402F270XXCJT

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Crystals are materials composed of a various number of atoms held together in a specific 3-dimensional array. This arrangement, or \'lattice structure\', forms the crystalline structure by which various materials, such as quartz, can be classified. Crystals have a wide range of applications, such as providing the time accuracy of a conventional quartz time-keeping device or providing automatic frequency control in a mobile terminal.

Among these crystals is the 402F270XXCJT crystal, an oven-controlled crystal oscillator (OCXO) designed for precision frequency control in radio communications, navigation and signal processing. This OCXO also features a built-in voltage regulator, thermal compensation and shock/vibration tolerance in a hermetically sealed-package. The 402F270XXCJT is designed with a nominally 25 x 25 mm, 7-lead surface-mountable package and can operate from -10°C to +70°C.

In terms of application fields, the 402F270XXCJT is applicable in a variety of circumstances where precise frequency control is required. This includes both civil and military avionics, which require real-time synchronization between airborne and ground systems, as well as issues of altitude, speed and reference direction. This is especially beneficial for applications such as Electronic Support Measures (ESM) and Electronic Warfare (EW). The 402F270XXCJT is also suitable for global navigation satellite systems (GNSS), remote sensing, communications, radars and digital signal processing.

The working principles of the 402F270XXCJT crystal are quite specific as well. This type of OCXO is designed to maintain a constant output frequency over temperature and frequency variations. This is achieved in two ways. Firstly, the device utilizes a PTC (positive temperature coefficient) tube, made from sapphire or quartz, which prevents the frequency from becoming too low or too high as the temperature changes. The second way is by using an explicit analog or digital temperature compensated oscillator (TCO) to further reduce the oscillation slight frequency variations.

The actual operation of the 402F270XXCJT oscillator is twofold: it utilizes both a crystal vibrating at a specific frequency and an electronic resonator that is used to tune the circuit to the desired output frequency. A number of other components, such as capacitors, inductors and resistors, are used to improve the quality of the output signal, while damping and other reinforcements are used to reduce the effects of noise on the circuit. The TCO then works to maintain a constant frequency over its whole range of temperature, correcting any frequency offset.

In conclusion, the 402F270XXCJT crystal is a precision frequency control device. It is applicable in a variety of settings, including avionics, GNSS, remote sensing, communications and digital signal processing, for the purpose of real-time synchronization between different systems or for regulating radio frequency output. It features a built-in voltage regulator, thermal compensation and shock/vibration tolerance and works by using a combination of a crystal vibrating and an electronic resonator with a temperature compensated oscillator.

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