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1 of 25 proprietary & confidential GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs GS3441 www.semtech.com key features ? smpte st 424, smpte st 292 and smpte st 259 compliant ?automatic cable equalization ? multi-standard operation from 125mb/s to 2.97gb/s ? performance op timized for 270mb/s, 1.485gb/s and 2.97gb/s. typical equalized length of belden 1694a cable up to: ? 210m at 2.97gb/s ? 300m at 1.485gb/s ? 550m at 270mb/s ? supports dvb-asi at 270mb/s ? supports madi at 125mb/s ? dual, independently-controlled outputs ? manual bypass (useful for low data rates with slow rise/fall times) ? programmable carrier detect with squelch threshold adjustment ? cable length indicator (cli) output; varies monotonically with input cable length ? automatic power-down on loss of signal ? standby power <35 mw (typical) ? differential outputs support dc coupling from 1.2v to 3.3v cml logic ? option to compensate for 6db flat attenuation prior to input of device ? selectable output de-emphasis: 2db, 4db and 6db ? standard eia/jedec logic control and status signal levels ? single 3.3v power supply operation ? 180mw (one output enabled), 212mw (both outputs enabled) typical power consumption ? wide operating temperature range of -40oc to +85oc ? small footprint qfn package (4mm x 4mm) ? pb-free and rohs compliant applications ? smpte st 424, smpte st 292 and smpte st 259 coaxial cable serial digital interfaces description the GS3441 is a high-speed bi cmos device designed to equalize and restore signals received over 75 coaxial cable. the device is designed to support smpte st 424, smpte st 292 and smpte st 25 9, and is op timized for performance at 270mb/s, 1.485gb/s and 2.97gb/s. the GS3441 features dc restoration to compensate for the dc content of smpte pathological signals. the carrier detect output pin (cd ) indicates whether an input signal has been detected. it can be connected directly to the sleep pin to enable automatic power-down upon loss of carrier. a voltage programmable threshol d, set via the sq_adj pin, forces cd high when the input signal amplitude falls below the threshold. this allows the GS3441 to distinguish between low-amplitude sdi signals and noise at the input of the device. the equalizing and dc restore stages are disengaged and no equalization occurs when the bypass pin is high. setting the bypass pin high is useful for signals launched at the signal source with low data rates and/or slow rise/fall times. the GS3441 features a gain se lection pin (gain_sel) which can be used to compensate for 6db flat attenuation prior to input of the device. the differential outputs can be dc-coupled to semtech?s reclockers and cable drivers, as well as industry-standard 1.2v, 1.8v, 2.5v and 3.3v cml logic by changing the voltage applied to the vcc_o pin. in general, dc-coupling to any termination voltage between 1.2v and 3.3v is supported.
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 2 of 25 proprietary & confidential www.semtech.com description (continued) the GS3441 also features programmable output de-emphasis with three, user-selectable operating levels to support long pcb traces at the output of the device. the device comes in a 24-p in, 4mm x 4mm qfn package and is footprint compatib le with semtech?s gs2993 equalizer. power consumption of the GS3441 is typically 212mw when dc-coupled at 1.2v. the GS3441 is pb-free, and th e encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous subcomponents are rohs compliant. GS3441 functional block diagram equalizer output 1 agc sdi sleep ddo1 bypass cd sdi ddo1 agc agc op1_en sq_adj squelch adjust carrier detect mute dc restore output 2 ddo2 ddo2 op2_en vee_o1 vee_o2 op2_ctl op1_ctl vcc_o1 vcc_o2 cli vcc_a vee_a gain_sel
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 3 of 25 proprietary & confidential www.semtech.com contents 1. pin out..................................................................................................................... ..........................................4 1.1 GS3441 pin assignment ..................................................................................................... ............4 1.2 GS3441 pin descriptions ................................................................................................... .............4 2. electrical characteristics .................................................................................................. ..........................7 2.1 absolute maximum ratings .................................................................................................. ........7 2.2 dc electrical characteristics ...... ....................................................................................... ...........7 2.3 ac electrical characterist ics ............................................................................................. ........ 