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gs1524 multi-rate sdi adaptive cable equalizer 1 of 16 gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 www.gennum.com key features ? smpte 292m, smpte 344m and smpte 259m compliant ? automatic cable equalization ? multi-standard operation from 143mb/s to 1.485gb/s ? supports dvb-asi at 270mb/s ? manual bypass (useful for low data rates with slow rise/fall times) ? performance op timized for 270mb/s and 1.485gb/s ? typical maximum equalize d length of belden 1694a cable: 140m at 1.485g b/s, 350m at 270mb/s ?50 differential output (with internal 50 pull-ups) ? pb-free and rohs compliant ? cable length indicator for smpte 259m inputs ? output mute based on max cable length adjust or manual override ? single 3.3v power supply operation ? operating temperature range: 0c to +70c applications ? smpte 292m, smpte 344m and smpte 259m coaxial cable serial digital interfaces description the gs1524 is a second-gener ation high-speed bipolar integrated circuit designed to equalize and restore signals received over 75 co-axial cable at data rates from 143mb /s up to 1.485gb/s. the gs1524 is designed to support smpte 292m, smpte 344m and smpte 25 9m, and is optimized for performance at 270mb/s and 1.485gb/s. the gs1524 features dc restoration to compensate for the dc content of smpte pathological test patterns. the gs1524 also incorporat es a cable length indicator (cli) that provides an indication of the amount of cable being equalized for data rates up to 360mb/s. a voltage programmable mute threshold (mcladj) is included to allow muting of the gs1524 output when an approximate selected cable length is reached for smpte 259m signals. this feature a llows the gs1524 to distinguish between low amplitude sd-sdi signals and noise at the input of the device. the cd /mute pin provides an indication of the gs1524 mute status in addition to functioning as a mute control input. the sd outputs of the gs1524 may be forced to a mute state by applying a voltage to the cd /mute pin. power consumption is typically 265mw using a 3.3v power supply. this component and all homogeneous subcomponents are rohs compliant. functional block diagram cable length indicator/adjustor carrier detect mute equalizer dc restore output agc cli cd/mute sdo bypass sdo sdi sdi mcladj
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 2 of 16 revision history contents key features ................................................................................................................... .....................................1 applications................................................................................................................... ......................................1 description.................................................................................................................... .......................................1 revision history ............................................................................................................... ..................................2 1. pin out..................................................................................................................... ..........................................3 1.1 gs1524 pin assignment ..................................................................................................... ............3 1.2 gs1524 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 ....................................................................................................... ...........................8 4. typical performance curves .................................................................................................. ...................9 5. detailed description........................................................................................................ .......................... 13 5.1 serial digital inputs ..................................................................................................... ................. 13 5.2 cable equalization ........................................................................................................ ................ 13 5.3 programmable mute output & cable length indicator .................................................... 14 5.4 mute and carrier detect ................................................................................................... ........... 14 6. application information ..................................................................................................... ..................... 15 6.1 pcb layout ................................................................................................................ ....................... 15 6.2 typical application circuit ............................................................................................... ......... 15 7. package & order information ................................................................................................. ............... 16 7.1 package dimensions ........................................................................................................ ............. 16 7.2 ordering information ...................................................................................................... ............. 16 version ecr pcn date changes and / or modifications 11 156822 ? august 2011 removed the test level notes from table 2-1: d c electrical c haracteristics and table 2-2: a c electrical c haracteristics . 10 151731 ? april 2009 reorganized figures in input/output c ircuits and typical performance c urves . c larified tape and reel information in ordering information . 9 151339 ? march 2009 updated document format. added 2,500pc reel, and removed leaded parts to section 7.2 ordering information . 8 142111 40438 s eptember 2006 modified format for output cable length jitter data in a c electrical c haracteristics . 7 137165 ? j une 2005 rephrased roh s compliance statement. 6 136565 ? april 2005 updated ? g reen? references to roh s c ompliant.
