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gs2978 hd-linx? iii multi-rate dual slew-rate cable driver 1 of 15 gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 www.gennum.com features ? smpte 424m, smpte 292m, smpte 344m and smpte 259m compliant ? dual coaxial cable driving ou tputs with selectable slew rate ?50 differential pecl input ? pb-free and rohs compliant ? seamless interface to ot her hd-linx? iii family products ? single 3.3v power supply operation ? operating temperature range: 0c to 70c applications ? smpte 424m, smpte 292m, smpte 344m and smpte 259m coaxial cable serial digital interfaces. description the gs2978 is a high-speed bi cmos integrated circuit designed to drive one or two 75 co-axial cables. the gs2978 may drive data ra tes up to 2.97gb/s and provides two selectable slew rates in order to achieve compliance to sm pte 424m, smpte 259m, smpte 344m and smpte 292m. the gs2978 accepts a lvpecl le vel differential input that may be ac coupled. external bi asing resistors at the inputs are not required. power consumption is typically 168mw using a 3.3v power supply. the gs2978 is pb-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous subcomponents are rohs compliant. functional block diagram sdo r set sdo ddi ddi sd/hd bandgap reference and biasing circuit output stage & control input differential pair disable
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 2 of 15 revision history version ecr pcn date changes and/or modifications 7 151357 ? march 2009 added 2.5k reel option to section 6.6 ordering information . added maximum power consumption value to table 2-1: d c electrical c haracteristics . 6 150277 ? august 2008 updated data sheet format. added tape & reel part number to 6.6 ordering information . 5 147849 ? october 2007 c hanged minimum value of differential input signal amplitude in s ection 4.1 . 4 147552 ? s eptember 2007 c hanged input voltage s wing in table 2-2: a c electrical c haracteristics . 3 146309 ? july 2007 c orrected part number typo in ordering information on page 14 . 2 144827 41693 april 2007 added table 4-1: r s et vs. vod . 1 142318 ? november 2006 c onverting to data s heet. added section 6.4 s older reflow profiles . added typical orl values in a c electrical c haracteristics . 0 140608 ? may 2006 c hanged to preliminary data s heet. removed references to trial publication for s mpte 424m. modified i ih /i il conditions to 10 a in d c electrical c haracteristics and additive jitter in a c electrical c haracteristics . added section 4.3 output return loss measurement . b 139766 ? march 2006 c orrected pad standoff height and tolerances for pad width & package dimension. c orrected pad shape. a 138454 ? february 2006 new document.
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 3 of 15 contents features....................................................................................................................... ..........................................1 applications................................................................................................................... ......................................1 description.................................................................................................................... .......................................1 revision history ............................................................................................................... ..................................2 1. pin out..................................................................................................................... ..........................................4 1.1 pin assignment ............................................................................................................ ......................4 1.2 pin descriptions .......................................................................................................... ......................4 2. electrical characteristics .................................................................................................. ..........................5 2.1 absolute maximum ratings .................................................................................................. ........5 2.2 dc electrical characteristics ...... ....................................................................................... ...........5 2.3 ac electrical characterist ics ............................................................................................. ...........6 3. input/output circuits ....................................................................................................... ...........................7 4. detailed description........................................................................................................ .............................8 4.1 input interfacing ......................................................................................................... ......................8 4.2 output interfacing ........................................................................................................ ...................8 4.2.1 output amplitude (rset) .................................................................................................. 9 4.2.2 output disable........................................................................................................... ............9 4.3 output return loss measurement ............................................................................................ ..9 5. application information ..................................................................................................... ..................... 10 5.1 pcb layout ................................................................................................................ ....................... 10 5.2 typical application circuit ............................................................................................... ......... 10 6. package & ordering information .............................................................................................. ............ 11 6.1 package dimensions ........................................................................................................ ............. 11 6.2 recommended pcb footprint .. ........... ........... ........... ........... ........... ........... ........... ........... ....... .. 12 6.3 packaging data ............................................................................................................ ................... 12 6.4 solder reflow profiles .................................................................................................... .............. 13 6.5 marking diagram ........................................................................................................... ................ 14 6.6 ordering information ...................................................................................................... ............. 14
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 4 of 15 1. pin out 1.1 pin assignment figure 1-1: 16-pin qfn 1.2 pin descriptions center pa d ( b ottom of pa c ka g e) gs2978 (top view) 1 v ee ddi ddi 2 3 4 sdo sdo vcc 12 11 10 9 5 7 6 8 nc nc nc nc 13 14 15 1 6 nc disable nc rset sd/hd rsvd table 1-1: pin descriptions pin number name timing ty p e description 1,2 ddi, ddi analog input s erial digital differential input. 3v ee ? power most negative power supply connection. c onnect to g nd. 4r s et analog input external output amplitude control resistor. 5,8,13,14, 15,16 n c ??no c onnect. not bonded internally. 7r s vd ? reserved do not connect. 6di s able non s ynchronous input s erial output disable. when asserted low, the s do/ s do output driver is powered off. s do/ s do will float to v cc through the pull-up resistor. 9v cc ? power most positive power supply connection. c onnect to +3.3v. 10 s d/hd non s ynchronous input output slew rate control. when set hi g h, the output will meet s mpte 259m rise/fall time specifications. when set low, the serial outputs will meet s mpte424m and s mpte 292m rise/fall time specifications.
