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. 29781 - 1 data sheet gs9008a not recommended for new designs key features ? two output pairs, adjustable from 0 to 1100mvp-p into 75 ? loads nominal 600 ps rise and fall times accepts smpte and standard ecl input levels operates from a single +5 or -5 volt supply on-chip dc restoration for low jitter 170mw power dissipation interfaces with genlinx? gs9002, gs9004a, gs9005a and gs9015a pb-free and green applications ? smpte 259m serial digital systems (4:2:2 & 4?sc) other serial digital video interfaces ? 360mb/s general purpose high sp eed driver applications pin connections description the genlinx? gs9008a is a bipolar integrated circuit designed to drive two 75 ? co-axial cables at data rates exceeding 400mb/s. it di rectly interfaces with other genlinx? devices and can also be used as a general purpose high speed cable driver. while there are no plans to discontinue the gs9008a, gennum has developed a successor product with improved features and performance ca lled the gs9028. the gs9028 is recommended for new designs. the differential inputs are ac-coupled and internally dc- restored which allows correct passage of pathological check codes associated with the serial digital standards. even though the inputs are ac coupled, static protection diodes at each input restrict the dc differential so that if the driving source uses the opposite polarity power supply, external dc blocking capacitors must be used. correctly terminated output si gnal levels are adjustable from as low as 0mv to as high as 1100mv with little change in other performance parameters. performance is guaranteed for output levels between 600mv and 1000mv. the gain of the output stages is varied by adjusting the v set voltage with respect to an internal band gap reference voltage v ref . the gs9008a is packaged in an 8 pin soic, and operates from a single +5 or -5 volt supply consuming typically only 170mw of power. ordering information functional block diagram input v set v ee v ref v cc output 1 output 1 input 8 1 4 3 6 5 7 2 gs9008a part number package type temperature range pb-free and green gs9008acka 8 pin soic 0 to 70c no GS9008ACKAE3 8 pin soic 0 to 70c yes output 1 output 1 gs9008a input v set input buffer & dc restore v ref input gain control v cc (gnd) gnd (v ee ) band-gap reference output driver genlinx ? gs9008a cable driver with two adjustable outputs
gennum corporation 29781 - 1 2 of 4 gs9008a not recommended for new designs absolute maximum ratings gs9008a cable driver ? dc electrical characteristics conditions: v s = 5v, t a = 0c to 70c, r l = 150 ? to gnd and 144 ? ac coupled unless otherwise shown gs9008a cable driver ? ac electrical characteristics conditions: v s = 5v, t a = 0c to 70c, r l = 150 ? to gnd and 144 ? ac coupled unless otherwise shown parameter value supply voltage (vs) 5.5v input voltage range (any input) v s -0.5v power dissipation 300mw operating temperature range 0c t a 70c storage temperature range -65c t s 150c lead temperature (soldering, 10 sec) 260c parameter symbol conditions min typ max units notes supply voltage v s 4.5 5.0 5.5 volts power consumption p d 4 x150 ? loads dc 1% accuracy, t a = 25c v set = (0.667) v ref - 170 190 mw supply current s1 -6267ma supply current s2 dc no loads, t a = 25c - 16 20 ma reference voltage v ref 10 k ? to ground - 1.2 - volts parameter symbol conditions min typ max units notes input signal amplitude v in 700 800 1000 mvp-p input signal rise/fall times t r ,t f - - 750 ps output amplitudes across 75 ? load (see note 1) v out v set = (0.5) v ref 540 600 660 mvp-p note 1 & 2 v set = (0.667) v ref 720 800 880 mvp-p note 1 & 2 v set = (0.833) v ref 900 1000 1100 mvp-p note 1 & 2 output amplitude temperature coefficient (see note 2) t c v set = (0.5) v ref - 25 100 ppm/c v set = (0.667) v ref - -12 80 ppm/c v set = (0.833) v ref - -45 80 ppm/c output rise/fall times (20% to 80%) t r ,t f v set = (0.5) v ref 400 630 800 ps v set = (0.667) v ref 400 575 800 ps v set = (0.833) v ref 400 530 800 ps output overshoot t r = t f = 600 ps - 0 - % see figure 3 jitter t j at 270mb/s - - 25 ps propagation delay t p -1-ns 1. v out is measured across a correctly terminated load, back matched to the device. the peak to peak voltage of the device itself is 2 x v out . 2. v out is proportional to v set and v set may be an external low impedance, high stability supply. in this case the amplitude temperature coefficient will not be guaranteed.
gennum corporation 29781 - 1 3 of 4 gs9008a not recommended for new designs input/output circuits figure 1 input circuit (pins 6 and 7) figure 2 output circuit (pins 1 and 2) all resistors in ohms, all capacitors in microfarads unless otherwise stated. figure 3 typica l application circuit all resistors in ohms, all capacitors in microfarads unless otherwise stated. figure 4 split supply interfacing v cc 0.5p serial inputs 400 v cc v ref1 v ref1 + v ref2 v cc 400 400 v out v out v cc v cc input signal 10k +5v 150 1.0 0.1 input signal 1.0 output -1 (75 ?) output -1 (75 ?) output level adjust 1.8p 68 1.8p 68 8 1 4 3 6 5 7 2 + 10 0.1 150 gs9008a +5v -5v 6 7 0.1f 0.1f -2v ecl driver gs9008a
29781 - 1 4 of 4 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 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 responsibility for the use of any circuits described herein and makes no representations that th ey are free from patent infringement. ? copyright october 2003 gennum corporation. all rights reserved. printed in canada. gs9008a caution electrostatic sensitive devices do not open packages or handle except at a static-free workstation document identification preliminary data sheet the product is in a preproduction phase and specifications are subject to change without notice. not recommended for new designs revision history version ecr date changes and/or modifications 0 132427 october 2003 new document 1 134030 june 2004 added lead-free and green information.
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