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125 megabaud versatile link the versatile fiber optic connection technical data features ? data transmission at signal rates of 1 to 125 mbd over distances of 100 meters ? compatible with inexpen- sive, easily terminated plastic optical fiber, and with large core silica fiber ? high voltage isolation ? transmitter and receiver application circuit sche- matics and recommended board layouts available ? interlocking feature for single channel or duplex links, in a vertical or horizontal mount configuration applications ? intra-system links: board- to-board, rack-to-rack ? telecommunications switching systems ? computer-to-peripheral data links, pc bus extension ? industrial control ? proprietary lans ? digitized video ? medical instruments ? reduction of lightning and voltage transient susceptibility description the 125 mbd versatile link (hfbr-0507 series) is the most cost-effective fiber-optic solution for transmission of 125 mbd data over 100 meters. the data link consists of a 650 nm led transmitter, hfbr-15x7, and a pin/preamp receiver, hfbr- 25x6. these can be used with low-cost plastic or silica fiber. one mm diameter plastic fiber provides the lowest cost solution for distances under 25 meters. the lower attenuation of silica fiber allows data transmission over longer distance, for a small difference in cost. these compo- nents can be used for high speed data links without the problems common with copper wire solutions, at a competitive cost. the hfbr-15x7 transmitter is a high power 650 nm led in a low cost plastic housing designed to efficiently couple power into 1 mm diameter plastic optical fiber and 200 m m hard clad silica (hcs ? ) fiber. with the recom- mended drive circuit, the led operates at speeds from 1-125 mbd. the hfbr-25x6 is a high bandwidth analog receiver con- taining a pin photodiode and internal transimpedance amplifier. with the recommended applica- tion circuit for 125 mbd operation, the performance of the complete data link is specified for of 0-25 meters with plastic fiber and 0-100 meters with 200 m m hcs ? fiber. a wide variety of other digitizing circuits can be combined with the hfbr-0507 series to optimize performance and cost at higher and lower data rates. hfbr-0507 series hfbr-15x7 transmitters hfbr-25x6 receivers hcs ? is a registered trademark of spectran corporation.
2 hfbr-0507 series 125 mbd data link data link operating conditions and performance are specified for the hfbr-15x7 transmitter and hfbr-25x6 receiver in the recommended applications circuits shown in figure 1. this circuit has been optimized for 125 mbd operation. the applications engineering department in the agilent optical communication division is available to assist in optimizing link performance for higher or lower speed operation. recommended operating conditions for the circuits in figures 1 and 2. parameter symbol min. max. unit reference ambient temperature t a 070 c supply voltage v cc +4.75 +5.25 v data input voltage C low v il v cc -1.89 v cc -1.62 v data input voltage C high v ih v cc -1.06 v cc -0.70 v data output load r l 45 55 w note 1 signaling rate f s 1 125 mbd duty cycle d.c. 40 60 % note 2 link performance: 1-125 mbd, ber 10 -9 , under recommended operating conditions with recommended transmit and receive application circuits. parameter symbol min. [3] typ. [4] max. unit condition reference optical power budget, 1 m pof opb pof 11 16 db note 5,6,7 optical power margin, opm pof,20 3 6 db note 5,6,7 20 m standard pof link distance with l 20 27 m standard 1 mm pof optical power margin, opm pof,25 3 6 db note 5,6,7 25 m low loss pof link distance with extra l 25 32 m low loss 1 mm pof optical power budget, 1 m hcs opb hcs 7 12 db note 5,6,7 optical power margin, opm hcs,100 3 6 db note 5,6,7 100 m hcs link distance with hcs cable l 100 125 m notes: 1. if the output of u4c in figure 1, page 4 is transmitted via coaxial cable, terminate with a 50 w resistor to v cc - 2 v. 2. run length limited code with maximum run length of 10 m s. 3. minimum link performance is projected based on the worst case specifications of the hfbr-15x7 transmitter, hfbr-25x6 receiver, and pof cable, and the typical performance of other components (e.g. logic gates, transistors, resistors, capacitors, quantizer, hcs cable). 4. typical performance is at 25 c, 125 mbd, and is measured with typical values of all circuit components. 5. standard cable is hfbr-rxxyyy plastic optical fiber , with a maximum attenuation of 0.24 db/m at 650 nm and na = 0.5. extra low loss cable is hfbr-exxyyy plastic optical fiber, with a maximum attenuation of 0.19 db/m at 650 nm and na = 0.5. hcs cable is hfbr-h/vxxyyy glass optical fiber, with a maximum attenuation of 10 db/km at 650 nm and na = 0.37. 6. optical power budget is the difference between the transmitter output power and the receiver sensitivity, measured after 1 meter of fiber. the minimum opb is based on the limits of optical component performance over temperature, process, and recommended power supply variation. 7. the optical power margin is the available opb after including the effects of attenuation and modal dispersion for the minimum link distance: opm = opb - (attenuation power loss + modal dispersion power penalty). the minimum opm is the margin available for longterm led lop degradation and additional fixed passive losses (such as in-line connectors) in addition to the minimum specified distance.
