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gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver 1 of 13 gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 www.gennum.com features ? smpte 292m, smpte 344m and smpte 259m compliant ? dual coaxial cable driving outputs with selectable slew rate ?50 differential pecl input ? seamless interface to other hd-linx ? ii family products ? pb-free and rohs compliant ? 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 gs1528 is a second generation high-speed bipolar integrated circuit designed to drive one or two 75 co-axial cables at data rates up to 1.485gb/s. the gs1528 provides two selectable slew rates in order to achieve compliance to smpte 259m, smpte 344m and smpte 292m. the gs1528 accepts a lvpecl level differential input that may be ac-coupled. external biasing resistors at the inputs are not required. p ower consumption is typically 160mw using a 3.3v power supply. this component and all homogeneous subcomponents are rohs compliant. functional block diagram sdo r set sdo sdi sdi sd/hd bandgap reference and biasing circuit output stage & control input differential pair
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 2 of 13 revision history contents 1.1 absolute maximum ratings .................................................................................................. ........3 1.2 dc electrical characteristics ............................................................................................. ...........3 1.3 ac electrical characteristics ............................................................................................. ...........4 2.1 pin assignment ............................................................................................................ ......................5 2.2 pin descriptions .......................................................................................................... ......................5 2.3 input/output circuits ..................................................................................................... ................6 3.1 input interfacing ......................................................................................................... ......................7 3.2 sd/hd ..................................................................................................................... .............................7 3.3 output interfacing ........................................................................................................ ...................7 3.4 output return loss measurement ............................................................................................ ..9 3.5 output amplitude adjustment ............................................................................................... .. 10 4.1 pcb layout ................................................................................................................ ....................... 11 4.2 typical application circuit ............................................................................................... ......... 11 5.1 ordering information ...................................................................................................... ............. 12 version ecr pcn date changes and / or modifications 9 154748 ? au g ust 2010 c orre c te d fi g ure 5-1: pa c ka g e dimensions . 8 152046 ? june 2009 remove d ?proprietary & c onfi d ential? from footer. 7 151340 ? february 2009 up d ate d d o c ument format. a dd e d 2,500p c reel, an d remove d lea d e d parts in se c tion 5.1 or d erin g information . 6 139116 38124 january 2006 c orre c te d s erial input s win g to 2200mv 5 137163 ? june 2005 rephrase d roh s c omplian c e statement. 4 136566 ? april 2005 up d ate d ?green? referen c es to roh s c ompliant.
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 3 of 13 1. electrical characteristics 1.1 absolute maximum ratings t a = 25c unless otherwise indicated 1.2 dc electrical characteristics parameter value s upply volta g e -0.5v to 3.6 v d c input e s d volta g e 500v s tora g e temperature ran g e -50 c < t s < 125 c input volta g e ran g e (any input) -0.3 to (v cc +0.3)v operatin g temperature ran g e0 c to 70 c power dissipation 300mw lea d temperature (sol d erin g , 10 se c ) 260 c caution the gs1528 is sensitive to electrostatic discharge. use extreme caution, observing all esd-prevention practices, during handling and assembly. the sdi inputs of the gs1528 must be protected from electrostatic discharge and electrical overstress during the handling and operation of circuit assemblies table 1-1: dc electrical characteristics v dd = 3.3v, t a = 0 c to 70 c , unless otherwise shown parameter conditions symbol min ty p max units notes te s t levels s upply volta g ev cc 3.135 3.3 3.465 v 5% 3 power c onsumption t a = 25 c p d ? 160 ? mw 5 s upply c urrent t a = 25 c s ?48?ma 1 output volta g e c ommon mo d e v c mout ?v cc - v out ?? 6 input volta g e c ommon mo d e v c min 1.6 + v s di /2 ? v cc - v s di /2 v 5 s d/hd input v ih 2.4 ? ? v 7 v il ??0.8v 7
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 4 of 13 1.3 ac electrical characteristics table 1-2: ac electrical characteristics v dd = 3.3v, t a = 0 c to 70 c , unless otherwise shown parameter conditions symbol min ty p max units notes test levels s erial input d ata rate dr s do ? ? 1.485 gb/s 2 1 a dd itive jitter 1.485gb/s ? 15 ? ps p-p 1 270mb/s ? 25 ? ps p-p 1 rise/fall time s d/hd =0 t r , t f ? ? 220 ps 20% to 80% 1 s d/hd =1 t r , t f 400 ? 800 ps 20% to 80% 1 mismat c h in rise/fall time u t r , u t f ??30 ps 1 duty c y c le d istortion ? ? 30 ps 1 overshoot ? ? 8 % 1 output return loss orl 15 ? ? d b1 7 output volta g e s win gs in g le en d e d into 75 external loa d r s et = 750 v out 750 800 850 mv p-p 1 input volta g e s win g differential u v s di 300 ? 2200 mv p-p 1 te s t level s 1. production test at room temperature and nominal supply voltage with guardba nds for supply and temperature ranges. 2. production test at room temperature and nominal supply voltage with guardbands for supply and temperature ranges using correl ated test. 3. production test at room temper ature and nominal supply voltage. 4. qa sample test. 5. calculated result based on level 1, 2, or 3. 6. not tested. guaranteed by design simulations. 7. not tested. based on characterization of nominal parts. 8. not tested. based on existing design/ch aracterization data of similar product. 9. indirect test. note s : 1. tested on cb1528 board from 5mhz to 1.435ghz 2. the input coupling capacitor must be set accordingly for lower data rates.