10 3. input/output circuits ....................................................................................................... ........................ 12 4. detailed description........................................................................................................ .......................... 14 4.1 serial digital inputs ..................................................................................................... ................. 14 4.2 automatic (adaptive) cable equalization ............... .............................................................. 14 4.3 differential digital data outputs ......................................................................................... .... 14 4.4 programmable squelch adjust (sq_adj) .............................................................................. 15 4.5 carrier detect, sleep, and auto-sleep .................................................................................... 1 5 4.6 gain_sel .................................................................................................................. ....................... 16 4.7 adjustable output swing, de-emphasis and mute ............................................................ 16 4.8 cable length indicator (cli) .............................................................................................. ........ 18 5. application information ..................................................................................................... ..................... 19 5.1 high gain adaptive cable equalizers .................................................................................... 19 5.2 pcb layout ................................................................................................................ ....................... 19 5.3 typical application circuit ............................................................................................... ......... 20 6. package & ordering information .............................................................................................. ............ 21 6.1 package dimensions ........................................................................................................ ............. 21 6.2 packaging data ............................................................................................................ ................... 21 6.3 recommended pcb footprint .. ........... ........... ........... ........... ........... ........... ........... ........... ....... .. 22 6.4 marking diagram ........................................................................................................... ................ 22 6.5 solder reflow profiles .................................................................................................... .............. 23 6.6 ordering information ...................................................................................................... ............. 23
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 4 of 25 proprietary & confidential www.semtech.com 1. pin out 1.1 GS3441 pin assignment figure 1-1: gs 3441 pin out 1.2 GS3441 pin descriptions 5 6 78 16 15 14 13 1 2 3 4 12 11 10 9 17 18 19 20 21 22 23 24 agc gain_sel vee_a vee_o1 GS3441 24-pin qfn (top view) ddo1 ddo1 vee_o2 ddo2 ddo2 sq_adj bypass agc ground pad (bottom of packa g e) sdi sdi vcc_o1 sleep vcc_a cd vcc_o2 op2_ctl op2_en cli op1_ctl op1_en table 1-1: GS3441 pin descriptions pin number name timing ty p e description 1v cc _a analog power most positive power supply c onne c tion for the input b uffer, c ore an d c ontrol c ir c uits. c onne c t to +3.3v d c . 2 vee_a analog power most negative power supply c onne c tion for the input b uffer, c ore an d c ontrol c ir c uits c onne c t to g nd. 3, 4 s di, s di analog input s erial d igital d ifferential input. 5 g ain_ s el not s yn c hronous input input s ensitivity c ontrol. please refer to the input logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. this pin is a 2.5v input that is tolerant to 3.3v levels. when hi g h, the d evi c e c ompensates for an a dd itional 6 d b of loss a c ross the entire operating b an d . this pin has an internal pull- d own resistor.
