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1 of 17 GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 GS2964 adaptive cable equalizer www.gennum.com key features ? smpte 424m, smpte 292m and smpte 259m compliant ? automatic cable equalization ? multi-standard operation from 143mb/s to 2.97gb/s ? performance optimized for 270mb/s, 1.485gb/s and 2.97gb/s. typical equalized length of belden 1694a cable: ? 100m at 2.97gb/s ? 140m at 1.485gb/s ? 180m at 270mb/s ? supports dvb-asi at 270mb/s ? manual bypass (useful for low data rates with slow rise/fall times) ? programmable carrier detect with squelch threshold adjustment ? standard eia/jedec logic control and status signal levels ? single 3.3v power supply operation ? 215mw power consumption (typical) ? wide temperature range of -40oc to +85oc ? small footprint qfn package (4mm x 4mm) ? drop-in compatible with the gs2974 ? pb-free and rohs compliant applications ? smpte 424m, smpte 292m and smpte 259m coaxial cable serial digital interfaces description the GS2964 is a high-speed bicmos integrated circuit designed to equalize and restore signals received over 75 coaxial cable. the device is designed to support smpte 424m, smpte292m and smpte 259m, and is optimized for performance at 270mb/s, 1.485gb/s and 2.97gb/s. the GS2964 features dc restoration to compensate for the dc content of smpte pathological test patterns. the carrier detect output pin (cd ) indicates whether a valid input signal has been detected. it can be connected directly to the mute pin to mute the output on loss of carrier. a voltage programmable threshold, which can be changed via the sq_adj pin, forces cd high when the input signal amplitude falls below the threshold. this allows the GS2964 to distinguish between low-amplitude sdi signals and noise at the input of the device. the equalizing and dc restore stages are disengaged when the bypass pin is high. no equalization occurs in bypass mode. the differential outputs can be dc-coupled to gennum 3.3v cable drivers and reclockers and to other industry-standard 3.3v cml logic. the GS2964 is footprint and drop-in compatible with existing gs2974 designs, with no additional application changes required. the device is available in a 16-pin, 4mm x 4mm qfn package. power consumption of the GS2964 is typically 215mw. the GS2964 is pb-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous subcomponents are rohs compliant.
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 2 of 17 GS2964 functional block diagram revision history version ecr pcn date changes and/or modifications 3 153913 54547 march 2010 changed esd rating from 6kv to 5kv in section 2.1 absolute maximum ratings . 2 152613 C september 2009 updates to output voltage swing specifications in table 2-2: ac electrical characteristics . 1 152312 C july 2009 converted to data sheet. 0 151929 C may 2009 conversion to preliminary data sheet. b 151798 C april 2009 updates. a 151181 C january 2009 new document. equalizer output ag c s di mute s do bypa ss c d s di s do ag c ag c s q_ad j s quel c h a d just c arrier dete c t mute d c restore
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 3 of 17 contents key features................................................................................................................... .....................................1 applications................................................................................................................... ......................................1 description.................................................................................................................... .......................................1 revision history ............................................................................................................... ..................................2 1. pin out..................................................................................................................... ..........................................4 1.1 GS2964 pin assignment ..................................................................................................... ............4 1.2 GS2964 pin descriptions ................................................................................................... .............4 2. electrical characteristics .................................................................................................. ..........................6 2.1 absolute maximum ratings .................................................................................................. ........6 2.2 dc electrical characteristics ............................................................................................. ...........6 2.3 ac electrical characteristics ............................................................................................. ...........7 2.4 typical performance curves ................................................................................................ ........8 3. input/output circuits ....................................................................................................... ...........................9 4. detailed description........................................................................................................ .......................... 10 4.1 serial digital inputs ..................................................................................................... ................. 10 4.2 cable equalization ........................................................................................................ ................ 10 4.3 serial digital outputs .................................................................................................... ............... 10 4.4 programmable squelch adjust (sq_adj) .............................................................................. 11 4.5 mute and carrier detect ................................................................................................... ........... 