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 3 of 16 1. pin out 1.1 gs1524 pin assignment figure 1-1: 16-pin s oi c 1.2 gs1524 pin descriptions cli v cc v ee sdi sdi v ee agc+ agc- cd/mute v cc v ee sdo sdo v ee mcladj bypass gs1524 16pin soic top view 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 table 1-1: pin descriptions pin number name ty p e description 1 c li analo g output c able len g th indi c ator. an analog voltage proportional to the cable length connected to the s erial digital input. note: c li is recommended for data rates up to 360mb/s only. 4,5 s di, s di input s erial digital differential input. 7,8 a gc +, a gc - pa ss ive input external a gc capacitor. s hould be set to if 9bypa ss lo g i c input forces the equalizing and d c re s tore stages into bypass mode when hi g h. no equalization occurs in this mode. 10 m c lad j analo g input maximum c able len g th ad j u s t. adjusts the approximate maximum amount of cable to be equalized (from 0m to the maximum cable length). the output is muted (latched to the last state) when the maximum cable length is achieved. note: m c lad j is recommended for data rates up to 360mb/s 12, 13 s do , s do pe c l output equalized serial digital differential output.
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 4 of 16 16 c d /mute bidire c tional mute indi c ator- c ontrol/ c arrier dete c t. output: the output voltage drops to below 1.2v when the carrier is present and the data outputs are active. input: if the c d /mute pin is tied to ground, the data output will never mute and the m c lad j setting is overwritten. if the c d /mute pin is tied to v cc , the data outputs will always mute and the m c lad j setting is overwritten. note: c d /mute is not functional in bypa ss mode. 3, 6, 11, 14 v ee power most negative power supply connection. c onnect to ground. 2, 15 v cc power most positive powe r supply connection. c onnect to +3.3v. table 1-1: pin descriptions (continued) pin number name ty p e description
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 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 500v 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 power dissipation 300mw lead temperature (soldering, 10 sec.) 260 c table 2-1: dc electrical characteristics v cc = 3.3v 5%, t a = 0 c to 70 c , unless otherwise shown parameter conditions symbol min ty p max units notes s upply voltage ? v cc 3.135 3.3 3.465 v 5% power c onsumption t a =25 c p d ? 265 ? mw ? s upply c urrent t a =25 c s ?80 ? ma? output c ommon mode voltage t a =25 c v c mout ?v cc - v s do /2 ? v ? input c ommon mode voltage t a =25 c v c min ?1.75 ? v ? c li d c voltage (0m) t a =25 c ??2.5?v? c li d c voltage (no signal) t a =25 c ??1.9?v? floating m c lad j d c voltage t a =25 c ??1.3?v? m c lad j range t a =25 c ? ? 0.69 ? v ? c d /mute output voltage c arrier not present v c d /mute(oh) 2.6 ? ? v ? c arrier present v c d /mute(ol) ?? 1.2 ? c d /mute input voltage required to force outputs to mute min to mute v c d /mute 3.0 ? ? v ? c d /mute input voltage required to force active max to activate v c d /mute ?? 2.0v ?
