View GS150810_7584093.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 of 14 gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 gs1508 hd-linx? hdtv cable driver www.gennum.com features ? smpte 292m compliant ? dual cable driving outputs optimized for driving data up to 1.485gb/s ? 7% tolerance output ? >17db output return loss ? minimum external components ? seamless interface with the hd-linx? family of products ?low-power ? standard packaging ? pb-free and green applicatons ? 1.485gb/s hdtv serial digital receiver interfaces for: routers, distribution amplifiers, switchers, and other transmitting equipment description the gs1508 is a first generation very high-speed bipolar integrated circuit designed to drive two 75 co-axial cables. the gs1508 is a smpte 292m compliant cable driver that directly interfaces with other gennum hdtv devices and can also be used as a general purpose high-speed cable driver. the gs1508 features two complementary outputs, with amplitudes controlled within a precise 7% variation. the output amplitude can be varied by adjusting the r set resistor value. the serial inputs can be ac-coupled. the gs1508 is a low-power device that does not require external pull-down resistors. the gs1508 is packaged in an 8-pin soic, and operates from a single 5v power supply. figure a: block diagram sdo r set sdo sdi sdi bandgap reference and biasing circuit output stage and control input differential pair patent pending
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 2 of 14 1. pin out 1.1 pin assignment fi g ure 1-1: pin assi g nment 1.2 pin descriptions sdi sdi v ee r set sdo sdo gnd v cc 1 2 3 4 8 7 6 5 gs1508 (top view) table 1-1: pin descriptions pin number symbol ty p e description 1, 2 s di, s di input s erial d ata inputs (non-invertin g an d invertin g ). 3 vee power most ne g ative supply volta g e. 4r s et input output amplitu d e c ontrol resistor. 5v cc power most positive supply volta g e. 6g nd power not c onne c te d internally. c onne c t to g roun d . use d for isolation. 7, 8 s do , s do output s erial d ata outputs (non-invertin g an d invertin g ).
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 3 of 14 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics table 2-1: absolute maximum ratings t a = 25 c unless otherwise in d i c ate d parameter value s upply volta g e5.5v 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 s tora g e temperature - 6 5 c to +150 c power dissipation 300mw lea d temperature (sol d erin g , 10 se c )2 6 0 c input e s d volta g e 2000v table 2-2: dc electrical characteristics v cc = 5v, t a = 0 c to 70 c unless otherwise shown. s pe c ifi c ations assume 800mv output amplitu d e level settin g s into en d terminate d 75 transmission lines. data rate = 1485mb/s unless otherwise shown. parameter condition symbol min ty p max units notes te s t level s upply volta g e? v cc 4.75 5.00 5.25 v ? 1 s ystem power c onsumption drivin g two 75 c ables p d ? 215 2 6 5mw?1 s upply c urrent ? i s ?4354ma?1 c ommon mo d e input volta g e ran g e ?v c m,in 2.5+(v diff/2 )?v cc -(v diff/2 )v ?2 c ommon mo d e output volta g e ran g e ?v c m,out ?v cc -v out ?v?2
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 4 of 14 2.3 ac electrical characteristics table 2-3: ac electrical characteristics v cc = 5v, t a = 0 c to 70 c unless otherwise shown. s pe c ifi c ations assume 800mv output amplitu d e level settin g s into en d terminate d 75 transmission lines. data rate = 1485mb/s unless otherwise shown. parameter condition symbol min typ max units notes te s t level s erial di g ital rate ??d c 1485 ? mb/s ? 1 a dd itive jitter 1485mb/s ? ? 5 ? ps rm s 13 differential input ? 150 ? 800 mv d iff p-p 2 differential output ? 750 800 850 mv p-p 1 output rise/fall times (20% to 80%) ? 120 250 ps 2 1 mismat c h in output rise/fall times ???1530ps?4 overshoot ? ? ? 1 8 % ? 4 duty c y c le distortion ???1530ps?1 output return loss 5mhz to 1485mhz ??17? d b24 notes: 1. rms additive jitter measured using pseudo random bit sequence (2 23 - 1). 2. measured with gennum evaluation board (eb1508). test levels: 1. 100% tested at 25c. 2. guaranteed by design. 3. correlated value. 4. tested with eb1508.
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 5 of 14 3. detailed description 3.1 input interfacing sdi/ sdi are high-impedance differential inputs (see figure 4-1 for equivalent input circuit). several conditions must be observed when interfacing to these inputs: 1. the differential input signal amplitude must be between 150 and 800mvpp. 2. the common mode voltage range must be as specified in the dc electrical characteristics table. for a 400mv input from the gs1504 hd cable equalizer, this corresponds to a common mode voltage range of between 2.7v and 4.8v. 3. for input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the typical application circuit . the gs1508 inputs are self biased, allowing for simple ac-coupling to the device. for serial digital hdtv, 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 output interfacing the gs1508 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 standard 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 hd sdi output circuit using the gs1508 to meet this specification, the output circuit shown in the typical application circuit is recommended. the values of l comp and c comp will vary depending on pcb layout, but typical values are 12nh and 0.5pf respectively. the small value of c comp can be easily swamped by parasitic pcb capacitance, so it is recommended that the ground plane be removed under the gs1508 output circuitry ( see the application information section in this data sheet for further details ). a 4.7 f capacitor is used for ac-coupling the output of the gs1508. this value is chosen to ensure that pathological signals can be coupled without a significant dc component occurring.