3 hard clad silica fiber (200 m m hcs) transmitter application circuit: performance of the hfbr-15x7 transmitter in the recommended application circuit (figure 1) for hcs; 1-125 mbd, 25 c. parameter symbol typical unit condition note average optical power 200 m m hcs p avg -14.6 dbm 50% duty note 1, fig 3 cycle average modulated power 200 m m hcs p mod -16.2 dbm note 2, fig 3 optical rise time (10% to 90%) t r 3.1 ns 5 mhz optical fall time (90% to 10%) t f 3.4 ns 5 mhz high level led current (on) i f,h 60 ma note 3 low level led current (off) i f,l 6 ma note 3 optical overshoot - 200 m m hcs 30 % transmitter application circuit i cc 130 ma figure 1 current consumption - 200 m m hcs notes: 1. average optical power is measured with an average power meter at 50% duty cycle, after 1 meter of fiber. 2. to allow the led to switch at high speeds, the recommended drive circuit modulates led light output between two non-zero power levels. the modulated (useful) power is the difference between the high and low level of light output power (transmitted) or input power (received), which can be measured with an average power meter as a function of duty cycle (see figure 3). average modulated power is defined as one half the slope of the average power versus duty cycle: [p avg @ 80% duty cycle - p avg @ 20% duty cycle] average modulated power = CC (2) [0.80 - 0.20] 3. high and low level led currents refer to the current through the hfbr-15x7 led. the low level led off current, sometimes referred to as hold-on current, is prebias supplied to the led during the off state to facilitate fast switching speeds. plastic optical fiber (1 mm pof) transmitter application circuit: performance of the hfbr-15x7 transmitter in the recommended application circuit (figure 1) for pof; 1- 125 mbd, 25 c. parameter symbol typical unit condition note average optical power 1 mm pof p avg -9.7 dbm 50% duty note 1, fig 3 cycle average modulated power 1 mm pof p mod -11.3 dbm note 2, fig 3 optical rise time (10% to 90%) t r 2.1 ns 5 mhz optical fall time (90% to 10%) t f 2.8 ns 5 mhz high level led current (on) i f,h 19 ma note 3 low level led current (off) i f,l 3 ma note 3 optical overshoot - 1 mm pof 45 % transmitter application circuit i cc 110 ma figure 1 current consumption - 1 mm pof
4 plastic and hard clad silica optical fiber receiver application circuit: performance [4] of the hfbr-25x6 receiver in the recommended application circuit (figure 1); 1-125 mbd, 25 c unless otherwise stated. parameter symbol typical unit condition note data output voltage - low v ol v cc -1.7 v r l = 50 w note 5 data output voltage - high v oh v cc -0.9 v r l = 50 w note 5 receiver sensitivity to average p min -27.5 dbm 50% eye opening note 2 modulated optical power 1 mm pof receiver sensitivity to average p min -28.5 dbm 50% eye opening note 2 modulated optical power 200 m m hcs receiver overdrive level of average p max -7.5 dbm 50% eye opening note 2 modulated optical power 1 mm pof receiver overdrive level of average p max -10.5 dbm 50% eye opening note 2 modulated optical power 200 m m hcs receiver application circuit current i cc 85 ma r l = figure 1 consumption notes: 4. performance in response to a signal from the hfbr-15x7 transmitter driven with the recommended circuit at 1-125 mbd over 1 meter of hfbr-r/exxyyy plastic optical fiber or 1 meter of hfbr-h/vxxyyy hard clad silica optical fiber. 5. terminated through a 50 w resistor to v cc - 2 v. 6. if there is no input optical power to the receiver, electrical noise can result in false triggering of the receiver. in typical applications, data encoding and error detection prevent random triggering from being interpreted as valid data. refer to applications note 1066 for design guidelines. 