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gennum corporation p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 e-mail: info@gennum.com www.gennum.com revision date: june 2004 document no. 522 - 05 - 05 data sheet gs1504 hd-linx ? gs1504 hdtv adaptive equalizer features ? smpte 292m compliant automatic, adjustment fr ee cable equalization for 1.485gb/s hd tv signals differential serial outp uts capable of driving 50 ? loads typically equalizes 100m of belden 8281 or 150m of belden 1694 high qual ity co-axial cable cable length indication output mute maximum cable length adjust low power minimal external components single +5v or -5v power supply operation pb-free and green applications 1.485gb/s hdtv serial digital receiver interfaces for routers, distribution amplif iers, switchers, and other receiving equipment. description the gs1504 is a high performance cable equalizer designed to equalize hdtv component signal conforming to smpte 292m. the adaptive cable equalizer is capable of equalizing up to 100m of belden 8281 co-axial cable. the gs1504 features dc restor ation for immunity to the dc content in pathological test patterns. the device also incorporates a cable length in dicator signal that provides an indication of the amount of cable being equalized. a voltage programmable mute threshold (mcladj) is included to allow muting of the gs1504 output when a selected cable length is reached. this feature allows the gs1504 to distinguish between low amplitude hd sdi signals and noise at the input of the device. the cd /mute pin provides an indication of the gs1504 mute status in addition to functioning as a mute control input. the output of the gs1504 may be forced to an active or a mute condition by applying a voltage to the cd /mute pin. the gs1504 is a low power device that operates from a single 5v power supply. t he gs1504 is packaged in a 16 pin narrow soic and does not need external pull-up resistors. block diagram ordering information part number package temperature pb-free and green gs1504-ckd 16 pin narrow soic 0c to 70c no gs1504-ctd 16 pin tape and reel 0c to 70c no GS1504-CKDE3 16 pin narrow soic 0c to 70c yes gs1504-ctde3 16 pin tape and reel 0c to 70c yes cable length indicator/adjustor carrier detect mute mcladj cli cd/mute equalizer dc restore output agc sdi sdi sdo sdo patent pending
522 - 05 - 05 2 of 13 gs1504 fig. 1 test setup absolute maximum ratings t a = 25c unless otherwise indicated parameter value supply voltage 5.5v input voltage range (any input) -0.3 to (v cc +0.3)v operating temperature range 0c to 70c storage temperature -65c to 150c power dissipation 300mw lead temperature (soldering, 10 sec) 260c input esd voltage 2000v dc electrical characteristics v cc = 5v, v ee = 0v, t a = 0c to 70c, data rate = 1.485gb/s parameter conditions symbol min typ max units test levels positive supply voltage v cc 4.75 5.00 5.25 v 1 power consumption - 250 - mw 1 supply current -5065.0ma 1 output cm voltage 3.75 4 4.25 v 1 input dc voltage internal bias. see figure 2 - 2.7 - v 1 cli dc voltage (0m) cli output for 0m cable - 3.3 - v 4 cli dc voltage (no signal input) 0.9 1.3 1.7 v 1 cable length indicator range 0 - max m cli - 2 - v 2 mcladj dc voltage mcladj input voltage required to mute output 2.80 3.1 3.4 v 1 mcladj range (max cable to 0m) 1 v 2 mute dc voltage output voltage of cd /mute when output is active 1.5 1.8 2.1 v 1 voltage required to force outputs to mute min to mute; v cd /mute 4.2 v 2 voltage required to force outputs active max to activate; v cd /mute 3.8 v 2 test levels: 1. 100% tested at 25c. 2. guaranteed by design. 3. correlated value. 4. using eb1504 gigabert 1400 ext. clock clock out data out ext. clock 1.485ghz gs1504 eval. board tds 820 ch. 1 ch. 2 out in out ext. trigger mcladj cli dvm 50/75 10k 2k 15k 8281 or 1694a cable
