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1 of 16 GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 GV8601 adaptive cable equalizer GV8601 www.semtech.com key features ? hdcctv 1.0, hd-sdi (st 292), 3g-sdi (st 424) and sd-sdi (st 259) compliant ? automatic cable equalization ? multi-standard operation from 143mb/s to 2.97gb/s ? small footprint (4mm x 4mm) ? pb-free and rohs compliant ? manual bypass (useful for low data rates with slow rise/fall times) ?performance optimi zed for 1.485gb/s (hdcctv/hd-sdi) and 2.970gb/s ? differential outputs support dc coupling to 3.3v and 2.5v cml logic ? typical equalized length of belden 1694a cable: 140m at 2.97gb/s ? typical equalized length of belden 543945 hdcctv 1.1 reference cable: 150m at 1.485gb/s ? typical equalized length of belden 543945 hdcctv 1.1 reference cable: 330m at 270mb/s (hd-vlc?) ?50 differential output (internal 50 pull-ups) ? single 3.3v power supply operation ? operating temperature range: -20 c to +85 c applications ?digital video recorders (dvr) ? video capture cards ? video monitors and displays ? video mixers and switchers ? video servers ?camcorders ? distribution amplifiers ?repeaters description the GV8601 is a high-speed bicmos integrated circuit designed to equalize and restore signals received over 75 coaxial cable. the GV8601 is designed to support hdcctv 1.0, st 292 and st 424, and is optimized for performance at 1.485gb/s and 2.97gb/s serial data. the GV8601 features dc restorat ion to compensate for the dc content of hdcctv 1.1 pathological test patterns. the differential outputs can be dc-coupled to industry-standard 3.3v and 2.5v cml logic using the cmset pin. power consumption is typi cally 195mw using a 3.3v power supply. the GV8601 is lead-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogenous subcomponents are rohs compliant. GV8601 functional block diagram equalizer output agc sdi mute sdo bypass cd sdi sdo agc agc cmset carrier detect mute dc restore
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 2 of 16 revision history contents key features ................................................................................................................... .....................................1 applications................................................................................................................... ......................................1 description.................................................................................................................... .......................................1 revision history ............................................................................................................... ..................................2 1. pin out..................................................................................................................... ..........................................3 1.1 GV8601 pin assignment ..................................................................................................... ...........3 1.2 GV8601 pin descriptions ................................................................................................... ............3 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 serial digital inputs ..................................................................................................... ....................8 4.2 cable equalization ........................................................................................................ ...................8 4.3 serial digital outputs .................................................................................................... ..................8 4.4 mute and carrier detect ................................................................................................... ..............9 4.5 cmset operation ........................................................................................................... ..................9 5. application information ..................................................................................................... ..................... 11 5.1 high gain adaptive cable equalizers .................................................................................... 11 5.2 pcb layout ................................................................................................................ ....................... 11 5.3 typical application circuit ............................................................................................... ......... 12 6. package & ordering information .............................................................................................. ............ 13 6.1 package dimensions ........................................................................................................ ............. 13 6.2 packaging data ............................................................................................................ ................... 13 6.3 recommended pcb footprint .. ........... ........... ........... ........... ........... ........... ........... ........... ....... .. 14 6.4 marking diagram ........................................................................................................... ................ 14 6.5 solder reflow profiles .................................................................................................... .............. 15 6.6 ordering information ...................................................................................................... ............. 15 version eco pcn date changes and/or modifications 1 010001 C november 2012 c hanged moisture s ensitivity level to 1 in s e c tion 6.2 . 0 158552 C s eptember 2012 new do c ument.
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 3 of 16 1. pin out 1.1 GV8601 pin assignment figure 1-1: g v8601 pin out 1.2 GV8601 pin descriptions 5 6 78 1 6 15 14 13 sdi 1 2 3 4 sdi sdo sdo 12 11 10 9 vee_a vee_a groun d pa d ( b ottom of packa g e) agc bypass nc vee_d cmset vcc_a cd mute vcc_d gv8 6 01 1 6 -pin qfn (top view) agc table 1-1: GV8601 pin descriptions pin number name timing ty p e description 1 vee_a analog power most negative power supply for analog c ir c uitry. c onne c t to g nd. 2, 3 s di, s di analog input s erial digital differential input. 4 vee_a analog power most negative power supply for analog c ir c uitry. c onne c t to g nd. 5, 6 a gc , a gc analog C external a gc c apa c itor. c onne c t pin 5 and pin 6 together as shown in the typi c al appli c ation c ir c uit on page 12 . 7bypa ss not s yn c hronous input for c es the e q ualizing and d c re s tore stages into bypass mode when hi g h. no e q ualization o cc urs in this mode. (internal pull-down). 8n c CCno c onne c t. 9 c m s et not s yn c hronous input c ontrol s i g nal input levels are lv c mo s /lvttl c ompatible. (3.3v tolerant) c ontrols output c ommon mode level. (internal pull-down). s ee s e c tion 4.5 .
