? semiconductor components industries, llc, 2011 august, 2011 ? rev. 3 1 publication order number: ASM3P2759A/d ASM3P2759A low power peak emi reducing solution description the ASM3P2759A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. the ASM3P2759A reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals. the ASM3P2759A 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 ASM3P2759A uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all digital method. the ASM3P2759A 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 an d most frequency generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation.? applications the ASM3P2759A is targeted towards all portable devices with very low power requirements like mp3 players and digital still cameras. features ? generates an emi optimized clock signal at the output ? integrated loop filter components ? operates with a 3.3 v / 2.5 v supply ? operating current less than 4 ma ? low power cmos design ? input frequency range: 3 mhz to 5 mhz for 2.5 v 3 mhz to 6 mhz for 3.3 v ? generates a 1x low emi spread spectrum clock of the input frequency ? frequency deviation: 1% @ 3 mhz ? available in 6 ? pin tsot ? 23, 8 ? pin soic and 8 ? pin tssop packages ? these devices are pb ? free, halogen free/bfr free and are rohs compliant http://onsemi.com tsot ? 6 o suffix case 419af pin configurations 6 ? pin tsot ? 23 package (top view) see detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ordering information vss modout vdd xout pd 1 xin / clkin vdd = 3.3 v / 2.5 v supply voltages 200 ps (max) cycle ? to ? cycle jitter 45/55% output duty cycle f in /128 modulation rate equation 1% @ 3 mhz frequency deviation description specification key specifications soic ? 8 s suffix case 751bd tssop ? 8 t suffix case 948al 8 ? pin soic and tssop packages (top view) 1 vss modout vdd xout pd xin / clkin nc nc
ASM3P2759A http://onsemi.com 2 figure 1. block diagram xout xin vss crystal oscillator vdd frequency divider feedback divider pd modulation phase detector loop filter pll vco modout output divider table 1. pin description (6 ? pin tsot ? 23 package) 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 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. table 2. pin description (8 ? pin soic and tssop packages) 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 connection. 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 output. 7 nc ? no connect. 8 vdd p power supply for the entire chip.
ASM3P2759A http://onsemi.com 3 figure 2. modulation profile table 3. specification description specification frequency range for 2.5 v supply 3 mhz < clkin < 5 mhz for 3.3 v supply 3 mhz < clkin < 6 mhz modulation equation f in /128 frequency deviation 1% @ 3 mhz table 4. absolute maximum ratings 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 150 c t dv static discharge voltage (as per jedec std22 ? a114 ? b) 2 kv stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. table 5. dc electrical characteristics for 2.5 v supply (test condition: all parameters are measured at room temperature (+25 c) 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 ? vdd+0.3 v i il input low current ? ? ? 35 a i ih input high current ? ? 35 a i xol xout output low current (@ 0.5 v, vdd = 2.5 v) ? 3 ? ma i xoh xout output high current (@ 1.8 v, vdd = 2.5 v) ? 3 ? ma v ol output low voltage (vdd = 2.5 v, i ol = 8 ma) ? ? 0.6 v v oh output high voltage (vdd = 2.5 v, i oh = 8 ma) 1.8 ? ? v i dd static supply current (note 1) ? ? 10 a i cc dynamic supply current (2.5 v, 3 mhz and with no load) ? 2.0 ? ma vdd operating voltage 2.375 2.5 2.625 v t on power ? up time (first locked cycle after power ? up) (note 2) ? ? 5 ms z out output impedance ? 50 ? 1. xin / clkin and pd pin are pulled low. 2. v dd and xin / clkin input are stable, pd pin is made high from low.
ASM3P2759A http://onsemi.com 4 table 6. ac electrical characteristics for 2.5 v supply symbol parameter min typ max unit clkin input frequency 3 ? 5 mhz modout output frequency 3 ? 5 mhz f d frequency deviation input frequency = 3 mhz ? 1 ? % input frequency = 5 mhz ? 0.6 ? t lh (note 3) output rise time (measured from 0.7 v to 1.7 v) 0.5 1.0 1.2 ns t hl (note 3) output fall time (measured from 1.7 v to 0.7 v) 0.4 0.9 1.1 ns t jc jitter (cycle ? to ? cycle) ? ? 200 ps t d output duty cycle 45 50 55 % 3. t lh and t hl are measured into a capacitive load of 15 pf. table 7. dc electrical characteristics for 3.3 v supply (test condition: all parameters are measured at room temperature (+25 c) 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 ? vdd+0.3 v i il input low current ? ? ? 35 a i ih input high current ? ? 35 a i xol xout output low current (@ 0.4 v, vdd = 3.3 v) ? 3 ? ma i xoh xout output high current (@ 2.5 v, vdd = 3.3 v) ? 3 ? ma v ol output low voltage (vdd = 3.3 v, i ol = 8 ma) ? ? 0.4 v v oh output high voltage (vdd = 3.3 v, i oh = 8 ma) 2.5 ? ? v i dd static supply current (note 4) ? 10 a i cc dynamic supply current (3.3 v, 3 mhz and with no load) ? 2.5 ? ma vdd operating voltage 2.7 3.3 3.6 v t on power ? up time (first locked cycle after power ? up) (note 5) ? ? 5 ms z out output impedance ? 45 ? 4. xin / clkin and pd pin are pulled low. 5. v dd and xin / clkin input are stable; pd pin is made high from low. table 8. ac electrical characteristics for 3.3 v supply symbol parameter min typ max unit clkin input frequency 3 ? 6 mhz modout output frequency 3 ? 6 mhz f d frequency deviation input frequency = 3 mhz ? 1 ? % input frequency = 6 mhz ? 0.55 ? t lh (note 6) output rise time (measured from 0.8 to 2.0 v) 0.4 1.0 1.2 ns t hl (note 6) output fall time (measured at 2.0 v to 0.8 v) 0.4 0.9 1.0 ns t jc jitter (cycle ? to ? cycle) ? ? 200 ps t d output duty cycle 45 50 55 % 6. t lh and t hl are measured into a capacitive load of 15 pf.