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 5 of 25 proprietary & confidential www.semtech.com 6, 7 a gc , a gc analog ? external a gc c apa c itor c onne c tion. 8bypa ss not s yn c hronous input c ore bypass c ontrol. please refer to the input logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. this pin is a 2.5v input that is tolerant to 3.3v levels. for c es the e q ualizer an d d c -restore stages into bypass mo d e when hi g h. no e q ualization o cc urs in this mo d e. this pin has an internal pull- d own resistor. 9 s q_ad j analog input sq uel c h threshol d a d just. a d justs the input signal amplitu d e threshol d of the c arrier d ete c t fun c tion. the serial d ata output of the d evi c e c an b e mute d when the serial d ata input signal amplitu d e is too low b y c onne c ting the c d an d opn_ c tl pins via suita b le resistor networks (see figure 4-2 an d figure 4-3 ). this pin has an internal pull- d own resistor. note: the s q_ad j fun c tion is only availa b le when the d evi c e is not in auto-sleep mo d e. referen c e s e c tion 4.5 for more d etail. 10 op2_en ? input output 2 ena b le. please refer to the input logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. when hi g h, output 2 is operational. when low, output 2 is powere d - d own an d the outputs are b oth at v cc _o2. this pin has an internal pull- d own resistor. 11 op2_ c tl not s yn c hronous input c ontrols the output s wing, de-emphasis an d mute features of the ddo/ddo outputs for output 2. when this pin is c onne c te d to g nd, the output swing is 850mv pp d with no d e-emphasis. with this pin c onne c te d to a 2.5v, the output is mute d . interme d iate voltages an d fun c tions are shown in ta b le 4-5 . these voltages c an b e a c hieve d as shown in figure 4-2 an d figure 4-3 . this pin has an internal pull- d own resistor. 12 v cc _o2 analog power most positive power supply c onne c tion for the output b uffer for output 2. c onne c t to 1.2 - 3.3v d c . 13, 14 ddo 2 , ddo2 analog output s erial d igital d ifferential output 2. 15 vee_o2 analog power most negative power supply c onne c tion for the output b uffer for output 2. c onne c t to g nd. 16 vee_o1 analog power most negative power supply c onne c tion for the output b uffer for output 1. c onne c t to g nd. 17, 18 ddo 1 , ddo1 analog output s erial d igital d ifferential output 1. table 1-1: GS3441 pin descriptions (continued) pin number name timing ty p e description
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 6 of 25 proprietary & confidential www.semtech.com 19 v cc _o1 analog power most positive power supply c onne c tion for the output b uffer for output 1. c onne c t to 1.2 - 3.3v d c . 20 op1_ c tl not s yn c hronous input c ontrols the output s wing, de-emphasis an d mute features of the ddo/ddo outputs for output 1. when this pin is c onne c te d to g nd, the output swing is 800mv pp d with no d e-emphasis applie d to the output signal. with this pin c onne c te d to the 2.5v, the output is muted. interme d iate voltages an d fun c tions are shown in ta b le 4-5 . these voltages c an b e a c hieve d as shown in figure 4-2 an d figure 4-3. this pin has an internal pull- d own resistor. 21 op1_en ? input output 1 ena b le. please refer to the input logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. when hi g h, output 1 is operational. when low, output 1 is powere d - d own an d the outputs are b oth at v cc _o1. this pin has an internal pull-up resistor. 22 c li ? output c a b le length in d i c ator 23 s leep not s yn c hronous input s leep c ontrol. please refer to the input logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. this pin is a 2.5v input that is tolerant to 3.3v levels. when hi g h the part is powere d - d own ex c ept for the c arrier dete c t fun c tion. this pin may b e c onne c te d d ire c tly to the c d pin to automati c ally put the d evi c e to sleep (low-power operation) on loss of c arrier. this pin has an internal pull- d own resistor. note: when s leep is c onne c te d to c d for automati c power re d u c tion on loss of c arrier, the s q_ad j pin will not mo d ify the c d threshol d . the c d threshol d will revert to the d efault value use d when s q_ad j is pulle d low. 24 c d not s yn c hronous output c arrier dete c t s tatus output. please refer to the output logi c parameter in the d c ele c tri c al c hara c teristi c s ta b le for logi c level threshol d an d c ompati b ility. this pin is a 2.5v output. in d i c ates presen c e of an input signal. when the c d pin is low, a signal has b een d ete c te d at the input. when this pin is hi g h, it in d i c ates loss of input signal. ? c enter pa d ?power internally b on d e d to vee_a. c onne c t to g nd with at least 5 vias. table 1-1: GS3441 pin descriptions (continued) pin number name timing ty p e description
