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gs2988 dual-slew-rate, cable driver with 3gb/s capability 1 of 17 gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 www.gennum.com features ? smpte 424m, smpte 292m and smpte 259m compliant ? supports dvb-asi at 270mb/s ? supports data rates from 270mb/s to 2.97gb/s ? wide common-mode range input buffer ? 100mv sensitivity ? supports dc-coupling to industry-standard differential logic ? on-chip 100 differential data input termination ? input signal trace equalization ? differential coaxial-cable-driving output ? selectable slew rates ? adjustable output swing from 500mvpp to 1800mvpp ? disable control ? robust output signal presence function ? excellent output eye quality ? power supply operation at 3.3v or 2.5v ? 110mw power consumption (2.5v supply) ? operating temperature range: -40c to +85c ? small footprint qfn package (4mm x 4mm) ? drop-in compatible to the gs2978 ? pb-free and rohs compliant applications ? smpte 424m, smpte 292m and smpte 259m coaxial cable serial digital interfaces description the gs2988 is a high-speed bicmos integrated circuit designed to drive one to two 75 coaxial cables. the gs2988 may drive data rates up to 2.97gb/s and provides two selectable slew rates in order to achieve compliance to smpte 424m, smpte 292m and smpte 259m. the gs2988 accepts industry-standard differential input levels including lvpecl and cml. input trace equalization compensates for up to 10 inches of fr4 trace loss while in hd and 3g modes. this feature can be disabled using the eq_en pin. the disable pin powers-down the entire device. the gs2988 features adjustable output swing using an external bias resistor. the single-ended output swing is adjustable from 500mvpp to 1800mvpp. an output signal presence function, the osp pin, indicates whether an active signal is present at the output of the gs2988. the gs2988 can be powered from either a 3.3v or a 2.5v supply. power consumption is typically 110mw using a 2.5v power supply. the gs2988 is pb-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous subcomponents are rohs compliant.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 2 of 17 functional block diagram revision history version ecr pcn date changes and/or modifications 4 155552 C december 2010 corrected the marking diagram . 3 155359 C november 2010 clarified the functionality of the eq_en pin in table 1-1: pin descriptions and throughout the document. 2 155070 C october 2010 updated typical application circuit . 1 153602 C february 2010 converted document to data sheet. 0 153455 C january 2010 converted document to preliminary data sheet. changed additive jitter numbers in table 2-2: ac electrical characteristics . b 152690 C october 2009 updates to section 2. electrical characteristics . corrections to section 3. input/output circuits . a 151623 C april 2009 new document. ddi ddi r s et equalizer o s p eq_en s d/hd s do s do di s able ban d gap referen c e & output c ontrol output s i g nal presen c e s lew rate c ontrol
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 3 of 17 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 ............................................................................................. ...........6 2.3 ac electrical characteristics ............................................................................................. ...........7 3. input/output circuits ....................................................................................................... ...........................8 4. detailed description........................................................................................................ .............................9 4.1 serial data input ......................................................................................................... ......................9 4.2 input trace-equalization .................................................................................................. ..............9 4.3 serial data output ........................................................................................................ ....................9 4.3.1 slew rate selection (rise/fall time requirement)....................................................9 4.4 output disable ............................................................................................................ .................... 10 4.5 output signal presence indicator (osp ) ................................................................................. 10 4.6 output amplitude (rset) ................................................................................................... ........ 10 4.7 output return loss measurement ........................................................................................... 