522 - 05 - 05 3 of 13 gs1504 pin connections ac electrical characteristics v cc = 5v, v ee = 0v, t a = 0c to 70c, data rate = 1.485gb/s parameter conditions symbol min typ max units test level jitter 100m (8281), prn and pathological - 80 135 ps p-p 1 equalization belden 8281 - 100 - m 1 belden 1694 - 150 - m 3 output rise/fall time 20% - 80% - 130 270 ps 1 input resistance single ended - 2.8 . k ? 2 input capacitance single ended - 1 - pf 2 output resistance single ended - 50 - ? 2 output signal swing sdo, sdo into 50 ? loads; see figure 21. 160 200 240 mvp-p 1 test levels: 1. 100% tested at 25c. 2. guaranteed by design. 3. correlated value. 4. using eb1504 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 cli v cc v ee sdi sdi v ee mcladj nc cd/mute v cc v ee sdo sdo v ee nc nc gs1504 top view pin descriptions number symbol type description 1clio cable length indication . provides a voltage output representing the amount of cable being equalized. see figures 19 and 20. the cli voltag e is an approximation of the cable length being equalized. it is intended as a guide for troubleshooting the initial design and not as an accurate indication of cable length. 2, 15 v cc i most positive supply voltage. 3, 6, 11, 14 v ee i most negative supply voltage. 4, 5 sdi, sdi i differential input pins . ac coupled termination is recommended. 7 mcladj i adjusts the 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 reached. to achieve maximum cable length, this pin should be left open. see figures 10 - 12. 8, 9, 10 nc - no connect . do not connect these pins to supply or ground. 12, 13 sdo, sdo o differential serial data output pins , with 50 ? output resistance. 16 cd /mute i/o carrier detect/mute indicator/control . when the cd /mute output is low, the carrier is present and the data output is active. when the cd /mute output is high, the carrier is not present and the data output is muted (latched to the last state). this indicates that the maximum cable length as set by mcladj has been reached. the above default cd /mute function can be overwritten as follows: if the cd /mute pin is tied to ground the data output will not mute and the mcladj setting is overwritten. if the mute pin is tied high, the data output will always mute and the mcladj setting is overwritten.
522 - 05 - 05 4 of 13 gs1504 input/output circuits all resistors in ohms, all capacitors in farads, unless otherwise shown. fig. 2 input equivalent circuit fig. 3 mcladj equivalent circuit fig. 4 output circuit fig. 5 cli output circuit fig. 6 cd /mute circuit 6k 7k 6k 7k rc sdi sdi v cc mcladj 40k 42 + - 50 50 sdo sdo 10k 10k v cc cli - + 10k 20k output stage mute control v cc cd/mute
522 - 05 - 05 5 of 13 gs1504 typical performance curves (unless otherwise shown, v cc = 5v, t a = 25c) fig. 7 power consumption fig. 8 typical peak to peak jitter, prn 2 23 -1, belden 1694a fig. 9 typical peak to peak jitter, prn 2 23 -1, belden 8281 fig. 10 temperature compensation of mcladj fig. 11 typical 1694a cable length vs. temperature fig. 12 mcladj input voltage vs 1694a cable length 350 300 250 200 150 100 50 0 0 20 40 60 80 temperature (?c) power consumption (mw) 800 700 600 500 400 300 200 100 0 0 50 100 150 200 cable length (m) jitter (ps) 800 700 600 500 400 300 200 100 0 0 50 100 150 200 cable length (m) jitter (ps) mcladj mcladj uncompensated mcladj temperature compensated mcladj 102 100 98 96 94 92 90 88 86 84 0 20 40 60 80 temperature (?c) uncompensated cable length (m) compensated 90 80 70 60 50 40 30 20 10 0 cable length (m) voltage normalized to v cc (%) 0 50 100 150 200
522 - 05 - 05 6 of 13 gs1504 typical performance curves (unless otherwise shown v cc = 5v, t a = 25c) fig. 13 input 100m (belden 1694a) fig. 14 output 100m (belden 1694a) fig. 15 input 150m (belden 1694a) fig. 16 output 150m (belden 1694a) fig. 17 input return loss fig. 18 output signal swing, p-p, differential 50 40 30 20 10 0 -10 -20 -30 -40 -50 0.05 ghz 1 ghz 2 ghz 500 400 300 200 100 0 0 20 40 60 80 temperature (?c) output signal swing (mv)
522 - 05 - 05 7 of 13 gs1504 fig. 19 cli voltage vs. belden 1694a cable length fig. 20 cli voltage vs. belden 8281 cable length detailed description the gs1504 is a high speed bipolar ic designed to equalize hd serial digital data at a rate of 1.485gb/s. the device can typically equalize greater than 100 meters of belden 8281 cable or 150 me ters of belden 1694 cable. powered from a single +5v or -5v power supply, the device consumes approximately 250mw of power the hd 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 2.7 volts. the input signal passes through a variable gain equalizing stage whose frequency response closely matches the inverse 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 equaliz ed 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 an internal agc filter capacitor providing