Key Parameters for Passive Crystal Oscillator Selection
Crystal oscillators are key components that can generate clock frequency signals and are widely used in central processing units (CPUs) and other digital circuits. All CPU instruction executions rely on clock signals. The higher the clock frequency, the faster the CPU usually runs. Therefore, almost all electronic products containing CPUs contain a clock source. Even if you don't see an external oscillation circuit on some circuit boards, it's because the crystal oscillator has been integrated into the chip, which is usually called an integrated clock source. Crystal oscillators are often regarded as the "heart" of the circuit system. If the "heart" stops working, the function of the entire circuit board may be paralyzed. Therefore, the quality of crystal oscillators has become the primary consideration for many electronic equipment manufacturers when selecting components.
How to judge the quality of crystal oscillators? Some people think that it can be judged by appearance, packaging or logo. However, as an electronic component, the quality of crystal oscillators cannot be distinguished by external features alone. Usually, a "bad" crystal oscillator means that it cannot oscillate normally in the circuit, or the oscillation is unstable. Are these problems caused by quality problems or improper parameter matching? For passive crystal oscillators, understanding their key parameters is particularly important for judging their performance.
Main parameters affecting the performance of passive crystal oscillators
As an important component of the clock circuit, the performance of the passive crystal oscillator directly affects the stability and accuracy of the entire system. The passive crystal oscillator itself does not have an internal oscillation circuit and relies on an external circuit to generate oscillation. Therefore, choosing a suitable crystal oscillator and ensuring that its parameters match the circuit is the key to achieving efficient and stable operation. The following are several main parameters that affect the performance of passive crystal oscillators:
1. Frequency Tolerance
Frequency tolerance indicates the allowable deviation range of the crystal oscillator from the nominal frequency, usually expressed as a percentage or part per million (PPM). A smaller frequency tolerance means that the crystal oscillator can be closer to its nominal frequency when working, ensuring the accuracy and stability of the system. In many high-precision applications, such as communication equipment and timers, low frequency tolerance is the key to ensuring the reliable operation of the system.
For example, the common 32.768kHz crystal oscillator is usually within the range of ±20PPM. When used on occasions with strict frequency requirements, the smaller the frequency tolerance, the better the performance. The frequency tolerance of chip passive crystal oscillators is usually ±10PPM/±20PPM. For plug-in cylindrical crystal oscillators, ±5ppm is a higher level of accuracy among cylindrical crystal oscillators, followed by 10ppm, 20ppm, and 30ppm.
2. Load Capacitance
Load capacitance refers to the capacitance matching value between the passive crystal oscillator and the external circuit, which directly affects the operating frequency of the crystal oscillator. If the load capacitance is not selected properly, the crystal oscillator may not operate at the correct frequency, affecting the stability and accuracy of the oscillation circuit. Common load capacitances for tuning fork crystals are 6pF, 7pF, 9pF, and 12.5pF; common load capacitances for MHZ crystal oscillators are 12PF and 20PF, followed by 8PF, 9PF, 15PF, 18PF, etc. When designing, it is necessary to select the appropriate load capacitance according to the circuit and crystal oscillator parameters.
For precision applications, the load capacitance needs to be accurately matched to ensure the stability of the frequency, especially in the clock circuit, where slight errors in the load capacitance may cause the frequency drift of the system.
3. Equivalent Series Resistance (ESR)
ESR is a parameter that measures the internal energy loss of a passive crystal oscillator, and refers to the internal impedance generated by the crystal when it oscillates. Lower ESR usually means that the crystal oscillator can generate oscillation signals more efficiently while reducing energy loss, thereby improving the startup performance and frequency stability of the circuit.
If the ESR is too high, it may cause the crystal oscillator to be difficult to start or have poor frequency stability. Therefore, the size of the ESR needs to be considered when selecting a passive crystal oscillator, especially for low-power designs, where low-ESR crystal oscillators are preferred.
4. Frequency vs. Temperature Stability
Temperature changes can affect the oscillation frequency of the crystal oscillator. The frequency-temperature characteristic describes the frequency drift of the crystal oscillator at different temperatures. For some industrial or automotive applications, the crystal oscillator is required to maintain high frequency stability under extreme temperature conditions. For example, the operating temperature range of industrial-grade crystal oscillators is usually -40℃ to 85℃, while automotive applications require a wider temperature range, such as -40℃ to 125℃.
Selecting a crystal oscillator with good temperature characteristics can ensure that the device can maintain stable operation in extreme environments.
