ccr jp3 rd 10 11 12 13 14 15 16 17 18 9 8 7 6 5 4 3 2 1 dnc v ee t dis l mon+ l mon- clk+ clk- v ee ref clk jp10 clk jp8 + c7 100 n jp5 jp6 c8 100 n 1 jp15 c5 100 n v cct v cct l2 10 uh c6 100 n c10 10 uf + figure 20. circuit schematic for the evaluation board application considerations pcb layout like all rf applications, the pcb design and layout for this high speed transceiver requires careful consideration and attention towards interconnect impedances for data and clock nodes. any form of power supply filtering or decoupling should be done as close as possible to the power supply pins to minimize radiated or conductive pickup. it is recommended that high speed data and clock tracks be buried striplines to minimize exposure of these lines for emi suppression. also, such an approach will ensure signal integrity and avoid waveform degradation from rf interference. plated through holes or vias used should be as small as possible to avoid impedance discontinuities along interconnecting tracks. where ac coupling capacitors are required, small 0603 size components are recommended for minimizing variations in track impedances.
12 emi radiation/susceptibility emi suppression becomes increasingly difficult when operating at high data rates. emi radiation measurements performed to date indicate the need to use external shielding in order to meet fcc class a chassis emissions requirements. the recommended metal shield for the transceiver is shown in figure 3. the shield requires good connection to signal ground for effective suppression. the typical emission peaks are at ~2.5 ghz and ~7.5 ghz. it is recommended that the user adopts an approach where the transceiver module is sited within the chassis/rack confines and a short patchcord used to link the transceiver to the optical interface in the front panel. front panel mounting is not recommended due to the aperture size required which will not be sufficiently suppressive for frequencies above 7.5 ghz. metal bodied simplex/single sc adaptors are recommended for the front panel. this body type is preferred to the all plastic version because it presents a reduced aperture for improved emissions suppression. duplex sc adaptors are not recommended as the larger aperture required for front panel mounting may allow high frequency radiation. emi susceptibility has been tested to 10 v/m field strength with minimal degradation of receiver sensitivity. compatibility trials the HFCT-5402D transceiver has been evaluated using vitesse semiconductors vs8004 and vs8005 mux/demux chipsets and compatibility has been confirmed with a 9 db margin of electrical attenuation between the HFCT-5402D module and the vs8005 demux inputs. figure 21 shows the test configuration. an additional demux is deployed between the pattern generator and the mux to avoid the need for multiple pattern generators. also, a 3 db electrical attenuator is required at the transmitter inputs to prevent the 1.2 v p-p mux data signal from overloading the tx inputs of the HFCT-5402D module. compatibility trials have also been successful using the vsc8062 and vsc8063 chipsets. a joint reference design combining both the agilent HFCT-5402D transceiver and amcc mux s3041/ demux s3042 ics on a common pc board has been completed and good performance achieved. the aim of this exercise was to design a functional board with a view of sharing relevant layout and circuit information with the optics system designer. figure 22 shows the reference design board. full description of the design, layout, measurements and results are beyond the scope of this document but a separate document is available. please contact your agilent representative for further information. recommended solder and wash process the HFCT-5402D is compatible with industry standard wave or hand solder processes. HFCT-5402D process plug the HFCT-5402D 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 +80c and a rinse pressure of 50 lb/in 2 . recommended solder fluxes and cleaning/degreasing chemicals solder fluxes used with the HFCT-5402D 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, nj. recommended cleaning and degreasing chemicals for the HFCT-5402D are alcohol?s (methyl, isopropyl, isobutyl), aliphatics (hexane, heptane) and other chemicals, such as soap solution or naphtha. do not use partially halogenated hydrocarbons 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-5402D is intended to enable commercial system designers to develop equipment that complies with the various regulations governing certification of information technology equipment. additional information is available from your agilent sales representative.