1 2 5. application information ..................................................................................................... ..................... 13 5.1 pcb layout ................................................................................................................ ....................... 13 5.2 typical application circuit ............................................................................................... ......... 13 6. package & ordering information .............................................................................................. ............ 14 6.1 package dimensions ........................................................................................................ ............. 14 6.2 recommended pcb footprint ................................................................................................. .. 15 6.3 packaging data ............................................................................................................ ................... 15 6.4 solder reflow profiles .................................................................................................... .............. 16 6.5 marking diagram ........................................................................................................... ................ 16 6.6 ordering information ...................................................................................................... ............. 17
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 4 of 17 1. pin out 1.1 pin assignment figure 1-1: 16-pin qfn 1.2 pin descriptions 5 6 78 1 6 15 14 13 ddi 1 2 3 4 ddi 12 11 10 9 v cc vee groun d pa d ( b ottom of pa c ka g e) di s able s d/hd o s p n/ c s do s do r s et g s 2988 1 6 -pin qfn (top view) eq_en n/ c n/ c n/ c n/ c table 1-1: pin descriptions pin number name ty p e description 1, 2 ddi, ddi input serial data differential input. 3 vee power most negative power supply connection for the input buffer and core. connect to g nd. 4 rset input external output amplitude control resistor connection. 5, 7, 8, 13, 15 n/c ? no connect. these pins are not connected internally. 6disable input control signal input. when set low, the entire device is powered-down. when set hi g h, the sdo/sdo pins will output a serial data signal. note: if this pin is left floating, the serial data output will be enabled . 9 vcc power most positive power supply connection. connect to 3.3v or 2.5v.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 5 of 17 2. electrical characteristics 2.1 absolute maximum ratings 10 sd/hd input control signal input. when set hi g h, the serial data output will meet the smpte 259m rise/fall time specification. when set low, the serial output will meet the smpte 292m and smpte 424m rise/fall time specification. note: if this pin is left floating, the serial data output will meet the smpte 259m rise/fall time specification. 11, 12 sdo / sdo output serial data differential output. 14 osp output output signal presence status signal output. signal levels are lvcmos/lvttl compatible. indicates presence of a valid output signal. when the osp pin is low, a good input signal has been detected within the output stage pre-driver. when this pin is hi g h, the output signal is invalid at the output of the pre-driver. 16 eq_en input control signal input. when set low, trace-e q ualization is turned on. when set hi g h, trace-e q ualization is turned off. note 1: if this pin is left floating, trace-e q ualization is turned off. note 2: this pin must be pulled hi g h or left floating for operation in sd mode. C center pad power connect to most negative power supply plane following the recommendations in recommended pcb footprint on page 15 . table 1-1: pin descriptions pin number name ty p e description parameter value supply voltage -0.5v to 3.6 v dc input esd voltage 2.5kv storage temperature range -50c < t s < 125c input voltage range (any input) -0.3 to (v cc +0.3)v operating temperature range -40c to +85c solder reflow temperature 260c 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 ac/dc electrical characteristic sections is not implied.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 6 of 17 2.2 dc electrical characteristics table 2-1: dc electrical characteristics v cc = 3.3v 5% or 2.5v 5%; t a = -40c to +85c, unless otherwise shown parameter symbol conditions min ty p max units notes supply voltage v cc 3.3v typical 3.135 3.3 3.465 v C 2.5v typical 2.375 2.5 2.625 v C power consumption (2.5v) p d sdo/sdo enabled C 110 130 mw 1 sdo/sdo disabled C 3 5 mw 1 power consumption (3.3v) sdo/sdo enabled C 155 183 mw 1 sdo/sdo disabled C 4 6 mw 1 supply current i s vcc = 3.3v C 47 53 ma 1 vcc = 2.5v C 44 50 ma 1 power-down C 1 1.8 ma 1 output voltage v cmout common mode C v term - v out CvC input voltage v cmin common mode 1.4 + v ddi /2 C v cc - v ddi /2 v C sd/hd , disable , eq_en input v ih i ih <= 150 a1.7CCvC v il i il <= 150 aCC0.8vC osp drive strength C C 2 C C ma C notes: 1. power consumed in gs2988 only. termination resistors draw extra current.