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: october 2001 document no. 20581 - 0 preliminary data sheet gs9024c features features features features ? automatic cable equalization fully compatible with smpte 259m typically equalizes greater than 350m of high quality cable at 270mb/s signal strength indicator output data muting when input data is lost output 'eye' monitor (oem) with large signal amplitude and power down option low power: 240mw at 5v 14 pin soic package programmable output data squelch for max cable length limiting carrier detect with programmable threshold level serial data output "high z" select to allow muxing of eq inputs applications applications applications applications front-end cable equalization for digital video systems; input equalization for serial digital distribution amplifiers, routers, production switchers and other receiving equipment. description description description description the gs9024c is a high performance automatic cable equalizer designed for serial digital data rates from 143 mb/s to 360mb/s. the gs9024c receives either single-ended or differential serial data and outputs equalized differential signals at pecl levels (800mv). the gs9024c provides up to 40db of gain at 200mhz which will typically result in equalization of greater than 350m at 270mb/s of belden 8281 cable. the gs9024c incorporates an analog signal strength indicator/carrier detect (ssi/cd) output indicating both the presence of a carrier and the amount of equalization applied to the signal. optional external resistors allow the carrier detect threshold level to be customized to the user's requirement. the gs9024c also features selectable high z serial data outputs eliminating the need for input muxing circuitry in routers. in addition, the gs9024c provides an 'output eye monitor' (oem) which allows the verification of signal integrity after equalization, prior to reslicing. the gs9024c operates from a single +5v or -5v power supply and consumes only 240mw of power. packaged in a small 14 pin soic, the gs9024c is ideal for router applications where high density component placement is required. block diagram block diagram block diagram block diagram ordering information ordering information ordering information ordering information part number package temperature GS9024C-CKB 14 pin soic 0c to 70c gs9024c-ctb 14 pin soic tape 0c to 70c sdi sdi oem agc cd_adj + - + - + - + - high z sdo sdo ssi/cd variable gain eq stage auto eq control eye monitor ? gs9024c gs9024c gs9024c gs9024c automatic cable equalizer automatic cable equalizer automatic cable equalizer automatic cable equalizer
gennum corporation 20581 - 0 2 gs9024c absolute maximum ratings absolute maximum ratings absolute maximum ratings absolute maximum ratings parameter value supply voltage 5.5v input voltage range (any input) v cc +0.5 to v ee -0.5v operating temperature range 0c t a 70c storage temperature range -65c t s 150c lead temperature (soldering, 10 sec) 260c dc electrical characteristics dc electrical characteristics dc electrical characteristics dc electrical characteristics v cc = 5v, v ee = 0v, t a = 0c to 70c unless otherwise shown. parameter symbol conditions min typ 1 max units notes test level supply voltage v cc 4.75 5.0 5.25 v power consumption p d - 240 - mw 3 with oem active - 340 - mw 3 supply current s -44-ma 1 with oem active - 58 - ma 1 serial data o/p current sdo r l = 75 ? -11-ma 3 sdi/sdi common mode voltage -2.5- v 1 agc+/agc- mode voltage -2.7- v 1 oem bias potential - 4.5 - v 1 ssi/cd output current source c lm ax = 50pf r l = - - 18 a c lm ax = 50pf r l = 5k ? --110a sink -1.01.5ma high z input voltage v high 2.4 - - v 1 v low --0.8v 1 test levels 1. 100% tested at 25c. 2. guaranteed by design. 3. inferred or co-related value. notes 1. typical values are parametric norms at 25c.