a steady control voltage for the gain stage. as the frequency response of the gain stage is automatically varied by the application of negat ive 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 al so dc restored, effectively restoring the logic threshold of the equalized signal to its correct level independent of sh ifts due to ac coupling. the digital output signals have a nominal voltage of 400mvpp differential, or 200mvpp single ended when terminated with 50 ? as shown in figure 21. fig. 21 typical output voltage levels cable length indication/carrier detect/mute the gs1504 incorporates a versatile analog cable length indicator (cli) output and a programmable threshold output mute (mcladj). in addition, a multi-function cd /mute pin allows control of the gs1504 mute functionality. the voltage output of cli pin is an approximation of the amount of cable present at the gs1504 input. the cli voltage versus cable length (signal strength) is shown in figures 19 and 20. with 0m of cable (800mv input signal levels), the cli output voltage is approximately 3.3v. as the cable length increases, the cli voltage decreases providing an approximate cor relation between the cli voltage and cable length. in applications where there are multiple input channels using the gs1504, it is advantageous to have a programmable mute output. the output of the gs1504 c an be muted when the input signal decreases below a preselected input level. the voltage applied to the mcladj pin vs input cable length is shown in figure 12. 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 router s where signal crosstalk and circuit noise cause the equaliz er 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 3.5 3 2.5 2 1.5 1 0.5 0 0 50 100 150 200 cable length (m) cli voltage (v) 3.5 3 2.5 2 1.5 1 0.5 0 0 50 100 150 cable length (m) cli voltage (v) 50 50 sdo sdo +100mv -100mv v cm = 4.0v typical +100mv -100mv v cm = 4.0v typical
522 - 05 - 05 8 of 13 gs1504 could be significantly less than the default signal detection level set by the on chip reference. 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 gs1504 outputs to a mute d condition. see the dc electrical characteristics table for voltage level. in this condition the outputs will be latched to the last logic level present at the output. applying a low input to the cd /mute pin will force the gs1504 outputs to remain active regardless of the length of input cable and the voltage applied to the mcladj pin. see the dc electrical characteristics table for voltage level. when used as an output, the cd /mute pin will provide an indication of the output mute status. the cd /mute pin will be logic high when the output is muted, and logic low when the outputs are not muted. typical application circuit cli v cc v ee sdi sdi v ee mcladj nc cd/mute v cc v ee sdo sdo v ee nc nc v cc v cc 10n 47 47 v cc 10n v cc 1 100n 1n 10n 2k 10k 15k 10n 47p 47p 75 75 10nh 37.5 + + gs1504 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 all resistors in ohms, all capacitors in farads, unless otherwise shown. v cc j3 2 1
522 - 05 - 05 9 of 13 gs1504 application information pcb layout special attention must be pa id to component layout when designing serial digital interfaces for hdtv. figures 23 through 27 show the artwork for a four layer printed circuit evaluation board for the gs1504. the schematic is shown in figure 22. 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 hd rate signals is closely matched to smt component width to minimize reflections due to change in trace impedance. the pcb ground plane is removed under the gs1504 input components to minimize parasitic capacitance. the pcb ground plane is removed under the gs1504 output components to minimize parasitic capacitance. high speed traces are curved to minimize impedance changes. a picture of the gs1504 pcb assembly is shown in figure 28. gs1504 evaluation board fig. 22 gs1504 application schematic cli v cc v ee sdi sdi v ee mcladj nc cd/mute v cc v ee sdo sdo v ee nc nc v cc v cc 10n 4.7 4.7 v cc 10n v cc 10n 2k 10k 15k 10n 47p 47p 75 75 10nh 37 r1 l4 r4 j1 r2 c8 c7 c2 c1 c6 c5 j4 r5 r3 r6 tp1 j5 c3 c4 j2 j3 1 c10 100n c9 1n c11 c1, c2 must be tantalum capacitors. + + 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 all resistors in ohms, all capacitors in farads, unless otherwise shown.