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 6 of 16 2.3 ac electrical characteristics figure 2-1: test c ircuit table 2-2: ac electrical characteristics v cc = 3.3v 5%, t a = 0 c to 70 c , unless otherwise shown parameter conditions symbol min ty p max units notes s erial input data rate ? ? 143 ? 1485 mb/s ? input voltage s wing t a =25 c , differential v s di 720 800 950 mv p-p 0m cable length output voltage s wing 50 load, t a =25 c , differential v s do ? 750 ? mv p-p ? output j itter for various c able lengths and data rates 270mb/s belden 1694a: 0-350m belden 8281: 0-280m ??0.2?ui2,4 1.485 g b/s belden 1694a: 0-140m belden 8281: 0-100m ? ? 0.25 ? ui 2,4 output rise/fall time 20% - 80% ? ? 80 220 ps ? mismatch in rise/fall time ? ? ? ? 30 ps ? duty cycle distortion ? ? ? ? 30 ps ? overshoot ? ? ? ? 10 % ? input return loss ? ? 15 ? ? db 1 input resistance single ended ? ? 1.64 ? k ? input c apacitance single ended ? ? 1 ? pf ? output resistance single ended ? ? 50 ? ? note s : 1. tested on cb1524 board from 5mhz to 2ghz. 2. all parts production tested. in order to guarantee jitter over the full range of specification (v cc = 3.3v 5%, t a = 0c to 70c, and 720-880mv launch swing from the sd i cable driver) the reco mmended applications circuit must be used. 3. based on characterization data using the recommended a pplications circuit, at v cc = 3.3v, t a = 25c, and 800mv launch swing from the sdi cable driver. 4. equalizer pathological test signal is used. gi g abert 1400 ext. clock clock out data out ext. clock 1.485ghz/270mhz gs1524 test board tds 820 ch. 1 ch. 2 out in out ext. trigger 50/75 8281 or 1 6 94a cable
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 7 of 16 3. input/output circuits all resistors in ohms, all capacitors in farads, unless otherwise shown. figure 3-1: input equivalent c ircuit figure 3-2: c li output c ircuit figure 3-3: m c lad j equivalent c ircuit figure 3-4: c d /mute c ircuit figure 3-5: output c ircuit figure 3-6: bypass c ircuit 3k 3. 6 k 3k 3. 6 k rc sdi sdi 10k 10k v cc cli - + v cc mcladj 12k 150 + - 7.5k output stage mute control v cc cd/mute 50 50 sdo sdo bypass internal referen c e
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 8 of 16 4. typical performance curves (unless otherwise shown, v cc = 3.3v, t a = 25c) figure 4-1: power c onsumption figure 4-2: typical peak to peak j itter, prn 2 23 -1, belden 1694a, 1.485 g b/s 350 300 250 200 150 100 50 0 0 20 40 6 0 80 temperature (c) power consumption (mw) 1 6 0 140 120 100 80 6 0 40 20 0 0 50 100 150 200 cable length (m) jitter (ps) 1100 900 700 500 400 300 200 100 0 0 100 200 300 400 cable length (m) jitter (ps)
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 9 of 16 figure 4-3: typical peak to peak j itter, prn 2 23 -1, belden 1694a, 270mb/s figure 4-4: output s ignal s wing, p-p, s ingle ended figure 4-5: m c lad j input voltage vs. 1694a c able length, 270mb/s figure 4-6: c li voltage vs. belden 8281 c able length, 270mb/s 500 400 300 200 100 0 0 20 40 6 0 80 temperature (c) output signal swing (mv) cable length (m) voltage (v) 2.0 0 50 100 150 200 250 300 2.5 3.0 3.5 cable length (m) cli voltage (v) 3.5 3 2.5 2 1.5 0 50 100 150 200 250 300
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 10 of 16 figure 4-7: input 100m (belden 8281), 1.485 g b/s figure 4-8: output 100m (belden 8281), 1.485 g b/s tek running: normal
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 11 of 16 figure 4-9: input 280m (belden 8281), 270mb/s figure 4-10: output 280m (belden 8281), 270mb/s figure 4-11: input return loss using c b1524 board 0.05 ghz 1 ghz 2 ghz 0 -10 -20 -30 -40 -50
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 12 of 16 5. detailed description the gs1524 is a high speed bipola r ic designed to equalize bo th hd and sd serial digital signals. the device can ty pically equalize greater th an 140 meters of belden 1694a cable at 1.485gb/ s and 350m at 270mb/s. powered from a single +3.3v or -3.3v power supply, the device consumes appr oximately 265mw of power. 5.1 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. 5.2 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. the digital output signals have a nominal voltage of 750mv pp differential, or 375mv pp single ended when terminated with 50 as shown in figure 5-1 . figure 5-1: typical output voltage levels 50 50 sdo sdo +187.5mv -187.5mv v cm = 2.925v typi c al +187.5mv -187.5mv v cm = 2.925v typi c al