11 4.6 output rise/fall times .................................................................................................... ............ 12 5. application information ..................................................................................................... ..................... 13 5.1 pcb layout ................................................................................................................ ....................... 13 5.2 typical application circuit ............................................................................................... ......... 13 6. package & ordering information .............................................................................................. ............ 14 6.1 package dimensions ........................................................................................................ ............. 14 6.2 packaging data ............................................................................................................ ................... 14 6.3 recommended pcb footprint ................................................................................................. .. 15 6.4 marking diagram ........................................................................................................... ................ 15 6.5 solder reflow profiles .................................................................................................... .............. 16 6.6 ordering information ...................................................................................................... ............. 16
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 4 of 17 1. pin out 1.1 GS2964 pin assignment figure 1-1: g s2964 pin out 1.2 GS2964 pin descriptions 5 6 78 1 6 15 14 13 s di 1 2 3 4 s di s do s do 12 11 10 9 vee_a n/ c groun d pa d ( b ottom of pa c ka g e) ag c bypa ss s q_ad j vee_d v cc _a c d mute v cc _d g s 29 6 4 1 6 -pin qfn (top view) ag c n/ c table 1-1: GS2964 pin descriptions pin number name timing typ e description 1 vee_a analog power most negative power supply for analog circuitry. connect to g nd. 2, 3 sdi, sdi analog input serial digital differential input. 4, 9 n/c C C no connect. not bonded internally. 5, 6 a g c, a g c analog C external a g c capacitor. connect pin 5 and pin 6 together as shown in the typical application circuit on page 13 . 7bypassnot synchronous input forces the e q ualizing and dc restore stages into bypass mode when hi g h. no e q ualization occurs in this mode. (internal pull-down). 8 sq_adj analog input s q uelch adjust. adjusts the approximate amount of cable e q ualized before cd goes low. see section 4.4 and section 4.5 . (internal pull-down). 10, 11 sdo , sdo analog output e q ualized serial digital differential output.
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 5 of 17 12 vee_d analog power most negative power supply for the digital circuitry and output buffer. connect to g nd. 13 vcc_d analog power most positive power supply for the digital i/o pins of the device. connect to +3.3v dc. 14 mute not synchronous input control si g nal input levels are lvcmos/lvttl compatible. (3.3v tolerant) controls output behaviour on sdo and sdo . (internal pull-down). see section 4.5. 15 cd not synchronous output status si g nal output signal levels are lvcmos/lvttl compatible. indicates the presence of an input signal. see section 4.5. 16 vcc_a analog power most positive power supply for the analog circuitry of the device. connect to +3.3v dc. C center pad C power internally bonded to vee_a. table 1-1: GS2964 pin descriptions (continued) pin number name timing typ e description
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 6 of 17 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics parameter value supply voltage -0.5v to +3.6v dc input esd voltage (hbm) 5kv storage temperature range -50c < t s < 125c input voltage range (any input) -0.3 to (v cc +0.3)v operating temperature range -40c to +85c solder reflow temperature 260c table 2-1: dc electrical characteristics v cc = 3.3v 5%, t a = -40c to +85c, unless otherwise shown parameter symbol conditions min ty p max units notes supply voltage v cc C 3.135 3.3 3.465 v 5% power consumption p d t a = 25c C 215 C mw C supply current i s t a = 25c C 65 C ma C output common mode voltage v cmout t a = 25c C v cc - v sdo /2 C v C input common mode voltage v cmin t a = 25c C 2.2 C v C sq_adj dc voltage (to mute signal) C0m, t a = 25c C 3.2 C v C sq_adj range C t a = 25c C 1 C v C cd output voltage v cd (oh) carrier not present 2.4 C C v C v cd (ol) carrier present C C 0.4 v C mute input voltage re q uired to force outputs to mute v mute min to mute 2.0 C C v C mute input voltage re q uired to force outputs active v mute max to activate CC0.8vC
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 7 of 17 2.3 ac electrical characteristics table 2-2: ac electrical characteristics v cc = 3.3v 5%, t a = -40c to +85c, unless otherwise shown parameter symbol conditions min typ max units notes serial input data rate dr sdo C 143 C 2970 mb/s C input voltage swing v sdi t a =25c, differential, 270mb/s and 1.485 g b/s 720 800 950 mv p-p 1 t a =25c, differential, 2.97 g b/s 720 800 880 mv p-p 1 output voltage swing v sdo 100 load, t a =25c, differential 650 800 950 mv p-p C output jitter of various cable lengths and data rates C 270mb/s belden 1694a: 0-180m C0.2 ? ui 2 C 1.485 g b/s belden 1694a: 0-140m C0.25 ? ui 2 C2.97 g b/s belden 1694a: 0-100m C0.35 ? ui 2 output rise/fall time C 2.97 g b/s & 1.485 g b/s 20% - 80% 35 65 90 ps C 270mb/s (see section 4.6 ) mismatch in rise/fall time C C C 30 C ps C duty cycle distortion C C C C 30 ps C overshoot C C C C 10 % C input return loss C C 15 C C db 3 input resistance C single ended C 1.7 C k C input capacitance C single ended C 1 C pf C output resistance C single ended C 50 C C notes: 1. 0m cable length. 2. based on characterization data using the recommended applications circuit, at v cc = 3.3v, t a = 25c and 800mv launch swing from the sdi cable driver. 3. tested on GS2964 board from 5mhz to 3ghz.
