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max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier ????????????????????????????????????????????????????????????????? maxim integrated products 1 general description the max3748h multirate limiting amplifier functions as a data quantizer for sot ire hannel and igait thernet optical receiers the amplifier accepts a ide range of input oltages and proides constantleel currentmode logic m output oltages ith controlled edge speeds a receiedsignalstrength indicator ss is aailale hen the max3748h is comined ith the max3744 s transimpedance amplifier ta a receier consist ing of the max3744 and the max3748h can proide up to d ss dnamic range additional features include a programmale lossofsignal os detect an optional disale function sa and an output signal polar it reersal oto output disale can e used to implement squelch the comination of the max3748h and the max3744 allos for the implementation of all the smallformfactor s847 digital diagnostic specifications using a stan dard 4pin to4 header the max3748h is pacaged in a 3mm 3mm pin thin pacage ith an eposed pad features s sfp reference design available s 16-pin tqfn package with 3 3 ftrint s single 33 sl ltage s 6s rise an fall tie s ss f signal with prgraable threshl s rss nterface with a3 ta s tt disable s plarit select s s p-p deterinistic itter bs applications igait thernet ss transceier modules ire hannel ss transceier modules multirate o3 to o48 ss transceier modules typical operating circuits typical operating circuits continued at end of data sheet. 19-5954; rev 0; 7/11 ordering information appears at end of data sheet. for related parts and recommended products to use with this part refer to www.maxim-ic.com/ma.related a l a a a l a l max3744 tia 3-input diagnostic monitor r1 3k c10.1f in+in- rssi th disable los 0.1f outpol caz1 caz2 v cc gnd 4.k to 10k los v cchost out+ 0 0.1f out- 0 0.1f sd r th suppl filter host filter v ccr 4-pin to header host board sfp optical receiver max3748h ds1858 fr ricing eliver an rering infratin lease cntact ai direct at 1--6-6 r visit ais website at wwwai-icc downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier oersuppl oltage ange to oltage ange at 4 to oltage ange at sa oto ss a a os th to urrent ange into os ma to ma ifferential nput oltage ontinuous urrent ange at m outputs ot ot ma to ma ontinuous oer issipation t a 7 t derate 77m aoe 7 4 operating unction temperature ange t to storage amient temperature ange t s to ead temperature soldering s soldering temperature reflo ast a ratns tresses eond those listed under solute aimu m ratins ma cause permanent damae to the device . hese are stress ratins onl and functional ope ra- tion of the device at these or an other conditions eond those indicated in the operational sections of the specifications is not implied. posure to asolute maimum ratin conditions for etended periods ma affect device reliailit. tra aratrsts 7 to 33 amient temperature 4 to 8 m output load is to a tpical alues are at t a 33 unless otherise specified the data input transition time is controlled a 4thorder essel filter ith f 3d 7 7hz for all data rates of 7ps and elo and ith f 3d 7 data rate for data rates 3ps paratr s ndtns n tp a nts singlended nput esistance singleended to ote 4 8 i nput eturn oss ifferential f 3hz t is poered on 3 d nput sensitiit m ote m nput oerload max ote m singlended output esistance singleended to ote 4 8 i output eturn oss ifferential f 3hz t is poered on d ifferential output oltage 78 m ifferential output signal hen isaled outputs acoupled max applied to input ote m eterministic itter otes 3 8 pattern at 4ps 87 ps 8 pattern at 3ps 8 3 s equialent pattern at 7ps ote 4 3 3 8 pattern at ps 78 3 s equialent pattern at mps andom itter ote nput m ps ms nput m 3 ata output transition time to 8 4ps 387hz essel input filter m ps to 8 ote 8 nputeferred oise 8 f ms orequenc utoff a open 7 hz a f 8 oersuppl urrent ote 3 4 ma os disaled 37 oersuppl oise eection s f mhz d downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products 3 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier tra aratrsts cntine 7 to 33 amient temperature 4 to 8 m output load is to a tpical alues are at t a 33 unless otherise specified the data input transition time is controlled a 4thorder essel filter ith f 3d 7 7hz for all data rates of 7ps and elo and ith f 3d 7 data rate for data rates 3ps paratr s ndtns n tp a nts ss f sna at bs pattrn nte 1 os hsteresis log asst asst d os asserteassert time ote 7 f s os assert th 8 i 8 m os eassert th 8 i 8 m ss f sna at bs ntes os hsteresis log asst asst d os asserteassert time ote 7 f s o os assert eel th i 48 m o os eassert eel th i 77 3 m medium os assert eel th 8 i 3 m medium os eassert eel th 8 i 38 m high os assert eel th 8 i 8 383 m high os eassert eel th 8 i 3 m ss f sna at 1bs nte os hsteresis log asst asst d os asserteassert time ote 7 f s o os assert eel th i 3 m o os eassert eel th i m medium os assert eel th 8 i 33 m medium os eassert eel th 8 i m high os assert eel th 8 i 333 m high os eassert eel th 8 i m rss ss urrent ain a ss a ss ss mss ote 3 nputeferred ss urrent stailit ss a ss ote mt ma 7 7 f a mt ma 8 tts os output high oltage oh os 47 i to i to host 3 4 os output o oltage o os 47 i to i to host 3 4 os output urrent os 47 i to i to host 33 is poered don 4 f a sa nput high h sa nput o 8 sa nput urrent os 47 i to i to host f a downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier tra aratrsts cntine 7 to 33 amient temperature 4 to 8 m output load is to a tpical alues are at t a 33 unless otherise specified the data input transition time is controlled a 4thorder essel filter ith f 3d 7 7hz for all data rates of 7ps and elo and ith f 3d 7 data rate for data rates 3ps nte 1 uaranteed design and characterization nte eteen sensitiit and oerload all a specifications are met nte 3 the deterministic itter caused this filter is not included in the generation specifications input nte 3 s pattern as sustituted 8 pattern to determine the highspeed portion of the deterministic itter the lospeed portion of the aseline ander as otained measuring the ee idth difference eteen outputs gen erated using 8 and 3 s patterns nte andom itter as measured ithout using a filter at the input nte 6 the suppl current measurement ecludes the m output currents connecting the m outputs to a separate see igure nte the signal at the input is sitched eteen to amplitudes signalo and signalo as shon in igure nte nless otherise specified the pattern for all os detect specifications is 3 s nte mt is the input common mode ss is the current at the ss output nte 1 stailit is defined as ariation oer temperature and poer suppl ith respect to the tpical gain of the part downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier typical operating characteristics t a and 33 unless otherise noted output eye diagram (minimum input) max3748h toc09 100ps/div 100mv/div 2.7gbps, 2 23 - 1 pr, mv p-p output eye diagram (maximum input) max3748h toc08 50ps/div 100mv/div 3.2gbps, 2 23 - 1 pr, 1200mv p-p output eye diagram (minimum input) max3748h toc07 50ps/div 100mv/div 3.2gbps, 2 23 - 1 pr, 5mv p-p deterministic jitter vs. input common-mode voltage (v cc to v cc - 0.8v) max3748h toc0 6 common-mode voltage (v cc + x) deterministic itter ( - ) -0 -0 -03 -04 -0 -06 -07 -08 -0 4 6 8 0 40 -0 0 bit-error ratio vs. input voltage max3748h toc05 input voltage (mv p-p ) bit-error ratio (10 -1 ) 45 40 35 30 5 00 400 00 800 1000 100 0 0 50 random jitter vs. input amplitude max3748h toc04 differential input amplitude (mv p-p ) random jitter (p rm ) 30 0 0 3 4 7 8 0 0 0 40 random jitter vs. temperature (input level 10mv p-p ) max3748h toc03 temperature (c) random jitter (ps rms ) 9080700040300000 0 30 4 3 8 9 7 0 0 40 00 transfer function max3748h toc0 2 differential input (mv p-p ) differential output (mv p-p ) 5 4 3 2 00 200 300 400 500 00 700 800 00 0 output voltae input voltae supply current vs. temperature max3748h toc01 temperature (c) supply current (ma) 80 70 50 60 -10 0 10 0 30 40 -30 -0 10 0 30 40 50 60 70 80 0 100 0 -40 0 downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products 6 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier typical operating characteristics (continued) t a and 33 unless otherise noted 0 200100 400300 600500 700 0 400 200 600 800 100 500 300 700 900 1000 rssi current gain vs. input tia current (max3744 and max3748h) max3748h toc17 input tia current (a) output rssi current (a) los hysteresis vs. temperature (2.667bps, 2 10 - 1 prbs) max3748h toc16 temperature (c) 10log (deassert/assert) (d) 0 80 70 60 0 40 30 0 10 0 10 0 30 1 3 4 60 40 100 r th 0 r th 80 r th 80 deterministic jitter vs. input offset voltage (2.667gbps, k28. max3748h toc1 5 input offset voltage (mv p-p ) deteministi itte ( p-p ) 4 - -4 4 8 1 1 14 1 18 - output return gain vs. frequency (sdd22) (input signal level = -40db) max3748h toc14 frequency (hz) gain (db) 1g -30 -20 -10 0 10 20 30 -40 100m 10g input return gain vs. frequency (sdd11) (input signal level = -40dbm) max3748h toc13 frequency (hz) gain (db) 1g -30 -20 -10 0 10 20 30 -40 100m 10g uuiabe assert/deassert levels vs. r th max3748h toc12 r th ( ) assert/deassert (mv p-p ) 10k 1k 100 10 10 100k 100 1 deassert assert db output eye diagram at +100c (minimum input) max3748h toc11 50ps/div 100mv/div 3.2gbps, 2 23 - 1 pr, 5mv p-p output eye diagram with maximum input (data rate of 2.6667gbps) max3748h toc1 0 50ps/div 100mv/div 2.7gbps, 2 23 - 1 pr, 1200mv p-p downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier pin configuration pin description pn na fntn 4 suppl oltage oninerted nput signal m 3 nerted nput signal m th ossofsignal threshold in esistor to ground th sets the os threshold onnecting this pin to disales the os circuitr and reduces poer consumption sa isale nput mostt the data outputs are held static hen this pin is asserted high the os function remains actie hen the outputs are disaled f routed through the s88s8 con troller no additional s protection is required 7 os oninerted ossofsignal output os is asserted high hen the signal drops elo the assert threshold set the th input the output is open collector igure f routed through the s88 s8 controller no additional s protection is required 8 suppl round oto output olarit ontrol nput onnect to for an inersion of polarit through the limiting ampli fier and connect to for normal operation ot nerted ata output m ot oninerted ata output m 3 ss eceiedsignalstrength ndicator this current output can e used to otain a groundreferenced oltage proportional to photodiode current ith the max3744 connecting an eternal resistor eteen this pin and 4 a offset orrection oop apacitor onnection a capacitor connected eteen this pin and a etends the time constant of the offset correction loop tpical alue of a is f the offset cor rection is disaled hen the a and a pins are shorted together 12 1314 15 16 v cc rssi caz2caz1 gnd gnd top view losdisable ep th + 11 out+ 10 out- 9 1 2 3 4 8 6 5 outpol v cc in+ in- v cc tqfn (3mm 3mm) max3748h downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier pin description (continued) functional diagram pn na fntn a offset orrection oop apacitor onnection a capa citor connected eteen this pin and a etends the time constant of the offset correction loop tpical alue of a is f the offset cor rection is disaled hen the a and a pins are shorted together posed ad onnect the eposed pad to oard ground for optimal electrical and thermal perfor mance 50 50 out-out+ v cc 50 50 v cc 18ma disable offset correction caz1 caz2 c az rssi detect power detect rssi in- in+ th los outpol max3748h downloaded from: http:///
????????????????????????????????????????????????????????????????? maxim integrated products max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier detailed description the max3748h limiting amplifier consists of an input uffer a multistage amplifier offset correction circuitr an output uffer poerdetection circuitr and signal detect circuitr see the functional iaram input buffer the input uffer is shon in igure 3 t proides termination for each input signal and the max3748h can e or acoupled to a ta ta out put offset degrades receier performance if coupled the max3748h m input uffer is optimized for the max3744 ta gain tage the highandidth gain stage proides approimatel 3d of gain offset correction oop the max3748h is susceptile to offsets in the signal path ecause the hae high gain n communication sstems using data ith a dut ccle pulse idth distortion present in the signal or generated in the transimpedance amplifier appears as an input offset and is reduced the offset correction loop or igait thernet and ire hannel applications no capacitor is required or sot applications a is recommended this capacitor determines the loer 3d frequenc of the data path fiure 1. ower-uppl urrent easurement fiure . eassert hreshold et 1d elow the inimum receiver ensitivit for elected r fiure . nput uffer v cc i cc (supply current) i out (cml output current) 50 r th 50 max3748h 1db6db 0v signal on max deassert level min deassert level power-detect window v in time signal off 50 50 75k in+ in- 0.25pf 0.25pf v cc esd structures downloaded from: http:///
???????????????????????????????????????????????????????????????? maxim integrated products 1 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier c output buffer the max3748h limiting amplifiers m output proides high tolerance to impedance mismatches and inductie connectors the output current is approimatel 8ma the output is disaled connecting the sa pin to f the os pin is connected to the sa pin the outputs ot and ot are at a static oltage squelch heneer the input signal leel drops elo the os threshold the output uffer can e a or coupled to the load igure 4 poerdetect and ossofignal indicator the max3748h is equipped ith os circuitr hich indicates hen the input signal is elo a programmale threshold set resistor th at the th pin see the pical peratin haracteristics for appropriate resis tor sizing an aeraging peapoer detector compares the input signal amplitude ith this threshold and feeds the signal detect information to the os output hich is open collector to control oltages asst and asst define the os assert and deassert leels to preent os chatter in the region of the programmed threshold approimatel d of hsteresis is uilt into the os assertdeassert function once asserted os is not deasserted until the input amplitude rises to the required leel asst igure design procedure program the o assert threshold ternal resistor th programs the os threshold see the asserteassert eels s th graph in the pical peratin haracteristics to select the appropriate resistor elect the coupling capacitor hen acoupling is desired coupling capacitors and ot should e selected to minimize the receiers deterministic itter itter is decreased as the input lo frequenc cutoff f is decreased f or atmsot or other applications using scramled data select ot hich proides f 3hz or ire hannel igait thernet or other applications using 8 data coding select ot hich proides f 3hz efer to application ote f-1.1 hoosin -ouplin apacitors fiure 4. utput uffer fiure 5. 74 utput ircuit q3 q4 q1 v cc 50 50 q2 18ma 18ma disable disable disabledata out+out- esd structures gnd esdstructure v cc los downloaded from: http:///