5 c1 0.001 c2 0.1 r5 22 q1 bfq52 r6 91 r7 91 q2 bfq52 c20 10 c19 0.1 t x v ee 9 8 7 6 5 4 3 2 1 j1 q2 base q1 base t x v cc r x v cc pin 19 10h116 pin 18 10h116 r x v ee nc l1 cb70-1812 1 2 3 4 5 13 12 10 9 14 7 8 11 6 1 2 3 4 8 5 8 5 1 2 3 4 12 13 5 7 8 9 3 4 17 15 19 18 r24 1k r22 1k r18 51 r16 51 c17 0.1 v bb v cc c10 0.1 r19 51 r17 51 r15 1k r23 1k v bb c18 0.1 r25 1k r20 12 r21 62 v cc v bb 3 v c14 10 tl431 u5 mc10h116fn c15 0.1 c11 0.1 c16 0.1 c12 0.1 r14 1k v bb 3v c9 .47 r12 4.7 c13 0.1 hfbr-25x6 r13 4.7 u4c u4a u4b u3 r11* r10 15 c8* 74actq00 u1b 74actq00 u1d 74actq00 u1c r9* r8* hfbr-15x7 c7 0.001 c6 0.1 c5 10 c4 0.001 c3 0.1 q3 2n3904 v cc 74actq00 u1a pof 300 300 1k 43 pf r8 r9 r11 c8 hcs 82 82 470 120 pf tolerance 1% 1% 1% 1% the values of r8, r9, r11, and c8 are different for pof and hcs drive circuits. all capacitor values are in micro farads, with 10% tolerance (unless otherwise noted). all resistances are in ohms with 5% tolerance (unless otherwise noted). u2 mc10h116fn mc10h116fn 2 20 + + + 10 14 figure 1. transmitter and receiver application circuit with +5 v ecl inputs and outputs.
5 figure 2. recommended power supply filter and +5 v ecl signal terminations for the transmitter and receiver application circuit of figure 1. figure 4. typical optical power budget vs. data rate. figure 3. average modulated power. optical power budget ?b 10 21 15 9 data rate ?mbd 90 70 130 150 19 11 110 17 13 30 50 pof hcs 8 td 9 t x v ee 7 td 6 t x v cc 5 r x v cc 4 3 rd 2 rd 82 w 10 ? 0.1 ? 4.7 ? 0.1 ? 1 r x v ee +5 v ecl serial data source 0.1 ? 0.1 ? 82 w 120 w 120 w +5 v ecl serial data receiver 4.7 ? 10 ? + + + 5 v 82 w 82 w 120 w 120 w fiber-optic transceiver shown in figure 1 4.7 ? average power ?? 0 200 100 0 duty cycle ?% 20 40 80 100 150 50 60 average power, 50% duty cycle average modulated power
6 absolute maximum ratings parameter symbol min. max. unit reference storage temperature t s -40 85 c operating temperature t o -40 70 c lead soldering temperature 260 c note 1 10 s transmitter high level forward i f,h 120 ma 50% duty cycle input current 3 1 mhz transmitter average forward input current i f,av 60 ma reverse input voltage v r 3v 125 megabaud versatile link transmitter warning: when viewed under some conditions, the optical port may expose the eye beyond the maximum permissible exposure recommended in ansi z136.2, 1993. under most viewing conditions there is no eye hazard. caution: the small junction sizes inherent to the design of this component increase the component's suscepti- bility to damage from electrostatic discharge (esd). it is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by esd. hfbr-15x7 series description the hfbr-15x7 transmitters incorporate a 650 nanometer led in a horizontal (hfbr-1527) or vertical (hfbr-1537) gray housing. the hfbr-15x7 transmitters are suitable for use with current peaking to decrease response time and can be used with hfbr-25x6 receivers in data links operating at signal rates from 1 to 125 megabaud over 1 mm diameter plastic optical fiber or 200 m m diameter hard clad silica glass optical fiber. refer to application note 1066 for details for recommended interface circuits. anode 1 cathode 2 ground 3 ground 4 ground ground see note 6 cycle time