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 7 of 17 2.3 ac electrical characteristics table 2-2: ac electrical characteristics v cc = 3.3v 5% or 2.5v 5%; t a = -40c to +85c, unless otherwise shown parameter symbol conditions min ty p max units notes serial input data rate dr sdo C.27C2.97 g b/s 1 additive jitter C 2.97 g b/s C 10 C ps p-p 2 C 1.485 g b/s C 10 C ps p-p 2 C 270mb/s C 30 C ps p-p 2 rise/fall time t r , t f sd/hd =0 C C 135 ps 3 t r , t f sd/hd =1 400 C 800 ps 3 mismatch in rise/fall time u t r , u t f hd/3 g modes only C C 35 ps C duty cycle distortion C sd/hd =0, 2.97 g b/s C C 14 ps 4, 5 C sd/hd =0, 1.485 g b/s C C 20 ps 4, 5 C sd/hd =1 C C 50 ps 4, 5 overshoot C sd/hd =0, C C 10 % 4 output return loss orl 5 mhz C 1.485 g hz 17 19 C db 6 1.485 g hz C 2.97 g hz 13 15 C db 6 output voltage swing v out r set = 750 750 800 850 mv p-p 4 input voltage swing u v ddi g uaranteed functional. 100 C 250 mv p-pd C g uaranteed to meet all published specifications. 250 2200 mv p-pd C output enable delay C C C C 100 ns C output disable delay C C C C 80 ns C notes: 1. the input coupling capacitor must be set accordingly for lower data rates. 2. turning on input trace equalization will reduce jitter in most applications. 3. rise/fall time measured between 20% and 80%. 4. single-ended into 75 external load. 5. calculated as the actual positive bit-width compared to the expected positive bit-width using a 1010 pattern. 6. orl depends on board design. the gs2988 achieves this specification on gennum's evaluation boards.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 8 of 17 3. input/output circuits figure 3-1: differential input stage (ddi/ddi ) figure 3-2: differential output stage (sdo/sdo ) figure 3-3: control input (disable , sd/hd , eq_en ) v cc v cc ddi ddi 50 50 5k 10k eq r c * v cc 700p * r c network for tra c e equalization v cc i ref s do s do v cc in vref pull-up 80a typi c al (50-150a)
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 9 of 17 4. detailed description 4.1 serial data input the gs2988 features a differentia l input buffer with on-chip 100 differential termination. the serial data input signal is connected to the ddi and ddi input pins of the device. input signals can be single-ended or differential, dc or ac-coupled. the serial data input buffer is capable of operation with any binary coded signal that meets the input signal level requirements, in the range of 270mb/s to at least 2.97gb/s. the input circuit is self-biasing to allow for simple ac or dc-coupling of input signals to the device. 4.2 input trace-equalization the gs2988 features fixed trace-equalization to compensate for pcb trace dielectric losses. note: this feature is not available in sd mode, and therefore trace-equalization must be disabled when operating in this mode. the trace-equalization has two settings, off and on. on invokes a typical 3db gain value at 1.5ghz. this value is optimized for compensating the high-frequency losses associated with approximately 10 inches of 5-mil stripline in fr4 material. 4.3 serial data output the gs2988 features a current-mode differential output driver capable of driving up to 1800mvpp single-ended into a 1m length of 75 cable terminated at both ends. the output signal amplitude or swing is us er configurable using an external rset resistor. the sdo/sdo pin of the device provide the serial data outputs. 4.3.1 slew rate selection (rise/fall time requirement) the gs2988 supports two user-selectable output slew rates. control of the slew rate is determined by the setting of the sd/hd input pin. table 4-1: input trace-equalization eq_en function 0 typical 3db trace e q ualization 1trace e q ualization off floating trace e q ualization off
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 10 of 17 4.4 output disable the gs2988 supports an output disable function for the serial data differential output. control of this function is determined by the setting of the disable control pin. the serial output disable (disable ), disables power to the entire device. when asserted low, the sdo/sdo output driver is powered-down. 4.5 output signal presence indicator ( osp ) the gs2988 supports an output signal presence indicator function. the output signal presence pin (osp ) is an active-low output that indicates when a valid output signal has been detected at the pre-driver output. the output signal presence function measures signal-edge energy to indicate that the pre-driver to the serial data outputs is toggling. 4.6 output amplitude (rset) the output amplitude of the gs2988 can be adjusted by changing the value of the rset resistor as shown in figure 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. table 4-2: slew rate selection sd/hd rise/fall time 0 smpte 424m & 292m compliant 1 smpte 259m compliant floating smpte 259m compliant table 4-3: output disable disable sdo/sdo 0 all chip power down 1 operational floating operational table 4-4: output signal presence indicator pre-driver output osp pin valid signal present 0 no valid signal present 1
