? semiconductor components industries, llc, 2011 august, 2011 ? rev. p2 1 publication order number: asm3p1819n/d asm3p1819n product preview low power mobile vga emi reduction ic description the asm3p1819n is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 20 to 40 mhz. the asm3p1819n can generate an emi reduced clock from crystal, ceramic resonator, or system clock. the asm3p1819n reduces electromagnetic interference (emi) at the clock source, allowing a system wide emi reduction for all the down stream clocks and data dependent signals. the asm3p1819n allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass emi regulations. the asm3p1819n modulates the output of a single pll in order to ?spread? the bandwidth of a synthesized clock, thereby decreasing the peak amplitude of its harmonics. this results in a significantly lower system emi compared to the typical narrow band signal produced by oscillators and most clock generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation?. the asm3p1819n uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all digital method. applications the asm3p1819n is targeted towards emi management for memory and lvds interfaces in mobile graphic chipsets and high ? speed digital applications such as pc peripheral devices, consumer electronics and embedded controller system. features ? fcc approved method of emi attenuation ? provides up to 15 db emi reduction ? generates a low emi spread spectrum clock and a non ? spread reference clock of the input frequency ? optimized for frequency range from 20 mhz to 40 mhz ? internal loop filter minimizes external components and board space ? down spread deviation: ? 1.25% ? low inherent cycle ? to ? cycle jitter ? 3.3 v operating voltage ? cmos/ttl compatible inputs and outputs ? low power cmos design ? supports notebook vga and other lcd timing controller applications ? power down function for mobile application ? products are available for industrial temperature range ? available in 8 pin soic and tssop packages ? these are pb ? free devices this document contains information on a product under development. on semiconductor reserves the right to change or discontinue this product without notice. http://onsemi.com soic ? 8 s suffix case 751bd pin configuration (top view) see detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. ordering information xout vdd pd# ref vss nc xin 1 modout tssop ? 8 t suffix case 948al
asm3p1819n http://onsemi.com 2 figure 1. block diagram vss vco ref xout xin pd# phase detector loop filter vdd pll output divider modout modulation frequency divider feedback divider crystal oscillator table 1. pin description pin# pin name type description 1 xin i connect to externally generated clock signal or crystal. 2 vss p ground connection. connect to system ground. 3 nc ? no connect. 4 modout o spread spectrum clock output. 5 ref o non ? modulated reference clock output of the input frequency. 6 pd# i power down control pin. pull low to enable power ? down mode. this pin has an intern- al pull ? up resistor. 7 vdd p connect to +3.3 v. 8 xout i connect to crystal. no connect if externally generated clock signal is used. table 2. 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 3. output frequency and modulation rate input frequency range (mhz) output frequency range (mhz) modulation rate spread deviation (%) 20 to 40 20 to 40 input frequency / 512 ? 1.25
asm3p1819n http://onsemi.com 3 table 4. dc electrical characteristics (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 ? 20.0 a i ih input high current 1.0 a i xol x out output low current @ 0.4 v, vdd = 3.3 v 3 ma i xoh x out output high current @ 2.5 v, vdd = 3.3 v 3 ma v ol output low voltage vdd = 3.3 v, i ol = 20 ma 0.4 v v oh output high voltage vdd = 3.3 v, i oh = 20 ma 2.5 v i cc dynamic supply current 3.3 v and 10 pf probe loading 7.1 f in ? min 26.9 f in ? max ma i dd static supply current 4.5 ma vdd operating voltage 3.3 v t on power up time (first locked clock cycle after power up) 0.18 ms z out clock output impedance 50 table 5. ac electrical characteristics symbol parameter min typ max unit f in input frequency 20 40 mhz f out output frequency 20 40 mhz t lh (note 1) output rise time (measured from 0.8 v to 2.0 v) 0.69 ns t hl (note 1) output fall time (measured from 2.0 v to 0.8 v) 0.66 ns t jc jitter (cycle to cycle) ? 200 200 ps t d output duty cycle 45 50 55 % 1. t lh and t hl are measured into a capacitive load of 15 pf.
asm3p1819n http://onsemi.com 4 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
asm3p1819n http://onsemi.com 5 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
asm3p1819n http://onsemi.com 6 table 6. ordering information part number marking package type temperature asm3p1819nf ? 08 ? st 3p1819nf 8 ? pin soic, tube, pb free commercial asm3p1819nf ? 08 ? sr 3p1819nf 8 ? pin soic, tape and reel, pb free commercial asm3p1819ng ? 08 ? st 3p1819ng 8 ? pin soic, tube, green commercial asm3p1819ng ? 08 ? sr 3p1819ng 8 ? pin soic, tape and reel, green commercial asm3i1819nf ? 08 ? st 3i1819nf 8 ? pin soic, tube, pb free industrial asm3i1819nf ? 08 ? sr 3i1819nf 8 ? pin soic, tape and reel, pb free industrial asm3i1819ng ? 08 ? st 3i1819ng 8 ? pin soic, tube, green industrial asm3i1819ng ? 08 ? sr 3i1819ng 8 ? pin soic, tape and reel, green industrial asm3p1819nf ? 08 ? tt 3p1819nf 8 ? pin tssop, tube, pb free commercial asm3p1819nf ? 08 ? tr 3p1819nf 8 ? pin tssop, tape and reel, pb free commercial asm3p1819ng ? 08 ? tt 3p1819ng 8 ? pin tssop, tube, green commercial asm3p1819ng ? 08 ? tr 3p1819ng 8 ? pin tssop, tape and reel, green commercial asm3i1819nf ? 08 ? tt 3i1819nf 8 ? pin tssop, tube, pb free industrial asm3i1819nf ? 08 ? tr 3i1819nf 8 ? pin tssop, tape and reel, pb free industrial asm3i1819ng ? 08 ? tt 3i1819ng 8 ? pin tssop, tube, green industrial asm3i1819ng ? 08 ? tr 3i1819ng 8 ? pin tssop, tape and 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. asm3p1819n/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
|
