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vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 1 02/09/01 ? vitesse semiconductor corporation ? 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com features applications general description the VSC7969 is a 3.125gb/s transimpedance amplifier ic with a built-in limiting amplifier, a signal detect feature and a photocurrent monitor. the VSC7969 does not require any external electrical components in the construction of a high performance optical receiver such as for sonet/sdh applications. the analog output is a differential signal with a minimum amplitude of 200mvp-p (single-ended). the VSC7969 operates with a sin- gle power supply with a maximum power dissipation of 300mw. a pin photodiode or apd can be connected and separately biased to provide optimal performance. the VSC7969 provides filtered bias for msm and pin photodetectors; applications using an apd photode- tector must supply bias separately. the VSC7969 also provides a photocurrent monitor whose output is linearly proportional to the input photocurrent. the VSC7969 can operate from a single +3.3v supply or a +5v or -5.2v supply. the VSC7969 is offered in die form and in a 16-pin plastic thin-shrink small outline package (tssop-16). a fully tested to-46 outline packaged receiver with a photodetector is also available. block diagram ? i ntegrated tia and limiting amplifier low power consumption for sff applications to package-compatible layout on-chip signal detect on-chip linear photocurrent monitor single 3.3v supply 5v supply operation via wirebond option compatible with pin or avalanche detectors packages: 16-pin tssop, to-46, bare die 50 ? regulator VSC7969 +3.3v 0.1f voutp vccd outputs need to be ac-coupled dual power supply pins are provided for +5v or +3.3v operation. only one power supply pin should be connected. vccs voutn sd_out sd_adj imon 0.1f +3.3v +5v 50 ? signal detect monitor filter in gnd 2.488gb/s, 3.125gb/s sonet oc-48/ sdh stm-16 2.125gb/s fibre channel 2.5gb/s or 3.125gb/s ethernet applications with 8b/10b overhead sff transceivers
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 2 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com electrical characteristics table 1: ac specifications symbol parameter min typ max units conditions ? i ph input photocurrent swing 2.2 ma peak-to-peak ac current amplitude i phs-avg average photocurrent sensitivity 4 a -23dbm average optical power with a detector responsitivity of 0.8a/w. i phs-peak peak input photocurrent sensitivity 8 a -23dbm average optical power with a detector responsitivity of 0.8a/w. ? v out-se single-ended output voltage amplitude 200 250 300 mv single-ended peak-to-peak measurement, i in >20a. ? v out-diff differential output voltage amplitude 400 500 600 mv differential peak-to-peak measurement, i in >20a. t r , t f rise and fall time 60 100 ps at 2.2map-p input photocurrent swing. 20% to 80%. z t (1) transimpedance gain 20k 27k 40k ? differential measurement ? z t (1) ripple in passband transimpedance 1 db modulation frequency between f l and bw bw upper -3db bandwidth 2.2 2.5 3.0 ghz referenced to 10mhz, cpd = 0.6pf f l lower -3db cutoff frequency 100 khz referenced to 10mhz, cpd = 0.6pf with no external components z o output impedance 50 ? single-ended psrr power supply rejection ratio tbd i noise input-referred rms noise current 500 na 30khz to 2.5ghz c pd photodetector capacitance 0.4 0.6 0.8 pf bias voltage on detector at 2.0v sd h signal detect hysterisis 1 2 4 db electrical measurement on sd pin sd a-open signal detect assertion level 3 5 9 a average photocurrent with sd open. sd d-open signal detect deasseration level 1.0 2.2 3.0 a average photocurrent with sd open. sd a-short signal detect asseration level 6 10 18 a average photocurrent with sd shorted to ground. sd d-short signal detect deasseration level 2.0 4.4 6.0 a average photocurrent with sd shorted to ground. sd high signal detect high logic level v ccs - 0.3 v sd low signal detect low logic level 0.5 0.8 v
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 3 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com notes: (1) the transimpedance gain is defined as z t = ( ? v out - diff )/ ? i ph . (2) using 1111100000 pattern at 2.5gb/s to measure the standard deviation of the edge of the pattern, multiply the standard deviation by 14 to achieve the total random jitter. (3) +k 28.5 - k28.5 (00111110101100000101). table 2: dc specifications absolute maximum ratings (1) (at t a = +25 c, unless otherwise specified) power supply voltage (v ccs )......................................................................................................................... 3.6v power supply voltage (v ccd ) ........................................................................................................................ 5.5v junction temperature range ..................................................................................................... ... -40 c to +125 c storage temperature range ...................................................................................................... ... -40 c to +125 c relative ambient humidity ...................................................................................................... ........... 85%/+85 c note: (1) caution: stresses listed under ?absolute maximum ratings? may be applied to devices one at a time without caus- ing permanent damage. functionality at or above the values listed is not implied. exposure to these values for extended periods may affect device reliability. recommended operating conditions positive voltage supply (v ccs ) ...................................................................................................................... 