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 4 of 16 10, 11 s do , s do analog output e q ualized serial digital differential output. 12 vee_d analog power most negative power su pply for the digital c ir c uitry and output buffer. c onne c t to g nd. 13 v cc _d analog power most positive power supply for the digital i/o pins of the devi c e. c onne c t to +3.3v d c . 14 mute not s yn c hronous input c ontrol s i g nal input levels are lv c mo s /lvttl c ompatible. (3.3v tolerant) c ontrols output behaviour on s do and s do. (internal pull-down). s ee s e c tion 4.4. 15 c d not s yn c hronous output s tatu s s i g nal output s ignal levels are lv c mo s /lvttl c ompatible. indi c ates the presen c e of an input signal. s ee s e c tion 4.4. 16 v cc _a analog power most positive power su pply for the analog c ir c uitry of the devi c e. c onne c t to +3.3v d c . C c enter pad C power internally bonded to vee_a. table 1-1: GV8601 pin descriptions (continued) pin number name timing ty p e description
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 5 of 16 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics parameter value s upply voltage -0.5v to +3.6v d c input e s d voltage (hbm) 5kv 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 -20 c to +85 c fun c tional temperature range -40 c to +85 c s older reflow temperature 260 c table 2-1: dc electrical characteristics v cc = 3.3v 5%, t a = -20 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes s upply voltage v cc C 3.135 3.3 3.465 v C power c onsumption p d t a = 25 c C 195 250 mw C s upply c urrent i s t a = 25 c C59CmaC output c ommon mode voltage v c mout t a = 25 c C v c m s et - v s do /2 Cv1 input c ommon mode voltage v c min t a = 25 c C1.8CvC c d output voltage v c d (oh) c arrier not present 2.4 C C v C v c d (ol) c arrier present C C 0.4 v C mute input voltage re q uired to for c e outputs to mute v mute min to mute 2.0 C C v C mute input voltage re q uired to for c e outputs a c tive v mute max to a c tivate CC0.8vC
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 6 of 16 2.3 ac electrical characteristics table 2-2: ac electrical characteristics v cc = 3.3v 5%, t a = -20 c to +85 c , unless otherwise shown parameter symbol conditions min ty p max units notes s erial input data rate dr s do C 143 C 2970 mb/s C input voltage s wing v s di t a =25 c , differential, 270mb/s and 1.485 g b/s 720 800 950 mv p-p 1 t a =25 c , differential, 2.97 g b/s 720 800 880 mv p-p 1 output voltage s wing v s do 100 load, t a =25 c , differential 680 800 900 mv p-p C output jitter of various c able lengths and data rates C 2.97 g b/s belden 1694a: 0-120m C C 0.25 ui 2, 5 C 2.97 g b/s belden 1694a: 120-140m C 0.3 C ui 3, 5 C 1.485 g b/s belden 1694a: 0-160m C C 0.25 ui 2, 5 C 1.485 g b/s belden 1694a: 160-200m C 0.2 C ui 3, 5 C 270mb/s belden 1694a: 0-400m CC0.2ui2, 5 output rise/fall time C 2.97 g b/s & 1.485 g b/s 20% - 80% 35 65 90 ps C mismat c h in rise/fall time C C C C 30 ps C duty c y c le distortion C C C C 30 ps C overshoot C C C C 10 % C input return loss C C 15 21 C db 4 input resistan c e C single ended C 1.9 C k C input c apa c itan c e C single ended C 1.3 C pf C output resistan c e C single ended C 50 C C note s : 1. 0m cable length. 2. all parts are production tested. in order to guarant ee jitter over the full ra nge of specification (v cc = 3.3v 5%, t a = -20c to +85c, and 720-880mv launch swing from the sd i cable driver) the reco mmended applications circuit must be used. 3. based on characterization da ta using the recommended applications circuit, at v cc = 3.3v, t a = 25c and 800mv launch swing from the sdi cable driver. 4. tested on a semtech evaluation board from 5mhz to 3ghz.
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 7 of 16 3. input/output circuits figure 3-1: input e q uivalent c ir c uit figure 3-2: output c ir c uit 3k 3. 6 k 3k 3. 6 k rc sdi sdi 50 50 sdo sdo figure 3-3: mute and bypa ss c ir c uits figure 3-4: c d c ir c uit mute, bypass cd
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 8 of 16 4. detailed description the GV8601 is a high-speed bicmos ic designed to equalize serial digital video signals. the GV8601 can equalize 3gb/s, hdcctv/hd-sdi and sd-sdi se rial digital signals, and will typically equalize 150m of belden 543945 hdcctv 1.1 re ference cable at 1.485gb/s and 140m of belden 1694a cable at 2.970gb/s. when used for hd-vlc? applications at 270mb/s, the GV8601 will typica lly equalize signals over 330m of belden 543945. the GV8601 is powered from a single +3.3v po wer supply and cons umes approximately 195mw of power. 4.1 serial digital inputs the serial data signal may be connected to the input pins (sdi/sdi ) in either a differential or single ended configuration. ac coupling of the inputs is recommended, as the sdi and sdi inputs are internally biased at approximately 1.8v. 4.2 cable equalization the input signal passes through a variable gain equalizing stage, whose frequency response closely matches the inverse of the cable loss characteristic. in addition, the variation of the frequency response with control voltage imitates the variation of the inverse cable loss characteristic with cable length. the edge energy of the equalized signal is monitored by a detector circuit which produces an error signal corresponding to the difference between the desired edge energy and the actual edge energy. this error signal is integrated by both an internal and an external agc filter capacitor providing a st eady control voltage fo r the gain stage. as the frequency response of the gain stage is automatically varied by the application of negative feedback, the edge energy of the equalized signal is kept at a constant level which is representative of the original edge energy at the transmitter. the equalized signal is also dc restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of shifts due to ac coupling. 4.3 serial digital outputs the digital output signals have a nominal voltage of 800mv pp differential, or 400mv pp single-ended when terminated with 50 as shown in figure 4-1 .