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 7 of 25 proprietary & confidential www.semtech.com 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics table 2-1: absolute maximum ratings parameter value s upply voltage - c ore/output driver -0.5v to +3.6v d c input e s d voltage (hbm) 5kv s torage temperature range -50 c to 125 c input voltage range (any input) -0.3 to (v cc _a +0.3)v operating temperature range -40 c to +85 c s ol d er reflow temperature 260 c note: a b solute maximum ratings are those values b eyon d whi c h d amage may o cc ur. fun c tional operation outsi d e of the ranges shown in ta b le 2-1 is not implie d . table 2-2: dc electrical characteristics v cc = +3.3v 5%, t a = -40 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes s upply voltage - c ore v cc _a ? 3.135 3.3 3.465 v ? s upply voltage - output driver v cc _o ? 1.14 1.2 1.26 v 1 ? 2.375 2.5 2.625 v 1 ? 3.135 3.3 3.465 v 1
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 8 of 25 proprietary & confidential www.semtech.com power c onsumption p d v cc _o1 = 1.2v, v cc _o2 = off, v ddo1 = v ddo2 = 425mv pp d ? 180 218 mw 2 v cc _o1 = 1.2v, v cc _o2 = 1.2v, v ddo1 = v ddo2 = 425mv pp d ? 212 260 mw 2 v cc _o1 = 1.2v, v cc _o2 = 1.2v, v ddo1 = v ddo2 = 850mv pp d ? 237 290 mw 2 v cc _o1 = 2.5v, v cc _o2 = 2.5v, v ddo1 = v ddo2 = 850mv pp d ? 245 299 mw 2 v cc _o1 = 3.3v, v cc _o2 = off, v ddo1 = v ddo2 = 425mv pp d ? 202 244 mw 2 v cc _o1 = 3.3v, v cc _o2 = off, v ddo1 = v ddo2 = 850mv pp d ? 240 292 mw 2 v cc _o1 = 3.3v, v cc _o2 = 3.3v, v ddo1 = v ddo2 = 425mv pp d ? 258 316 mw 2 v cc _o1 = 3.3v, v cc _o2 = 3.3v, v ddo1 = v ddo2 = 850mv pp d ? 325 395 mw 2 s upply c urrent - c ore i s both outputs on ? 53 59 ma 3 s upply c urrent - output driver (one output ena b le d ) i output driver v cc _o1 & v cc _o2 = 3.3v, v ddo1 = v ddo2 = 425mv pp d ?1014ma? v cc _o1 & v cc _o2 = 3.3v, v ddo1 = v ddo2 = 850mv pp d ?1924ma? input c ommon mo d e voltage v c min ? 1.62 1.71 1.80 v ? table 2-2: dc electrical characteristics (continued) v cc = +3.3v 5%, t a = -40 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 9 of 25 proprietary & confidential www.semtech.com c d output voltage v c d (oh) c arrier not present 2.0 ? ? v ? v c d (ol) c arrier present ? ? 0.4 v ? input voltage - digital pins v g ain_ s el v bypa ss v s leep v op1_en v op2_en minimum to assert 1.7 ? ? v 4 maximum to d e-assert ??0.7v 4 notes: 1. v cc _o operates from 1.2v through 3.3v (5%). 2. de-emphasis off. 3. an additional 6ma when de-empha sis is enabled (d ual-output mode). 4. digital input pins are 2.5v but 3.3v tolerant. table 2-2: dc electrical characteristics (continued) v cc = +3.3v 5%, t a = -40 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 10 of 25 proprietary & confidential www.semtech.com 2.3 ac electrical characteristics table 2-3: ac electrical characteristics v cc = +3.3v 5%, t a = -40 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes s erial input d ata rate dr s do ? 125 ? 2970 m b /s 1 input voltage s wing v s di differential, 270m b /s an d 1.485 gb /s 720 800 950 mv pp d 2 differential, 2.97 gb /s 720 800 880 mv pp d 2 output voltage s wing v ddo 100 loa d , d ifferential, op_ c tl set for high swing 700 850 1000 mv pp d ? 100 loa d , d ifferential, op_ c tl set for low swing 350 425 500 mv pp d ? output j itter of various c a b le lengths an d data rates ? 2.97 gb /s bel d en 1694a: 0-120m ? ? 0.25 ui 3 , 4 , 5 ? 2.97 gb /s bel d en 1694a: 120-150m ??0.3ui 3 , 4 , 5 ? 2.97 gb /s bel d en 1694a: 150-170m ? ? 0.45 ui 3 , 4 , 5 ? 2.97 gb /s bel d en 1694a: 170-190m ? ? 0.55 ui 3 , 4 , 5 ? 2.97 gb /s bel d en 1694a: 190-210m ?0.55? ui 3 , 4 , 5 ? 1.485 gb /s bel d en 1694a: 0-200m ??0.2ui 3 , 4 , 5 ? 1.485 gb /s bel d en 1694a: 200-260m ??0.3ui 3 , 4 , 5 ? 1.485 gb /s bel d en 1694a: 260-300m ?0.3? ui 3 , 4 , 5 ? 270m b /s bel d en 1694a: 0-300m ? 0.1 0.15 ui 3 , 4 , 5 ? 270m b /s bel d en 1694a: 300-500m ? ? 0.25 ui 3 , 4 , 5 ? 270m b /s bel d en 1694a: 500-550m ?0.25? ui 3 , 4 , 5 output rise/fall time ? 2.97 gb /s & 1.485 gb /s 20% - 80% ?75?ps ? ? 270m b /s (see s e c tion 4.8 ) 20% - 80% ? 150 ? ps ? mismat c h in rise/fall time ? ? ? ? 30 ps ? duty c y c le d istortion ? s d/hd/3 g ??30ps? overshoot ? ? ? ? 10 % ?
