ASM3P2182a lcd panel emi reduction ic ?2010 scillc. all rights reserved. publi c ation order number: october 2010 C rev. 2.1 a sm3p2182/d fe at ures fcc approved method of emi attenuation. pro v ides up to 15db emi reduction. generates a 1x low emi spread spectrum clock of the input frequency. input frequency range: 25mhz to 210mhz. internal loop filter minimizes external components and board space. center spread. 4 spread frequency deviation selections: 0.13% to 1.24%. low inherent cycle-to-cycle jitter. 3.3v operating voltage. ttl or cmos compatible inputs and outputs. low power cmos design. supports notebook vga and other lcd timing controller applications. available in 8-pin soic package. produ c t description the ASM3P2182a is a versatile spread spectrum frequ e ncy modulator designed specifically for a wide range of input clock frequencies from 25mhz to 210mhz. ( refer to input frequency and modulation rate table) . the ASM3P2182a can generate an emi reduced clock from an osc or a system generated clock. the ASM3P2182a offers a center spread clock and with a percentage deviation from 0.13% or 1.24%. the ASM3P2182a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of down stream clock and data dependent signals. the ASM3P2182a 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 ASM3P2182a uses the most efficient and optimized modulation profile approved by the fcc and is implemented in a proprietary all digital method. the ASM3P2182a 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 signals bandwidth is called spread spectrum clock generation. applications the ASM3P2182a is targeted towards emi management for me mory and lvds interfaces in mobile graphic chipsets and high-speed digital applications such as pc peripheral devices, consumer electronics, and embedded controller systems. vss clkin crystal oscillato r frequency divider feedback divider modulation phase detector loop filter vco output d ivider modout pll v dd s0 fs0 fs1
ASM3P2182a rev. 2 | page 2 of 6 | www.onsemi.com pin configuration pin description pin# pin name type description 1 clkin i connect to externally generated clock signal. 2 gnd p ground to entire chip. 3 s1 i spread range select. digital logic input used to select frequency deviation (refer to spread deviation table ). this pin has an internal pull-up resistor. 4 s0 i spread range select. digital logic input used to select frequency deviation (refer to spread deviation table ). this pin has an internal pull-up resistor. 5 modout o spread spectrum low emi output. 6 vdd p power supply for the entire chip (3.3v). 7 fs0 i frequency range select. digital logic input used to select frequency range (refer to input frequency and modulation rate table ). this pin has an internal pull-up resistor. 8 fs1 i frequency range select. digital logic input used to select frequency range (refer to input frequency and modulation rate table ). this pin has an internal pull-up resistor. input frequency and modulation rate table fs1 (pin 8) fs0 (pin 7) frequency range 0 0 25mhz to 50mhz 0 1 50mhz to 103mhz 1 0 75mhz to 150mhz 1 1 160mhz to 210mhz 1 2 3 4 5 6 7 8 ASM3P2182a clkin gnd s1 s0 modout vdd fs0 fs1
ASM3P2182a rev. 2 | page 3 of 6 | www.onsemi.com spread deviation selection table s1 s0 spreading range ( %) 25 mhz 40 mhz 65 mhz 81 1 mhz 81 2 mhz 108 mhz 120 mhz 162 mhz 200 mhz 0 0 0.28 0.19 0.15 0.12 0.18 0.15 0.1 0.1 0.06 0 1 0.8 0.3 0.3 0.2 0.5 0.3 0.19 0.3 0.1 1 0 1.2 0.54 0.45 0.4 0.8 0.6 0.36 1.0 0.6 1 1 2.1 1.0 1.1 0.9 1.4 1.1 0.75 1.9 1.2 notes: 1. frequency range- 50mhz to 103mhz 2. frequency range- 75mhz to 150mhz absolute maximum ratings symbol parameter rating unit vdd supply voltage pin with respect to ground -0.5 to +4.6 v v in input voltage pin with respect to ground vss-0.5 to vdd+0.5 v v out output voltage pin with respect to ground vss-0.5 to vdd+0.5 v t stg storage temperature -55 to +125 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 prolonged periods of time may affect device reliability. rec ommended operating conditions parameter description min typ max unit vdd operating voltage 2.7 3.3 3.7 v t a operating temperature (ambient temperature) -40 +85 c c l load capacitance 15 pf c in input capacitance 5 pf
ASM3P2182a rev. 2 | page 4 of 6 | www.onsemi.com dc electrical characteristics symbol parameter min typ max unit v il input low voltage gnd C 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 = 3.3v, i ol = 20ma) 0.4 v v oh output high voltage (v dd = 3.3v, i oh = 20ma) 2.5 v i cc dynamic supply current normal mode (3.3v and 10pf loading) 8.46 12 17.78 ma i dd static supply current standby mode 1 0.6 ma v dd operating voltage 2.7 3.3 3.7 v t on power up time (first locked clock cycle after power up) 0.18 ms z out clock out impedance 50 note: 1. clkin pin is pulled low. ac electrical characteristics symbol parameter min typ max unit clkin input frequency 25 210 mhz modout output frequency 25 210 mhz t lh 1 output rise time (measured at 0.8v to 2.0v) 1.2 1.32 1.4 ns t hl 1 output fall time (measured at 2.0v to 0.8v) 0.8 0.9 1.0 ns t jc jitter (cycle to cycle) 360 ps t d output duty cycle 45 50 55 % note: 1. t lh and t hl are measured into a capacitive load of 15pf.
ASM3P2182a rev. 2 | page 5 of 6 | www.onsemi.com package information 8-le ad (150-mil) soic package d e h d a1 a2 a q l c b e 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 0.010 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
ASM3P2182a on s emiconductor 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 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 specifically disclaims any and all liability, including without 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 applications 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 situation 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 officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly 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. u.s patent pending; timing-safe and active bead are trademarks of pulsecore semiconductor, a wholly owned subsidiary of on semiconductor. this literature is subject to all applicable copyright laws and is not for resale in any manner. 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 ordering information part number marking package temperature ASM3P2182af-08st acv 8-pin soic, tube, pb free 0c to +70c ASM3P2182af-08sr acv 8-pin soic, tape & reel, pb free 0c to +70c a microdot placed at the end of last row of marking or just below the last row toward the center of package indicates pb-free.
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