7 electrical/optical characteristics 0 to 70 c, unless otherwise stated. parameter symbol min. typ. [2] max. unit condition note transmitter output p t -9.5 -7.0 -4.8 dbm i f,dc = 20 ma, 25 c note 3 optical power, 1 mm pof -10.4 -4.3 0-70 c transmitter output p t -6.0 -3.0 -0.5 dbm i f, d c = 60 ma, 25 c note 3 optical power, 1 mm pof -6.9 -0.0 0-70 c transmitter output p t -14.6 -13.0 -10.5 dbm i f,dc = 60 ma, 25 c note 3 optical power, -15.5 -10.0 0-70 c 200 m m hcs ? output optical power d p t -0.02 db/ c temperature coefficient d t peak emission wavelength l pk 640 650 660 nm peak wavelength dl 0.12 nm/ c temperature coefficient d t spectral width fwhm 21 nm full width, half maximum forward voltage v f 1.8 2.1 2.4 v i f = 60 ma forward voltage d v f -1.8 mv/ c temperature coefficient d t transmitter numerical na 0.5 aperture thermal resistance, q jc 140 c/w note 4 junction to case reverse input breakdown v br 3.0 13 v i f,dc = -10 m a voltage diode capacitance c o 60 pf v f = 0 v, f = 1 mhz unpeaked optical rise t r 12 ns i f = 60 ma figure 1 time, 10% - 90% f = 100 khz note 5 unpeaked optical fall t f 9nsi f = 60 ma figure 1 time, 90% - 10% f = 100 khz note 5 notes: 1. 1.6 mm below seating plane. 2. typical data is at 25 c. 3. optical power measured at the end of 0.5 meter of 1 mm diameter plastic or 200 m m diameter hard clad silica optical fiber with a large area detector. 4. typical value measured from junction to pc board solder joint for horizontal mount package, hfbr-1527. q jc is approximately 30 c/w higher for vertical mount package, hfbr-1537. 5. optical rise and fall times can be reduced with the appropriate driver circuit; refer to application note 1066. 6. pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected; pins 3 and 4 are electrically unconnected. it is recommended that pins 3, 4, 5, and 8 all be connected to ground to reduce coupling of electrical noise. 7. refer to the versatile link family fiber optic cable and connectors technical data sheet for cable connector options for 1 mm plastic optical fiber and 200 m m hcs fiber. 8. the led current peaking necessary for high frequency circuit design contributes to electromagnetic interference (emi). care must be taken in circuit board layout to minimize emissions for compliance with governmental emi emissions regulations. refer to application note 1066 for design guidelines.
8 hp8082a pulse generator 50 ohm load resistor hp54002a 50 ohm bnc input pod hp54100a oscilloscope bcp model 300 500 mhz bandwidth silicon avalanche photodiode normalized spectral output power 620 1.2 0.6 0 wavelength (nm) 630 650 670 680 1.0 0.2 660 70?c 0.8 0.4 640 25?c 0?c figure 2. typical spectra normalized to the 25 c peak. figure 1. test circuit for measuring unpeaked rise and fall times. figure 3. typical forward voltage vs. drive current. figure 4. typical normalized output optical power vs. drive current. v f ?forward voltage ?v 1 2.4 2.0 1.6 i f,dc ?transmitter drive current (ma) 10 100 1.8 70?c 2.2 25?c 0?c p t ?normalized output power ?db 1 0 -15 -25 i f,dc ?transmitter drive current (ma) 10 100 -20 70?c -5 0?c -10 25?c
9 absolute maximum ratings parameter symbol min. max. unit reference storage temperature t s -40 +75 c operating temperature t a 0 +70 c lead soldering temperature 260 c note 1 10 s signal pin voltage v o -0.5 v cc v supply voltage v cc -0.5 6.0 v output current i o 25 ma 125 megabaud versatile link receiver caution: the small junction sizes inherent to the design of this component increase the component's suscepti- bility to damage from electrostatic discharge (esd). it is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by esd. hfbr-25x6 series description the hfbr-25x6 receivers contain a pin photodiode and transimpedance pre-amplifier circuit in a horizontal (hfbr- 2526) or vertical (hfbr-2536) blue housing, and are designed to interface to 1mm diameter plastic optical fiber or 200 m m hard clad silica glass optical fiber. the receivers convert a received optical signal to an analog output voltage. follow-on circuitry can optimize link performance for a variety of distance and data rate requirements. electrical bandwidth greater than 65 mhz allows design of high speed data links with plastic or hard clad silica optical fiber. refer to application note 1066 for details for recommended interface circuits. 1 2 ground 3 4 ground ground see notes 2, 4, 9 ground signal v cc cycle time