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 11 of 25 proprietary & confidential www.semtech.com input return loss ? 5mhz - 1.485 g hz 15 ? ? d b? ?1.485 g hz - 2.97 g hz 10 ? ? d b? input resistan c e?single-en d e d ?1.9?k ? input c apa c itan c e?single-en d e d ?1.3? pf ? output resistan c e?single-en d e d ?50? ? notes: 1. device performance is optimized for standard data rates (sd = 270mb/s, hd = 1.485gb/s, 3g = 2.970gb/s) 2. 0m cable length. 3. all parts are production tested. in order to guarant ee jitter over the full range of specification (v cc_a = 3.3v 5%, t a = -40c to +85c, and 720-880mv pp launch swing from the sdi cable driver) the re commended applications circuit must be used. 4. based on validation data using the re commended applications circuit, at v cc_a = 3.3v, t a = -40c to +85c and 800mv pp launch swing from the sdi cable driver. 5. gain_sel = 0 table 2-3: ac electrical characteristics (continued) v cc = +3.3v 5%, t a = -40 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 12 of 25 proprietary & confidential www.semtech.com 3. input/output circuits figure 3-1: input e q uivalent c ir c uit figure 3-2: s q_ad j e q uivalent c ir c uit figure 3-3: output c ir c uit 2. 6 25k rc sdi sdi rc 2k 2k 2k vcc_a vcc_a vcc_a sq_adj 82.4k + - vcc_a 50 50 ddo ddo vcc_o vcc_o vcc_o
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 13 of 25 proprietary & confidential www.semtech.com figure 3-4: s leep, bypa ss , op2_en an d g ain_ s el c ir c uits figure 3-5: op1_en c ir c uit figure 3-6: c d c ir c uit sleep, bypass, op2_en, gain_sel 100k vcc_a vcc_a op1_en 100k vcc_a vcc_a cd internal 2.5v vcc_a figure 3-7: op1_ c tl c ir c uit figure 3-8: op2_ c tl c ir c uit vcc_a internal reference internal reference op1_ctl internal circuitry 1m vcc_a vcc_a internal reference internal reference op2_ctl internal circuitry 100k vcc_a
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 14 of 25 proprietary & confidential www.semtech.com 4. detailed description the GS3441 is a high-speed bicmos ic design ed to equalize seri al digital signals. the GS3441 can equalize 3gb/s, hd and sd se rial digital signals, and will typically equalize 210m of belden 1694a cable at 2.97gb/s, 300m at 1. 485gb/ s and 550m at 270mb/s. when dc coupling the output of a device to a 1.2v cml load, the GS3441 typically consumes approximately 180mw (o ne output enabled), 212mw (both outputs enabled). the GS3441 features dual, indepe ndently-controlled outputs, and can be operated from a single +3.3v dc power supply. 4.1 serial digital inputs the received serial data signal is connected to the input pins (sdi/sdi ) in either a differential or single-ended configuration. ac-coupling of the inputs is recommended, because the sdi and sdi inputs are internally biased to approximately 1.87v. 4.2 automatic (adaptiv e) cable equalization the input signal passes through a variable gain equalizing stage, whose frequency response closely matches the inverse of the cable (belden 1694a) loss charac teristic. in addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length ensuring that the correct amount of gain is automatically applied to the input signal for any cable length within the supported ranges. the equalized signal is dc-restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to ac-coupling. 4.3 differential digital data outputs the digital data output signals have a nominal output voltage swing of either 850mv ppd or 425mv ppd , as set by the op1_ctl pin for ddo1 and the op2_ctl pin for ddo2. table 4-1 shows the typical output common mode voltage levels related to the two output swing options and the chosen coupling (dc vs. ac). table 4-1: typical common mode output voltage levels supply voltage (vcc_o) 425mv ppd swing (dc-coupled output) 425mv ppd swing (ac-coupled output) 850mv ppd swing (dc-coupled output) 850mv ppd swing (ac-coupled output) 3.3v 3.2v 3.1v 3.1v 2.9v 2.5v 2.4v 2.3v 2.3v 2.1v 1.8v 1.7v 1.6v 1.6v 1.4v 1.2v 1.1v 1.0v 1.0v 0.8v
