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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The output frequency of a quartz oscillator can be either that of the fundamental resonance or of a multiple of that resonance, called a harmonic frequency. An oscillator crystal has two electrically conductive plates, with a slice or tuning fork of quartz crystal sandwiched between them. These effects can be used to adjust the frequency at which a crystal oscillates. Patent 3,Issue date: Crystals are sensitive to shock.

Figure 2 shows two points at which the crystal appears purely resistivePi-type feed back network. A VCXO is a specific kd of oscillator that requires a specially designed crystal.

A varactora diode with capacitance depending on applied voltage, is often used in voltage-controlled crystal oscillators, VCXO. Allan variance the most common one specified in oscillator data sheetsphase noise, spectral density of phase deviations, and spectral density of fractional frequency deviations. Sweeping can also be used to introduce one kind of an impurity into the crystal.

Crystal oscillator

Less sensitive to drive levels. Its datashret overtone is about six times the fundamental frequency. Although crystal oscillators still most commonly use quartz crystals, devices using other materials are becoming more common, such as ceramic resonators. One of the most important traits of quartz crystal oscillators is that they can exhibit very low phase noise.

KDS Datasheet, PDF – Alldatasheet

Mechanical vibration isolation mountings can be used for high-stability crystals. The mounting and contacts may undergo relief of the built-in stresses. Crystals suffer from minor short-term frequency fluctuations as well.


A number of firms started producing quartz crystals for electronic use during this time. The frequency-temperature curve is a datashset parabola.

Temperature-sensitive, can be used as a sensor. A DC voltage datasheeh between the electrodes can accelerate the initial aging, probably by induced diffusion of impurities through the crystal. Generating and transmitting electric currents U. Piezoelectricity was discovered by Jacques and Pierre Curie in Quartz exists in several phases. Ddatasheet frequency multiplication by 10 times multiplies the magnitude of the phase error by 10 times.

Sinha Stress-compensated quartz resonators U. Has reasonably low temperature coefficient, widely used for low-frequency crystal filters. The most common type of piezoelectric datashee used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators, [1] but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.

To accomplish this, the oscillator circuit usually includes additional LC circuits to select the desired overtone.

Sodium and iron ions can cause inclusions of acnite and elemeusite crystals. Very low radiation doses below rad have disproportionately higher effect, but this nonlinearity saturates at higher doses. SC-cut crystals are most advantageous where temperature control at their temperature of zero temperature coefficient turnover is possible, under these circumstances an overall stability performance from premium units can approach the stability of Rubidium frequency standards.

Patent 5,Issue date: Other factors influencing the frequency are the power supply voltage, load impedance, magnetic fields, electric fields in case of cuts that are sensitive to them, e. J cut is made of two quartz plates bonded together, selected to produce out of phase motion for a given electrical field.


MHz-KDS – Keysemi

Both left and right-handed crystals can be used for catasheet, if the cut angle is correct. Less sensitive to mechanical stresses. Piezoelectric resonators are sold as separate components for use in crystal oscillator circuits.

16.000 a crystal oscillator, the crystal mostly vibrates in one axis, therefore only one phase is dominant. External atmosphere composition can also influence the aging; hydrogen can diffuse through nickel housing. Voltage Controlled Silicon Oscillator; Package: Single mode with steep frequency-temperature characteristics. The large mass of the crystal suspended on the thin wires makes the assembly sensitive to mechanical shocks and vibrations.

An example is shown in the picture.

Less available than AT cut, more difficult to manufacture; the order-of-magnitude improvement lds parameters is traded for an order of magnitude tighter crystal orientation tolerances. The mechanical stress causes a short-term change in the oscillator frequency due to the stress-sensitivity of the crystal, and kd introduce a permanent change of frequency due to shock-induced changes of mounting and internal stresses if the elastic limits of the mechanical parts are exceededdesorption of contamination from the crystal surfaces, or change in parameters of the oscillator circuit.

The typicaloscillator to a fixed frequency operation. The gap between the electrodes and the resonator act as two small series capacitors, making the crystal less sensitive to circuit influences. No abstract text available Text: There are datasjeet with SC-cut shear mode crystals, such as the need for the maintaining oscillator to discriminate against other closely related unwanted modes and increased frequency change due to temperature when subject to a full ambient range.