gennum corporation 20581 - 0 3 gs9024c test setup test setup test setup test setup fig. 1 test setup for figure 3. fig. 2 test setup for figures 4, 5, 6, 7 and 10. ac electrical characteristics ac electrical characteristics ac electrical characteristics ac electrical characteristics v cc = 5v, v ee = 0v, t a = 0c to 70c unless otherwise shown. parameter symbol conditions min typ 1 max units notes test level data rate 143 - 360 mb/s 1 output signal swing v sdo r l = 75 ? 700 850 1000 mv 1 additive jitter t j 270mb/s, 300m - 275 - ps p-p see fig 5 5 output rise and fall times (20-80%) t r , t f 0.5 0.65 - ns 3 output duty cycle distortion -30-ps 2 input resistance r in sdi, sdi -10-k ? 2 input capacitance c in sdi, sdi -1.0- pf 2 carrier detect response time t cdon carrier applied r l = , c l 50pf on ssi/cd -3-s 2 t cdoff carrier removed r l = , c l 50pf on ssi/cd -30-s 2 high z response time t r highz -17-ns 2 input return loss at 270mhz 15 20 - db see fig 8 3 maximum equalizer gain a eq at 200mhz - 40 - db see fig 4 3, 5 test levels 1. 100% tested at 25c. 2. guaranteed by design. 3. inferred or co-related value. 4. evaluated using test setup figure 1. 5. evaluated using test setup figure 2. notes 1. typical values are parametric norms at 25c. eb9024 board gs9028 cable driver tektronix gigabert 700 analyzer tektronix gigabert 700 transmitter belden 8281 cable data data clock trigger gs9028 cable driver vertical in trigger in oscilloscope anritsu me522a or gigabert 700 transmitter belden 8281 cable data data clock eb9024 board ssi/cd cd_adj v v
gennum corporation 20581 - 0 4 gs9024c pin connections pin connections pin connections pin connections pin descriptions pin descriptions pin descriptions pin descriptions number symbol type description 1, 14 agc-, agc+ i external agc capacitor. 4, 5 sdi/sdi i differential serial digital data inputs. 8 oem o output ?eye? monitor. oem is a single ended current mode output and requires an external 50 ? pullup resistor. 9 cd_adj i carrier detect threshold adjust. 10, 11 sdo /sdo o equalized serial digital data outputs. 12 ssi/cd o signal strength indicator/carrier detect. 13 high z i the sdo /sdo outputs are high z when this pin is high. if high z functionality is not used, this input can be left floating or tied low. agc- v ee v cc sdi sdi high z sdo v ee v cc sdo cd_adj oem agc+ ssi/cd gs9024c top view 1 2 3 4 5 6 7 14 13 12 11 10 9 8
gennum corporation 20581 - 0 5 gs9024c typical performance curves typical performance curves typical performance curves typical performance curves (v s = 5v, t a = 25c unless otherwise shown.) fig. 3 maximum data rate vs. cable length - belden 8281n (see test setup in figure 1) fig. 4 equalizer gain vs. frequency fig. 5 additive jitter vs. input cable length - belden 8281 fig. 6 ssi/cd voltage vs. cable length - belden 8281 (cd_adj = 0v) fig. 7 carrier detect adjust voltage threshold characteristics fig. 8 input impedance data rate (mb/s) cable length (m) 500 400 300 200 100 0 0.5 ui output additive jitter 0.2 ui output additive jitter 0 5 10 15 20 25 30 35 40 45 50 1 10 100 1000 gain (db) frequency (mhz) 0 200 400 600 0 50 100 150 200 250 300 350 additive jitter (ps p-p) cable length (m) 270mb/s 5.00 4.50 4.00 3.50 3.00 2.50 0 50 100 150 200 250 300 350 400 450 500 ssi/cd output voltage (v) cable length (m) 200 250 300 350 400 cd_adj voltage (v) cable length (m) 2.0 3.0 3.5 4.0 4.5 5.0 2.5 3000 1620 810 720 -j1 -j2 -j5 j2 j5 j1 j0.5 j0.2 -j0.2 -j0.5 frequencies in mhz, impedances normalized to 50 ? .