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 15 of 25 proprietary & confidential www.semtech.com 4.4 programmable sque lch adjust (sq_adj) the GS3441 features a programmable squelch adjust (sq_adj) threshold. this feature can be useful in applications where there are multiple input channels using the GS3441 and the maximum gain can be limited to avoid crosstalk. the sq_adj pin acts to change the threshold of the carrier detect (cd ) pin, through voltage level variances. when the input sign al drops below a certain threshold set by sq_adj, the cd pin will be driven high, indicating th at there is not a valid input signal. in applications where programmable squelch adjust is not required, the sq_adj pin can be left unconnected. this feature has been designed for use in a pplications such as routers, where signal crosstalk and circuit noise cause the equalizer to output erroneous data when no input signal is present. the use of a carrier detect function with a fixed internal reference does not solve this problem, since the signal-to-noise ratio on the circuit board could be significantly less than the default signal detection level set by the on-chip reference. note: when using sq_adj to limit th e maximum gain of the GS3441, cd should not be connected to sleep. 4.5 carrier detect, sl eep, and auto-sleep the carrier detect output pin (cd ) indicates the presence of a valid signal at the input of the GS3441. when cd is low, the device has detected a valid input on sdi and sdi . when cd is high, the device has not detected a valid input. the GS3441 includes a sleep input pin, which can be used to put the device into a low-power sleep mode, consuming less than 35mw. in this mode, the outputs are high impedance and will be pulled high by the on-chip termination. set the sleep pin high to place the chip in this low-power state. in this mode, the carrier detect output will still function to facilitate the detection of a valid serial input data signal. auto-sleep is enab led by connecting cd to sleep. when conn ected, the GS3441 will automatically go into low-power sleep mode when there is a loss of serial digital input signal. note 1: cd will only detect loss of carrier for data rate s greater than 19mb/s. note 2: if sq_adj is being used to limit the maximum gain of the device, and the maximum cable length is exceeded when bypass pin is set low, the cd pin will be set high even if a carrier is present. note 3: if the cd pin is connected to the sleep pin, sq_adj must be either left open, or connected to ground. table 4-2: sleep input table sleep function 0the gs 3441 operates normally 1 the gs 3441 enters low-power sleep mo d e. c d output remains vali d
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 16 of 25 proprietary & confidential www.semtech.com 4.6 gain_sel the GS3441 has an option of compensating fo r 6db of flat attenu ation prior to the equalizer. 4.7 adjustable output sw ing, de-emphasis and mute the op1_ctl input pin determines the output swing and de-emphasis settings for the first output (ddo1/ddo1 ), and op2_ctl input pin determines the output swing and de-emphasis settings for the second output (ddo2/ddo2 ). the op1_ctl and op2_ctl pins are both analog inputs, allowing different combinations of output swing, de-emphasis and mute. the possible values are listed in table 4-5 below: when muted, the output swing is set to 425mv ppd and the outputs are latched. table 4-3: cd output table cd input status 0vali d input on s di, s di pins 1 input is not vali d table 4-4: gain_sel input table gain_sel function 0no flat b an d gain is applie d 1 6 d b of flat attenuation will b e c ompensate d b y the d evi c e table 4-5: op1_ctl and op2_ctl functions and levels level swing (mv ppd ) de-emphasis mute voltage (v) 0 850mv pp d off n 0.000 - 0.083 1 850mv pp d 2 d b n 0.234 - 0.394 2 850mv pp d 4 d b n 0.545 - 0.704 3 850mv pp d 6 d b n 0.856 - 1.015 4 425mv pp d off n 1.166 - 1.333 5 425mv pp d 2 d b n 1.484 - 1.644 6 425mv pp d 4 d b n 1.795 - 1.954 7 425mv pp d 6 d b n 2.106 - 2.265 8 425mv pp d n/a y 2.416 - 2.500
