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asm3p2760a low power peak emi reducing solution ?2010 scillc. all rights reserved . publication order number: january 2010 C rev. 2 asm3p2760 /d features generates an emi optimized clock signal at the output. 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. generates a 1x low emi spread spectrum clock of the input frequency. frequency deviation: 0.65% @ 8mhz . available in 6 - pin tsot - 23, 8 - pin soic and 8 - pin tssop packages. product description the asm3p2760a is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. the asm3p2760a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals . the asm3p2760a 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 asm3p2760a uses the most efficient and optimized modulation profi le approved by the fcc and is implemented by using a proprietary all digital method. the asm3p2760a 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 . ? appli cations the asm3p2760a is targeted towards all portable devices with very low power requirements like mp3 players and digital still cameras . key specifications description specification supply voltages v dd = 3.3v / 2.5v cycle - to - cycle jitter 200ps (max) output duty cycle 45/55% modulation rate equation f in /256 frequency deviation 0.65% @ 8mhz block diagram xin modout vss frequency divider feedback divider modulation phase detector loop filter vco output divider pll vdd pd crystal oscillator xout
asm3p2760a rev. 2 | page 2 of 12 | 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 lo w to enable power - down mode. connect to vdd if not used. 2 xout o crystal connection. if using an external reference, this pin must be left unconnected. 3 xin / clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 4 vdd p power supply for the entire chip . 5 modout o spread spectrum clock output. 6 vss p ground connection. xout 1 2 3 4 5 6 asm3p2760a pd xin / clkin vdd modout vss
asm3p2760a rev. 2 | page 3 of 12 | www.onsemi.com pin configuration (8 - pin soic and tssop packages) pin description pin# pin name type description 1 xin / clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 2 xout o crystal conne ction. if using an external reference, this pin must be left unconnected. 3 pd i power - down control pin. pull low to enable power - down mode. connect to vdd if not used. 4 nc - no connect. 5 vss p ground connection. 6 modout o spread spectrum clock ou tput. 7 nc - no connect. 8 vdd p power supply for the entire chip . modulation profile specification description specification frequency range for 2.5v supply 6mhz < clkin < 12mhz for 3.3v supply 6mhz < clkin < 13mhz modulation equ ation f in /256 frequency deviation 0.65% @ 8mhz xin / clkin vss modout nc xout 1 2 3 4 5 6 7 8 asm3p2760a pd nc vdd
asm3p2760a rev. 2 | page 4 of 12 | www.onsemi.com 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 t0 +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 fo r prolonged periods of time may affect device reliability. dc electrical characteristics for 2.5v supply (test condition: all parameters are measured at room temperature (+25c) unless otherwise stated . ) symbol parameter min typ max unit v il i nput low voltage vss - 0.3 - 0.8 v v ih input high voltage 2.0 - vdd+0.3 v i il input low current - - - 35 a i ih input high current - - 35 a i xol xout output low current (@ 0.5v, v dd = 2.5v) - 3 - ma i xoh xout output high current (@ 1.8v, v dd = 2.5v) - 3 - ma v ol output low voltage (v dd = 2.5v, i ol = 8ma) - - 0.6 v v oh output high voltage (v dd = 2.5v, i oh = 8ma) 1.8 - - v i dd static supply current 1 - - 10 a i cc dynamic supply current (2.5v, 8mhz and no load) - 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 - 50 - ? n otes: 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 chara cteristics 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 input frequency = 6mhz - 1.0 - % input frequency = 12mhz - 0.45 - t lh 1 output rise time (mea sured from 0.7v to 1.7v) 0.4 1.2 1.4 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) - - 200 ps t d output duty cycle 45 50 55 % n ote: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2760a rev. 2 | page 5 of 12 | www.onsemi.com dc electrical c haracteristics for 3.3v supply (test condition: all parameters are measured at room temperature (+25c) unless otherwise stated.) 