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 5 of 15 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics 11,12 s do , s do analog output s erial digital differential output. ? c enter pad ? power c onnect to most negative power supply plane following the recommendations in recommended p c b footprint on page 12 . table 1-1: pin descriptions pin number name timing ty p e description parameter value s upply voltage -0.5v to 3.6 v d c input e s d voltage 4kv s torage temperature range -50 c < t s < 125 c input voltage range (any input) -0.3 to (v cc +0.3)v operating temperature range 0 c to 70 c s older reflow temperature 260 c note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions or at any other condition beyond those indicated in the a c /d c electrical c haracteristic sections is not implied. table 2-1: dc electrical characteristics v cc = 3.3v 5%; t a = 0 c to 70 c , unless otherwise shown parameter symbol conditions min ty p max units s upply voltage v cc ? 3.135 3.3 3.465 v power c onsumption p d t a = 25 c , s do/ s do enabled ? 168 180 mw t a = 25 c , s do/ s do disabled ?96 ?mw s upply c urrent i s t a = 25 c , s do/ s do enabled ?51 ?ma t a = 25 c , s do/ s do disabled ?29 ?ma output voltage v c mout c ommon mode ? v cc - v out ?v
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 6 of 15 2.3 ac electrical characteristics input voltage v c min c ommon mode 1.4 + v ddi /2 ? v cc - v ddi /2 v s d/hd , di s able input v ih i ih <= 10 a2.0? ?v v il i il <= 10 a??0.8v table 2-1: dc electrical characteristics v cc = 3.3v 5%; t a = 0 c to 70 c , unless otherwise shown parameter symbol conditions min ty p max units table 2-2: ac electrical characteristics v cc = 3.3v 5%; t a = 0 c to 70 c , unless otherwise shown parameter symbol conditions min ty p max units notes s erial input data rate dr s do ???2.97 g b/s 1 additive jitter ? 2.97 g b/s ? 22 ? ps p-p ? ?1.485 g b/s ? 20 ? ps p-p ? ? 270mb/s ? 16 ? ps p-p ? rise/fall time t r , t f s d/hd =0 ? ? 135 ps 2 t r , t f s d/hd =1 400 ? 800 ps 2 mismatch in rise/fall time u t r , u t f ???35ps? duty cycle distortion ? s d/hd =0, 2.97 g b/s ? ? 27 ps 3 ? s d/hd =0, 1.485 g b/s ? ? 30 ps 3 ? s d/hd =1 ? ? 100 ps 3 overshoot ? s d/hd =0, ? ? 10 % 3 ? s d/hd =1 ? ? 8 % 3 output return loss orl 5 mhz ? 1.485 g hz 15 20 ? db 4 1.485 g hz ? 2.97 g hz 10 12 ? db 4 output voltage s wing v out r s et = 750 750 800 850 mv p-p 3 input voltage s wing u v ddi differential 100 ? 2200 mv p-p ? note s : 1. the input coupling capacitor must be set accordingly for lower data rates. 2. rise/fall time measur ed between 20% and 80%. 3. single ended into 75 external load. 4. orl depends on board design. the gs2978 achieves this specificati on on gennum's evaluation boards.
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 7 of 15 3. input/output circuits figure 3-1: differential input s tage (ddi/ ddi ) figure 3-2: differential output s tage ( s do/ s do ) figure 3-3: s lew rate s elect input s tage v cc v cc ddi ddi 10k 10k 5k 10k v cc i ref sdo sdo sd/hd v cc on chip referen c e
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 8 of 15 4. detailed description 4.1 input interfacing d di/ddi are high impedance differential inputs. the equivalent input circuit is shown in figure 3-1 . several conditions must be observed when interfacing to these inputs: ? the differential input signal amplit ude must be between 100 and 2200mvpp. ? the common mode voltage range must be as specified in the dc electrical characteristics on page 5 . ? for input trace lengths longer than ap proximately 1cm, the inputs should be terminated as shown in the typical application circuit. the gs2978 inputs are self-biased, allowing fo r simple ac coupling to the device. for serial digital video, a mini mum capacitor value of 4.7 f should be used to allow coupling of pathological test signals. a tantalum capacitor is recommended. sd/hd input pin the gs2978 sdo rise and fall ti mes can be set to comply with both smpte 259m/344m and smpte 424m / smpte 292m. for all smpte 259m standards, or any data rate that requires longer rise and fall time characteristics, the sd/hd pin must be set high by the application layer. for smpte 424m and smpte 292m standard s and signals which require faster rise and fall time s, this pin should be set low. 4.2 output interfacing the gs2978 outputs are current mode, an d will drive typically 800mv into a 75 load. these outputs are protected from accidental st atic damage with internal esd protection diodes. in order for a ddi output circuit using the gs 2978 to meet this specification, the output application circuit shown in typical application circuit on page 10 is recommended. the value of l comp will vary depending on the pcb la yout, with a typical value of 5.6nh . a 4.7 f capacitor is used for ac coupling the output of the device. this value is chosen to ensure that pathological signals can be coupled without a significant dc component occurring. please see application information on page 10 for more details.