13 pattern generator hp70841b clk data clk data clk data vs8005 demux 50 w nskip = +2 v skip = - 3.2 v vs8004 mux clk clk 4 clk 4 clk data clk 4 clk 4 nclk data data error detector hp70842b clock in data in clk 4 nclk 4 data all other outputs 50 w demux data data clk clk skip nskip clk clk ref clk data data rx td td tx 3 db 3 db scope hp83480a attenuator ref clk trig 50 w 50 w 50 w 50 w HFCT-5402D 4 x 622 mb/s 2.488 ghz 2.488 gb/s v ee - 3.2 v v cc +2 v 622 mhz 1 x 622 mb/s v cc +2 v v ee - 3.2 v 2.488 gb/s 2.488 gb/s in evaluation board hp8157a optical figure 21. test configuration
14 electrostatic discharge (esd) normal esd handling precautions for esd sensitive devices should be followed while using the HFCT-5402D. these precautions include using grounded wrist straps, work benches and floor mats in esd controlled areas. additionally, static discharges to the exterior of the equipment chassis containing the transceiver parts must also be considered. if 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. figure 22. reference design board electromagnetic interference (emi) most equipment designs utilizing these high-speed transceivers from agilent will be required to meet the requirements of fcc in the united states, cenelec en55022 (cispr 22) in europe and vcci in japan. the HFCT-5402D is designed to meet such emi requirements when used with a recommended shield and positioned inside a well designed chassis. additionally, an sc duplex jumper cable is recommended for connecting the transceiver to front panel simplex sc optical ports in order to minimize chassis apertures. eye safety tuv certification 933/510804 and cdrh accession 9521220-15 show that the HFCT-5402D is a iec 825/cdrh class 1 laser product. copies available on request. qualification the HFCT-5402D transceivers have been successfully qualified in accordance with the requirements of bellcore document ta-nwt-000983, under the supervision of agilent quality and reliability engineering.
15 figure 23. package outline drawing and pinout 12.70 (0.50) 11.10 (0.437) max. 10.35 (0.407) max. 0.75 (0.03) 3.30 (0.13) ff 18 = v ee ff 17 = rd ff 16 = rd- ff 15 = sd ff 14 = v ccr ff 13 = v cct ff 12 = td- ff 11 = td+ ff 10 = v ee ref clk = v ee = clk- = clk+ = l mon (-) = l mon (+) = tx dis = v ee = dnc = rx tx n/c n/c top view 1 2 3 4 5 6 7 8 9 component free area of pcb 52.02 (2.048) max. 38.00 (1.50) 25.40 (1.00) max. notes 1: solder posts and electrical pins are tin/lead plated. notes 2: solder posts electrically isolated to ground. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + + 2 x ? 1.27 min. (0.050) 1.32 max. (0.052) notes 1 & 2 8 x 2.54 (0.10) 20.32 (0.80) 3.12 (0.123) 15.88 (0.625) 33.02 (1.30) 20.32 (0.80) 2.54 (0.10) 18 x ? 0.46 min. (0.018) 0.53 max. (0.021) note 1
16 performance specifications absolute maximum ratings 1 recommended operating environment transmitter section (t a = 0c to +70c, v cc = 4.75 v to 5.25 v) notes: 1. not necessarily applied together. does not guarantee operation under these conditions. 2. single ended amplitude - see figure 2 for definition. 3. with recommended metal shield in place and with 2 m/s forced airflow around the transceiver. 4. between 10 hz and 10 mhz and using power supply filter circuit as recommended. 5. output power is power coupled into a single mode fiber. 6. measured for tia/eia-526-4a. 7. the power supply current varies with temperature. maximum current is specified at v cc = maximum @ maximum temperature (not including termination?s) and end of life. 8. driven into 50 ohm load, measured single-ended. parameter symbol minimum maximum units notes storage temperature t s -40 +85 c- lead soldering temperature/time - - +240/10 c/s input voltage swing v in 02v2 power supply voltage v cct /v ccr 0+6v relative humidity (non-condensing) rh 0 95 % parameter symbol minimum maximum units notes power supply voltage v cc 4.75 5.25 v - ambient operating temperature t a op 0+70 c3 airflow 2 m/s 3 power supply noise tolerance psnt 50 mv p-p 4 parameter symbol minimum typical maximum units notes output center wavelength l ce 1270 - 1360 nm - output spectral width (rms) dl --1.0nm- average optical output power p o -4.5 - 0 dbm 5 extinction ratio e r 8.2 - - db 6 output eye compliant with bellcore gr-253-core and itu recommendation g.957 figure 17 supply current i cct --100ma7 power dissipation p diss --0.53w data input - single ended v in p - p 200 - 900 mv 8 figure 2b data input - differential v in p - p 400 - 1800 mv transmitter disable v txd v cct -1.3 v - v cct v9 transmitter enable v txe v ee -v eet +0.8 v v 9