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 11 of 17 the rset resistor is part of an internal dc feedback loop in the gs2988. the resistor should be placed as close as possible to the r set pin, and connected directly to the vcc plane (traces/wires may cause instability). in addition, the pcb capacitance should be minimized at this node by removing the pcb groundplane beneath the rset resistor and the rset pin. note: care should be taken when considering layout of the rset resistor. please refer to section 5.1 for more details. figure 4-1: v out vs. rset in order to determine the best starting value for rset, the following formula should be used: rset = 8*(rtrm/voutppse) where voutppse is in volts, and both resistances are in . rtrm is the value of the termination resistors, which should be equal to the characteristic impedance of the cable, and is typically 75 . the cable must be short ( 1m), and terminated at both ends for the formula to be valid. example: for a 75 cable, rtrm = 75 (at both ends), voutppse = 800mv rset = 8*(75/0.8) = 750 1.75 1.5 1.25 1.0 0.75 0.5 0.25 2.0 0.250 0.500 0.750 1.0 1.25 1.5 r s et (k ) vout (v)
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 12 of 17 this formula is not valid for long, unterminated, or improperly terminated cables. this formula should be considered as a starting point, and actual swing values may vary based on layout. also, for large output swin gs (>1040mv), smaller rset values may be required in order to achieve the desired output swing level at hd and 3g data rates. 4.7 output return loss measurement the gs2988 has a feature which allows users to measure orl reliably while the device is still powered. the device can be put into a balance mode which prevents the outputs from toggling while the device is powered on, allowing the orl to be measured while the device is still powered. when eq_en is low while sd/hd is high, the device goes into balance mode. this mode is used during orl measurement, disabling the ac signal path of the device without powering it down. when in balance mode, the device produces equal pull-down currents in both differential shoulders of the serial data differential output, effectively stopping the output at the output common mode voltage level. gennum recommends using balance mode when measuring orl with 2.5v termination voltage. table 4-5: typical rset values output swing (mv) rset ( ) 1800 * 332 800 750 500 1210 * note: in order to generate output swings greater than 1040mv, vcc_term must be connected to a 5v supply.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 13 of 17 5. application information 5.1 pcb layout special attention must be paid to component layout when designing 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 gs2988 output components to minimize parasitic capacitance (note: care should be taken, as removing too much of the plane will make the system susceptible to emi) ? the pcb ground plane is removed under the gs2988 rset pin and resistor to minimize parasitic capacitance. the rset resistor should be directly connected to the vcc plane ? 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 ? high-speed traces are curved to minimize impedance variations due to change of pcb trace width note: for more recommendations on trace lengths, orl inductor values and other pcb layout considerations, please refer to gennum?s gs2989 design guide (doc id 52070). 5.2 typical application circuit figure 5-1: typical application circuit ddi 2 ddi 3 1 v cc 4 vee s do 12 s do 11 10 9 r s et di s able 6 **eq_en 1 6 s d/hd o s p 14 g s 2988 75r 4u7 4u7 75r v cc _term v cc _term 10n 10n gnd gnd 4u7 4u7 75r 75r 5n 6 * 5n 6 * gnd v cc gnd v cc 10n 10n r* * typi c al value: varies with layout, an d represents a tra d e-off b etween g oo d eye shape an d output return loss. 5n 6 is the optimum value for an 800mv output swin g . 6 n8 is the optimum value for an 1800mv output swin g . note: all resistors in ohms, c apa c itors in fara d s, an d in d u c tors in henrys, unless otherwise state d . * c ustomer to c hoose resistor value. **please refer to se c tion 4.2.
