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www.gennum.com gs1528 hd-linx? ii multi-rate sdi dual slew-rate cable driver gs1528 data sheet 16632 - 5 june 2005 1 of 13 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 lvpec l 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 data sheet 16632 - 5 june 2005 2 of 13 contents features ....................................................................................................................... .1 applications................................................................................................................... 1 description .................................................................................................................... 1 1. electrical characteristics ...........................................................................................3 1.1 absolute maximum ratings ............................................................................3 1.2 dc electrical characteristics ............... ...........................................................3 1.3 ac electrical characteristics .............. .............................................................4 2. pin out ..................................................................................................................... .5 2.1 pin assignment ...............................................................................................5 2.2 pin descriptions ..............................................................................................5 2.3 input/output circuits .......................................................................................6 3. detailed description ..................................... .............................................................7 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. application information............................................................................................11 4.1 pcb layout ...................................................................................................11 4.2 typical application cirucit .............................................................................11 5. package dimensions ..............................................................................................12 5.1 ordering information .....................................................................................12 6. revision history ......................................................................................................13
gs1528 data sheet 16632 - 5 june 2005 3 of 13 1. electrical characteristics 1.1 absolute maximum ratings t a = 25c unless otherwise indicated 1.2 dc electrical characteristics parameter value supply voltage -0.5v to 3.6 v dc input esd voltage 500v storage temperature range -50c < t s < 125c input voltage range (any input) -0.3 to (v cc +0.3)v operating temperature range 0c to 70c power dissipation 300mw lead temperature (soldering, 10 sec) 260c caution the gs1528 is sensitive to electrosta tic discharge. use extreme caution, observing all esd-prevention practices, during handling and assembly. the sdi inputs of the gs1528 must be protected from electr ostatic discharge and electrical overstress during the handling and operation of circuit assemblies table 1-1: dc electrical characteristics v dd = 3.3v, t a = 0c to 70c, unless otherwise shown parameter conditions symbol min typ max units notes test levels supply voltage v cc 3.135 3.3 3.465 v 5% 3 power consumption t a = 25c p d ? 160 ? mw 5 supply current t a = 25c s ?48?ma 1 output voltage common mode v cmout ?v cc - v out ?? 6 input voltage common mode v cmin 1.6 + v sdi /2 ? v cc - v sdi /2 v 5 sd/hd input v ih 2.4 ? ? v 7 v il ??0.8v 7
gs1528 data sheet 16632 - 5 june 2005 4 of 13 1.3 ac electrical characteristics table 1-2: ac electrical characteristics v dd = 3.3v, t a = 0c to 70c, unless otherwise shown parameter conditions symbol min typ max units notes test levels serial input data rate dr sdo ? ? 1.485 gb/s 2 1 additive jitter 1.485gb/s ? 15 ? ps p-p 1 270mb/s ? 25 ? ps p-p 1 rise/fall time sd/hd =0 t r , t f ? ? 220 ps 20% to 80% 1 sd/hd =1 t r , t f 400 ? 800 ps 20% to 80% 1 mismatch in rise/fall time u t r , u t f ??30 ps 1 duty cycle distortion ? ? 30 ps 1 overshoot ? ? 8 % 1 output return loss orl 15 ? ? db 1 7 output voltage swing single ended into 75 external load r set = 750 v out 750 800 850 mv p-p 1 input voltage swing differential u v sdi 300 ? 2000 mv p-p 1 test levels 1. production test at room temperature and nominal suppl y voltage with guardbands for supply and temperature ranges. 2. production test at room temperature and nominal supply volt age with guardbands for supply and te mperature ranges using correl ated test. 3. production test at room temperature 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/c haracterization data of similar product. 9. indirect test. notes: 1. tested on cb1528 board from 5mhz to 1.435ghz 2. the input coupling capacitor must be set accordingly for lower data rates.
gs1528 data sheet 16632 - 5 june 2005 5 of 13 2. pin out 2.1 pin assignment figure 2-1: 8-pin soic 2.2 pin descriptions sdi sdi v ee r set sdo sdo sd/hd v cc 1 2 3 4 8 7 6 5 gs1528 8 pin soic top view table 2-1: pin descriptions pin number name type description 1,2 sdi, sdi pecl input serial digital differential input. 4r set input external output amplitude control resistor. 6 sd/hd logic input output slew rate control. when high, the output will meet smpte259m rise/fall time specifications. when lo w, the serial outputs will meet smpte292m rise/fall time specifications. 7, 8 sdo , sdo output serial digital differential output. 3v ee power most negative power suppl y connection. connect to gnd. 5v cc power most positive power suppl y connection. connect to +3.3v.