ASM3P2759A http://onsemi.com 5 figure 3. typical crystal oscillator circuit r1 = 510 crystal c2 = 27 pf c1 = 27 pf table 9. typical crystal specifications fundamental at cut parallel resonant crystal nominal frequency 4.800 mhz frequency tolerance 50 ppm or better at 25 c operating temperature range ? 25 c to +85 c storage temperature ? 40 c to +85 c load capacitance 18 pf shunt capacitance 7 pf maximum esr 25
ASM3P2759A http://onsemi.com 6 package dimensions tsot ? 23, 6 lead case 419af ? 01 issue o e1 e a2 a1 e b d c a top view side view end view l1 l l2 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-193. symbol min nom max a a1 a2 b c d e e1 e l 0o 8o l1 l2 0.01 0.80 0.30 0.12 0.30 0.05 0.87 0.15 2.90 bsc 2.80 bsc 1.60 bsc 0.95 typ 0.40 0.60 ref 0.25 bsc 1.00 0.10 0.90 0.45 0.20 0.50
ASM3P2759A http://onsemi.com 7 package dimensions soic 8, 150 mils case 751bd ? 01 issue o e1 e a a1 h l c e b d pin # 1 identification top view side view end view notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec ms-012. symbol min nom max a a1 b c d e e1 e h 0o 8o 0.10 0.33 0.19 0.25 4.80 5.80 3.80 1.27 bsc 1.75 0.25 0.51 0.25 0.50 5.00 6.20 4.00 l 0.40 1.27 1.35
ASM3P2759A http://onsemi.com 8 package dimensions tssop8, 4.4x3 case 948al ? 01 issue o e1 e a2 a1 e b d c a top view side view end view 1 l1 l notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-153. symbol min nom max a a1 a2 b c d e e1 e l1 0o 8o l 0.05 0.80 0.19 0.09 0.50 2.90 6.30 4.30 0.65 bsc 1.00 ref 1.20 0.15 1.05 0.30 0.20 0.75 3.10 6.50 4.50 0.90 0.60 3.00 6.40 4.40
ASM3P2759A http://onsemi.com 9 table 10. ordering information part number marking package type temperature ASM3P2759Af ? 06or o4ll 6 ? pin tsot ? 23, tape & reel, pb free commercial ASM3P2759Af ? 08tt 3p2759af 8 ? pin tssop, tube, pb free commercial ASM3P2759Af ? 08tr 3p2759af 8 ? pin tssop, tape & reel, pb free commercial ASM3P2759Af ? 08st 3p2759af 8 ? pin soic, tube, pb free commercial ASM3P2759Af ? 08sr 3p2759af 8 ? pin soic, tape & reel, pb free commercial ASM3P2759Ag ? 06or o3ll 6 ? pin tsot ? 23, tape & reel, green commercial ASM3P2759Ag ? 08tt 3p2759ag 8 ? pin tssop, tube, green commercial ASM3P2759Ag ? 08tr 3p2759ag 8 ? pin tssop, tape & reel, green commercial ASM3P2759Ag ? 08st 3p2759ag 8 ? pin soic, tube, green commercial ASM3P2759Ag ? 08sr 3p2759ag 8 ? pin soic, tape & reel, green commercial asm3i2759af ? 06or o5ll 6 ? pin tsot ? 23, tape & reel, pb free industrial asm3i2759af ? 08tt 3i2759af 8 ? pin tssop, tube, pb free industrial asm3i2759af ? 08tr 3i2759af 8 ? pin tssop, tape & reel, pb free industrial asm3i2759af ? 08st 3i2759af 8 ? pin soic, tube, pb free industrial asm3i2759af ? 08sr 3i2759af 8 ? pin soic, tape & reel, pb free industrial asm3i2759ag ? 06or o6ll 6 ? pin tsot ? 23, tape & reel, green industrial asm3i2759ag ? 08tt 3i2759ag 8 ? pin tssop, tube, green industrial asm3i2759ag ? 08tr 3i2759ag 8 ? pin tssop, tape & reel, green industrial asm3i2759ag ? 08st 3i2759ag 8 ? pin soic, tube, green industrial asm3i2759ag ? 08sr 3i2759ag 8 ? pin soic, tape & reel, green industrial on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y 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 wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. ASM3P2759A/d publication ordering information 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 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 on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
|
