asm3p2598a l ow power peak emi reducing solution ?2010 scillc. all rights reserved. publication order number: january 2010 C rev. 1 asm3p2598 /d features generates a 1x low emi optimized clock signal at the output. integrated loop filter components. operates with a 3.3 / 2.5v supply. operating current less than 5ma. low power cmos design. input frequency range : 60mhz to 120mhz for 2.5v 60m hz to 120mhz for 3.3v frequency deviation: 1.5 (typ) @ 85mhz output frequency. available in 6 - pin tsot - 23 package. product description the asm3p2598a is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequenc ies. the asm3p2598a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals. the asm3p2598a 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 asm3p2598a uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all digital method. the asm3p2598a 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 ?s pread spectrum clock generation . ? applications the asm3p2598a is targeted towards all portable devices with very low power requirements like mp3 players, mfp, lcd panel module and digital still cameras . key specifications description specification supply voltages v dd = 3.3v / 2.5v cycle - to - cycle jitter 360ps (typ) output duty cycle 45/55% modulation rate equation f in /2560 frequency devia tion 1.5% (typ) @ 85mhz output block diagram modout vss c lkin frequency divider feedback divider modulation phase detector loop filter vco output divider pll vdd sson
asm3p2598a rev. 1 | page 2 of 7 | www.onsemi.com clkin sson 1 2 3 4 5 6 asm3p2598a vdd modout vss nc pin configuration (6 - pin tsot - 23 package) pin description pin# pin name type description 1 sson i when sson is high, the spread spectrum is enabled and when low, it turns off the spread spectrum . connect the pin to ground when spread spectrum feature is not required. 2 nc - no connect . 3 clkin i clock input . 4 vdd p power supply for the entire chip. 5 modout o spread spectrum clock output. 6 vss p ground connection. modulation profile specifications description specification frequency range for 2.5v supply 60mhz < clkin < 120mhz for 3.3v supply 60mhz < clkin < 120mhz modulation equation f in /2560 frequency deviation 1.5 % (typ) @ 85mhz output
asm3p2598a rev. 1 | page 3 of 7 | www.onsemi.com absolute maximum rat ings symbol parameter rating unit vdd, 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 15 0 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. dc electrical characteristics for 2.5v supply symbol parameter min typ max unit v il input low voltage vss - 0.3 C 0.8 v v ih input high voltage 2.0 C vdd + 0.3 v i il input low current C C - 35 a i ih input high current C C 35 a v ol output low voltag e (vdd = 2.5v, i ol = 8 ma) C C 0.6 v v oh output high voltage (vdd = 2.5v, i oh = 8 ma) 1.8 C C v i dd static supply current 1 C 1.8 C ma i cc dynamic supply current (2.5v, 85mhz and no load) C 4.0 C ma vdd operating voltage 2.375 2.5 2.625 v t o n power - up time (first locked cycle after power - up) C C 5 ms z out output impedance C 50 C ? note: 1. clkin pin is pulled low . ac electrical characteristics for 2.5v supply symbol parameter min typ max unit clkin input frequency 60 C 120 mhz modout output fr equency 60 C 120 mhz f d frequency deviation input frequency = 60mhz C 1.6 C % input frequency = 120mhz C 1.1 C t lh 1 output rise time (measured from 0.7v to 1.7v) 0.7 1.8 2.6 ns t hl 1 output fall time (measured from 1.7v to 0.7v) 0.4 0.9 1.1 ns t jc jitter (cycle - to - cycle) C 360 C ps t d output duty cycle 45 50 55 % note: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2598a rev. 1 | page 4 of 7 | www.onsemi.com dc electrical characteristics for 3.3v supply symbol parameter min typ max unit v il input low voltage vss - 0.3 C 0.8 v v ih input high voltage 2.0 C vdd + 0.3 v i il input low current C C - 35 a i ih input high current C C 35 a v ol output low voltage (vdd = 3.3v, i ol = 8 ma) C C 0.4 v v oh output high voltage (vdd = 3.3v, i oh = 8 ma) 2.5 C C v i dd static supply current 1 C 2.2 C ma i cc dynamic supply current (3.3v, 85mhz and no load) C 4.5 C ma vdd operating voltage 3.0 3.3 3.6 v t on power - up time (first locked cycle after power - up) C C 5 ms z out output impedance C 45 C ? note: 1. clkin pin is pulled low . ac electrical characteristics for 3.3v supply symbol parameter min typ max unit clkin input frequency 60 C 120 mhz modout output frequency 60 C 120 mhz f d frequency deviation input frequency = 60mhz C 1.6 C % input f requency = 120mhz C 1.1 C t lh 1 output rise time (measured from 0.8 to 2.0v) 0.5 1.2 1.8 ns t hl 1 output fall time (measured at 2.0v to 0.8v) 0.3 0.8 1.1 ns t jc jitter (cycle - to - cycle) C 360 C ps t d output duty cycle 45 50 55 % note: 1. t lh and t hl are mea sured into a capacitive load of 15pf .
asm3p2598a rev. 1 | page 5 of 7 | www.onsemi.com package information 6 - pin tsot - 23 package symbol dimensions inches millimeters min max min max a 0.04 1.00 a1 0.00 0.004 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 bsc 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
asm3p2598a rev. 1 | page 6 of 7 | www.onsemi.com ordering information part number marking package type temperature asm3p2598af - 06 or a11 6 - pin t sot - 23, tape & reel, pb free commercial asm3p2598ag - 06 - or a12 6 - pin tsot - 23, tape & reel, green commercial asm3i2598af - 06 - or a14 6 - pin tsot - 23, tape & reel, pb free industrial asm3i2598ag - 06 - or a15 6 - pin tsot - 23, tape & reel, green industrial device ordering information a s m 3 p 2 5 9 8 a g - 06 - 0r licensed under u s patent # 5,488,627 and # 5,631,921 . o = tsot23 u = msop j=tsot26 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) 1 = reserved 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 & reel, t = tube or tray
asm3p2598a 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 r egarding the suitability of its products 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 specia l, consequential or incidental damages. typical parameters which may be provided in scillc data sheets and/or including typical s 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 - 344 - 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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