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 model no: 18EQHM572 frequency range: 12.5mhz to 42.0mhz emi reduction and spread types: modulation carrier frequency: output logic: cmos input voltage: vdd = +1.8 0.15vdc 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?) output voltage high ?1?: 1.6v min., 1.85v max. output voltage low ?0?: 0.0v max., 0.2v max. rise/fall times: 2.5ns max. load: 15pf start-up time: 2ms typical, 5ms max. stabilization time: 40ms max. output impedance: 30 w typical output slew rate: 0.4 v/ns min.; 3.0v/ns max. current consumption: 13mhz: 2.0ma typical 16mhz: 2.8ma typical 25mhz: 3.5ma typical 42mhz: 5.0ma typical duty cycle: 50%10% (cl=15pf, 50%vdd) cyle to cycle jitter: 100ps max. ageing: 5ppm /year max at ta=25c pad 1 option: output enable/disable. output is high impedance when taken low output enable time 100ms max. packaging: eia 16mm tape and reel, 1k per. specification page 1 of 2 environmental specification rohs compliance: rohs compliant and pb (lead) free moisture sensitivity level: level 1 (infinite) second level interconnect: e4 storage temperature range: -55 to +125c humidity: 85% rh, 85c for 48 hours fine leak / gross leak: mil-std-883, meth. 1014, cond. a mil-std-883, meth. 1014, cond. c hermetic seal: leak rate 2x10 -8 atm-cm 3 /s max. solderability: mil-std-2002f method 208e reflow: 260 for 10 seconds x2 vibration: mil-std-202f method 204, 35g, 50hz 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: >2000v (per mil-std-883, method 3015) pad surface finish: gold (0.3um min.) over nickel (1.27um to 8.89um) weight of the device: 0.17 grams. 7 x 5 x 1.4mm smd - group 'f' (1.8 volts) 18EQHM572 low emi oscillator provides up to -12db reduction in system emi ?drop-in? replacement for standard clocks no need to re-design printed circuit boards operates with 1.8 volts supply voltage choice of modulation rate and spread miniature package: 7.0 mm x 5.0 mm x 1.4mm features total % down spread (d) centre spread (c) emi reduction rate 0.5% -0.5% (d0.5) 0.25% (c0.25) -12db (typ.) 1% -1% (d1) 0.5% (c0.5) -16db (typ.) 2% -2% (d2) 1% (c1.0) -18db (typ.) spread type & percentage and emi reduction rates absolute maximum ratings power supply voltage -0.5v min., +2.5v max. input voltage vss-0.5v min., v dd +0.5v max. output voltage vss-0.5v min., v dd +0.5v max. operation junction temp. -40 c min., +125 c max. output current -13ma min., +13ma max.
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 page 2 of 2 18eqhm57-bt-20.000f-c0.5 part number configuration spread type & percentage "d0.5" down spread -0.5% "d1" -1% "d2" -2% "c0.25" centre spread 0.25% "c0.5" 0.5% "c1.0 0.1% ?t? for tristate frequency stability code ?a? to ?f?. see specification frequency (mhz) group ?f? characteristics series designation 7 x 5 x 1.4mm smd - group 'f' (1.8 volts) 18EQHM572 low emi oscillator modulation types - examples description 18EQHM572 series low emi oscillators can reduce system emi by -15db. 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. 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. 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 -15db. the part is a 'drop-in' replacement for standard clock oscillators hence there is no requirement to re-design existing pcbs. introduction
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