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 6 of 14 fi g ure 3-1: output optimize d for waveform s ymmetry, l=8.2nh, r=75 (typi c al orl=13.5 d b) fi g ure 3-2: output optimize d for return loss, l=12nh, c =0.5pf, r=75 (typi c al orl=18 d b) figure 3-1 and figure 3-2 show the eye diagram of the gs1508 output for two different output compensation conditions. figure 3-2 shows the gs1508 output optimized for wideband return loss of 18db. figure 3-1 shows the gs1508 output optimized for output waveform symmetry. in this case, the output may not exhibit a return loss of 15db. when measuring return loss at the gs1508 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 capacitor), as shown in figure 3-3 . consequently, the output capacitance of the gs1508 is dependent on the logic state of the output.
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 7 of 14 fi g ure 3-3: s tati c prote c tion dio d es 3.3 output return loss measurement to perform a practical return loss measurement, it is necessary to force the gs1508 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 gs1508 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. with this method, 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; the interpolated values are r ih = -17db and r il = -15db. 3.4 output amplitude adjustment the output amplitude of the gs1508 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 53.6% is requir ed. a 1% smt resistor should be used. the r set resistor is part of the high-speed output circuit of the gs1508. the resistor should be placed as close as possible to the r set pin. in addition, pcb capacitance should be minimized at this node by removing the pcb groundplane beneath the r set resistor and the r set pin. sdo sdo gs1508
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 8 of 14 fi g ure 3-4: gs 1508 output amplitu d e vs. 1/r s et note: for reliable operation of the gs1508 over the full temperature range, do not use an r set value below 49.9 . table 3-1: r set vs. v out r set ( ) 1/r set output swing 500.0 0.0020 0.095 150.0 0.00 6 7 0.298 75.0 0.0133 0.575 53. 6 0.0187 0.785 43.2 0.0231 0.937 1.000 0.800 0.600 0.400 0.200 0.000 0.0000 0.0050 0.0100 0.0150 0.0200 0.0250 1 / r set (mho) output swing
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 9 of 14 4. input/output circuits fi g ure 4-1: s di/ s di fi g ure 4-2: s do/ s do sdi v cc sdi 5k 20k r set sdo sdo + -
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 10 of 14 5. application information 5.1 typical application circuit fi g ure 5-1: gs 1508 typi c al appli c ation c ir c uit sdo sdo gnd v cc sdi sdi v ee r set 53.6 z 0 z 0 01 v cc l comp l comp 47 47 out out 75 75 c comp c comp pecl input 1n 75 75 v cc 100n + + 1 2 3 4 8 7 6 5 gs1508 all resistors in ohms and all capacitors in farads unless otherwise shown. table 5-1: typical application circuit component values component value comments r s et 53. 6 for 800mv output z o 50 for 50 p c b tra c e impe d an c e l c omp 12nh typi c al value. c omponent value will vary d epen d in g on p c b layout c c omp 0.5pf typi c al value. c omponent value will vary d epen d in g on p c b layout
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 11 of 14 5.2 pcb layout special attention must be paid to component layout when designing serial digital interfaces for hdtv. figure 5-3 through figure 5-6 show the artwork for a four-layer printed circuit evaluation board for the gs1508. the schematic is shown in figure 5-2 . 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 gs1508 output components to minimize parasitic capacitance ? the pcb ground plane is removed under the gs1508 r set pin and resistor to minimize parasitic capacitance ? input and output bnc connectors are surface-mounted in-line to eliminate a transmission line stub caused by a bnc mounting via high-speed traces, which are curved to minimize impedance changes due to change of pcb trace width 5.3 gs1508 evaluation board 5.3.1 eb1508 pcb schematic fi g ure 5-2: sc hemati c dia g ram for the gs 1508 evaluation boar d r10 75 l2 10n r9 75 c 17 0p5 l3 10n c 18 0p5 ed g emnt_bn c ed g emnt_bn c j4 j5 c 11 47 c 12 47 v cc v cc c 10 100n r8 75 r7 c 15 10n 75 s do s do g nd s di s di v ee r s et v cc r12 50 r13 50 c 1 6 1n 1 1 ed g emnt_bn c c 13 c 14 j 6 j7 ed g emnt_bn c v cc tp1 tp2 c 1 c 2 c 3 1 100n 1n all resistors in ohms an d all c apa c itors in fara d s unless otherwise shown. r11 53. 6 u2