3.3v positive voltage supply (v ccd )...................................................................................................................... 5.0v negative voltage rail (gnd) .................................................................................................... ........................ 0v ambient temperature range (t a ) (1) .............................................................................................. -40 c to +85 c mon slope of linear analog photocurrent monitor vs input optical power 0.8 a/w 0 ? to 2k ? to v cc with a detector responsitivity of 0.8a/w dc duty cycle -5 +5 % imon range photocurrent monitor linearity range 5 200 a imon offset photocurrent monitor offset 0 10 a r j random jitter (2) tbd ps peak-to-peak d j deterministic jitter (3) tbd ps peak-to-peak symbol parameter min typ max units conditions gnd negative supply rail 0 v v ccs positive supply rail for 3.3v operation 3.0 3.3 3.6 v v ccd positive supply rail for 5v operation 4.5 5.0 5.5 v icc power supply current 65 75 ma 3.3v v out-cm common-mode voltage on output pins v ccs - 125mv applicable to voutp and voutn pins at 50 ? load. v anode internal dc bias voltage on detector anode contact 0.8 0.9 1.0 v v cathode interal dc bias voltage on detector cathode contact v ccs - 0.15v v ccs v v cat-ext external dc bias voltage permissable on detector cathode contact 3.3 10 v v apd external dc bias voltage for use with avalanche photodetector 60 v symbol parameter min typ max units conditions
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 4 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com bare die descriptions figure 1: pad assignments VSC7969 die size: 1143m x 1453m (45.0mil x 57.2mil) die thickness: 279 m (11.0mil) pad size: 100m x 100m (3.9mil x 3.9mil) pad passivation opening: 86m x 86m (3.4mil x 3.4mil) scribe size: 143m (5.6mil) pad 7 sd_out pad 8 gnd pad 9 voutn pad 10 gnd pad 11 voutp pad 12 gnd pad 13 imon pad 14 voutp pad 15 gnd pad 16 csdn pad 17 csdp 1143m (45.0mil) 1467 m (57.2mil) 143 m (5.6mil) pad 18 gnd pad 19 gnd pad 5 sd_adj pad 4 sd_tp pad 3 gnd pad 2 bg_vref pad 1 gnd pad 6 voutn pad 25 vccs pad 24 gnd pad 23 in pad 22 filter pad 21 gnd pad 20 gnd pad 26 vccd
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 5 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com table 3: pad coordinates signal name pad number coordinates (m) description x y gnd 1 130 250 negative power supply rail (typically 0v) bg_vref 2 130 375 band gap voltage reference 1.24v for testpoint, no connect gnd 3 130 500 negative power supply rail (typically 0v) sd_tp 4 130 625 signal detect test point, do not connect. sd_adj 5 130 750 signal detect threshold adjustment (see application amd usage section) voutn 6 137 875 complementary logic output (logic low when photocurrent is high) sd_out 7 280 875 signal detect output (logic high when photocurrent exceeds sd a ) gnd 8 405 875 negative power supply rail (typically 0v) voutn 9 530 875 complementary logic output (logic low when photocurrent is high) gnd 10 655 875 negative power supply rail (typically 0v) voutp 11 780 875 positive logic output (logic high when photocurrent is high) gnd 12 905 875 negative power supply rail (typically 0v) imon 13 1030 875 photocurrent monitor voutp 14 1173 875 positive logic output (logic high when photocurrent is high) gmd 15 1180 750 negative power supply rail (typically 0v) csdn 16 1180 625 test point for signal detect capacitor. do not connect. csdp 17 1180 500 test point for signal detect capacitor. do not connect. gnd 18 1180 375 negative power supply rail (typically 0v) gnd 19 1180 250 negative power supply rail (typically 0v) gnd 20 1030 125 negative power supply rail (typically 0v) gnd 21 905 125 negative power supply rail (typically 0v) filter 22 780 125 photodetector cathode connection (filtered v cc ) in 23 530 125 photodetector anode connection gnd 24 405 125 negative power supply rail (typically 0v) vccs 25 280 125 positive power supply rail for 3.3v operation vccd 26 137 125 positive power supply rail for 5v operation
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 6 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com package pin descriptions figure 2: pin diagram table 4: pin identifications pin name pin no. description vcc 1 power supply gnd 2 ground gnd 3 ground in 4 photodetector anode connection filter 5 photodetector cathode connection (filtered v cc ) gnd 6 ground gnd 7 ground gnd 8 ground imon 9 photocurrent monitor gnd 10 ground gnd 11 ground voutp 12 positive logic output (logic high when photocurrent is high) voutn 13 complementary logic output (logic low when photocurrent is high) gnd 14 ground sd_out 15 signal detect output (logic high when photocurrent exceeds sd a ) sd_adj 16 signal detect threshold adjustment (see applications and usage section) 1 2 3 4 5 6 7 8 vcc gnd gnd in filter gnd gnd gnd sd_adj sd_out gnd voutn voutp gnd gnd imon 16 15 14 13 12 11 10 9 VSC7969
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 7 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com typical operating characteristics electrical eye diagram, input = 8ap-p, 3.125gb/s, prbs 2 31 -1 t a = o +25c, v cc = 3.3v electrical eye diagram, input = 100ap-p, 3.125gb/s, prbs 2 31 -1 t a = o +25c, v cc = 3.3v bit error rate vs input level imon characteristic, 0a to 200a input 1.00e-07 1.00e-08 1.00e-09 1.00e-10 1.00e-11 1.00e-12 1.00e-13 6.0 6.5 7.0 7.5 in (i pd ) ( ap-p) bit error rate vs input level 8.0 8.5 bitt eorr rate (ber) 250 200 150 100 50 0 0 50 100 in (dc current) ( a) i mon characteristic 0 a to 200 a input 150 200 i mon ( a)
