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1 of 16 gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 gs1574a hd-linx? ii adaptive cable equalizer www.gennum.com features ? smpte 292m and smpte 259m compliant ?automatic cable equalization ? multi-standard operation from 143mb/s to 1.485gb/s ? supports dvb-asi at 270mb/s ? small footprint (4mm x 4mm) ? pb-free and rohs compliant ? manual bypass (useful for low data rates with slow rise/fall times) ? performance op timized for 270mb/s and 1.485gb/s ? typical equalized length of belden 1694a cable: 200m at 1.485gb/s, 350m at 270mb/s ?50 differential output (with internal 50 pull-ups) ? manual output mute or programmable mute based on max cable length adjust ? single 3.3v power supply operation ? operating temperature range: 0c to +70c application ? smpte 292m and smpte 259m coaxial cable serial digital interfaces description the gs1574a is a second-gener ation high-spe ed bicmos integrated circuit designed to equalize and restore signals received over 75 co-axial cable . the gs1574a is designed to support smpte 292m and smpte 259m, and is op timized for performance at 270mb/s and 1.485gb/s. the gs1574a features dc rest oration to compensate for the dc content of smpte pathological test patterns. a voltage programmable mute threshold (mcladj) is included to allow muting of the gs1574a output when an approximate selected cable length is reached for smpte 259m signals. this featur e allows the gs1574a to distinguish between low amplitude sd-sdi signals and noise at the input of the device. the serial digital outputs of the gs1574a may be forced to a mute state by applying a voltage to the mute pin. power consumption is typically 215mw using a 3.3v power supply. the gs1574a is lead-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homogeneous subcomponents are rohs compliant. figure a: gs1574a functi onal block diagram cable length adjustor carrier detect mute equalizer dc restore output agc cd mute sdo bypass sdo sdi sdi mcladj
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 2 of 16 revision history version ecr pcn date changes and/or modifications 10 156775 C august 2011 added the tape and reel part number to table 9-1: gs1574a ordering information 9 153754 C september 2009 updated to latest gennum template. 8 144435 C march 2007 added maximum power consumption to dc electrical characteristics . 7 141758 40438 august 2006 modified 200m cable length in front page features section and detailed description . 6 141576 40438 august 2006 added 200m output cable length jitter data at 1.485gb/s in ac electrical characteristics . 5 139634 38695 march 2006 corrected pad standoff height and tolerances for pad width & package dimension. corrected pad shape. 4 137744 C september 2005 convert to data sheet. corrected typing errors. corrected process to bicmos. 3 137321 C june 2005 amended notes on use of mcladj above 360 mb/s. 2 137167 C june 2005 rephrased rohs compliance statement. 1 136885 C may 2005 corrected description of connection for agc and agc pins in the pin description table. clarified solder re flow profile descriptions. corrected minor typing errors.
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 3 of 16 contents features....................................................................................................................... ..........................................1 application.................................................................................................................... .......................................1 description.................................................................................................................... .......................................1 revision history ............................................................................................................... ..................................2 1. pin out..................................................................................................................... ..........................................4 1.1 gs1574a pin assignment .................................................................................................... ..........4 1.2 gs1574a pin descriptions .................................................................................................. ...........4 2. electrical characteristics .................................................................................................. ..........................6 2.1 absolute maximum ratings .................................................................................................. ........6 2.2 dc electrical characteristics ...... ....................................................................................... ...........6 2.3 ac electrical characterist ics ............................................................................................. ...........7 3. solder reflow profiles...................................................................................................... ............................9 4. test circuit ................................................................................................................ .................................... 10 5. input / output circuits ..................................................................................................... ........................ 11 6. detailed description........................................................................................................ .......................... 13 6.1 serial digital inputs ..................................................................................................... ................. 13 6.2 cable equalization ........................................................................................................ ................ 13 6.3 programmable mute output .................................................................................................. .... 14 6.4 mute and carrier detect ................................................................................................... ........... 14 7. application information ..................................................................................................... ..................... 15 7.1 pcb layout ................................................................................................................ ....................... 15 7.2 typical application circuit ............................................................................................... ......... 15 8. package and ordering information............................................................................................ .......... 16 8.1 package dimensions ........................................................................................................ ............. 16 8.2 recommended pcb footprint .. ........... ........... ........... ........... ........... ........... ........... ........... ....... .. 17 8.3 packaging data ............................................................................................................ ................... 17 8.4 ordering information ...................................................................................................... ............. 18
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 4 of 16 1. pin out 1.1 gs1574a pin assignment figure 1-1: 16-pin qfn 1.2 gs1574a pin descriptions gs 1574a (top view) 1 vee_a vee_a s di s di 2 3 4 s do s do vee_d vee_d 12 11 10 9 a gc a gc bypa ss m c lad j 5 7 6 8 v cc _a mute c d v cc _d 13 14 15 1 6 c enter pa d ( b ottom of pa c ka g e, internally b on d e d to vee_a) table 1-1: gs1574a pin descriptions pin number name timing ty p e description 1, 4 vee_a analog power most negative power supply for analog circuitry. connect to gnd. 2, 3 sdi, sdi analog input serial digital differential input. 5, 6 agc, agc analog C external agc capacitor. connect pin 5 and pin 6 together as shown in the typical application circuit on page 13 . 7bypass not synchronous input forces the equalizing and dc restore stages into bypass mode when high. no equalization occurs in this mode. 8 mcladj analog input maximum cable length adjust. adjusts the approximate maximum amount of cable to be equalized (from 0m to the maximum cable length). the output is muted (latched to the last state) when the maximu m cable length is achieved. note: mcladj is only recommended fo r data rates up to 360mb/s. for data rates above this, mcladj should be left floating.