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 9 of 15 4.2.1 output amplitude (rset) the output amplitude of the gs2978 can be adjusted by changing the value of the r set resistor as shown in table 4-1 . for an 800mv p-p output with a nominal 7% tolerance, a value of 750 is required. a 1% smt resistor should be used. the r set resistor is part of the high speed ou tput circuit of the gs2978. the resistor should be placed as close as possible to the r set pin. in addition, the pcb capacitance should be minimized at this node by removing the pcb groundplane beneath the r set resistor and the r set pin. 4.2.2 output disable the serial output disable (disable ), disables power to the current mode serial digital output driver. when asserted low, the sdo/sdo output driver is powered off. sdo/sdo will float to v cc through the pull-up resistor. note: if the disable pin is left as a no connect (nc), the sdo/sdo outputs are still active. 4.3 output return loss measurement to perform a practical return loss measurement, it is necessary to force the gs2978 output to a dc high or low condition. the actual measured return loss will be based on the outputs being static at v cc or v cc -1.6v. under normal operating conditions the outputs of the device swing between v cc -0.4v and v cc -1.2v. table 4-1: r set vs. v od r set r ( ) output swing (mvp-p) 995 608 824 734 750 800 680 884 573 1040 note: for reliable operation of the gs 2978 over the full temperature range, do not use an r s et value below 573 .
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 10 of 15 5. application information 5.1 pcb layout special attention must be paid to compon ent layout when desi gning serial digital interfaces for hdtv. an fr-4 dielectric can be used, however, controlled impedance transmission lines are required for pcb traces longer than approximately 1cm. note the following pcb artwork features used to optimize performance: ? the pcb trace width for hd rate signals is closely matched to smt component width to minimize reflections due to changes in trace impedance. ? the pcb ground plane is removed under the gs2978 output components to minimize parasitic capacitance. ? the pcb ground plane is removed under the gs2978 r set pin and resistor to minimize parasitic capacitance. ? input and output bnc connectors are surface mounted in-line to eliminate a transmission line stub caused by a bnc mounting via high speed traces which are curved to minimize impedance variations due to change of pcb trace width. 5.2 typical application circuit figure 5-1: typical application c ircuit sd/hd gs2978 1 2 3 4 12 11 10 9 ddi ddi vee rset sdo sdo sd/hd vcc 10n 75 5. 6 n* 4u7 bnc vcc 75 5. 6 n* 10n 75 4u7 49.9 750 10n 49.9 4u7 75 bnc vcc 4u7 vcc * typical value: varies with layout differential data input note: all resistors in ohms, c apa c itors in fara d s, an d in d u c tors in henrys, unless otherwise note d . disable 6 disable
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 11 of 15 6. package & ordering information 6.1 package dimensions 4.00+/-0.05 b 4.00+/-0.05 2x 2x 0.15 0.15 c c 0.10 c 16x 0.08 c seating plane 0.85+/-0.05 0.00-0.05 0.65/2 0.65 detail b scale:nts datum a or b terminal tip 0.20 ref datum b detail b 0.65 16x 0.35+/-0.05 0.10 0.05 c a b c datum a 2.76+/-0.10 0.40+/-0.05 2.76+/-0.10 detail b center tab pin 1 area a c
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 12 of 15 6.2 recommended pcb footprint the center pad should be connected to the most negative power supply plane (vee) by a minimum of 5 vias. note: suggested dimensions only. final dimensions shou ld conform to customer design rules and process optimizations. 6.3 packaging data 0.35 0.55 2.76 3.70 2.76 3.70 note: all dimensions are in millimeters. 0.65 c enter pad parameter value package type 4mm x 4mm 16-pin qfn package drawing reference jede c m0220 moisture s ensitivity level 3 junction to c ase thermal resistance, j-c 31.0 c /w junction to air thermal resistance, j-a (at zero airflow) 43.8 c /w psi, 11.0 c /w pb-free and roh s compliant yes