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 17 of 25 proprietary & confidential www.semtech.com automatic muting of the output can be enabled by connecting the cd pin to the op1_ctl and op2_ctl pins. if the connection is made directly, as shown in figure 4-1 , the output would be in its default mode (850mv ppd swing with no de-emphasis) when there is signal present. figure 4-1: dire c t loop b a c k to enable automatic muting while the output is configured for other settings, a resistor network should be used between cd and vcc_a. the intermediate voltages of this resistor ladder can set the output to any one of the nine different settings as shown in figure 4-2 and figure 4-3 . in figure 4-2 , automatic muting of the output is established by connecting node 3 to the opx_ctl pin. in th is scenario, the ou tput would be 850mv ppd with 6db of de-emphasis when there is a signal present. in figure 4-3 , the opx_ctl pin is connected to node 4. in this scenario, the output would be 425mv ppd with no de-emphasis when there is a signal present. in both cases, the output would be muted when no carrier is detected. note: when the device is in sleep mode, automatic muting and sq_adj do not function. asserting the sleep pin manually overrides all other functionality. opx_ctl cd figure 4-2: resistor divi d er loop b a c k example #1 (fun c tion level 3 from ta b le 4-5 ) figure 4-3: resistor divi d er loop b a c k example #2 (fun c tion level 4 from ta b le 4-5 ) cd opx_ctl vcc_a 1k 2. 6 k 012345 6 78 levels taps 1k 1k 1k 1k 1k 1k 1k 6 78 levels taps 1k 2. 6 k 1k 1k 1k 1k 1k 1k 1k
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 18 of 25 proprietary & confidential www.semtech.com 4.8 cable length indicator (cli) the GS3441 has a cable length in dicator output. this is an analog voltage in the range of 0v to 3.3v, varying monotonically with the input cable length. see figure 4-4 and table 4-6 below. figure 4-4: c a b le length in d i c ator output note: the cli output voltage is referenced to vcc_a. 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 0 100 200 300 400 500 6 00 cli (v) cable length (m) table 4-6: cable length indicator output cable length (m) 0 40 120 160 180 200 210 260 300 400 500 600 cli (v) 0.54 0.59 0.75 0.91 0.96 1.01 1.09 1.24 1.39 1.59 2.03 2.27
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 19 of 25 proprietary & confidential www.semtech.com 5. application information 5.1 high gain adaptive cable equalizers the GS3441 is a multi-rate adaptive cable equalizer. in or der to continue to extend the cable length that the device can support, it is necessary to have high-gain in the equalizer. a video cable equalizer must provide wide band gain over a range of frequencies in order to accommodate the range of data rates and signal patterns that are present in a smpte compliant serial video stream. small levels of signal or noise present at the input pins of the equalizer may cause chatter at the output. in order to prevent this from happening, particular attention must be paid to board layout. 5.2 pcb layout special attention must be paid to compon ent layout when desi gning serial digital interfaces for hdtv. a 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: ? pcb trace width for 3gb/s rate signals is closely matched to smt component width to minimize reflections due to change in trace impedance. ? high-speed traces are curved to minimize impedance changes. ? cutouts in the inner layers should be used under the GS3441 input and output components to minimize parasitic capacitance. for more detail on this and other layout recommendations, please refer to a guide for designing with gennum?s 3g-sdi equalizers .
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 20 of 25 proprietary & confidential www.semtech.com 5.3 typical application circuit figure 5-1: gs 3441 typi c al appli c ation c ir c uit figure 5-2: gs 3441 alternate appli c ation c ir c uit re c ommen d e d for drop in repla c ement appli c ations vcc_a 75 10nf 1f vcc_o1 1f 6 7 8 24 22 13 5 21 11 10 4 3 23 9 tab 2 1 6 15 12 10nf 17 470nf 20 GS3441 14 37.4 75 1 19 10nf vcc_o2 18 4.7f 4.7nh* tab cd sleep cli op1_en op1_ctl vcc_o1 ddo1 ddo1 vee_o1 vee_o2 ddo2 ddo2 vcc_o2 op2_ctl op2_en sq_adj bypass agc agc gain_sel sdi sdi vee_a vcc_a 4.7f 4.7f 4.7f 4.7nh sdi *value dependent on layout vcc_a 75 10nf 1f vcc_o1 1f 6 7 8 24 22 13 5 21 11 10 4 3 23 9 tab 2 1 6 15 12 10nf 17 470nf 20 GS3441 14 37.4 75 1 19 10nf vcc_o2 18 4.7f 6 .2nh* tab sleep cli op1_en op1_ctl vcc_o1 ddo1 vee_o1 vee_o2 ddo2 vcc_o2 op2_ctl op2_en sq_adj bypass agc gain_sel sdi vee_a vcc_a agc sdi cd ddo2 ddo1 4.7f 4.7f 4.7f sdi *value dependent on layout
