LP122F35CDT Crystals, Oscillators, Resonators

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Crystals are essential components in electronics and are widely used in applications including medical equipment, automobile ignition systems, radios and televisions, and wristwatches. In particular, crystals are used to generate and control high frequency signals. One typical example of a crystal is the LP122F35CDT. In this article, we will discuss the application field of the LP122F35CDT and its working principle.

Application Field

The LP122F35CDT is a type of voltage-controlled crystal oscillator (VCXO) used as an electronic frequency control device. Generally, these devices use a quartz crystal to control the frequency, but crystal oscillators tend to move to higher frequencies without any external input. The LP122F35CDT was specifically designed to prevent this kind of upward frequency drift, so it is well-suited for applications that require frequency stability over time and temperature changes. Some typical applications include cellular base station, PHS and GPS systems.

Working Principle

The LP122F35CDT is constructed of two main constituents: an AT-cut quartz crystal and an integrated-circuit (IC) amplifier. The quartz crystal is used to control the oscillation frequency, while the IC amplifier is used to amplify the signal from the quartz crystal. In the case of the LP122F35CDT, the IC amplifier is a voltage-controlled differential output amplifier for driving a voltage-controlled or an EFC port.

In operation, the LP122F35CDT starts oscillating at a certain frequency when power is supplied. This oscillation frequency is determined by the characteristics of the quartz crystal, which is arranged in an AT-cut configuration. When a voltage is applied to the differential output amplifier, the output frequency of the LP122F35CDT can be controlled. The level of this voltage determines the amount of frequency shift. This frequency shift allows the LP122F35CDT to remain stable over changing temperature, time and frequency conditions.

In conclusion, the LP122F35CDT is a type of voltage-controlled crystal oscillator used to generate and control high frequency signals. It is well-suited for applications that require frequency stability over time and temperature changes, such as cellular base station, PHS and GPS systems. Its working principle is based on a quartz crystal controlled by a voltage-controlled differential output amplifier, which allows for the frequency to be adjusted.

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