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 8 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com circuit description the VSC7969 data path consists of several stages: transimpedance input stage, limiting amplifier, and out- put driver. the transimpedance amplifier accepts current from a photodetector connected to the input pad ? in ? and converts the input current to a differential output voltage. the signal then travels to the second stage limit- ing amplifier which provides dc restoration, eliminating the dc component of the input signal. the linear pho- tocurrent monitor and signal detect function is also provided by this stage. the final stage consists of an output driver with a differential pair connected to v cc via 50 ? internal pull-up resistors. the overall effective differ- ential transimpedance of the VSC7969 is typically 27k ? . the limited output single-ended voltage swing is typ- ically 250mvp-p. design guidelines power supply the VSC7969 is supplied by a single supply voltage; for +3.3v operation, the supply votlage should be applied to only v ccs . for +5v operation, the supply voltage should be applied to only v ccd . data outputs the outputs of the VSC7969 need to be ac-coupled. this capacitor will determine the low frequency cut- off for the system, which is directly related to the receiver ? s deterministic jitter. for atm/sonet or other applications using prbs nrz data, select a capacitor of at least 0.1f or greater, which provides less than 32khz low frequency cutoff. for fibre channel, gigabit ethernet, or other applications requiring 8b/10b data coding, select a capacitor of at least 0.01f or greater, which provides less than 320khz low frequency cutoff. the outputs can be used single-ended or differential. for best performance, differential operation is recom- mended. if single-ended operation is necessary, the unused output should be ac-coupled and terminated with an impedance equal to the load on the pin in use.
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 9 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com signal detect the signal detect feature of the VSC7969 provides a cmos level output corresponding to the input current level to the transimpedance amplifier. the assert and deassert levels of the signal detect pin can be adjusted by placing an optional resistor from sd_adj to ground. the following tables show the two extremes at which the signal detect pin will operate; open circuit and short-ciruit to ground. table 5: signal detect function, sd_adj open with sd_adj (pin 16) shorted to ground, thresholds are 3db higher, as shown in table 6. table 6: signal detect function, sd_adj shorted to ground photodetector current monitor the imon pin provides a linear measurement of the average input current from the photodetector to the transimpedance amplifier. for example, if 20a is the average input current to the transimpedance amplifier, the current through the imon pin will be 20a (see the typical operating curve ? imon characteristic, 0a to 200a ). to use this feature, connect the imon pin to v cc using a resistor less than 2k ? . if this feature is not used, the imon pin can be left unconnected. electrical min typ max units assert 3 5 9 a deassert 1 2.2 3 a hysteresis 1 2 4 db electrical min typ max units assert 6 10 18 a deassert 2 4.4 6 a hysteresis 1 2 4 db
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 10 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com application information gnd vcc voutp imon notes: no external components required. unused output is ac-coupled and terminated to 50 ? .
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 11 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com package information tssop-16 1. all dimensioning and tolerancing per asme. y14.5-1994 2. controlling dimension: millimeter 3. this outline conforms to jedec publication 95 registration ms-026
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 12 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com to-46 ball lens package 1. controlling dimenstion: millimeter top view side view reference isometric
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect g52355-0, rev 2.0 page 13 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com to-46 flat window package 1. controlling dimension: millimeter top view reference isometric
vitesse semiconductor corporation advance product information VSC7969 3.125gb/s integrated transimpedance and limiting amplifier with signal detect page 14 g52355-0, rev 2.0 02/09/01 ? vitesse semiconductor corporation 741 calle plano camarillo, ca 93012 tel: (800) vitesse fax: (805) 987-5896 email: prodinfo@vitesse.com internet: www.vitesse.com ordering information the order number for this product is formed by a combination of the device type and package type. VSC7969 xx device type package 3.125gb/s integrated transimpedance yd1: tssop-16, 3.3v supply yd2: tssop-16, 5v supply w: dice waffle pack wd1a: to-46 ball lens, 3.3v supply, voutn/voutp outputs wd1b: to-46 ball lens, 3.3v supply, voutn/imon outputs wd2a: to-46 ball lens, 5v supply, voutn/voutp outputs wd2b: to-46 ball lens, 5v supply, voutn/imon outputs and limiting amplfier with signal detect notice vitesse semiconductor corporation ( ? vitesse ? ) provides this document for informational purposes only. this document contains pre-production information about vitesse products in their concept, development and/or testing phase. all information in this document, includ ing descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. n othing contained in this document shall be construed as extending any warranty or promise, express or implied, that any vitesse product will be availabl e as described or will be suitable for or will accomplish any particular task. vitesse products are not intended for use in life support appliances, devices or systems. use of a vitesse product in such appl ications without writ- ten consent is prohibited.

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