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 21 of 25 proprietary & confidential www.semtech.com 6. package & ordering information 6.1 package dimensions 6.2 packaging data 4.00 a b 2.710.14 datum a datum b detail a 0.250.05 0.50 24x 0.10 0.05 c c ab 0.30@45 4.00 0.420.08 2.71 0.14 pin 1 area 2x 2x 0.15 0.15 c c c 0.10 24x 0.08 c c seating plane 0.20 ref 0.900.10 0.02 +0.03 - 0.02 datum a or b terminal tip detail a 0.50 0.50/2 note s : 1. all dimension in mm, angles in degrees dimensioning and toleran c ing c oform to asme y14.5m 1994 2. dimension of lead width applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip (both rows). if the terminal has optional radius on the end of the terminal, the lead width dimension should not be measured in that radius area parameter value pa c kage type 4mm x 4mm 24-pin qfn pa c kage drawing referen c e j ede c m0220 moisture s ensitivity level 1 j un c tion to c ase thermal resistan c e, j- c 31.0 c /w j un c tion to air thermal resistan c e, j-a (at zero airflow) 43.8 c /w psi, 11.0 c /w p b -free an d roh s c ompliant yes
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 22 of 25 proprietary & confidential www.semtech.com 6.3 recommended pcb footprint the center pad should be connected to the most negative power supply plane for analog circuitry in the device (vee_a) by a minimum of 5 vias. note: suggested dimensions only. final dimensions should conform to customer design rules and process optimizations. ideally, the solder mask and paste mask are slightly smaller than the center pad. 6.4 marking diagram 3.68 0.57 0.25 3.68 2.71 2.71 note: all d imensions in mm c enter pa d 0.50 gs 3441 xxxxe3 yyww pin 1 id xxxx - last 4 d igits (ex c lu d ing d e c imal) of s ap bat c h assem b ly (fin) as liste d on pa c king s lip. e3 - p b -free & g reen in d i c ator yyww - date c o d e
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 23 of 25 proprietary & confidential www.semtech.com 6.5 solder reflow profiles the GS3441 is available in a pb-free packag e. it is recommende d that the pb-free package be soldered with pb-free paste using the reflow profile shown in figure 6-1 . figure 6-1: maximum p b -free s ol d er reflow profile 6.6 ordering information appendix - relevant documentation 25c 150c 200c 217c 2 6 0c 250c time temperature 8 min. max 6 0-180 sec. max 6 0-150 sec. 20-40 sec. 3c/sec max 6 c/sec max part number package temperature range gs 3441 gs 3441-ine3 24-pin qfn -40 c to 85 c gs 3441 gs 3441-inte3 24-pin qfn tape & reel (250p c s) -40 c to 85 c gs 3441 gs 3441-inte3z 24-pin qfn tape & reel (2500p c s) -40 c to 85 c document name document identification a g ui d e for designing with g ennum?s 3 g - s di e q ualizers 55280
GS3441 extended reach 3g/hd/sd adaptive cable equalizer with dual outputs final data sheet rev. 1 gendoc-056647 may 2013 24 of 25 proprietary & confidential www.semtech.com revision history version eco pcn date changes and/or modifications 1 012810 ? may 2013 up d ates throughout the d o c ument, an d c onverte d d o c ument to final data s heet. 0 158445 ? s eptem b er 2012 up d ate d d o c ument to the new s emte c h format. remove d tbds from the typi c al appli c ation c ir c uit in figure 5-1 . up d ates throughout the d o c ument. c onverte d d o c ument to preliminary data s heet. f 157289 ? novem b er 2011 remove d the typi c al usages se c tion. e 157162 ? novem b er 2011 up d ate d the d es c riptions for the s q_ad j an d g ain_ s el pins in ta b le 1-1 to in d i c ate that they have internal pull- d own resistors. d 156906 ? s eptem b er 2011 c orre c te d pa c kage dimensions an d or d ering information (24-pin qfn pa c kage). c 156829 ? august 2011 up d ate d power an d c a b le rea c h num b ers in key features , des c ription , d c ele c tri c al c hara c teristi c s , a c ele c tri c al c hara c teristi c s an d detaile d des c ription . b 156166 ? may 2011 up d ate d the c a b le rea c h lengths in key features an d a dd e d more d etail to se c tion 4.7 a d justa b le output s wing, de-emphasis an d mute . a 155974 ? april 2011 new d o c ument.
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