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asm3p2669a low power peak emi reducing solutio n ?2010 scillc. all rights reserved. publication order number: january 2010 C rev. 2 asm3p2669 /d features generates a 1x low emi spread spectrum clock of the input frequency. integrated loop filter components. operates with a 3.3v / 2.5v supply. operating current less than 4ma. low power cmos design. input frequency range: 6mhz to 12mhz for 2.5v 6mhz to 13mhz for 3.3v frequency deviation: 1% @ 10mhz 6 - pin tsot - 23, 8 - pin soic and 8 - pin tssop packages. commercial, industrial and extended industrial temperature range product description the asm3p2669a is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. the asm3p2669a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals. the asm3p 2669a allows significant system cost savings by reducing the number of circuit board layers, ferrite beads and shielding that are traditionally required to pass emi regulations. the asm3p2669a uses the most efficient and optimized modulation profile approv ed by the fcc and is implemented by using a proprietary all digital method. the asm3p2669a modulates the output of a single pll in order to spread the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics . this results in significantly lower system emi compared to the typical narrow band signal produced by oscillators and most frequency generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation.? application th e asm3p2669a is targeted towards all portable devices with very low power requirements like mp3 players and digital still cameras . block diagram vss modout clkin frequency divider feedback divider modulation phase detector loop filter vco output divider pll vdd pd
asm3p2669a rev. 2 | page 2 of 11 | www.onsemi.com pin configuration (6 - pin tsot - 23 package) pin description pin# pin name type description 1 pd i power - down control pin. pull low to enable power - down mode. connect to vdd if not used. 2 nc - no connect. 3 clkin i external reference clock input. 4 vdd p power supply for the entire chip. 5 modout o spread spectrum clock output. 6 vss p groun d connection. nc 1 2 3 4 5 6 asm3p2669a pd clkin vdd modout vss
asm3p2669a rev. 2 | page 3 of 11 | www.onsemi.com pin configuration (8 - pin soic and tssop package) pin description pin# pin name type description 1 clkin i external reference clock input. 2 nc no connect. 3 pd i power - down control pin. pull low to enable power - down mo de. connect to vdd if not used. 4 nc no connect. 5 vss p ground connection. 6 modout o spread spectrum clock output. 7 nc no connect. 8 vdd p power supply for the entire chip specifications vdd (v) frequency range (mhz) modulation rate 2.5 6 - 12 f in /256 3.3 6 - 13 absolute maximum ratings symbol parameter rating unit v dd , v in voltage on any pin with respect to ground - 0.5 to +4.6 v t stg storage temperature - 65 to +125 c t a operating temperature - 40 to +85 c t s max. soldering temperature (10 sec) 260 c t j junction temperature 150 c t dv static discharge voltage (as per jedec std22 - a114 - b) 2 kv note: these are stress ratings only and are not implied for functional use. exposure to absolute maximum ratings for prolonge d periods of time may affect device reliability. clk in vss modout nc nc 1 2 3 4 5 6 7 8 asm3 p2669a pd nc vdd
