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Microprocessor Crystals
- Package Options: A7 = HC-49/U 13.5 mm tall with gull leads
- Frequency Range: 1.8432 M Hz to 150.00 M Hz
- Resistance: 7 pf Maximum
- Shunt Capacitance: 10 to 1,000 uW
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Crystal quartz (SiO2) is a very useful material for fabrication of finished optics: laser beamsplitters, AO elements, polarizing optics, prisms, windows, lenses in the ultraviolet because of its high UV, VIS and NIR transmittance, birefringence, ability to rotate plane polarized light, high damage threshold and resistance to scratching. The optical grade material is featured by the highest possible transmittance throughout the range of 190 - 2900 nm, virtual freedom from bubbles and inclusions. Grown boules are Z - crystals and about 100 mm in the direction down the optic axis that limits corresponding dimension in an optical part.
Silicon dioxide occurs naturally as sand or rock, and when melted, the resulting product is called Fused Quartz. If the silicon dioxide is synthetically derived, the material is often called Fused Silica. Fused Quartz is very pure, has a high chemical resistance, good thermal shock resistance and is very strong in compression. The low thermal expansion coefficient makes it ideal for mirrors and optical flats. It is used for viewing windows, being transparent to wavelengths from around 0.2 to 3.5 µm, insulators for electronic applications and for semi-conductor manufacturing.
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The division of light into two components (an "ordinary" and an "extraordinary ray") found in materials have two different indices of refraction in different directions (i.e. when light entering certain transparent materials, such as calcite, splits into two beams which travel at different speeds). Birefringence is also known as double refraction. Crystals possessing and exhibiting birefringence include hexagonal (such as calcite), tetragonal, and trigonal crystal classes, and are known as uniaxial. Orthorhombic, monoclinic, triclinic exhibit three indices of refraction. They are therefore trirefringent and are known as biaxial. Birefringent prisms include the Nicol prism, Glan-Foucault prism, Glan-Thompson prism, and Wollaston prism.
Another material, an excellent birefringence optical crystal undoped YVO4 is newly developed. It has very good transmission in a wide wavelength range from visible to infrared, large index of refractivity and birefringence difference. Compared to other important birefringence crystals, YVO4 has higher hardness, better fabrication property, water insoluble and man-made than calcite (CaCO3 single crystal); easier to get large, high quality crystal and lower cost than rutile (TiO2 single crystal). Those outstanding properties make YVO4 very important birefringence optical material and widely used in opto-electronic research, development and industry. For example, the optical communication system needs a huge quantity devices of undoped YVO4, such as fiber optical isolators, circulators, beam displacers, Glan polarizers and other polarizing devices.
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Greenray Industries offers a line of custom low noise XOs for both.... Custom....
Features:
Available from 1Hz to 1GHz
Stabilities down to 5ppM
Low Phase Noise
Low G-Sensivity
CMOS, Sinewave....
SMT ....
Applications:
Test Equipment
Radar
Communications
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Is a crystal oscillator which includes a varactor diode and associated circuitry allowing the frequency to be changed by application of a voltage across that diode
Typical Applications:
- Base Stations
- Test Equipment
- Telecom & Wireless Infrastructure
- Digital Switching
Features:
- 5X7 Surface Mount Package
- Reflow Process Compatible Optional
- ACMOS, TTL and LVPECL
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Pericom's offers a comprehensive product portfolio of SaRonix-eCera™ quartz crystal resonators. Our broad selection of industry-standard packages includes HC-49/U, metal surface mount, UM-1, tubular, plastic-molded, and ceramic surface-mount. These crystals function as a primary component in a broad line of precision and commodity oscillators, as well as modular timing solutions, or may be specified for direct use in electronic applications. Download the Frequency Control Decision Tree (PDF) or view the SaRonix-eCera oscillator portfolio.
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An increasing number of applications require the use of high temperature oscillators. For these applications, Statek offers the CXOHT, CXOMHT, and CXOXHT oscillators. These oscillators are designed to operate at temperatures up to 200ºC with a total frequency stability of 200 parts-per-million at this temperature. The CXOHT is offered in a 10.16 mm x 4.57 mm package. The CXOMHT oscillator is offered in a 6.50 mm x 5.00 mm package. The CXOXHT oscillator features the smallest size of the three, and is offered in a 3.20 mm x 2.50 mm package.
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The LXO oscillator has the highest accuracy and stability of all STATEK oscillators. The design consists of a CMOScompatible hybrid circuit, packaged in a hermetically-sealed metal DIP. Permanent, precision tuning of the oscillator is accomplished by laser trimming the crystal after it has been hermetically sealed in a ceramic package and connected to the oscillator circuit. This method of fine tuning allows for very tight calibration tolerance and eliminates the need for a trimming capacitor, a major source of long-term frequency drift. The specifications and characteristics of the LXO vary with frequency. The characteristics of the 32.768 kHz model are presented in this data sheet.
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A crystal oscillator is defined as a crystal and oscillation circuit combined into one package. This has the advantage of eliminating external parts needed of the oscillation and optimising the operation of the crystal.
Crystal oscillators are often used in microprocessor and microcontroller applications to generate the clock pulses upon which all subsequent timing is based.
In order to determine the exact oscillator for a particular application there are many specific requirements, which are necessary to match. Such things as load condition, stability, supply voltage, and of course package must be first considered before selecting an oscillator.
Epson offezrs a wide range of quartz crystal oscillators :
Crystal oscillator SPXO that has the output function of one frequency. Output is able to be controlled with Output enable pin or Standby pin.
Crystal oscillator programmable that the customer can freely set up output frequency.
Crystal oscillator spread spectrum that has the SS function as for the EMI measure.
Crystal oscillator low jitter that included SAW resonator for low jitter.
Crystal oscillator high stability that is designed to high accuracy in SPXO.
Crystal oscillator multi-ouput that outputs two or more pieces of frequency simultaneously.
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Pi is the largest manufacturer of Piezoaktor EN and Piezotranslatoren for applications of precision. PICMA® Piezoaktoren are momentarily the only full-ceramically isolated many sending actuators on the market. They offer superior life span and efficiency.
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A low cost quartz crystal microbalance system designed for real-time mass and viscosity measurements in processes occurring at or near surfaces, or within thin films. It comes with controller, oscillator electronics, crystal holder, and three quartz crystals. An external frequency counter and precision voltmeter (not included) are needed to complete the QCM measurement setup.
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