Voltage-Controlled Crystal Oscillator (VCXO): Applications and Selection Guide

Voltage-Controlled Crystal Oscillator (VCXO): An Advanced Quartz Crystal Oscillator Designed for Fine Frequency Adjustment through Voltage Regulation.

1. Core Components and Working Principle:

The VCXO consists of three key components: the quartz crystal resonator unit, the varactor diode, and the oscillation circuit. Its core working principle is based on voltage control, which fine-tunes the resonant frequency of the quartz resonator to achieve dynamic frequency adjustment. This can be accomplished by adjusting the capacitance value of the varactor diode.

2. Application Fields:

VCXO plays a crucial role in the field of technology, commonly found in phase-locked loop technology, frequency synthesis, and various applications requiring frequency fine-tuning, such as audio amplifiers, high-definition television systems, wireless communication devices, satellite navigation and communication equipment, and precision measurement instruments.

3. Selection Guide:

When selecting a VCXO, the following parameters are key to determining its performance:

1. Determination of Center Frequency:

The center frequency, the nominal frequency of the crystal oscillator, is a critical indicator of the vibration frequency of the oscillator. YXC VCXOs offer frequency coverage from 10MHz to 1500MHz and can achieve extremely precise frequency settings.

2. Consideration of Frequency Stability:

Frequency stability reflects the accuracy of the oscillator's output frequency. Although voltage regulation provides flexibility in frequency adjustment, it may also affect stability. Therefore, it is recommended to choose products with higher stability. YXC VCXOs offer various stability options, such as ±25ppm to ±50ppm, and can provide customized services.

3. Selection of Frequency Pull Range:

The pull range is an indicator of the VCXO's ability to adjust frequency. YXC VCXOs typically offer a pull range of ±50ppm to ±200ppm.

4. Adaptation of Signal Output Method:

The flexibility of VCXO lies in its ability to provide various output methods, such as CMOS, LVDS, and LVPECL, to meet the needs of different projects.

5. Specification of Operating Voltage:

Operating voltage is the power supply voltage required for the VCXO to work normally. YXC VCXOs support a voltage range of 1.8V to 3.3V, with 3.3V being the most commonly used standard.

6. Matching of Package Size:

The SMD surface-mount package is the mainstream packaging method for VCXOs. YXC VCXOs offer various sizes, such as 3.2mm * 2.5mm to 7.0mm * 5.0mm, to accommodate different spatial requirements.

7. Assessment of Phase Noise and Jitter:

The judgment of frequency stability includes phase noise and jitter, which directly affect the quality of the signal waveform. When selecting a VCXO, the strictness of these two parameters should be determined based on the balance between cost and performance.

By carefully considering these parameters, users can select the most suitable VCXO for their specific application needs, ensuring that the equipment achieves optimal performance in terms of precision and reliability.

About Mandu Technology

Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.

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Website: www.manduic.com

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