AX7DCF1-781.2500C

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Oscillators

Oscillators are electronic components that generate a repeating electrical signal. They are used to control the frequency and timing of electronic circuits. The AX7DCF1-781.2500C is an oscillator designed for use in the telecommunications industry. This application note provides an overview of its application field and working principle.

Application Field

The AX7DCF1-781.2500C is an oscillator designed for use in the telecommunications industry. It is a dual-frequency quartz crystal oscillator designed for use in GSM and CDMA cell phone base station applications. It is also suitable for use in digital cellular telecommunication and transmission systems such as TDMA, CDMA, GSM and PCS. It is a highly accurate clock oscillator with a stability of better than ±10.0 ppb over the -30°C to +80°C temperature range. The output frequency range is 781.249994 MHz to 781.250006 MHz.

Working Principle

The AX7DCF1-781.2500C is a quartz crystal oscillator that uses a quartz crystal as the resonant element in a feedback oscillator circuit. Its primary components are a quartz crystal, a transimpedance amplifier, a voltage-controlled oscillator (VCO), a phase-locked loop (PLL) and a drive circuit. The quartz crystal is the resonant element in the oscillator circuit. It is cut and formed to vibrate at a specific frequency when an alternating electric current is applied to it. The oscillating frequency is determined by the physical dimensions of the quartz crystal. The transimpedance amplifier converts the input electrical signal into a voltage signal and then passes the signal to the VCO. The VCO is a device that generates an oscillating electrical signal having a frequency determined by an adjustable voltage signal applied to its input. The output of the VCO is the reference signal for the PLL. The PLL is a device that provides automatic frequency control by adjusting the oscillator frequency to match the reference signal. The PLL then feeds the oscillator signal to the drive circuit, which amplifies the signal and provides the required output level.

The AX7DCF1-781.2500C oscillator is designed to provide stable, low-jitter square waves over its specified operating temperature range. Its low power consumption and small size make it ideal for applications that require low-power, highly reliable oscillators. The oscillator has been proven to perform consistently and reliably in numerous laboratory and field tests.

The AX7DCF1-781.2500C laser-trimmed quartz crystal oscillator from HXF Electronics is a reliable and cost-effective solution for telecommunications applications. It provides a highly stable, low-noise output signal that is ideal for cellular and wireless base station applications.

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