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 13 of 16 5.3 programmable mute output & cable length indicator for smpte 259m inputs, the gs 1524 incorporates an analog cable length in dicator (cli) output and a programmable threshold output mute (mcladj). the voltage output of cli pin is an approxim ation of the amount of cable present at the gs1524 input for data rates up to 360mb/s. the cli voltage versus cable length (signal strength) is shown in figure 4-6 . with 0m of cable, 800mv in put signal levels and at 270mb/s, the cli output voltage is approximately 2.5v. as th e cable length increases, the cli voltage decreases providing an approximate correlation between the cli voltage and cable length. in applications where ther e are multiple input channe ls using the gs1524, it is advantageous to have a programmable mute output to avoid signal crosstalk. the output of the gs1524 can be muted wh en the input signal decreases below a selectable input level. the voltage applied to the mcladj pin vs. input cable length is shown in figure 4-5 . for consistent accurate results this may need to be calibrated for each device. the mcladj pin may be left unconnected for applications where output muting is not required. this feature has been designed for use in applications 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: mcladj and cli are only recomm ended for data ra tes up to 360mb/s. 5.4 mute and carrier detect in addition, a multi-function cd /mute pin allows control of the gs1524 mute functionality for both sd and hd inputs. the cd /mute pin is a multi-function bidirectional pin that provides the following functions: applying a high input to the cd /mute pin forces the gs1524 outputs to a muted condition. see the table 2-1: dc electr ical characteristics for voltage levels. in this condition the outputs will be latched to the last logic level present at the output to avoid signal crosstalk. applying a low input to the cd /mute pin will force the gs1524 outputs to remain active regardless of the length of input cabl e and the voltage applied to the mcladj pin. see the table 2-1: dc electr ical characteristics for voltage levels. when used as an output, the cd /mute pin will provide an indication of the output mute status. the cd /mute voltage will fall to below 1.2v when the carrier is present and the data outputs are active. note: the cd /mute pin is not functional in bypass mode.
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 14 of 16 6. application information 6.1 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 hd rate signals is closely matched to smt component width to minimize reflections due to change in trace impedance. the pcb ground plane is re moved under the gs1524 input components to minimize parasitic capacitance. the pcb ground plane is re moved under the gs1524 output components to minimize parasitic capacitance. high-speed traces are curved to minimize impedance changes. 6.2 typical application circuit figure 6-1: gs 1524 typical application c ircuit 6 .4n 10n bypass mcladj 75 sdo bnc vcc cli 1u 10n 75 4u7 4u7 gs1524 4 5 1 6 6 2 12 13 3 11 14 15 8 + + + 9 10 1 7 sdi sdi cd/mute vee vcc sdo sdo vee vee vee vcc agc- bypass mcladj cli agc+ 1u sdo cd/mute 37.4 1u vcc 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 .
gs1524 multi-rate sdi adaptive cable equalizer data sheet 14976 - 11 august 2011 15 of 16 7. package & order information 7.1 package dimensions figure 7-1: 16-pin s oi c 7.2 ordering information symbol a a1 a2 b c d e e h l1 l y min. min. max. max. nom. nom. millimeter inch * controlling dimension: mm 1.35 0.10 1.30 0.33 0.19 9.80 3.80 5.80 0.40 0 1.63 0.15 1.40 0.41 9.91 3.90 1.27 6.00 0.64 1.07 1.75 0.25 1.50 0.51 0.25 10.01 4.00 0.053 0.004 0.051 0.013 0.064 0.006 0.055 0.016 0.390 0.154 0.50 0.069 0.010 0.059 0.020 0.010 0.394 0.157 0 8 8 6.20 1.27 0.10 0.004 0.042 0.025 0.016 0.228 0.236 0.244 0.050 0.150 0.386 0.007 part number package te m p e r a t u r e pb-free and rohs compliant gs 1524- c kde3 16 pin s oi c 0 c to 70 c yes gs 1524- c tde3 16 pin s oi c tape (250pcs) 0 c to 70 c yes gs 1524- c tde3z 16 pin s oi c tape (2,500pcs) 0 c to 70 c yes
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