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 12 of 14 5.3.2 eb-1508 pcb layout fi g ure 5-3: top layer fi g ure 5-4: g roun d layer fi g ure 5-5: power layer fi g ure 5- 6 : bottom layer
gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 13 of 14 6. package and ordering information 6.1 package dimensions fi g ure 6 -1: pa c ka g e dimensions 6.2 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 gauge 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 (16l 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 0.068 0.004 0.0098 0.014 0.019 0.189 0.196 0.157 0.244 0.229 0.150 0.050 bsc 0.0075 0.0098 0.016 0.034 0.0215 ref 0 8 7 bsc part number package temperature pb-free and green gs 1508- c kae3 8-pin s oi c 0 c to 70 c yes gs 1508- c tae3 8-pin s oi c , tape & reel (250p c ) 0 c to 70 c yes
ottawa 232 herzber g roa d , s uite 101 kanata, ontario k2k 2a1 c ana d a phone: +1 ( 6 13) 270-0458 fax: +1 ( 6 13) 270-0429 calgary 3553 - 31st s t. n.w., s uite 210 c al g ary, alberta t2l 2k7 c ana d a phone: +1 (403) 284-2 6 72 united kingdom north buil d in g , wal d en c ourt parsona g e lane, bishop?s s tortfor d hertfor d shire, c m23 5db unite d kin gd om phone: +44 1279 714170 fax: +44 1279 714171 india #208(a), nirmala plaza, airport roa d , forest park sq uare bhubaneswar 751009 in d ia phone: +91 ( 6 74) 6 53-4815 fax: +91 ( 6 74) 259-5733 snowbush ip - a division of gennum 439 university ave. s uite 1700 toronto, ontario m5 g 1y8 c ana d a phone: +1 (41 6 ) 925-5 6 43 fax: +1 (41 6 ) 925-0581 e-mail: sales@snowbush. c om web s ite: http://www.snowbush. c om mexico 288-a paseo d e maravillas jesus ma., a g uas c alientes mexi c o 20900 phone: +1 (41 6 ) 848-0328 japan kk s hinjuku g reen tower buil d in g 27f 6 -14-1, nishi s hinjuku s hinjuku-ku, tokyo, 1 6 0-0023 japan phone: +81 (03) 3349-5501 fax: +81 (03) 3349-5505 e-mail: g ennum-japan@ g ennum. c om web s ite: http://www. g ennum. c o.jp ta i w a n 6 f-4, no.51, s e c .2, keelun g r d . s inyi distri c t, taipei c ity 11502 taiwan r.o. c . phone: (88 6 ) 2-8732-8879 fax: (88 6 ) 2-8732-8870 e-mail: g ennum-taiwan@ g ennum. c om germany hainbu c henstra?e 2 80935 muen c hen (muni c h), g ermany phone: +49-89-35831 6 9 6 fax: +49-89-35804 6 53 e-mail: g ennum- g ermany@ g ennum. c om north america western region 6 91 s outh milpitas blv d ., s uite #200 milpitas, c a 95035 unite d s tates phone: +1 (408) 934-1301 fax: +1 (408) 934-1029 e-mail: naw_sales@ g ennum. c om north america eastern region 4281 harvester roa d burlin g ton, ontario l7l 5m4 c ana d a phone: +1 (905) 6 32-299 6 fax: +1 (905) 6 32-2055 e-mail: nae_sales@ g ennum. c om korea 8f jinnex lakeview bl dg . 6 5-2, ban g i d on g , s on g pa g u s eoul, korea 138-828 phone: +82-2-414-2991 fax: +82-2-414-2998 e-mail: g ennum-korea@ g ennum. c om document identification data sheet the product is in production. gennum reserves the right to make changes to the product at any time without notice to improve reliability, function or design, in order to provide the best product possible. gs1508 hd-linx? hdtv cable driver data sheet 9500 - 6 august 2010 14 of 14 14 g ennum c orporation assumes no liability for any errors or omissions in this d o c ument, or for the use of the c ir c uits or d evi c es d es c ribe d herein. the sale of the c ir c uit or d evi c e d es c ribe d herein d oes not imply any patent li c ense, an d g ennum makes no representation that the c ir c uit or d evi c e is free from patent infrin g ement. all other tra d emarks mentione d are the properties of their respe c tive owners. g ennum an d the g ennum lo g o are re g istere d tra d emarks of g ennum c orporation. ? c opyri g ht 1998 g ennum c orporation. all ri g hts reserve d . www. g ennum. c om gennum corporate headquarters 4281 harvester roa d , burlin g ton, ontario l7l 5m4 c ana d a phone: +1 (905) 6 32-299 6 fax: +1 (905) 6 32-2055 e-mail: c orporate@ g ennum. c om www. g ennum. c om caution ele c tro s tati c s en s itive devi c e s do not open pa c ka g e s or handle ex c ept at a s tati c -free work s tation revision history version ecr pcn date changes and/or modifications 6 154757 ? au g ust 2010 c onverte d d o c ument to new format. c orre c te d fi g ure 6 -1: pa c ka g e dimensions an d or d erin g information .

▲Up To Search▲

Price & Availability of GS150810

	To Download GS150810 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .