_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, pl ease contact maxim direct at 1-888-62-62, or visit maxims esite at maxim-iccom spread-spectrum clock generators max31c80/MAX31D80 general description the max31c80/MAX31D80 are spread-spectrum clock generators that contain a phase-locked loop ( that generates a m to 13m clock rom an input clock or crstal the can proide a spread-spec- trum don-dithered (MAX31D80 or center-dithered (max31c80 reuenc-modulated clock the deices also uer the incoming clock and proide this output on a separate pin the max31c80/MAX31D80 are proided in a 10-pin td package and operate oer a ull -0 n c to 1 n c automotie temperature range deices can e actor programmed or multiple cominations o input and out- put reuencies (see the ordering information tale a lo-cost lo-reuenc crstal can e used at the input to generate reuencies up to 13m features s 2mhz to 134mhz spread-spectrum clock generator s input can be either an mhz to 34mhz crtal or mhz to 134mhz clock s actor-rorammale utput reuencie in 2mhz to 134mhz ane s o-cot crtal at o reuenc ed to generate hih reuencie s n-board i capale o spread-spectrum reuenc modulation s on- or center-ither spread-spectrum reuenc modulation s er-coniurale spread-spectrum ither manitude s o ccle-to-ccle itter s 33 suppl oltae s emperature ane -4 n c to 12 n c s small ackae 1-in 3mm 3mm mm applications raphics cards et-top oes automotie notainment rinters 19-5214; rev 0; 4/10 orderin normation xxx = factory-programmae otpt freency and diter rate ee te eector ide tae enote a ead-free/ro-compiant pacage = ape and ree = xpoed pad elector uide appears at end of data seet em ge ihe me i-cge m31c t- -0 n c to 1 n c center 10 td- max31c80t-t -0 n c to 1 n c center 10 td- m31 t- -0 n c to 1 n c don 10 td- MAX31D80t-t -0 n c to 1 n c don 10 td- downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 2 ______________________________________________________________________________________ tree eyond toe ited nder ote axim m rating may cae permanent damage to te device ee are tre rating ony and fnctiona operation of te device at tee or any oter condition eyond toe indicated in te oper ationa ection of te pecification i not impi ed xpore to aote maximm rating condition for extended period may affect device reiaiity oltage ange on cc elatie to d -03 to 3 oltage ange on an ther in elatie to d -03 to ( cc 03 continuous oer dissipation (t a 0c 10-in td (derate m/c aoe 0c 11m torage temperature ange - n c to 13 n c ead temperature (soldering 10s 300 n c oldering temperature (relo 0 n c ecmmee eig ciis (t a -0 n c to 1 n c bse mimm igs ot to exceed 4 mee smb ciis mi m is uppl oltage cc 30 33 3 nput ogic 0(m0 and m1 -03 0 cc nput ogic 1(m0 and m1 0 cc cc 03 nput ogic nconnected(m0 and m1 imits are in case user ants to orce oltage instead o unconnecting this pin 0 cc 0 cc nput ogic 0 or x1 x1 -03 03 cc nput ogic 1 or x1 x1 0 cc cc 03 xt oad c xt 1 p ct oad c ct m p ct m 1 p m p ct 101m 10 101m p ct p 13m crstal reuenc 8 3 m clock nput reuenc 8 13 m crstal x 0 i clock nput dut ccle dc 0 0 crstal arallel oad capacitance c c 18 p downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 _______________________________________________________________________________________ 3 c eecic chceisics (30 p cc p 3 t a -0 n c to 1 n c unless otherise noted c eecic chceisics (30 p cc p 3 t a -0 n c to 1 n c unless otherise noted mee smb ciis mi m is uppl current dd m ct 100m don dithered c 10p ma nput eakage (m0 and m1 m d or cc q 1 f a o-eel utput oltage (xt and ct 10ma 0 igh-eel utput oltage (xt and ct -10ma cc - 0 nput capacitance (x1 and x c p mee smb ciis mi m is ct dut ccle ctdc c ct p 0 0 xt dut ccle xtdc c xt p t a n c cc 33 0 0 ise time t c ct p 1 ns all time t c ct p 1 ns dither ate ange d actor programmale 0 0 k dither ate accurac - eak ccle-to-ccle itter t ct 100m 10000 ccles t a n c ps oer-p time t cc alid to output actie t a n c cc 33 1 ms downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 4 ______________________________________________________________________________________ pical operatin caracteristics ( cc 33 t a c unless otherise noted frequency spectrum at 100mhz with down dither max31c80 toc07 frequency (mhz) attenuation (db) 100 98 -0 -0 -30 -0 -10 0 -0 9 cout 100mhz center ither -3 -1db frequency spectrum at 122mhz with center spread max31c80 toc06 frequency (mhz) attenuation (db) 123.2 121.2 0 0 30 20 10 0 60 11.2 cout 122mhz center ither 1. 1.23db duty cycle vs. temperature max31c80 toc05 temperature (c) duty cycle (%) 110 60 10 42 44 46 48 50 52 54 56 58 6040 -40 f clkut 100m cc 36 cc 33 cc 30 duty cycle vs. supply voltage max31c80 toc04 supply voltage (v) duty cycle (%) 3.4 3.2 42 44 46 48 50 52 54 56 58 6040 3.0 3.6 clout 100m t a 125c t a 25c t a 40c supply current vs. output frequency max31c80 toc03 output frequency (mhz) supply current (ma) 104 80 5 3 5 10 15 0 5 0 8 cc 33 supply current vs. temperature max31c80 toc02 temperature (c) supply current (ma) 110 85 -15 10 35 60 17 19 21 23 25 27 29 15 -0 n 27m clut 100m cc 36 cc 33 cc 30 supply current vs. supply voltage max31c80 toc01 supply voltage (v) supply current (ma) 3.4 3.2 17 1 21 23 2 271 3.0 3. n 27m clout 100m t a 12c t a 2c t a 40c downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 _______________________________________________________________________________________ in coniuration 1 3 4 10 8 7 x2v cc gnd x1 v cc gnd 2 9 smsel1 + smsel0 ep 5 6 xout clkout tdfn top view max31c80MAX31D80 crystal oscillator programmable pll with spread spectrum spread-spectrum magnitude control clkout(f clkout = 2mhz to 134mhz) out(f out = f in ) cc f in gnd cc 12 smsel smsel1 mhz to 134mhz clock or mhz to 34mhz crystal max31c80MAX31D80 i me ci 1 x1 crstal drie/clock nput a crstal ith the proper loading is connected across x1 and x nstead o a crstal a clock can e applied at the x1 input no clock or crstal is present then no clock is output at either xt or ct m0 m1 pread-pectrum magnitude elect these are three-state digital inputs to determine the spread-spectrum magnitude tales 1 and proide details or coniguration o these pins or don and center dither respectiel i me ci 3 8 cc uppl oltage d round ct clock utput pread-spectrum-capale digital output clock rom the xt crstal uered utput uered digital output o the input crstal or clock 10 x crstal drie utput a crstal ith the proper loading is connected across x1 and x a clock is applied at the x1 input then x should e let open circuit posed ad connect to d downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 ______________________________________________________________________________________ detailed description the max31c80/MAX31D80 modulate an input clock to generate a center-dithered or don-dithered spread- spectrum output an 8m to m crstal or 8m to 13m oscillator input is applied to the deice an internal dithers the output clock at a user-select- ale magnitude to produce a don-dithered or center- dithered output clock the output clocks reuenc is programmale rom m to 13m the deices also uer the incoming clock and proide this output on a separate pin spread-spectrum diter manitude the MAX31D80 can generate don-dithered magnitudes up to -3 the max31c80 can generate center-dithered magnitudes up to p 1 the desired magnitude is selected using the input pins m1 and m0 as shon in tales 1 and a poer ccle is reuired ater each change o the dither magnitude or the changes to take eect ale 1 spread-spectrum mode and manitude select or on ither ale 2 spread-spectrum mode and manitude select or center ither smse1 smse se-secm mgie seece se-secm ihe me seece 0 0 pread-pectrum disaled 0 nconnected 0 to -0 don dither 0 1 0 to -03 nconnected 0 0 to -0 nconnected nconnected 0 to -0 nconnected 1 0 to -10 1 0 0 to -1 1 nconnected 0 to -0 1 1 0 to -30 smse1 smse se-secm mgie seece se-secm ihe me seece 0 0 pread-pectrum disaled 0 nconnected -0 to 0 center dither 0 1 -03 to 03 nconnected 0 -0 to 0 nconnected nconnected -0 to 0 nconnected 1 -10 to 10 1 0 -1 to 1 1 nconnected /a 1 1 /a downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 _______________________________________________________________________________________ figre 1 pread-pectrm freency odation on itered figre 2 pread-pectrm freency odation enter itered f clkout f clkout - (0.25% to 3%) down dithered (MAX31D80) if smsel0 = smsel1 = 0 frequency time dither amount(-0.25% to -3.0%) 1 dither cycle rate f clkout + (0.25% to 1.5%) f clkout - (0.25% to 1.5%) f in center dithered (max31c80) if smsel0 = smsel1 = 0 frequency time dither amount(0.25% to 1.5%) 1 dither cycle rate downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 ______________________________________________________________________________________ factor rorammailit the max31c80/MAX31D80 can proide a ariet o re- uencies hich are aailale to users ordering the deice according to speciications listed in the eector ide tale mail the actor at cutomocillatormaim-iccom to otain custom output reuencies or speciic input reuencies not mentioned in the eector ide tale applications normation oer-suppl decouplin to achiee est results it is highl recommended that a decoupling capacitor e used on the c poer-suppl pins tpical alues o decoupling capacitors are 001 f and 01 f se a high-ualit ceramic surace-mount capacitor and mount it as close as possile to the cc pins o the c to minimie lead inductance v cc v cc valid output valid output valid t pup xoutclkout figre oer-p iming selector guide enote a ead-free/ro-compiant pacage ackae normation or the latest package outline inormation and land patterns go to maim-iccompackae ote that a or - in the package code indicates o status onl ackage draings ma sho a dierent sui character ut the draing pertains to the package regardless o o status cge e cge ce cme 10 td- t10331 21-13 i eec mhz eec mhz ihe e khz ihe e m31c t- 100 31 center max31c80t-00 30 30 center m31 t- 100 31 don MAX31D80t-003 1 1 don downloaded from: http:///
spread-spectrum clock generators max31c80/MAX31D80 axim cannot ame reponiiity for e of any circitry oter tan circitry entirey emodied in a axim prodct o circit patent icene are impied axim reerve te rigt to cange te circitry and pecification itot notice at any time maim nterated roducts 10 san gariel drie sunnale ca 08 08-3-00 ? 010 maim ntegrated roducts maim is a registered trademark o maim ntegrated roducts nc eision istor eisi mbe eisi e escii ges chge 0 /10 nitial release downloaded from: http:///
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