MHz~MHz. 30Max. Fundamental/AT. MHz~MHz. 60Max. Third. Overtone /AT. Mechanical characteristics. Resistance to shock. that may be provided in Freescale Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary. series and range associated to this part. 49USMX Series. Technical Datasheet: MHZ 49USMX/30/50/40/18PF/ATF Datasheet. See all Technical Docs.
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Strip resonators, usually AT cuts, are smaller and therefore less sensitive to mechanical shocks. Mathematically using the Laplace transformthe impedance of this network can be written as:.
It is inversely dependent on the frequency, and on the constant that is dependent on the particular cut. In datashee projects Wikimedia Commons.
MHz-KDS – Keysemi
The etch channel density for swept quartz is about 10— and significantly more for unswept quartz. Listed here are typical specifications for KDS oscillators. Requires an oven, does not operate well at ambient 61.000 as the frequency rapidly falls off at lower temperatures.
Aging decreases logarithmically with time, the largest changes occurring shortly after manufacture. Crystals designed for operating in overtone modes have to be specially processed for plane parallelism and surface finish for the best performance at a given overtone frequency.
The first crystal-controlled oscillatorusing a crystal of Rochelle saltwas built in and patented  in by Alexander M. This modulates the resonant frequency to a small degree by the frequency of the vibrations.
The reverse process however is datashert entirely homogeneous and crystal twinning occurs. Almost any object made of an elastic material could be used like a crystal, with appropriate transducerssince all objects have natural resonant frequencies of vibration.
In manufacture, right-handed quartz is generally used. The frequency stability is determined by the crystal’s Q. Figure 2 shows two points at which thethe oscillator circuit with the crystal as part of the Datadheet network. Pierce and Louis Essen.
Some of the defects produce localized levels in the forbidden band, serving as charge traps; Al III and B III typically serve as hole traps while electron vacancies, titanium, germanium, and phosphorus atoms serve as electron traps. The low frequency cuts are mounted at the nodes where they are virtually motionless; thin wires are attached at such points on each side between the crystal and the leads.
In a crystal oscillator, the crystal mostly vibrates in one axis, therefore only one phase is dominant. Adding inductance across a crystal causes the parallel resonant frequency to increase. Hydrogen ions are mobile down to 10 K, but alkali metal ions become mobile only at temperatures around and above K. Note that these points imply a subtlety concerning crystal oscillators in this frequency range: Failures may be, however, introduced by faults in bonding, leaky enclosures, corrosion, frequency shift by aging, breaking the crystal by too high mechanical shock, or radiation-induced damage when nonswept quartz is used.
Crystaloscillator is designed to work with an external piezoelectric Several resonator configurations are possible, in addition to the classical way of directly attaching leads to the crystal. Although crystal oscillators still most commonly use quartz crystals, devices using other materials are becoming more common, such as ceramic resonators.
KDS datasheet & applicatoin notes – Datasheet Archive
Though most spurious modes are typically some tens of kilohertz above the wanted series resonance their temperature coefficient is different from the main mode and the spurious response may move through the main mode at certain temperatures.
Crystals for AT-cut are the most common in mass production of oscillator materials; the shape and dimensions are optimized for high yield of the required wafers.
datashdet A double rotated cut “Linear Coefficient” with a linear temperature-frequency response; can be used as a sensor in crystal thermometers. Other influencing factors are the overtone used, the mounting and electrodes, impurities in the crystal, mechanical strain, crystal geometry, rate of temperature change, thermal history due to hysteresisionizing radiation, and drive level.
Sensitive to electric fields. No abstract text available Text: The frequency of the crystal is slightly adjustable “pullable” by modifying the attached capacitances. Harmonics are an exact integer multiple of the fundamental frequency. Many applications call for 16000 crystal oscillator frequency conveniently related to some other desired frequency, so hundreds of standard crystal frequencies are made in large quantities and stocked by electronics distributors.
Cavity oscillator Delay-line oscillator Opto-electronic oscillator Robinson oscillator Transmission-line oscillator Klystron oscillator Cavity magnetron Gunn oscillator. To reach higher frequencies, a crystal can be made to vibrate at one of its overtone modes, which occur near multiples of the fundamental datashee frequency.