The performance of a passive crystal oscillator is determined by multiple key parameters. Factors such as frequency tolerance, load capacitance, ESR, and frequency-temperature characteristics jointly affect the performance of the crystal oscillator in the circuit. When selecting and applying a passive crystal oscillator, it is necessary to reasonably match these parameters to ensure that the electronic equipment can operate stably and efficiently for a long time.
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Technical Characteristics of Crystal Oscillators and Their Applications in Modern Electronic Systems
Crystal Oscillator is an electronic component that uses the piezoelectric effect of quartz crystal to generate a stable frequency signal. Due to their excellent frequency stability, long life and high accuracy, crystal oscillators play a vital role in modern electronic systems. Whether in communications, navigation, consumer electronics or high-precision test equipment, crystal oscillators are widely used and are the basis for the normal operation of many systems.
Where are Quartz Crystals Used?
Crystal Resonators and Oscillators are well known for their use in applications demanding precise and stable frequency, or accurate timing.
Does a Passive Crystal Oscillator Have a Direction?
A passive crystal oscillator has no direction, and the pins of a passive crystal oscillator do not distinguish between positive and negative poles.
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YXC扬兴科技产品手册
扬兴晶振 - 可编程VCTCXO,TCXO,汽车级石英晶体,石英可编程晶振,CMOS晶体振荡器,炉控晶体振荡器,MHZ QUARTZ CRYSTALS,压控温度补偿振荡器,可编程TCXO,PROGRAMMABLE OSC,三级钟,可编程VCXO-CMOS输出,VC语言,PROGRAMMABLE VCXO-DIFFERENTIAL OUTPUT,汽车级振荡器,32.768KHZ TUNING FORK QUARTZ CRYSTALS,差分晶体振荡器,时钟频率器件,PROGRAMMABLE VCTCXO,可编程展频振荡器,可编程SSXO,AUTOMOTIVE GRADE QUARTZ OSCILLATORS,VC,可编程温度补偿振荡器,可编程压控温度补偿振荡器,兆赫石英晶体,可编程SPXO-CMOS输出,SPXO-CMOS输出,32.768KHZ音叉石英晶体,汽车级谐振器,可编程SPXO差分输出,可编程CMOS压控晶体振荡器,实时时钟芯片,32.768KHZ石英晶体谐振器,PROGRAMMABLE SSXO,VCTCXO,MHZ 石英晶体谐振器,PROGRAMMABLE SPXO-DIFFERENTIAL OUTPUT,恒温晶体振荡器,温度补偿振荡器,AUTOMOTIVE GRADE QUARTZ CRYSTALS,可编程振荡器,汽车级石英振荡器,锁相环芯片,PROGRAMMABLE VCXO-CMOS OUTPUT,PROGRAMMABLE SPXO-CMOS OUTPUT,SPXO-CMOS OUTPUT,OVEN CONTROLLED CRYSTAL OSCILLATOR,晶振,可编程VCXO差分输出,可编程CMOS晶体振荡器,可编程差分晶体振荡器,可编程差分压控晶体振荡器,PROGRAMMABLE TCXO,YSX221TS,YSO130HR,YSO510TP,Y5O250PT,YSV310PR,YOV14095M,YSO230LR,YSX5315L,YSO120TK,YSV350TP,YSX5315C,YST310S,YSX2115L,YSX16105K,YOV2020DP,YOV2525DP,YSX306GA,YSV221PJ,YSO210PR,YSV531PT,YSX146GA,YSO231LJ,YSX20125K,YSX2115C,YSX16125C,YSO171PS,YT-26,YSO110TR,YSX1612SL,YSO140TC,YOV3627DP,YSO150HT,YSO511PJ,YSV311PJ,HC-49XSMD,YSO131LR,Y5O692PR,YSO512ET,YOV25225M,YOV5050DP,YSX12105L,YSX3215L,YSX5305C,YT-38,YSX3215C,HC-49US,YSO211PJ,YSO251PJ,YSO690PR,HC-49SMD,YOV0907SM,YSV322PT,YSV220PR,Y5X532GC,YSX530GA,YSO691ER,Y5X2215C,YSX211TS,YSX2215L,军工,车载,通信,医疗,工业
How to Distinguish Active and Passive Four-pin Crystal Oscillators?
Crystal oscillators are usually divided into two types: passive crystal oscillators and active crystal oscillators. In this article YXC will introduce how to distinguish active and passive four-pin crystal oscillators.