10 electrical/optical characteristics 0 to 70 c; 5.25 v 3 v cc 3 4.75 v; power supply must be filtered (see figure 1, note 2). parameter symbol min. typ. max. unit test condition note ac responsivity 1 mm pof r p,apf 1.7 3.9 6.5 mv/ m w 650 nm note 4 ac responsivity 200 m m hcs r p,hcs 4.5 7.9 11.5 mv/ m w rms output noise v no 0.46 0.69 mv rms note 5 equivalent optical noise input p n,rms - 39 -36 dbm note 5 power, rms - 1 mm pof equivalent optical noise input p n,rms -42 -40 dbm note 5 power, rms - 200 m m hcs peak input optical power - p r -5.8 dbm 5 ns pwd note 6 1 mm pof -6.4 dbm 2 ns pwd peak input optical power - p r -8.8 dbm 5 ns pwd note 6 200 m m hcs -9.4 dbm 2 ns pwd output impedance z o 30 w 50 mhz note 4 dc output voltage v o 0.8 1.8 2.6 v p r = 0 m w supply current i cc 915ma electrical bandwidth bw e 65 125 mhz -3 db electrical bandwidth * rise time 0.41 hz * s electrical rise time, 10-90% t r 3.3 6.3 ns p r = -10 dbm peak electrical fall time, 90-10% t f 3.3 6.3 ns p r = -10 dbm peak pulse width distortion pwd 0.4 1.0 ns p r = -10 dbm note 7 peak overshoot 4 % p r = -10 dbm note 8 peak notes: 1. 1.6 mm below seating plane. 2. the signal output is an emitter follower, which does not reject noise in the power supply. the power supply must be filtered as in figure 1. 3. typical data are at 25 c and v cc = +5 vdc. 4. pin 1 should be ac coupled to a load 3 510 w with load capacitance less than 5 pf. 5. measured with a 3 pole bessel filter with a 75 mhz, -3db bandwidth. 6. the maximum peak input optical power is the level at which the pulse width distortion is guaranteed to be less than the pwd listed under test condition. p r,max is given for pwd = 5 ns for designing links at 50 mbd operation, and also for pwd = 2 ns for designing links up to 125 mbd (for both pof and hcs input conditions). 7. 10 ns pulse width, 50% duty cycle, at the 50% amplitude point of the waveform. 8. percent overshoot is defined at: (v pk - v 100% ) CCCCCCCCCCCC 100% v 100% 9. pins 5 and 8 are primarily for mounting and retaining purposes, but are electrically connected. it is recommended that these pins be connected to ground to reduce coupling of electrical noise. 10. if there is no input optical power to the receiver (no transmitted signal) electrical noise can result in false triggering of the receiver. in typical applications, data encoding and error detection prevent random triggering from being interpreted as valid data. refer to application note 1066 for design guidelines.
11 figure 1. recommended power supply filter circuit. figure 2. simplified receiver schematic. figure 3. typical pulse width distortion vs. peak input power. figure 4. typical output spectral noise density vs. frequency. figure 5. typical rise and fall time vs. temperature..
versatile link mechanical dimensions versatile link printed circuit board layout dimensions horizontal modules hfbr-1527 hfbr-2526 horizontal modules hfbr-1537 hfbr-2526 hfbr-15x7 www.semiconductor.agilent.com data subject to change. copyright ? 1999 agilent technologies, inc. obsoletes 5962-9376e (4/94) 5965-6114e (11/99)

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