cx-1-sm 8mhz to 160mhz miniature at-cut smd crystal cx-1-sm 8mhz to 160mhz miniature at-cut smd crystal general description the miniature cx-1-sm crystals in leadless ceramic packages have been designed for surface-mounting on printed circuit boards or hybrid circuits. it is a robust crystal that has gained widespread acceptance in the industry. outline a b c d e d e (to p) ! ! ! ! ! ! surface-mount - infrared, vapour phase, wave solder or epoxy mount techniques low profile, hermetically sealed package available with glass or ceramic lid high shock and vibration resistance custom designs available full military environmental testing available specification dimension a 8.00 8.38 b 3.56 3.94 c - see below d 1.14 1.40 e 1.52 1.78 cx-1-sm package dimensions typical (mm) maximum (mm) dimension ?c? sm1 1.65 1.78 sm2 1.70 1.83 sm3 1.78 1.90 glass lid (mm max.) ceramic lid (mm max.) 1 lr c c 0 1 1 12 r 1 l 1 1 cc 0 mot ional resistance motional capacitance mot ional induct ance shunt capacitance equivalent circuit frequency range: calibration tolerance*: load capacitance: motional resistance (r ): motional capacitance (c ): quality factor (q): shunt capacitance (c ): drive level: temperature stability**: ageing, first year: shock, survival***: vibration, survival: operating temperature: storage temperature: process temperature: 8mhz to 160mhz a 0.01% (100ppm) b 0.1% c 1.0% 20pf (unless other required) see table see table see table see table 500 w max. -10 to +70c from 10ppm -40 to +85c from 20ppm -55 to +125c from 30ppm 5ppm max. 3000g 0.3ms, ? sine 20g rms 10-2,000hz random -10~+70c (commercial) -40~+85c (industrial) -55~+125c (military) -55c~+125c 260c for 20 seconds specifications are typical at 25c unless otherwise indicated. the characteristics of the frequency stability parameter follow that of at-cut, thickness-shear mode crystals. * closer calibration available, as low as 5ppm ** does not include calibration tolerance ** a higher shock version is available, refer to data sheet for the model cx-1hg 1 1 0 m frequency 10.0mhz 50 5.5 80 2.2 32mhz 20 7.8 36 2.6 155mhz 50 0.5 41 3.2 cx-1 motional parameters, q and c 0 motional resistance r( ) 1 w motional capacitance c (ff) 1 quality factor ?000s shunt capacitance c (pf) 0 +44(0)1460 230000 +44(0)1460 230001 sales@euroquartz.co.uk www.euroquartz.co.uk telephone: fax: email: web: euro quartz cx miniature crystals page 1of2
typical hcmos pierce oscillator a conventional hcmos pierce oscillator is shown below. the crystal oscillates at a frequency f above the crystal?s series- resonant frequency. the crystal is effectively inductive and in combination with r , c and c in the feedback loop, provides approximately 180 of the phase shift necessary to ensure oscillation. o f1 2 order code cx-1 ?s? if special or custom design blank if standard frequency sm1 sm2 sm3 calibration tolerance* @ 25c a, b, c 32mhz sm1 circuit design conventional hcmos pierce oscillator circuit cx- 1 buffer amplifier osc . freq. (fo) c 1 c 2 c s r f r a cx-1-sm - bulk pack (standard) - 16mm tape, 178mm or 330mm reels (optional) per eia 481 - tray pack (optional) packaging temperature range: c = commercial i = industrial m = military s = specify ( a / 25ppm / 50ppm / i ) o.t.=3rd o.t. mode blank = fundamental c = ceramic lid blank = glass lid frequency stability over temperature range total frequency tolerance *for other calibration tolerances enter figure in ppm terminations designation sm1 gold plated sm2 nickel, silver plated sm3 nickel, solder plated and solder dipped termination 1.78 4.06 6.86 suggested solder pad layout cx-1-sm 8mhz to 160mhz miniature at-cut smd crystal cx-1-sm 8mhz to 160mhz miniature at-cut smd crystal +44(0)1460 230000 +44(0)1460 230001 sales@euroquartz.co.uk www.euroquartz.co.uk telephone: fax: email: web: euro quartz cx miniature crystals page 2of2
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