17 receiver section (t a = 0 c to +70 c, v cc = 4.75 v to 5.25 v) notes: 9. worst case sensitivity and saturation levels for input signals 2 23 -1 prbs with 72 ones and 72 zeros inserted with a ber of 10 -10 (itu recommendation g.958), transmitter modulated with an independent data stream. 10.measured single-ended from clock rising edge to center of data eye. 11.low power ttl compatible output introduced to drive >10 k load. 12.complies with bellcore gr-253-core requirements for los. sd is los. 13.over entire dynamic range of receiver. 14.pecl signal input with figure 8 characteristics. 15.compliant with bellcore gr-253-core, sonet ti.105.06, sdh g.958. 16.when used with an 8 angled polished sc connector. parameter symbol minimum typical maximum units notes receiver sensitivity - - -22 -18.5 dbm 9 wavelength - 1270 - 1570 nm maximum input power - -- -3dbm9 supply current i ccr - 200 240 ma 7 power dissipation p diss -1.0 1.3 w data outputs - single ended - 300 - - mv p-p 8 figure 2a/b data outputs - differential - 600 - - mv p-p clock outputs - single ended - 250 - - mv p-p 8 figure 2a clock outputs - differential - 500 - - mv p-p clock/data alignment - 50 80 110 ps 10 figure 2a signal detect output high sd high v ccr -1.3 v - v ccr 11 signal detect output low sd low v ee -v ee +0.8 v 11 signal detect assert - - - -24 dbm - signal detect deassert - -45 - - dbm 12 signal detect assert time - - 16 - s 12 signal detect deassert time - 2.3 30 200 s 13 ref clk input frequency - - - 19.44 100 ppm mhz - clk input rise/fall trace t r / t f -- 7 ns14 figure 8 jitter tolerance figure 13 jitter generation - - - 0.01 ui 15 jitter transfer - - - - - figure 14 reflectance - - -50 -30 db 16
18 figure 24. typical transmitter data eye diagram with oc-48 mask table 1. hfct-5402 transceiver module 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 ref clk reference clock an externally generated clock of 19.44 mhz (for 2.48832 gb/s) or 1/128 of bit rate with a 100 ppm tolerance must be provided for operation of the clock recovery circuit. this single-ended input requires external ac coupling and clock input of 250 mv p-p minimum and 6 ns maximum rise time. the input stage is internally biased and 50 w terminated. 2v ee signal ground directly connect this pin to the signal ground plane. 3 clk- received recovered clock out bar - internally ac coupled (1 nf). the falling edge occurs in the middle of the received data baud period. terminate this differential clock output with 50 ohms line to the follow-on device. if this output is not used terminate with 50 ohms to v ee . 4 clk+ received recovered clock out - internally ac coupled (1 nf) the rising edge occurs in the middle of the received data baud period. terminate this differential clock output with 50 ohms line to the follow-on device. if this output is not used terminate with 50 ohms to v ee .
19 table 1. hfct-5402 transceiver module pin out table (continued) pin symbol functional description 5l 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. 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 - 1.5 v < v7 < v cct . transmitter output enabled: v eet < v7 < v cct - 4.2 v or open circuit. 8v ee signal ground directly connect this pin to the signal ground plane. 9 dnc do not connect 10 v ee signal ground directly connect this pin to the signal ground plane. 11 td+ transmitter data in requires an ac coupled input. the input stage is internally biased and 50 ohm terminated. 12 td- transmitter data in bar requires an ac coupled input. the input stage is internally biased and 50 ohm terminated. 13 v cct transmitter power supply provide +5 v dc via a 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 a receiver power supply filter circuit. locate the power supply filter circuit as close as possible to the v ccr pin. 15 sd signal detect normal input optical data levels above the receiver sensitivity result in a logic ? 1 ? output. loss of optical power to the receiver results in a fault indication shown by a logic ? 0 ? output. signal detect is a single-ended, internally terminated ttl output. this signal detect output can be used to drive a ttl input on an upstream circuit, such as, signal detect input or loss of signal-bar input. 16 rd- re-timed receiver data out bar - internally ac coupled (100 nf) terminate this differential data output with a 50 ohm line and a 50 ohm load at the follow-on device. 17 rd+ re-timed receiver data out - internally ac coupled (100 nf) terminate this differential data output with a 50 ohm line and a 50 ohm load at the follow-on device. 18 v ee signal ground directly connect this pin to signal ground plane.
ordering information HFCT-5402D - 2.5 gb/s with emc diffuser shield associated parts hfct-5001 - hfct-5402 evaluation board hfct-5400 - emc diffuser shield class 1 laser product: this product conforms to the applicable requirements of 21 cfr 1040 at the date of manufacture date of manufacture: agilent technologies ltd., whitehouse road, ipswich, england www.semiconductor.agilent.com data subject to change. copyright ? 2000 agilent technologies, inc. obsoletes: 5968-5288e (11/99) 5968-5288e (03/00

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