522 - 05 - 05 10 of 13 gs1504 fig. 23 silk screen of eb1504 pcb layout fig. 24 top layer of eb1504 pcb layout fig. 25 ground layer of eb1504 pcb layout fig. 26 bottom layer of eb1504 pcb layout fig. 27 power layer of eb1504 pcb layout fig. 28 photograph of gs1504 evaluation board
522 - 05 - 05 11 of 13 gs1504 gs1504 / gs1508 interfacing figures 30 through 34 show the artwork for a four layer printed circuit evaluation board for the gs1504. the schematic is shown in fig 29. 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 artwor k 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 removed under the gs1504/gs1508 input components to minimize parasitic capacitance. the pcb ground plane is removed under the gs1504/gs1508 output components to minimize parasitic capacitance. high speed traces are curved to minimize impedance changes. a picture of the gs1504/08 pcb assembly is shown in figure 34. fig. 29 gs1504/08 evaluation board assembly sdo sdo c11 47 c12 47 c11 and c12 are tc3216 tantalum capacitors. l2 12n 75 1p 1p 75 12n r9 c17 c18 r10 l3 j4 edgemnt_bnc j5 edgemnt_bnc v cc v cc c10 100n r7 75 r8 75 c15 10n sdo sdo gnd v cc sdi sdi v ee r set 1 2 3 4 8 7 6 5 u2 gs1508 r11 53.6 r8 49.9 r7 49.9 c16 1n j1 close to mute v cc c20 10n v cc c4 10n cd/mute v cc v ee sdo sdo v ee nc nc cli v cc v ee sdi sdi v ee mcladj nc 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 c5 10n tp3 cli v cc c6 10n r16 75 c7 47p c8 47p r15 37.5 l4 10n r1 75 j2 video in r6 15k r5 10k r4 2k 1 2 j3 v cc v cc c1 1 c2 100n c3 1n tp1 v cc tp2 gnd all resistors in ohms, all capacitors in farads, unless otherwise shown.
522 - 05 - 05 12 of 13 gs1504 fig. 30 top layer of eb1504/08 pcb layout fig. 31 power layer of eb1504/08 pcb layout fig. 32 ground layer of eb1504/08 pcb layout fig. 33 bottom layer of eb1504/08 pcb layout = fig. 34 photograph of gs1504/gs1508 evaluation board
522 - 05 - 05 13 of 13 gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 gennum japan corporation shinjuku green tower building 27f 6-14-1, nishi shinjuku shinjuku-ku, tokyo 160-0023 japan tel: +81 (03) 3349-5501 fax: +81 (03) 3349-5505 gennum uk limited centaur house, ancells bus. park, ancel ls rd, fleet, hants, england gu13 8uj tel. +44 (0)1252 761 039 fax +44 (0)1252 761 114 gennum corporation assumes no responsibility for the use of any circuits described herein and makes no representations that th ey are free from patent infringement. ? copyright august 1998 gennum corporation. all rights reserved . printed in canada. gs1504 package dimensions controlling dimension: mm symbol millimeter inch min nom max. min. nom. max a 1:35 1:63 1.75 0.053 0.064 0.069 a1 0.10 0.15 0.25 0.004 0.006 0.010 a2 1.30 1.40 1.50 0.051 0.055 0.059 b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.25 0.007 0.010 d 9.80 9.91 10.01 0.386 0.390 0.394 e 3.80 3.90 4.00 0.150 0.154 0.157 e 1.27 0.050 h 5.80 6.00 6.20 0.228 0.236 0.244 l 0.40 0.64 1.27 0.016 0.025 0.050 l1 1.07 0.042 y 0.10 0.004 00 80 8 16 1 b d seating plane e e h 8 9 0 l detail f see detail f l1 c gauge plane 0.010" a a2 a1 y revision notes: added pb-free and green information. for the latest product information, visit www.gennum.com caution electrostatic sensitive devices do not open packages or handle except at a static-free workstation document identification data sheet the product is in production. gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible.

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