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 5 of 16 9 vee_d analog power most negative power supply for the digital circuitry and output buffer. connect to gnd. 10, 11 sdo , sdo analog output equalized serial digital differential output. 12 vee_d analog power most negative power supply for the digital circuitry and output buffer. connect to gnd. 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 signal input levels are lvcmos/lvttl compatible. (3.3v tolerant) when the mute pin is set high by th e application interface, the serial digital output of the device will be forced to a steady state. when the mute pin is set low, the serial digital output of the device will be active. note: this pin may be connected directly to the cd pin to allow mute on loss of carrier. 15 cd not synchronous output status signal output signal levels are lvcmos/lvttl compatible. indicates the presence of a good input signal. when the cd pin is low, a good input signal has been detected. when this pin is high, the input signal is invalid. this pin will indicate loss of carrier for data rates > 19mb/s. 16 vcc_a analog power most positive power supply for the analog circ uitry of the device. connect to +3.3v dc. C center pad C power internally bonded to vee_a. table 1-1: gs1574a pin descriptions (continued) pin number name timing ty p e description
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 6 of 16 2. electrical characteristics 2.1 absolute maximum ratings 2.2 dc electrical characteristics table 2-1: absolute maximum ratings parameter value supply voltage -0.5v to +3.6 v dc input esd voltage 2kv 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 solder reflow temperature 260c table 2-2: dc electrical characteristics v cc = 3.3v 5%, t a = 0c to 70c, 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 CCC343mwC 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 1.75 C v C mcladj dc voltage (to mute signal) C0m, t a = 25c C 1.3 C v C mcladj range C t a = 25c C 0.5 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
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 7 of 16 2.3 ac electrical characteristics mute input voltage required to force outputs to mute v mute min to mute 2.0 C C v C mute input voltage required to force outputs active v mute max to activate CC0.8vC table 2-2: dc electrical characteristics (continued) v cc = 3.3v 5%, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min ty p max units notes table 2-3: ac electrical characteristics v cc = 3.3v 5%, t a = 0c to 70c, unless otherwise shown parameter symbol conditions min ty p max units notes serial input data rate dr sdo C 143 C 1485 mb/s C input voltage swing v sdi t a =25c, differential 720 800 950 mv p-p 1 output voltage swing v sdo 100 load, t a =25c, differential C 750 C mv p-p C output jitter for various cable lengths and data rates C 270mb/s belden 1694a: 0-350m belden 8281: 0-280m C 0.2 C ui 2,5 C 1.485gb/s belden 1694a: 0-140m belden 8281: 0-100m C0.25C ui2,5 C 1.485gb/s belden 1694a: 140-200m C 0.3 C ui 4,5 output rise/fall time C 20% - 80% C 80 220 ps C mismatch in rise/fall time C C C C 30 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 1.64 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. all parts production tested. in order to guarantee jitter over the full range of specification (v cc = 3.3v 5%, t a = 0c to 70c, and 720-880mv launch swing from the sd i cable driver) the reco mmended applications circuit must be used. 3. tested on cb1574a board from 5mhz to 2ghz. 4. based on characterization data using the recommended applicati ons circuit, at v cc = 3.3v, t a = 25c, and 800mv launch swing from the sdi cable driver. 5. equalizer pathological test signal is used.