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 14 of 17 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
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 15 of 17 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 dime nsions should 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 center pad parameter value package type / dimensions / pad pitch 16-pin qfn / 4mm x 4mm / 0.65mm package drawing reference jedec m0220 moisture sensitivity level 3 junction to case thermal resistance, j-c 31.0c/w junction to air thermal resistance, j-a (at zero airflow) 43.8c/w psi, 11.0c/w pb-free and rohs compliant, halogen-free yes
gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 16 of 17 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 . figure 6-1: maximum pb-free solder reflow profile (preferred) 6.5 marking diagram 25 c 150 c 200 c 217 c 2 6 0 c 250 c time temperature 8 min. max 6 0-180 se c . max 6 0-150 se c . 20-40 se c . 3 c /se c max 6 c /se c max instructions: g s2988 package mark xxxx last 4 digits (excluding decimal) of sap batch assembly (fin) as listed on packing slip e3 pb-free & g reen indicator yyww date code pin 1 indicator g s2988 xxxxe3 yyww
ottawa 232 herzberg road, suite 101 kanata, ontario k2k 2a1 canada phone: +1 (613) 270-0458 fax: +1 (613) 270-0429 calgary suite 320, 3553 31st st. n.w. calgary, alberta t2l 2k7 canada phone: +1 (403) 284-2672 fax: +1 (905) 632-2055 united kingdom south building, walden court parsonage lane, bishops stortford hertfordshire, cm23 5db united kingdom phone: +44 1279 714170 fax: +44 1279 714171 india #208(a), nirmala plaza, airport road, forest park s q uare bhubaneswar 751009 india phone: +91 (674) 65304815 fax: +91 (674) 259-5733 snowbush ip - a division of gennum 439 university ave. suite 1700 toronto, ontario m5 g 1y8 canada phone: +1 (416) 925-5643 fax: +1 (416) 925-0581 e-mail: sales@snowbush.com web site: http://www.snowbush.com mexico venustiano carranza 122 int. 1 centro, aguascalientes mexico cp 20000 phone: +1 (416) 848-0328 japan kk shinjuku g reen tower building 27f 6-14-1, nishi shinjuku shinjuku-ku, tokyo, 160-0023 japan phone: +81 (03) 3349-5501 fax: +81 (03) 3349-5505 e-mail: gennum-japan@gennum.com web site: http://www.gennum.co.jp ta i w a n 6f-4, no.51, sec.2, keelung rd. sinyi district, taipei city 11502 taiwan r.o.c. phone: (886) 2-8732-8879 fax: (886) 2-8732-8870 e-mail: gennum-taiwan@gennum.com germany g ennum canada limited niederlassung deutschland mnchen, g ermany phone: +49 89 309040 290 fax: +49 89 309040 293 e-mail: gennum-germany@gennum.com north america western region 691 south milpitas blvd., suite #200 milpitas, ca 95035 united states phone: +1 (408) 934-1301 fax: +1 (408) 934-1029 e-mail: naw_sales@gennum.com north america eastern region 4281 harvester road burlington, ontario l7l 5m4 canada phone: +1 (905) 632-2996 fax: +1 (905) 632-2055 e-mail: nae_sales@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. gs2988 dual-slew-rate, cable driver with 3gb/s capability data sheet 52131 - 4 december 2010 17 of 17 17 g ennum corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described 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 corporation. ? copyright 2009 g ennum corporation. all rights reserved. www.gennum.com gennum corporate headquarters 4281 harvester road, burlington, ontario l7l 5m4 canada phone: +1 (905) 632-2996 fax: +1 (905) 632-2055 e-mail: corporate@gennum.com www.gennum.com caution electrostatic sensitive devices do not open packa g es or handle except at a static-free workstation 6.6 ordering information part number package temperature range g s2988 g s2988-ine3 16-pin qfn -40c to 85c g s2988 g s2988-inte3 16-pin qfn 250pc reel -40c to 85c g s2988 g s2988-inte3z 16-pin qfn 2,500pc reel -40c to 85c

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