cx4 ext quartz crystal specification issue 1; january 2016 outline (mm) -sm1 = gold plated (lead free) glass lid conventional cmos pierce oscillator circuit description s tateks cx 4 quartz crystals are hermetically sealed in an ultra-miniature low profile surface mount ceramic package. this high quality quartz resonator forms the basis of a stable oscillator. -c sm1 gold plated (lead free) ceramic lid -c sm4 solder plated (lead free) ceramic lid -c sm5 solder dipped (lead free) ceramic lid -sm1 gold plated (lead free) glass lid -sm4 solder plated (lead free) glass lid -sm5 solder dipped (lead free) glass lid the cx4 family of surface mount crystals are ideal for small, high density, battery operated portable products. the cx4 crystal designed in a pierce oscillator (single inverter) circuit provides very low current consumption and high stability. a conventional cmos pierce oscillator circuit is shown below . the crystal is e ffectively inductive and in a pi network circuit with cd and cg provides the additional phase shift necessary to sustain oscillation. the oscillation frequency (f0) is 50 to 250 ppm above the crystal s series resonant frequency (fs). drive level: r a is used to limit the crystals drive level by forming a voltage divider between r a and cd . r a also stabilizes the oscillator against changes in the amplifiers output resistance (r0). r a should be increased for higher voltage operation. the cx4 crystal calibration tolerance is influenced by the e ffective circuit capacitances , specified as the load capacitance (cl). c l is approximately equal to : c l = ((cd x cg)/(cd + cg)) + cs note: cd and cg include stray layout to ground and cs is the stray shunt capacitance between the crystal terminal. in practice, the e ffective value of cl will be less than that calculated from cd, cg and cs values because of the e ffect of the amplifier output resistance . cs should be minimized. the oscillation frequency (f0) is approximately equal to: f0 = fs [1+ (c1 / (2(co + cl))] where fs = series resonant frequency of the crystal c1 = motional capacitance co = shunt capacitance please note that all data is only valid at 25c unless otherwise stated. frequency parameters frequency 600.0khz to 2.5mhz 500.00ppm to 10,000.00ppm frequency tolerance @ 25c tolerance condition 5ppm max in 1st year @ 25c ageing turning point to2: 35c temperature coefficient: -0.035ppm/c2 typ note: frequency f at temperature t is related to frequency fo at turning point temperature to by : ((f-fo)/fo)= k(t- to )2 printed on 25 apr 16 11 :37 using model data sheet v1.2550 page 1 of 3 sales office contact details: usa: +1.760.318.2824 france: 0800 901 383 uk: +44 (0)1460 270200 germany: 0800 1808 443 email: info@iqdfrequencyproducts.com web : www.iqdfrequencyproducts.com
cx4 ext quartz crystal specification electrical parameters 7.0pf load capacitance (cl) 1pf typ shunt capacitance (c0) 3w max drive level parameters fundamental overtone frequency,(hz) 600k 1.0m 1.4m 1.8432m 2.4576m motional resistance, r1 () 300 400 600 500 1000 motional resistance, r1 max 3k motional capacitance, c1 (ff) 3.5 2.0 1.3 3.5 1.5 quality factor, q (k) 250 200 150 80 45 shunt capacitance, co (pf) 1.0 0.8 0.7 1.0 0.8 operating temperature ranges -10 to 70c -40 to 85c -55 to 125c environmental parameters shock: 1500g, 0.3ms, 1/2 sine vibration: 20g rms, 10-2000hz random storage temperature range: -55 to 125c manufacturing details process temperature: 260c for 20sec max ordering information example: 1.0mhz cx4 ex t -sm1 500ppm -40 to 85c 7 fund minimum required* frequency* model* termination * frequency tolerance * operating temperature range * load capacitance compliance optional rohs status ( 20 11 /65/eu) compliant reach status ms l rating (jdec-std-033): not applicable packaging details tape & reel in accordance with eia-481-d pack style: reel pack size: 1,000 supplied on a tray pack style: tray pack size: 1 printed on 25 apr 16 11 :37 using model data sheet v1.2550 page 2 of 3 sales office contact details: usa: +1.760.318.2824 france: 0800 901 383 uk: +44 (0)1460 270200 germany: 0800 1808 443 email: info@iqdfrequencyproducts.com web : www.iqdfrequencyproducts.com
cx4 ext quartz crystal specification electrical specification - maximum limiting values frequency min frequency max temperature range stability (min) over tone order esr c ppm ? 600.0khz 1.4mhz -10 to 70 fundamental 600 -40 to 85 -55 to 125 1.8432mhz 2.5mhz -10 to 70 3ot 1,000 -40 to 85 -55 to 125 *stability maximum values 0ppm this document was correct at the time of printing; please contact your local sales office for the latest version. click to view latest version on our website. printed on 25 apr 16 11 :37 using model data sheet v1.2550 page 3 of 3 sales office contact details: usa: +1.760.318.2824 france: 0800 901 383 uk: +44 (0)1460 270200 germany: 0800 1808 443 email: info@iqdfrequencyproducts.com web : www.iqdfrequencyproducts.com
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