gs1528 data sheet 16632 - 5 june 2005 6 of 13 2.3 input/output circuits figure 2-2: differential input stage (sdi/sdi ) figure 2-3: differential output stage (sdo/sdo ) ref derived using r set figure 2-4: slew rate se lect input stage (sd/hd ) v cc v cc sdi sdi 10k 10k 5k 10k v cc ref sdo sdo sd/hd v cc on chip reference
gs1528 data sheet 16632 - 5 june 2005 7 of 13 3. detailed description 3.1 input interfacing s di/sdi are high impedance differential inpu ts. (see figure 2-1 1 for equivalent input circuit). several conditions must be observed when interfacing to these inputs: 1. the differential input signal amplit ude must be between 300 and 2000mvpp. 2. the common mode voltage range must be as specified in the 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 capacito r value of 4.7f 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 292 m 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 ar e current mode, and will drive 800mv into a 75 load. these outputs are protected from acciden tal static damage with internal static protection diodes. the smpte 292m, smpte 344m and smpte 259m standards requires that the output of a cable driver ha ve 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 th e 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 4.7f capacitor is used for ac coupling the output of the gs1528. this value is chosen to ensure that pathological signals can be coupled without a significant dc component occurring.
gs1528 data sheet 16632 - 5 june 2005 8 of 13 figure 3-1: output signal for 270mb/s input figure 3-2: output signal 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 lo gic low output condition. this is because the output protection diodes act as a vara ctor (voltage controlled capacitor) 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 data sheet 16632 - 5 june 2005 9 of 13 figure 3-3: static protection diodes 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 conditio n. the actual measur ed return loss will be based on the output s 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 va lues 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 lo w) 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 gs1528
gs1528 data sheet 16632 - 5 june 2005 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: rset vs vod . for an 800mv p-p output with a nominal 7% tolerance, a value of 750 is required. a 1% smt resistor should be used. figure 3-4: output amplitude adjustment 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 th is node by removing the pcb groundplane 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 r ( ) output swing 995 608 824 734 750 800 600 884 573 1040 1100 1000 900 800 700 700 800 900 1000 r set r ( ) output swing (mv) 600 600 500
gs1528 data sheet 16632 - 5 june 2005 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 dielectr ic 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 su rface mounted in-line to eliminate a transmission line stub caused by a bnc m ounting via high speed traces which are curved to minimize impedance variations due to change of pcb trace width. 4.2 typical application cirucit sd/hd gs1528 1 2 3 4 8 7 6 5 sdi sdi vee rset sdo sdo sd/hd vcc 10n 75 5.6n 4u7 bnc vcc 75 5.6n 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 data sheet 16632 - 5 june 2005 12 of 13 5. package dimensions figure 5-1: 8 pin soic 5.1 ordering information 0.49 max 3.81 0.05 3 spaces @ 1.27 0.05 4.0 max 6.20 max 0.25 max 1 8 1.91 max 4 5 1.27 max 0.25 max 5.00 max. 0.60 max = = = 8-pin soic all dimensions are in millimetres part number package temperature pb-free and rohs compliant GS1528-CKA 8 pin soic 0c to 70c no gs1528-cta 8 pin soic tape 0c to 70c no GS1528-CKAe3 8 pin soic 0c to 70c yes gs1528-ctae3 8 pin soic tape 0c to 70c yes
caution electrostatic sensitive devices do not open packages or handle except at a static-free workstation gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 tel. +1 (905) 632-2996 fax. +1 (905) 632-5946 gennum japan corporation shinjuku green tower building 27f, 6-14-1, nish i shinjuku, shinjuku-ku, tokyo, 160-0023 japan tel. +81 (03) 3349-5501, fax. +81 (03) 3349-5505 gennum uk limited 25 long garden walk, farnham, surrey, england gu9 7hx tel. +44 (0)1252 747 000 fax +44 (0)1252 726 523 gennum corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. the sale of the circuit or device described herein does not imply any patent license, and gennum makes no representation that the circuit or device is free from patent infringement. gennum and the g logo are registered trademarks of gennum corporation. ? copyright 2002 gennum corporation. all rights reserved. printed in canada. www.gennum.com gs1528 data sheet 16632 - 5 june 2005 13 13 of 13 document identification data sheet the product is in production. gennum reserves the right to make changes to the product at any time wit hout notice to improve reliability, function or design, in order to provide the best product possible. 6. revision history version ecr date changes and / or modifications 4 136566 april 2005 updated ?green? re ferences to rohs compliant. 5 137163 june 2005 rephrased rohs compliance statement.

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