asm3p2669a rev. 2 | page 4 of 11 | www.onsemi.com dc electrical characteristics for 2.5v supply symbol parameter min typ max unit v il input low voltage vss - 0.3 0.8 v v ih input high voltage 2.0 v dd +0.3 v i il input low current - 35 a i ih input high curren t 35 a v ol output low voltage (v dd = 2.5 v, i ol = 8ma) 0.6 v v oh output high voltage (v dd = 2.5 v, i oh = 8ma) 1.8 v i dd static supply current 1 10 ua i cc dynamic supply current (unloaded output) 2 2.5 ma v dd operating voltage 2.375 2.5 2.625 v t on power - up time (first locked cycle after power - up) 2 5 ms z out output impedance 40 ? notes: 1. xin / clkin pin and pd pin are pulled low . 2. v dd and xin / clkin input are stable, pd pin is made high from low. ac electrical characteristics for 2.5v supply symbol parameter min typ max unit clkin input frequency 6 12 mhz modout output frequency 6 12 mhz f d frequency deviation clkin = 6mhz 1.25 % clkin = 10mhz 1 clkin = 12mhz 0.9 t lh 1 output rise time (mea sured from 0.7v to 1.7v) 0.9 1.7 2.5 ns t hl 1 output fall time (measured from 1.7v to 0.7v) 0.6 1 1.5 ns t d output duty cycle 45 50 55 % t jc cycle - to - cycle jitter 250 400 ps note: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2669a rev. 2 | page 5 of 11 | www.onsemi.com dc ele ctrical characteristics for 3.3v supply symbol parameter min typ max unit v il input low voltage vss - 0.3 0.8 v v ih input high voltage 2.0 v dd +0.3 v i il input low current - 35 a i ih input high current 35 a v ol output low voltage (v dd = 3.3 v, i o l = 8ma) 0.4 v v oh output high voltage (v dd = 3.3 v, i oh = 8ma) 2.5 - v i dd static supply current 1 10 ua i cc dynamic supply current (unloaded output) 2.5 3 ma v dd operating voltage 2.7 3.3 3.6 v t on power - up time (first locked cycle after power - up) 2 5 ms z out output impedance 35 ? notes: 1. xin / clkin pin and pd pin are pulled low . 2. v dd and xin / clkin input are stable, pd pin is made high from low. ac electrical characteristics for 3.3v supply symbol parameter min typ max unit clkin i nput frequency 6 13 mhz modout output frequency 6 13 mhz f d frequency deviation clkin = 6mhz 1.25 % clkin = 10mhz 1 clkin = 13mhz 0.9 t lh 1 output rise time (measured from 0.8v to 2.0v) 0.7 1.3 1.7 ns t hl 1 output fall time (measured at 2. 0v to 0.8v) 0.6 0.9 1.3 ns t d output duty cycle 45 50 55 % t jc cycle - cycle jitter 300 450 ps note: 1. t lh and t hl are measured into a capacitive load of 15pf . note : all parameters are at an extended industrial temperature range unless otherwise stated . m odulation profile
asm3p2669a rev. 2 | page 6 of 11 | www.onsemi.com package information 6 - pin tsot - 23 package symbol dimensions inches millimeters min max min max a 0.0 4 1.00 a 1 0.0 0 0.0 04 0.00 0.10 a2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 h 0.005 bs c 0.127 bsc d 0.114 bsc 2.90 bsc b 0.06 bsc 1.60 bsc e 0. 0374 bsc 0.950 bsc c 0.11 bsc 2.80 bsc l 0.0118 0.02 0.30 0.50 0 4 0 4
asm3p2669a rev. 2 | page 7 of 11 | www.onsemi.com 8 - pin soic package symbol dimensions inches millimeters min max min max a1 0.004 0.010 0.10 0.25 a 0.053 0.069 1.35 1.75 a2 0.049 0.059 1.25 1.50 b 0.012 0.020 0.31 0.51 c 0.007 0.01 0 0.18 0.25 d 0. 193 bsc 4. 90 bsc e 0 . 154 bsc 3. 91 bsc e 0.050 bsc 1.27 bsc h 0. 236 bsc 6.00 bsc l 0.016 0.050 0.41 1.27 0 8 0 8 d e h d a1 a2 a l c b e
asm3p2669a rev. 2 | page 8 of 11 | www.onsemi.com 8 - pin tssop package symbol dimensions i nches m illimeters min max min max a 0.043 1.10 a1 0.002 0.006 0.05 0.15 a2 0. 033 0.037 0.85 0.95 b 0.008 0.012 0.19 0.30 c 0.004 0.008 0.09 0.20 d 0.114 0.122 2.90 3.10 e 0.169 0.177 4.30 4.50 e 0.026 bsc 0.65 bsc h 0. 252 bsc 6. 40 bsc l 0.020 0.028 0.50 0.70 0 8 0 8 e h a a1 a2 d b c l e