YXC automotive grade resonator 8MHz, Passive Crystal Oscillator 3225 Package for Car Bluetooth Module
Bluetooth module is a PCBA board with integrated Bluetooth function, which is used for short-distance wireless communication. It is divided into Bluetooth data module and Bluetooth voice module according to its function. Bluetooth module refers to a collection of basic circuits of chips with integrated Bluetooth function, which is used for wireless network communication.
YXC Constant Temperature Crystal Oscillator, Ultra-high Precision, Ultra-high Reliability Clock Signal Solution
An oven-controlled crystal oscillator (OCXO) is a high-performance oscillator that uses constant temperature box technology to accurately control the crystal oscillation frequency. By placing the crystal in a constant temperature environment, OCXO can greatly reduce the impact of ambient temperature changes on the oscillation frequency, thereby providing ultra-high frequency stability and accuracy. OCXO is widely used in high-tech fields such as communications, navigation, measuring instruments, military industry, aerospace, and power systems.
YXC Automotive Resonator 8MHz, load 20PF, Operating Temperature -40~125℃, Used in Vehicle Reversing Radar
In addition, the frequency of the crystal oscillator will be selected and adjusted according to specific requirements to meet the accurate measurement needs of the reversing radar system. If the crystal oscillator frequency is inaccurate or there is jitter, it will lead to an increase in measurement errors or misalignment of data processing, thereby affecting the accuracy and reliability of the reversing radar.
Temperature Compensated Crystal Oscillator Is Also One of The Quartz Crystal Oscillators, Referred to as “temperature Compensated Crystal Oscillator“
What are the characteristics of temperature compensated crystal oscillator? Because electronic products in different fields have different demands for quartz crystal oscillators, and temperature-compensated crystal oscillators were developed to compensate for the instability of ordinary crystal oscillators at high temperatures. However, temperature-compensated crystal oscillators have There are many types of temperature compensated crystal oscillators, each with its own characteristics.
YXC 24MHz Car-standard resonator, Load 8PF, Operating Temperature -40~125℃, Used in Body Domain Control-TMCU Geely
The body domain controller is one of the key components of modern automotive electronic systems. It is an intelligent control unit that can centrally control various electronic modules and systems of the body. Its main function is to process and manage information from body electronic modules and coordinate communication and data transmission between various modules to achieve unified management and control of the body system.
扬兴晶振（YXC）石英可编程晶振选型指南
公司介绍 Quartz Crystals SPXO TCXO/VCTCXO Programmable SPXO/TCXO Programmable VCXO/VCTCXO Automotive Grade
扬兴晶振 - RTC,可编程VCTCXO,TCXO,汽车级石英晶体,石英晶体,石英可编程晶振,VCTCXO,VC-TCXO,VCXO,PROGRAMMABLE SPXO,QUARTZ CRYSTALS,振荡器,可编程TCXO,石英晶体谐振器,可编程VCXO,TUNING FORK QUARTZ CRYSTALS,射频时钟芯片,AUTOMOTIVE GRADE QUARTZ CRYSTALS,汽车级石英振荡器,PROGRAMMABLE VCTCXO,可编程SPXO,AUTOMOTIVE GRADE QUARTZ OSCILLATORS,音叉石英晶体,实时时钟,SPXO,PROGRAMMABLE VCXO,石英晶体振荡器,PROGRAMMABLE TCXO,可编程晶振,YSX1612SL,YSO140TC,YSX211SL,YSX221TS,YSO130HR,YSO150HT,YSO511PJ,YSO510TP,YSV311PJ,YSX1610SK,HC-49XSMD,YSX1612SC,YSX2012SK,YSX211SC,YSV310PR,YSO230LR,YSO120TK,YSV350TP,YT-38,HC-49US,YST310S,YSO211PJ,YSX306GA,YSV221PJ,YSX532GC,YSO690PR,YSO210PR,YSO250PT,YSV531PT,HC-49SMD,YSX146GA,YSO231LJ,YSO692PR,YSV322PT,YSV220PR,YSX1210SL,YSX321SL,YSX221SC,YSX531SL,YSX530GA,YSO691ER,YSX321SC,YT-26,YSX221SL,YSX211TS,YSX531SC,YSO110TR,YSX530SC,军工,医疗,车载,通信,工业
The Precise Pulse of Low-Altitude Economy - Crystal Oscillator
As a key technology in the field of low-altitude economy, crystal oscillators will continue to provide a solid foundation for the development of low-altitude economy with their high precision and reliability. In this article, YXC recommends three temperature-compensated crystal oscillator (TCXO) products to meet the needs of different solutions.
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