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 9 of 16 figure 4-1: typi c al output voltage levels (for 3.3v c ommon mode) 4.4 mute and carrier detect the GV8601 includes a mute inpu t pin that allows the applic ation interface to mute the serial digital output at any time. set the mute pin high to mute sdo and sdo . in this case, the outputs will mute regardless of the setting of the bypass pin. a carrier detect output pin (cd ) indicates the presence of a valid signal at the input of the GV8601. 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. note 1: cd will only detect loss of carrier for data rates greater than 19mb/s. the cd output pin may be connected directly to the mute input pin to enable automatic muting of the GV8601 when no valid input signal has been detected. 4.5 cmset operation the GV8601 has a selectable output common mode level. this is usef ul when interfacing to chips that can accept 2.5v input common mode levels. in these cases, ac coupling can be avoided by selecting the correct output common mode. 50 50 sdo sdo +200mv -200mv v cm = 2.9v typical +200mv -200mv v cm = 2.9v typical table 4-1: mute input table mute function 0 s do and s do operate normally 1 s do and s do are for c ed to a steady state (either high or low) table 4-2: cd output table cd input status 0 valid input on s di, s di pins 1 input is not valid
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 10 of 16 note 1: see section 2.2 for output common mode voltage specification. note 2: when the GV8601 is used in a gv8501 de sign, the cmset pin will be tied to ground (vee_d on gv8501). therefore, the output common mode will be permanently set to 3.3v. table 4-3: cmset output table cmset output common mode voltage level 0 the output c ommon mode will be c ompatible with 3.3v c ml 1 the output c ommon mode will be c ompatible with 2.5v c ml
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 11 of 16 5. application information 5.1 high gain adaptive cable equalizers in order to continue to extend the cable length that an equalizer will remain operational over, 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 hdcctv and smpte compliant serial video streams. the GV8601 has an increase in gain over th e gv8501 at critical 1.5gb/s and 3gb/s frequencies. small levels of si gnal 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 component layout when designing high-speed serial digital interfaces. 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: ? pcb trace width for 3gb/s rate signals is closely matched to smt component width to minimize reflections due to change in trace impedance. ? the pcb ground plane is removed un der the GV8601 input components to minimize parasitic capacitance. ? the pcb ground plane is removed un der the GV8601 output components to minimize parasitic capacitance. ? high speed traces are curved to minimize impedance changes.
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 12 of 16 5.3 typical application circuit figure 5-1: g v8601 typi c al appli c ation c ir c uit gv8 6 01 sdi cd sdi vee_d mute vcc_d agc bypass vee_a note: all resistors in ohms, capacitors in fara d s, an d in d uctors in henrys, unless otherwise note d . * value d epen d ent on layout vee_a agc vcc_a sdo sdo cmset 10n 1 10n sdo 4.7 4.7 + + sdo cd mute vcc bypass 470n 6 .2n* 75 sdi 1 75 1 37.4 vcc 4 5 6 2 3 8 7 1 6 12 13 11 14 15 9 10 cmset nc
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 13 of 16 6. package & ordering information 6.1 package dimensions 6.2 packaging data 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 pin #1 identification 0.4500 parameter value pa c kage type 4mm x 4mm 16-pin qfn pa c kage drawing referen c ejede c m0220 moisture s ensitivity level 1 jun c tion to c ase thermal resistan c e, j- c 31.0 c /w jun c tion to air thermal resistan c e, j-a (at zero airflow) 43.8 c /w psi, 11.0 c /w pb-free and roh s c ompliant yes
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 14 of 16 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. 6.4 marking diagram 0.35 0.55 2.76 3.70 2.76 3.70 note: all dimensions are in millimeters. 0.65 c enter pad GV8601 xxxxe3 yyww pin 1 id xxxx - last 4 digits (excluding decimal) of sap batch assembly (fin) as listed on packing slip. e3 - pb-free & green indicator yyww - date code
GV8601 adaptive cable equalizer final data sheet rev. 1 november 2012 15 of 16 6.5 solder reflow profiles the GV8601 is available in a pb-free package. it is re commended that the pb-free package be soldered with pb-free paste using the reflow profile shown in figure 6-1 . figure 6-1: maximum pb-free s older reflow profile 6.6 ordering information 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 g v8601 g v8601-ine3 16-pin qfn -40 c to 85 c
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