euroquartz limited blacknell lane crewkerne somerset uk ta18 7he tel: +44 (0)1460 230000 fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk euro quartz 7 x 5 x 1.4mm smd - group 'n' 3EQHM572N low emi oscillator description eqhm572 series low emi oscillators can reduce system emi from 8db to 16db. the oscillators are a ?drop-in? replacement for standard oscillators. emi reduction is achieved by the use of spread spectrum technology whereby the mode energy is spread over a wider bandwidth. the modulation carrier frequency, operating in the khz region, makes the process transparent to the oscillator frequency. there is a choice of modulation rates and spread to suit application requirements. provides from 8db to 15db reduction in system emi ?drop-in? replacement for standard clocks choice of modulation rate and spread miniature package: 7.0 mm x 5.0 mm x 1.4mm n group parts provide a low cost emi reduction solution printers, multiple function printers (mpcs) digital copiers; pdas networking: lan/wan; routers storage systems (cd-rom, vcd, dvd, hdd) scanners; modems; projectors embedded systems musical instruments automotive: gps car navigation systems lcd pc monitors; lsd tvs adsl; pcmcia still digital cameras (sdcs) medical devices applications spread spectrum technology unlike a conventional clock oscillator, in a spread spectrum clock oscillator the mode energy is spread over a wider bandwidth. this is achieved by the frequency modulation technique. the controlled modulation process may be applied to the 'down' side of the nominal frequency (known as down spread ,) or spread equally either side of nominal ( centre spread ). down spread is preferred if over- clocking would cause a problem to the system. modulation types - examples page 1 of 3 in electrical systems the principal cause of electro- magnetic interference (emi) is the system clock oscillator. traditional methods of 'patching-up' systems with too high a level of emi is to use ferrite beads, filters, ground planes, metal shielding and similar costly methods, however, the most efficient and economic method to reduce emi is to reduce it at source: replace the system clock ocillator with a low emi clock oscillator. compared with conventional clock oscillators, spread spectrum (dithered) oscillators can reduce emi by as much as 16db. the part is a 'drop-in' replacement for a standard clock oscillator hence there is no requirement to re-design existing pcbs.
euroquartz limited blacknell lane crewkerne somerset uk ta18 7he tel: +44 (0)1460 230000 fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk euro quartz outline & dimensions page 2 of 3 model no: 3eqhm572 (group ?n?) frequency range: 8.0mhz to 128.0mhz spread types: down or centre spread spread magnitude: see table 1 below. ( ) emi reduction: 8~15db reduction typical. fundamental and higher order harmonics. variation of emi reduction across temerature: 5% max. across -40 to +85c w.r.t. room temperature modulation carrier frequency: 31.25khz min, 62.50khz max. frequency stability*** commercial (0~70c): 25ppm (spec. code = ?a?) 50ppm (spec. code = ?b?) 100ppm (spec. code = ?c?) industrial (-40~+85c): 25ppm (spec. code = ?d?) 50ppm (spec. code = ?e?) 100ppm (spec. code = ?f?) rise/fall times: 5ns max, (10% to 90% vdd) start-up time: 5ms typical, 10ms max. stabilisation (pll lock) time: 2ms maximum. ageing: 5ppm/year output logic: cmos square wave input voltage: +3.3volts dc10% output voltage high ?1?: 2.4v min., ioh = -4ma at spread spectrum output output voltage low ?0?: 0.4v max., ioh = 4ma at spread spectrum output load: 15pf maximum current consumption (no load) 12mhz: 28ma 24mhz: 33ma 32mhz: 41ma duty cycle: 50%10% (cl=15pf, 50%vdd) cycle to cycle jitter: see table 2 output impedance: 45 to 90 typical. dependent upon output frequency spread type and spread magnitude packaging: eia 16mm tape and reel, 1k per. pad 1 function: no connection specification 7 x 5 x 1.4mm smd - group 'n' 3EQHM572N low emi oscillator 8.0mhz to 128mhz 8.0mhz: 240ps typical, 450ps maximum 16.0mhz: 270ps typical, 400ps maximum 32.0mhz: 240ps typical, 380ps maximum 64.0mhz: 165ps typical, 380ps maximum 128.0mhz: 150ps typical, 380ps maximum cycle-to-cycle jitter table 2 ssc block diagram
euroquartz limited blacknell lane crewkerne somerset uk ta18 7he tel: +44 (0)1460 230000 fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk euro quartz 3eqhm572-b-32.768n-c1.4 page 3 of 3 part number format and example frequency stability code ?a? to ?f?. see specification above frequency (mhz) group ?n? spread type & modulation magnitude table 1 series designation environmental specification rohs compliance: rohs compliant and pb (lead) free in accordance with eu directive 2002/95/ec 6/6 (2002/95/ec) and weee (2002/96/ec) moisture sensitivity level: level 1 (infinite) according to ipc/jedec j-std-020d.1 second level interconnect: e4 humidity: 85% rh, 85c for 48 hours fine leak / gross leak: mil-std-883, method 1014, condition a / mil-std-883, method 1014, condition c solderability: mil-std-2002f method 208e reflow: 260 for 10 seconds 2 times vibration: mil-std-202f method 204, 35g 50 to 2000hz shock: mil-std-202f method 213b, test condition: e, 1000g ? sine wave resistance to solvents: mil_std-202, method 215 temperature cycling: mil-std-883, method 1010 esd rating: 2kv minimum per jedec std 22-a114-b pad surface finish: gold (au) (0.3m minimum) over nickel (n) (1.27m to 8.89m) device mass (weight): 0.14mg per unit typical 7 x 5 x 1.4mm smd - group 'n' 3EQHM572N low emi oscillator 8.0mhz to 128mhz frequency range (mhz) modulation carrier frequency (khz) spread type and modulation magnitude (%) (spread spectrum part code) fo centre spread ('c') down spread ('d') 8.0 ~ 9.99 fo/256 1.4% (c1.4) 0.6% (c0.6) '-3.0% (d3) -2.2% (d2.2) 10.0 ~ 11.99 1.3% (c1.3) 0.5% (c0.5) -2.7% (d2.7) -1.9% (d1.9) 12.0 ~ 13.99 1.2% (c1.2) 0.5% (c0.5) -2.5% (d2.5) -1.8% (d1.8) 14.0 ~ 15.99 1.1% (c1.1) 0.4% (c0.4) -2.3% (d2.3) -1.7% (d1.7) 16.0 ~ 19.99 fo/512 1.4% (c1.4) 0.6% (c0.6) '-3.0% (d3) -2.2% (d2.2) 20.0 ~ 23.99 1.3% (c1.3) 0.5% (c0.5) -2.7% (d2.7) -1.9% (d1.9) 24.0 ~ 27.99 1.2% (c1.2) 0.5% (c0.5) -2.5% ( d2.5) -1.8% (d1.8) 28.0 ~ 31.99 1.1% (c1.1) 0.4% (c0.4) -2.3% (d2.3) -1.7% (d1.7) 32.0 ~ 39.99 fo/256 1.4% (c1.4) 0.6% (c0.6) '-3.0% (d3) -2.2% (d2.2) 40.0 ~ 47.99 1.3% (c1.3) 0.5% (c0.5) -2.7% (d2.7) -1.9% (d1.9) 48.0 ~ 55.99 1.2% (c1.2) 0.5% (c0.5) -2.5% ( d2.5) -1.8% (d1.8) 56.0 ~ 63.99 1.1% (c1.1) 0.4% (c0.4) -2.3% (d2.3) -1.7% (d1.7) 64.0 ~ 79.99 fo/512 1.4% (c1.4) 0.6% (c0.6) '-3.0% (d3) -2.2% (d2.2) 80.0 ~ 95.99 1.3% (c1.3) 0.5% (c0.5) -2.7% (d2.7) -1.9% (d1.9) 96.0 ~111.99 1.2% (c1.2) 0.5% (c0.5) -2.5% ( d2.5) -1.8% (d1.8) 112.0 ~ 128.0 1.1% (c1.1) 0.4% (c0.4) -2.3% (d2.3) -1.7% (d1.7) spread type and modulation magnitude. use the spread spectrum characteristic part code shown in table 1 above.
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