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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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. Voltage Controlled Silicon Oscillator; Package: Crystals are also used in other types of electronic circuits, such as crystal filters. A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric resonator, a crystal, as its frequency-determining element.
This page was last edited on 25 Decemberat datasheft Quartz crystal oscillators were developed for high-stability frequency references during the s and s.
An oscillator crystal has two electrically conductive plates, with a dxtasheet or tuning fork of quartz crystal sandwiched between them.
Techniques minimize the phase noise in crystal oscillator circuits. Webarchive template wayback links Webarchive template archiveis links All articles with unsourced statements Articles with unsourced statements from August All Wikipedia articles needing clarification Wikipedia articles needing clarification from August Articles with unsourced statements from November Articles that may be too long from July Articles using small message boxes Commons category link is on Wikidata Commons category link 16.00 on Wikidata using P Receive Crystal Reference Oscillator.
Has poorer temperature characteristics than the AT cut.
Inclusions of water may be present in fast-grown crystals; interstitial water molecules are abundant near datashheet crystal seed.
To produce higher frequencies, manufacturers make overtone crystals tuned to put the 3rd, 5th, or 7th overtone at the desired frequency, because they are thicker and therefore easier to manufacture than a fundamental crystal that would produce the same frequency—although exciting the desired overtone frequency requires a slightly more complicated oscillator circuit.
There are disadvantages 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.
Sensitive to electric fields.
Patent 3,Issue date: Single mode with steep frequency-temperature characteristics. 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. Factors outside of the crystal itself are e. Raising frequency by scratching off parts of the electrodes is not advised as this may damage the crystal and lower its Q factor. The growth direction and rate also influences the rate of uptake of impurities.
Neutron radiation induces frequency changes by introducing dislocations into the lattice by knocking out atoms, a single fast neutron can produce many defects; the SC and AT cut frequency increases dagasheet linearly with absorbed neutron dose, while the frequency of the BT cuts decreases.
In manufacture, right-handed quartz is generally used. 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.
Due to aging and environmental factors such as temperature and vibrationit is difficult to keep even the best quartz oscillators within one part in 10 10 of their nominal frequency without constant adjustment.
The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal dataaheet,  but other piezoelectric materials including polycrystalline ceramics are used in similar circuits.
KDS MHz crystal oscillator datasheet & applicatoin notes – Datasheet Archive
Vig High sensitivity temperature sensor and sensor array U. When a crystal of quartz is properly cut and mounted, it can be made to distort in an electric field by applying a voltage to an electrode near or on the crystal. Such a crystal is referred to as a 3rd, 5th, or even 7th overtone crystal. Previous 1 2 It was often used in mechanical filters before quartz.
Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. Other common impurities of concern are e. Wikimedia Commons has media related to Crystal oscillators.
For applications not needing very precise timing, a low-cost ceramic kdss is often used in place of a quartz crystal. Gold also does not form oxides; it adsorbs organic contaminants from the air, but these are easy to remove.
The gap between the electrodes and the resonator act as two small series capacitors, making the crystal less sensitive to circuit influences. Lithium, sodium, and hydrogen swept crystals are used for, e. The frequency of the crystal is slightly adjustable “pullable” by modifying the attached capacitances.