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 8 of 17 2.4 typical performance curves vcc=3.3v, room temperature, 800mv launch swing figure 2-1: jitter vs. cable length (270mb/s) figure 2-2: jitter vs. cable length (1485mb/s) figure 2-3: jitter vs. cable length (2970mb/s) 0 100 200 300 400 500 pk-pk j itter (ps) 0 20 40 6 0 80 100 120 140 1 6 0 180 c a b le len g th (m) 0 100 pk-pk j itter (ps) 0 20 40 6 0 80 100 120 140 c a b le len g th (m) 100 pk-pk j itter (ps) 0 20 40 6 0 80 100 120 c a b le len g th (m)
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 9 of 17 3. input/output circuits figure 3-1: input e q uivalent circuit figure 3-2: sq_adj e q uivalent circuit 4k 8k 4k 8k s di s di r s q_ad j 82.4k + - figure 3-3: output circuit figure 3-4: mute and bypass circuits figure 3-5: cd circuit 50 50 s do s do mute, bypa ss c d
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 10 of 17 4. detailed description the GS2964 is a high-speed bicmos ic designed to equalize serial digital signals. the GS2964 can equalize 3gb/s, hd and sd serial digital signals, and will typically equalize 100m of belden 1694a cable at 2.97gb/s, 140m at 1. 485gb/ s and 180m at 270mb/s.the GS2964 is powered from a single +3.3v power supply and consumes approximately 215mw of power. 4.1 serial digital inputs the serial data signal may be connected to the input pins (sdi/sdi ) in either a differential or single ended configuration. ac coupling of the inputs is recommended, as the sdi and sdi inputs are internally biased at approximately 1.8v. 4.2 cable equalization the input signal passes through a variable gain equalizing stage whose frequency response closely matches the inverse of the 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 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 both an internal and an external agc filter capacitor 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 also dc restored, effectively restor ing the logic threshold of the equalized signal to its correct level independent of shifts due to ac coupling. 4.3 serial digital outputs the digital output signals have a nominal voltage of 800mv pp differential, or 400mv pp single-ended when terminated with 50 as shown in figure 4-1 .
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 11 of 17 figure 4-1: typical output voltage levels 4.4 programmable squelch adjust (sq_adj) the GS2964 incorporates a programmable squelch adjust (sq_adj) threshold. this feature can be useful in applications where there are multiple input channels using the GS2964 and the maximum gain can be limited to avoid crosstalk. the sq_adj pin acts to change the threshold of the carrier detect (cd ) pin, through voltage level variances. when the input signal drops below a certain threshold, the cd pin will be driven high, indicating that there is not a valid input signal. in order to enable automatic muting of the output of the GS2964, the cd pin should be connected directly to the mute pin. in applications where programmable squelch adjust is not required, the sq_adj pin may be left unconnected. this feature has been 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. the use of a carrier detect function with a fixed internal reference does not solve this problem, since the signal to noise ratio on the circuit board could be significantly less than the default signal detection level set by the on chip reference. 4.5 mute and carrier detect the GS2964 includes a mute input pin that allows the application interface to mute the serial digital output at any time. set the mute pin high to mute sdo and sdo . in this case, the outputs will mute regardless of the setting of the bypass pin. a carrier detect output pin (cd ) indicates the presence of a valid signal at the input of the GS2964. when cd is low, the device has detected a valid input on sdi and sdi . when cd is high, the device has not detected a valid input. note 1: cd will only detect loss of carrier for data rates greater than 19mb/s. the cd output pin may be connected directly to the mute input pin to enable automatic muting of the GS2964 when no valid input signal has been detected. 50 50 s do s do +200mv -200mv v c m = 2.9v typi c al +200mv -200mv v c m = 2.9v typi c al