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 inpu t low current - - - 35 a i ih input high current - - 35 a i xol xout output low current (@ 0.4v, v dd = 3.3v) - 3 - ma i xoh xout output high current (@ 2.5v, v dd = 3.3v) - 3 - ma v ol output low voltage (v dd = 3.3 v, i ol = 8ma) - - 0.4 v v oh output high volta ge (v dd = 3.3 v, i oh = 8ma) 2.5 - - v i dd static supply current 1 - - 10 a i cc dynamic supply current (3.3v, 8mhz and no load) - 3.0 - 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 - 45 - ? n otes: 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 input frequency 6 - 13 mhz modout output fr equency 6 - 13 mhz f d frequency deviation input frequency = 6mhz - 1.0 - % input frequency = 13mhz - 0.4 - t lh 1 output rise time (measured at 0.8v to 2.0v) 0.5 1.3 1.5 ns t hl 1 output fall time (measured at 2.0v to 0.8v) 0.4 1.0 1.2 ns t jc jitte r (cycle - to - cycle) - - 200 ps t d output duty cycle 45 50 55 % note: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2760a rev. 2 | page 6 of 12 | www.onsemi.com typical crystal oscillator circuit typical crystal specifications fundamental at cut parallel resonant cryst al nominal frequency 8.000mhz frequency tolerance 50ppm or better at 25c operating temperature range - 25c to +85c storage temperature - 40c to +85c load capacitance 18pf shunt capacitance 7pf maximum esr 25 r1 = 510? c1 = 27 pf c2 = 27 pf crystal
asm3p2760a rev. 2 | page 7 of 12 | 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 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
asm3p2760a rev. 2 | page 8 of 12 | 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
asm3p2760a rev. 2 | page 9 of 12 | 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 0.03 3 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
asm3p2760a rev. 2 | page 10 of 12 | www.onsemi.com ordering information part number marking package typ e temperature asm3p2760af - 06or e4ll 6 - pin tsot - 23, tape & reel, pb free commercial asm3p2760af - 08tt 3p2760af 8 - pin tssop, tube, pb free commercial asm3p2760af - 08tr 3p2760af 8 - pin tssop, tape & reel, pb free commercial asm3p2760af - 08st 3p2760af 8 - pin s oic, tube, pb free commercial asm3p2760af - 08sr 3p2760af 8 - pin soic, tape & reel, pb free commercial asm3p2760ag - 06or e3ll 6 - pin tsot - 23, tape & reel, green commercial asm3p2760ag - 08tt 3p2760ag 8 - pin tssop, tube, green commercial asm3p2760ag - 08tr 3p2760 ag 8 - pin tssop, tape & reel, green commercial asm3p2760ag - 08st 3p2760ag 8 - pin soic, tube, green commercial asm3p2760ag - 08sr 3p2760ag 8 - pin soic, tape & reel, green commercial asm3i2760af - 06or e5ll 6 - pin tsot - 23, tape & reel, pb free industrial asm3i27 60af - 08tt 3i2760af 8 - pin tssop, tube, pb free industrial asm3i2760af - 08tr 3i2760af 8 - pin tssop, tape & reel, pb free industrial asm3i2760af - 08st 3i2760af 8 - pin soic, tube, pb free industrial asm3i2760af - 08sr 3i2760af 8 - pin soic, tape & reel, pb free ind ustrial asm3i2760ag - 06or e6ll 6 - pin tsot - 23, tape & reel, green industrial asm3i2760ag - 08tt 3i2760ag 8 - pin tssop, tube, green industrial asm3i2760ag - 08tr 3i2760ag 8 - pin tssop, tape & reel, green industrial asm3i2760ag - 08st 3i2760ag 8 - pin soic, tube, gr een industrial asm3i2760ag - 08sr 3i2760ag 8 - pin soic, tape & reel, green industrial
asm3p2760a rev. 2 | page 11 of 12 | www.onsemi.com device ordering information a s m 3 p 2 7 6 0 a f - 0 8 t r licensed under u s patent # 5,488,62 7 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 = re served 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
asm3p2760a 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 products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. typical parameters which may be including typicals must be publication orderin g 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: orde rlit@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 lit erature: http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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