asm3p2669a rev. 2 | page 9 of 11 | www.onsemi.com ordering information part number marking package t ype temperature asm3p2669af - 06or h4ll 6 - pin tsot - 23, tape & reel, pb free commercial asm3p2669af - 08tt 3p2669af 8 - pin tssop, tube, pb free asm3p2669af - 08tr 3p2669af 8 - pin tssop, tape & reel, pb free asm3p2669af - 08st 3p2669af 8 - pin soic, tube, pb free asm3p2669af - 08sr 3p2669af 8 - pin soic, tape & reel, pb free asm3p2669ag - 06or h3ll 6 - pin tsot - 23, tape & reel, green asm3p2669ag - 08tt 3p2669ag 8 - pin tssop, tube, green asm3p2669ag - 08tr 3p2669ag 8 - pin tssop, tape & reel, green asm3p2669ag - 08st 3p266 9ag 8 - pin soic, tube, green asm3p2669ag - 08sr 3p2669ag 8 - pin soic, tape & reel, green asm3i2669af - 06or h5ll 6 - pin tsot - 23, tape & reel, pb free industrial asm3i2669af - 08tt 3i2669af 8 - pin tssop, tube, pb free asm3i2669af - 08tr 3i2669af 8 - pin tssop, tap e & reel, pb free asm3i2669af - 08st 3i2669af 8 - pin soic, tube, pb free asm3i2669af - 08sr 3i2669af 8 - pin soic, tape & reel, pb free asm3i2669ag - 06or h6ll 6 - pin tsot - 23, tape & reel, green asm3i2669ag - 08tt 3i2669ag 8 - pin tssop, tube, green asm3i2669a g - 08tr 3i2669ag 8 - pin tssop, tape & reel, green asm3i2669ag - 08st 3i2669ag 8 - pin soic, tube, green asm3i2669ag - 08sr 3i2669ag 8 - pin soic, tape & reel, green asm3e2669ag - 06or h7ll 6 - pin tsot - 23, tape & reel, green extended industrial asm3e2669ag - 08tt 3 e2669ag 8 - pin tssop, tube, green asm3e2669ag - 08tr 3e2669ag 8 - pin tssop, tape & reel, green asm3e2669ag - 08st 3e2669ag 8 - pin soic, tube, green asm3e2669ag - 08sr 3e2669ag 8 - pin soic, tape & reel, green ll = 2 character lot #
asm3p2669a rev. 2 | page 10 of 11 | www.onsemi.com device ordering informa tion a s m 3 p 2 6 6 9 a f - 0 8 t r licen sed under u s patent # 5,488,627 and # 5,631,921 . o = sot u = msop s = soic e = tqfp t = tssop l = lqfp a = ssop u = msop v = tvsop p = pdip b = bga d = qsop q = qfn x = sc - 70 device pin count x= automotive i= industrial p or n/c = commercial ( - 40c to +125c) ( - 40c to +85c) (0c to +70c) e= extended industrial ( - 40c to +105c) 1 = clock generator 6 = power management 2 = non pll based 7 = power management 3 = emi reduction 8 = power management 4 = ddr support products 9 = hi performance 5 = std zero delay buffer 0 = reserved o n semiconductor mixed signal product part number f = lead free and rohs compliant part g = green package, lead free, and rohs r = tape & r eel, t = tube or tray
asm3p2669a note: th is product utilizes us patent # 6,646,463 impedance emulator patent issued to pulsecore semiconductor, dated 11 - 11 - 2003 . on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitabili ty of its pr oducts for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifical ly disclaims any and all liability, including without limitation special, consequential or incidental dam ages. typical parameters which may be provided in scillc data sheets and/or including typicals must be publication ordering information literature fulfillment: literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone: 303 - 675 - 2175 or 800 - 344 - 3860 toll free usa/canada fax: 303 - 675 - 2176 or 800 - 34 4 - 3867 toll free usa/canada email: orderlit@onsemi.com n. american technical support : 800 - 282 - 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 - 3 - 5773 - 3850 on semiconductor website: www.onsemi.com order literature: http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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