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 5 of 13 2. pin out 2.1 pin assignment fi g ure 2-1: 8-pin s oi c 2.2 pin descriptions sdi sdi v ee r set sdo sdo sd/hd v cc 1 2 3 4 8 7 6 5 g s1528 8-pin soic (top view) table 2-1: pin descriptions pin number name ty p e description 1,2 s di, s di pe c l input s erial d i g ital d ifferential input. 3v ee power most ne g ative power supply c onne c tion. c onne c t to gnd. 4r s et input external output amplitu d e c ontrol resistor. 5v cc power most positive power supply c onne c tion. c onne c t to +3.3v. 6 s d/hd logi c input output slew rate c ontrol. when high, the output will meet s mpte259m rise/fall time spe c ifi c ations. when low, the serial outputs will meet s mpte292m rise/fall time spe c ifi c ations. 7, 8 s do , s do output s erial d i g ital d ifferential output.
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 6 of 13 2.3 input/output circuits fi g ure 2-2: differential input s ta g e ( s di/ s di ) fi g ure 2-3: differential output s ta g e ( s do/ s do ) ref d erive d usin g r s et fi g ure 2-4: s lew rate s ele c t input s ta g e ( s d/ hd ) v cc v cc sdi sdi 10k 10k 5k 10k v cc ref sdo sdo sd/hd v cc on chip reference
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 7 of 13 3. detailed description 3.1 input interfacing s di/sdi are high-impedance differential inpu ts (see figure 2-1 for equivalent input circuit). several conditions must be observed when interfacing to these inputs: 1. the differential input signal amplitude must be between 300 and 2000mvpp. 2. the common mode voltage range must be as specified in table 1-1: dc electrical characteristics . 3. for input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the typical application circuit . the gs1528 inputs are self-biased, allowing for simple ac-coupling to the device. for serial digital video, a minimum capacitor value of 4.7 f should be used to allow coupling of pathological test signals. a tantalum capacitor is recommended. 3.2 sd/ hd the gs1528 sdo rise and fall times can be set to comply with both smpte 259m/344m and smpte 292m. for all smpte 259m standards, or any data rate that requires longer rise and fall time characteristics, the sd/hd pin must be set to a high input. for smpte 292m standards and signals which require faster rise and fall times, this pin should be set to a low input. 3.3 output interfacing the gs1528 outputs are current mode, and will drive 800mv into a 75 load. these outputs are protected from accidental static damage with internal static protection diodes. the smpte 292m, smpte 344m and smpte 259m standards requires that the output of a cable driver have a source impedance of 75 and a return loss of at least 15db between 5mhz and 1.485ghz. in order for an sdi output circuit using the gs1528 to meet this specification, the output circuit shown in the typical application circuit is recommended. the value of l comp will vary depending on the pcb layout, with a typical value of 5.6nh (see the application information on page 11 in this data sheet for further details). a 4.7 f capacitor is used for ac-coupling the outp ut of the gs1528. this value is chosen to ensure that pathological signals can be coupled without a significant dc component occurring.