???????????????????????????????????????????????????????????????? maxim integrated products 11 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier elect the offsetcorrection capacitor the capacitor eteen a and a determines the time constant of the signal path offset cancellation loop to maintain stailit it is important to eep a onede cade separation eteen f and the lofrequenc cutoff f o associated ith the offset cancellation circuit or atmsot or other applications using scramled data f 3hz so f omax 3hz therefore a f o hz or ire hannel or igait thernet applications leae pins a and a open i implementation the s847 igital iagnostic specification requires monitoring of input receie poer the max3748h and max3744 receier chipset allos for the monitoring of the aerage receie poer measuring the aerage current of the photodiode the max3744 preamp measures the aerage photodi ode current and proides the information to the output common mode the max3748h ss detect loc senses the commonmode leel of input signals and and proides a groundreferenced output signal ss proportional to the photodiode current the adantage of this implementation is that it allos the ta to e pacaged in a locost conentional 4pin to4 header the max3748h ss output is connected to an analog input channel of the s88s8 s controller to conert the analog information into a it ord the s88s8 proide the receiepoer information to the host oard of the optical receier through a ire interface the s8 allos for internal caliration of the receiepoer monitor the max3744 and the max3748h hae een optimized to achiee ss stailit of d ithin the a to a range of aerage input photodiode current to achiee the est accurac maim recommends receie poer caliration at the lo end a and the high end a of the required range see the ss urrent ain s nput ta urrent graph in the pical peratin haracteristics connecting to the dd or est use of the ss monitor capacitor and resis tor shon in the pical peratin ircuits see first graphic need to e placed as close as possile to the maim diagnostic monitor ith the ground of and the same as the s88s8 ground apacitor suppresses sstem noise on the ss signal 3 and is recommended downloaded from: http:///
???????????????????????????????????????????????????????????????? maxim integrated products 1 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier typical operating circuits (continued) max3744 tia r1 3k c10.1f in+in- th rssi disable los 0.1f outpol caz1 caz2 v cc gnd 4.7k to 10k v cc_host los out+ 0 0.1f out- 0 0.1f sd r th suppl filter host filter v cc_r -pin to header host board sfp optical receiver pin or apd v cc .v or apd reference voltage v cc .v max3748h -input diagnostic onitor ds1858 max3744 tia in+in- rssi th disable los 0.1f outpol caz1 caz2 v cc gnd los out+ 50 out- 50 c in 0.1f c out 0.1f c out 0.1f c in 0.1f serdes r th supply filter host filter v cc_rx 5-pin to header host oard sfp optical receiver pin or apd v cc .v or apd reference voltage v cc .v high-side current sense max3748h . to 10 v cc_host -input diagnostic onitor ds1858 downloaded from: http:///
???????????????????????????????????????????????????????????????? maxim integrated products 13 max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier chip information oss sie oa ordering information pacage information or the latest pacage outline information and land patterns footprints go to wwwai-iccackages ote that a or in the pacage code indicates ohs status onl acage draings ma sho a different suffi character ut the draing pertains to the pacage regardless of ohs status enotes a lead-free/ro-compliant pacae. posed pad. part tp ran pn-paa max3748ht 4 n to 8 n t paa tp paa d tn n and pattrn n t t33 1-136 -31 downloaded from: http:///
aim cannot assume responsiilit for use of an circuitr other than circuitr entirel emodied in a aim product. o circuit patent licenses are implied. aim reserves the riht to chane the circuitr and specifications without notice at an time. he parametric values min and ma limits shown in the lectrical haracteristics tale are uaranteed. ther parametric values uoted in this data sheet are provided for uidance. aim integrated products an gariel drie unnyale ca 1 ? maim ntegrated roducts maim is a registered trademar of maim ntegrated roducts nc max3748h compact, low-power, 155mbps to 4.25gbps limiti ampiier eision istory rsn nr rsn dat dsrptn pas and 7 nitial release downloaded from: http:///

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