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 8 of 16 3. solder reflow profiles the device is manufactured with matte-sn terminations and is compatible with both standard eutectic and pb-free solder reflow profiles. msl qualification was performed using the maximum pb-free reflow profile shown in figure 3-1 . the recommended standard pb reflow profile is shown in figure 3-2 . figure 3-1: maximum pb-free solder reflow profile (preferred) figure 3-2: standard pb solder reflow profile 25c 150c 200c 217c 260c 250c time temperature 8 min. max 60-180 sec. max 60-150 sec. 20-40 sec. 3c/sec max 6c/sec max 25c 100c 150c 183c 230c 220c time temperature 6 min. max 120 sec. max 60-150 sec. 10-20 sec. 3c/sec max 6c/sec max
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 9 of 16 4. test circuit figure 4-1: test circuit 5. input / output circuits figure 5-1: input equivalent circuit figure 5-2: mcladj equivalent circuit gigabert 1400 ext. clock clock out data out ext. clock 1.485ghz/270mhz gs1574a test board tds 820 ch. 1 ch. 2 out in out ext. trigger 50/75 8281 or 1694a cable 3k 3.6k 3k 3.6k rc sdi sdi v cc mcladj 12.2k 150 + -
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 10 of 16 figure 5-3: output circuit figure 5-4: mute and bypass circuits figure 5-5: cd circuit 50 50 sdo sdo mute, bypass c d c d
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 11 of 16 6. detailed description the gs1574a is a high speed bi cmos ic designed to equalize serial digital signals. the gs1574a can equalize both hd and sd serial digital signals, and will typically equalize 200m of belden 1694a cable at 1. 485gb/ s and 350m at 270mb/s. the gs1574a is powered from a single +3.3v power supply and consumes approximately 215mw of power. 6.1 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. 6.2 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 st eady control voltage fo r 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 restoring the logic threshold of the equalized signal to its correct level independent of shifts due to ac coupling. the digital output signals have a nominal voltage of 750mv pp differential, or 375mv pp single ended when terminated with 50 as shown in figure 6-1 . figure 6-1: typical output voltage levels 50 50 sdo sdo +187.5mv -187.5mv v cm = 2.925v typical +187.5mv -187.5mv v cm = 2.925v typical
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 12 of 16 6.3 programmable mute output for smpte 259m inputs, the gs 1574a incorporates a progra mmable threshold output mute (mcladj). in applications where there are multiple input channels using the gs1574a, it is advantageous to have a programmable mute output to avoid signal crosstalk. the output of the gs1574a can be muted wh en the input signal decrease s below a certain input level. this threshold is determined using the input voltage applied to the mcladj pin. the mcladj pin may be left unconnected for applications where output muting is not required. 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. note: mcladj is only recomme nded for data rates up to 360mb/s. for data rates above this, mcladj should be left floating. 6.4 mute and carrier detect the gs1574a includes a mute input pin that allows the applicatio n 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 gs1574a. 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: 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 gs1574a when no valid input signal has been detected. note: if the maximum cable length is exceeded and the device is not in bypass mode the gs1574a will no t assert the cd pin even if a carrier is present.
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 13 of 16 7. application information 7.1 pcb layout special attention must be paid to compon ent layout when desi gning 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 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 gs1574a input components to minimize parasitic capacitance. ? the pcb ground plane is removed under the gs1574a output components to minimize parasitic capacitance. ? high speed traces are curved to minimize impedance changes. 7.2 typical application circuit figure 7-1: gs1574a typical application circuit gs 1574a s di c d s di vee_d mute v cc _d a gc bypa ss m c lad j 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 . vee_a a gc v cc _a s do s do vee_d 10n 1 10nf s do 4.7f 4.7f + + s do c d mute v cc bypa ss m c lad j 470nf 6 .2nh 75 s di 1f 75 1f 37.4 v cc 4 5 6 2 3 8 7 1 6 12 13 11 14 15 9 10 470nf
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 14 of 16 8. package and ordering information 8.1 package dimensions figure 8-1: package dimensions 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
gs1574a hd-linx? ii adaptive cable equalizer data sheet 33416 - 10 august 2011 15 of 16 8.2 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 on ly. final dimensions should conform to customer design rules and process optimizations. 8.3 packaging data 0.35 0.55 2.76 3.70 2.76 3.70 note: all dimensions are in millimeters. 0.65 center pad table 8-1: packaging data 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
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