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 8 of 13 fi g ure 3-1: output si g nal for 270mb/s input fi g ure 3-2: output si g nal for 1.485gb/s input when measuring return loss at the gs1528 output, it is necessary to take the measurement for both a logic high and a logic low output condition. this is because the output protection diodes act as varactors (voltage controlled capacitors) as shown in figure 3-3 . consequently, the output capacitance of the gs1528 is dependent on the logic state of the output. tek stopped: 8110 acquisitions tek running: normal
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 9 of 13 fi g ure 3-3: s tati c prote c tion dio d es 3.4 output return loss measurement to perform a practical return loss measurement, it is necessary to force the gs1528 output to a dc high or low condition. the actual measured return loss will be based on the outputs being static at v cc or v cc -1.6v. under normal operating conditions the outputs of the gs1528 swing between v cc -0.4v and v cc -1.2v, so the measured value of return loss will not represent the actual operating return loss. a simple method of calculating the values of actual operating return loss is to interpolate the two return loss measurements. in this way, the values of return loss are estimated at v cc -0.4v and v cc -1.2v based on the measurements at v cc and v cc -1.6v. the two values of return loss (high and low) will typically differ by several decibels. if the measured return loss is r h for logic high and r l for logic low, then the two values can be interpolated as follows: r ih = r h - (r h -r l )/4 and r il = r l + (r h -r l )/4 where r ih is the interpolated logic high value and r il is the interpolated logic low value. for example: if r h = -18db and r l = -14db, then the interpolated values are r ih = -17db and r il = -15db. sdo sdo g s1528
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 10 of 13 3.5 output amplitude adjustment the output amplitude of the gs1528 can be adjusted by changing the value of the r set resistor as shown in figure 3-4 and table 3-1 . for an 800mv p-p output with a nominal 7% tolerance, a value of 750 is required. a 1% smt resistor should be used. fi g ure 3-4: output amplitu d e a d justment the r set resistor is part of the high-speed output circuit of the gs1528. the resistor should be placed as close as possible to the r set pin. in addition, the pcb capacitance should be minimized at this node by removing the pcb ground plane beneath the r set resistor and the r set pin. note: for reliable operation of the gs1528 over the full temperature range, do not use an r set value below 573 . table 3-1: r set vs. v od r set resistance ( ) output swing 995 608 824 734 750 800 600 884 573 1040 1100 1000 900 800 700 700 800 900 1000 r set r (w) output swing (mv) 6 00 6 00 500
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 11 of 13 4. application information 4.1 pcb layout special attention must be paid to component layout when designing serial digital interfaces for hdtv. an fr-4 dielectric can be used, however, controlled impedance transmission lines are required for pcb traces longer than approximately 1cm. note the following pcb artwork features used to optimize performance: ? the pcb trace width for hd rate signals is closely matched to smt component width to minimize reflections due to changes in trace impedance ? the pcb groundplane is removed under the gs1528 output components to minimize parasitic capacitance ? the pcb ground plane is removed under the gs1528 r set pin and resistor to minimize parasitic capacitance ? input and output bnc connectors are surface-mounted in-line to eliminate transmission line stubs caused by a bnc mounting via high-speed traces, which are curved to minimize impedance variations due to change of pcb trace width 4.2 typical application circuit fi g ure 4-1: g s 1528 typi c al appli c ation c ir c uit sd/hd g s1528 1 2 3 4 8 7 6 5 sdi sdi vee rset sdo sdo sd/hd vcc 10n 75 5. 6 n 4u7 bnc vcc 75 5. 6 n 10n 75 4u7 49.9 750 10n 49.9 4u7 75 bnc vcc 4u7 vcc * typical value varies with layout differential data input * * note: all resistors in ohms, capacitors in farads, and inductors in henrys, unless otherwise noted.
gs1528 hd-linx ii multi-rate sdi dual slew-rate cable driver data sheet 16632 - 9 august 2010 12 of 13 5. package dimensions fi g ure 5-1: pa c ka g e dimensions 5.1 ordering information 0.010 q2 l detail ?a? c 0.015 0.004 x 45 detail ?a? q1 b a a1 e x d e pin 1 id mark g auge plane seating plane notes: 1. all dimensions in inches unless otherwise stated. 2. lead coplanarity should b e 0 to 0.004? max. 3. package surface finishing: vdi 24~27 (dual). package surface finishing: vdi 13~15 (1 6 l soic[nb] matrix). 4. all dimensions exclude mold flashes. 5. the lead width (b) to b e determined at 0.0075? from the lead tip. 8 soic min. max. symbol a a1 b d e h e c l x q2 q1 0.054 0.0 6 8 0.004 0.0098 0.014 0.019 0.189 0.19 6 0.157 0.244 0.229 0.150 0.050 bsc 0.0075 0.0098 0.01 6 0.034 0.0215 ref 0 8 7 bsc part number package temperature pb-free and rohs compliant g s 1528- c kae3 8 pin s oi c 0 c to 70 c yes g s 1528- c tae3 8 pin s oi c , tape & reel (250p c ) 0 c to 70 c yes g s 1528- c tae3z 8 pin s oi c , tape & reel (2,500p c ) 0 c to 70 c yes
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