gennum corporation 20581 - 0 6 gs9024c fig. 9 output data waveform at 270mb/s, 300m detailed description detailed description detailed description detailed description the gs9024c automatic cable equalizer is a bipolar integrated circuit designed to equalize serial digital data signals between 30mbps and 360mbps. powered from a single +5v or -5v supply, the device consumes approximately 240mw of power. the serial data signal is connected to the input pins (sdi/sdi ) either differentially or single ended. 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 gain stage provides up to 40db of gain at 200mhz which will typically result in equalization of greater than 350m at 270mb/s of belden 8281 cable. the edge energy of the equalized 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 external differential agc filter capacitor (agc+/agc-) providing a steady control voltage for the gain stage. as the frequency response of the gain stage is automatically varied by the application of negative 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 dc restored, thereby restoring its logic threshold to its corrective level regardless of shifts due to ac coupling. the digital output signals have pecl voltage levels (800mv) and are available at pins sdo and sdo. 1. output high z a high z pin allows the data outputs to be put into a high impedance state which disconnects them from the output traces. this feature is ideal for input expansion in router applications as it eliminates the need for input muxes or crosspoints. 2. signal strength indication/carrier detect the gs9024c incorporates an analog signal strength indicator/carrier detect output (ssi/cd) which indicates both the presence of a carrier and the amount of equalization applied to the signal. the voltage output of this pin versus cable length (signal strength) is shown in figure 10. with 0m of cable (800mv input signal levels), the ssi/cd output voltage is approximately 4.5v. as the cable length increases, the ssi/cd voltage decreases linearly providing accurate correlation between the ssi/cd voltage and cable length. when the signal strength decreases to the level set at the "carrier detect threshold adjust" pin, the ssi/cd voltage goes to a logic "0" state (0.8v) and can be used to drive other ttl/cmos compatible logic inputs. in addition, when loss of carrier is detected the sdo /sdo outputs are muted (set to a known static state). fig. 10 3. carrier detect threshold adjust the threshold level at which loss of carrier is detected is adjustable via external resistors at the cd_adj pin. the control voltage at the cd_adj pin is set by a simple resistor divider circuit. the threshold level is adjustable from 200m to 350m. by default (no external resistors), the threshold is typically 320m. connecting this pin to ground disables the sdo/sdo muting function and allows for maximum possible cable length equalization. this feature is designed for use in applications such as routers where signal crosstalk and circuit noise cause the equalizer to output erroneous data when no input signal is present. this problem is not solved by using a 0 1 2 3 4 5 50 100 150 200 250 300 350 400 450 500 ssi/cd output voltage (v) cable length (m) 0 cd_adj control range
gennum corporation 20581 - 0 7 gs9024c carrier detect function with a fixed internal reference because the signal to noise ratio on the circuit board may be significantly less than the default signal detection level set by the on- chip reference. to solve this problem, the gs9024c provides a user adjustable threshold to meet the unique conditions that exist in each user's application. override and internal default settings are provided to give the user total flexibility. 4. output eye monitor the gs9024c provides an 'output eye monitor' (oem) which allows the verification of signal integrity after equalization, prior to reslicing. the oem pin is an open collector current output that requires an external 50 ? pullup resistor. when the pullup resistor is not used, the oem block is disabled and the internal oem circuit is powered down. the oem provides a 0.25v p-p signal when driving a 5 0? oscilloscope input. 5. i/o description 5.1. high speed analog inputs (sdi/sdi ) sdi/sdi are high impedance inputs which accept differential or single-ended input drive. figure 11 shows the recommended interface when a single- ended serial digital signal is used. fig. 11 5.2. high speed outputs (sdo /sdo) sdo /sdo are current mode outputs that require external pullups (see figure 12). the output signal swings are 800mv when 75 ? resistors are used. a diode can be placed between v cc and the pullups to shift the signal levels down by approximately 0.7 volts. when the output traces are longer than 1 inch, controlled impedance traces should be used. the pullup resistors should be placed at the end of the output traces as they terminate the trace in its characteristic impedance (75 ? ). fig. 12 applications information applications information applications information applications information the typical application circuit shown on page 8 is useful for both smpte and dvb-asi signals. the two agc capacitors shown however increase the agc time constant from the original times shown in earlier smpte-only application circuits. in this case a minimum off-time of 50ms is needed when break-before-make switching is used at the input in order for the agc voltage to recover. sdi gs9024c sdi 75 ? 37.5 ? 75 ? 10nf 10nf 75 ? sdo sdo gs9024c 75 ? 75 ? v cc
20581 - 0 8 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 c-101, miyamae village, 2-10-42 miyamae, suginami-ku tokyo 168-0081, japan tel. +81 (03) 3334-7700 fax. +81 (03) 3247-8839 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 2001 gennum corporation. all rights reserved. printed in canada. gs9024c typical application circuit typical application circuit typical application circuit typical application circuit package dimensions package dimensions package dimensions package dimensions all dimensions in millimeters. high z sdo sdo cd_adj oem agc+ ssi/cd agc- v ee v cc sdi sdi v ee v cc v cc v cc v cc v cc data out data out 1 2 3 4 5 6 7 v cc 1n 10n 10n 50 75 37.5 75 75 75 75 100k pot (optional) 100n sdi input 30 - 360mb/s eye monitor output 14 13 12 11 10 9 8 gs9024c all resistors in ohms, all capacitors in farads, unless otherwise shown. 100n 0.49 max 4.0 max 6.20 max 1 7 8 14 7.62 0.05 6 spaces@ 1.27 0.05 0.25 max 1.91 max 1.27 max 0.25 max 8.75 max o.56 max = = = = = = 16 pin soic narrow revision notes: new document for 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 preliminary data sheet the product is in a preproduction phase and specifications are subject to change without notice.
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