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 13 of 15 6.4 solder reflow profiles the device is manufactured with matte-sn terminations and is compatible with both standard eutectic and pb-free solder reflow profiles. msl qualification was performed using the maximum pb-free reflow profile shown in figure 6-1 .the recommended standard pb reflow profile is shown in figure 6-2 . figure 6-1: maximum pb-free s older reflow profile (preferred) figure 6-2: s tandard pb reflow profile 25c 150c 200c 217c 2 6 0c 250c time temperature 8 min. max 6 0-180 se c . max 6 0-150 se c . 20-40 se c . 3c/se c max 6 c/se c max 25c 100c 150c 183c 230c 220c time temperature 6 min. max 120 se c . max 6 0-150 se c . 10-20 se c . 3c/se c max 6 c/se c max
gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 14 of 15 6.5 marking diagram 6.6 ordering information gs 297 8 xxxxe 3 yyww xxxx - lot/work order id yyww - date code yy - 2-digit year ww - 2-digit week number pin 1 indicator part number package temperature range gs 2978 gs 2978- c ne3 16-pin qfn 0 c to 70 c gs 2978 gs 2978- c te3 16-pin qfn 250pc reel 0 c to 70 c gs 2978 gs 2978- c nte3z 16-pin qfn 2,500pc reel 0 c to 70 c
ottawa 232 herzberg road, s uite 101 kanata, ontario k2k 2a1 c anada phone: +1 (613) 270-0458 fax: +1 (613) 270-0429 calgary 3553 - 31st s t. n.w., s uite 210 c algary, alberta t2l 2k7 c anada phone: +1 (403) 284-2672 united kingdom north building, walden c ourt parsonage lane, bishop?s s tortford hertfordshire, c m23 5db united kingdom phone: +44 1279 714170 fax: +44 1279 714171 india #208(a), nirmala plaza, airport road, forest park s quare bhubaneswar 751009 india phone: +91 (674) 653-4815 fax: +91 (674) 259-5733 snowbush ip - a division of gennum 439 university ave. s uite 1700 toronto, ontario m5 g 1y8 c anada phone: +1 (416) 925-5643 fax: +1 (416) 925-0581 e-mail: sales@snowbush.com web s ite: http://www.snowbush.com mexico 288-a paseo de maravillas jesus ma., aguascalientes mexico 20900 phone: +1 (416) 848-0328 japan kk s hinjuku g reen tower building 27f 6-14-1, nishi s hinjuku s hinjuku-ku, tokyo, 160-0023 japan phone: +81 (03) 3349-5501 fax: +81 (03) 3349-5505 e-mail: gennum-japan@gennum.com web s ite: http://www.gennum.co.jp ta i w a n 6f-4, no.51, s ec.2, keelung rd. s inyi district, taipei c ity 11502 taiwan r.o. c . phone: (886) 2-8732-8879 fax: (886) 2-8732-8870 e-mail: gennum-taiwan@gennum.com germany hainbuchenstra?e 2 80935 muenchen (munich), g ermany phone: +49-89-35831696 fax: +49-89-35804653 e-mail: gennum-germany@gennum.com north america western region bayshore plaza 2107 n 1st s treet, s uite #300 s an jose, c a 95131 united s tates phone: +1 (408) 392-9454 fax: +1 (408) 392-9427 e-mail: naw_sales@gennum.com north america eastern region 4281 harvester road burlington, ontario l7l 5m4 c anada phone: +1 (905) 632-2996 fax: +1 (905) 632-2055 e-mail: nae_sales@gennum.com korea 8f jinnex lakeview bldg. 65-2, bangidong, s ongpagu s eoul, korea 138-828 phone: +82-2-414-2991 fax: +82-2-414-2998 e-mail: gennum-korea@gennum.com document identification data sheet the product is in production. gennum reserves the right to make changes to the product at any time without notice to improve reliability, function or design, in order to provide the best product possible. gs2978 hd-linx? iii multi-rate dual slew-rate cable driver data sheet 37186 - 7 march 2009 15 of 15 15 g ennum c orporation assumes no liability for any errors or omissions in th is document, or for the use of the circuits or devices describ ed herein. the sale of the circuit or device described herein does not imply any patent license, and g ennum makes no representation that the circuit or device is free from patent infringement. all other trademarks mentioned are the properties of their respective owners. g ennum and the g ennum logo are registered trademarks of g ennum c orporation. ? c opyright 2006 g ennum c orporation. all rights reserved. www.gennum.com gennum corporate headquarters 4281 harvester road, burlington, ontario l7l 5m4 c anada phone: +1 (905) 632-2996 fax: +1 (905) 632-2055 e-mail: corporate@gennum.com www.gennum.com caution ele c tro s tati c s en s itive devi c e s do not open pa c ka g e s or handle ex c ept at a s tati c -free work s tation

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