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 em8gt tcxo description package 8 pin dil frequency range: 20.0 to 50.0khz; 32.768khz supply voltage 3.3 or 5.0 volts frequency stability from 1ppm over -30 to +75c rohs compliant em8gt series tcxos are packaged in a miniature 6 pad ceramic smd package. with squarewave (cmos) output, tolerances are available from 1.0ppm over -30 to +75c. the part has a 0.01 m f decoupling capacitor built in. em8gt - outlines and dimensions frequency stability frequency +3.3 v 32.768khz 8.0ma 50khz 12ma current consumption specification product series code tcxo: em8gt vctcxo: vem8gt frequency range: 32.768khz standard frequency 20.0khz to 50.0khz output waveform: squarewave initial calibration tolerance models with mech. trimmer: <1.0ppm (at t. 252c) models without trimmer: <2.0ppm (at t. 252c) operating temperature range: see table frequency stability vs. ageing: 1.0 ppm max. first year vs. voltage change: 0.3 ppm max. 5% change vs. load change: 0.3 ppm max. 10% change vs. reflow: 1ppm max. for one reflow (measured after 24 hours) supply voltage: +3.3 or +5.0volts ( specify when ordering) output logic levels: logic high: 90% vdd min. logic low: 10% vdd max. rise and fall times: 10ns max. duty cycle: 50%5% start-up time: 2ms typical, 5ms max. current consumption: see table below output load: 15pf storage temperature: -55~+125c part numbering procedure example: em8gt33-32.768k-2.5/-30+75 supply voltage 33 = 3.3 vdc 5 = 5.0 vdc frequency (khz) stability over otr (ppm) operating temperature range (otr) (c) lower and upper limits. series description tcxo = em8gt vctcxo = vem8gt control voltage: standard = +1.51.0volts for all input voltages. (contact technical sales if +2.52.0 volts is required.) frequency deviation: 6.0 ppm min. slope polarity: positive (increase of control voltage increases output frequency.) input impedance: 10k min. modulation bandwidth: 3.0khz min. measured at -3db linearity: 10% max. vem8gt voltage control specification cmos 8 pin dil, khz range frequency stability (ppm) 0.5 1.0 1.5 2.0 2.5 temperature range (c) 0 ~ +50 ask p p p p -10 ~ +60 x p p p p -20 ~ +70 x x p p p -30 ~ +75 x x x p p p -40 ~ +85 x x x x p p = available, x = not available, ask = call technical sales frequency stability 20.0khz to 50.0khz
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