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 12 of 17 note 2: if the maximum cable length is exceeded (set by the sq_adj pin) and the device is not in bypass mode, the cd pin will not be driven low, even if a carrier is present. 4.6 output rise/fall times figure 4-2: typical rise/fall time for 270mb/s data rate (vcc=3.3v, room temperature, 800mv launch swing) the GS2964 was designed to limit bandwidth as cable length is increased. during 3g (2.97gb/s) and hd (1.485gb/s) operation, the impact of this is minimal on rise and fall time over the operating range. for sd (270mb/s), the bandwidth limitation becomes more significant, particularly at longer cable lengths where a reduction in rise and fall time is observed. this means that for sd (270m b/s) operation, rise and fall times slow as shown in figure 4-2 above. this is beneficial because at 270mb/s, one unit interval is equal to 3.7ns, therefore rise and fall times less than 100ps are not required, and slower rise and fall times actually help to reduce emi. table 4-1: mute input table mute function 0 sdo and sdo operate normally 1 sdo and sdo are forced to a steady state (either high or low) table 4-2: cd output table cd input status 0 valid input on sdi, sdi pins 1 input is not valid 40 6 0 80 100 120 140 1 6 0 180 rise/fall time (ps) 0 10 20 30 40 50 6 0 70 80 90 100 110 130 150 170 c a b le len g th (m)
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 13 of 17 5. application information 5.1 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: ? pcb trace width for 3gb/s 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 GS2964 input components to minimize parasitic capacitance. ? the pcb ground plane is removed under the GS2964 output components to minimize parasitic capacitance. ? high speed traces are curved to minimize impedance changes. 5.2 typical application circuit figure 5-1: g s2964 typical application circuit g s 29 6 4 s di c d s di vee_d mute v cc _d ag c bypa ss vee_a note: all resistors in ohms, c apa c itors in fara d s, an d in d u c tors in henrys, unless otherwise note d . * value d epen d ent on layout n c ag c v cc _a s do s do n c 10n 1 10n 4u7 4u7 + + s do s do c d mute v cc bypa ss s q_ad j 470n 6 .2n* 75 s di 1u 75 1u 37r4 v cc 4 5 6 2 3 8 7 1 6 12 13 11 14 15 9 10 470n s q_ad j
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 14 of 17 6. package & ordering information 6.1 package dimensions 6.2 packaging data 4.00+/-0.05 b 4.00+/-0.05 2x 2x 0.15 0.15 c c 0.10 c 16x 0.08 c seating plane 0.85+/-0.05 0.00-0.05 0.65/2 0.65 detail b scale:nts datum a or b terminal tip 0.20 ref datum b detail b 0.65 16x 0.35+/-0.05 0.10 0.05 c a b c datum a 2.76+/-0.10 0.40+/-0.05 2.76+/-0.10 detail b center tab pin 1 area a c pin #1 identification 0.4500 parameter value package type 4mm x 4mm 16-pin qfn package drawing reference jedec m0220 moisture sensitivity level 3 junction to case thermal resistance, j-c 31.0c/w junction to air thermal resistance, j-a (at zero airflow) 43.8c/w psi, 11.0c/w pb-free and rohs compliant yes
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 15 of 17 6.3 recommended pcb footprint the center pad should be connected to the most negative power supply plane for analog circuitry in the device (vee_a) by a minimum of 5 vias. note: suggested dimensions only. final dime nsions should conform to customer design rules and process optimizations. 6.4 marking diagram 0.35 0.55 2.76 3.70 2.76 3.70 note: all dimensions are in millimeters. 0.65 center pad GS2964 xxxxe3 yyww pin 1 id xxxx - last 4 digits (excluding decimal) of sap batch assembly (fin) as listed on packing slip. e3 - pb-free & green indicator yyww - date code
GS2964 adaptive cable equalizer data sheet 51913 - 3 march 2010 16 of 17 6.5 solder reflow profiles the GS2964 is available in a pb-free package. it is recommended that the pb-free package be soldered with pb-free paste using the reflow profile shown in figure 6-1 . figure 6-1: maximum pb-free solder reflow profile 6.6 ordering information 25 c 150 c 200 c 217 c 2 6 0 c 250 c time temperature 8 min. max 6 0-180 se c . max 6 0-150 se c . 20-40 se c . 3 c /se c max 6 c /se c max part number package temperature range g s2964 g s2964-ine3 16-pin qfn -40c to 85c g s2964 g s2964-inte3 16-pin qfn tape & reel (250pcs) -40c to 85c g s2964 g s2964-inte3z 16-pin qfn tape & reel (2500pcs) -40c to 85c
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