Cardinal Oscillator Crystal解決方案,美國(guó)知名元器件供應(yīng)商Cardinal公司，主要向世界各地提供低功耗低成本的石英晶振產(chǎn)品為主，隨著自身的技術(shù)增長(zhǎng)，Cardinal公司開(kāi)始追尋自身偉大的目標(biāo)，致力于為用戶(hù)提供具有核心競(jìng)爭(zhēng)力的產(chǎn)品，以及提供優(yōu)質(zhì)的產(chǎn)品為主要目標(biāo)，同時(shí)在選擇上面擁有超級(jí)靈活性和多元化，使得用戶(hù)可以隨時(shí)在Cardinal公司找到自身理想的產(chǎn)品，以及滿(mǎn)意的解決方案，也因此更多用戶(hù)選擇與之建立良好的合作關(guān)系。
在開(kāi)發(fā)電子組件時(shí)，其中一個(gè)步驟包括選擇合適的頻率控制產(chǎn)品。開(kāi)始時(shí)的基本問(wèn)題是安裝石英晶體還是振蕩器。為了做出正確的決定，需要考慮幾個(gè)參數(shù)。這些包括應(yīng)用、設(shè)備或行業(yè)的許多不同要求。除了空間要求、頻率穩(wěn)定性和專(zhuān)業(yè)知識(shí)之外，開(kāi)發(fā)成本也起著重要作用。

石英晶體還是SPXO晶體振蕩器？這就是問(wèn)題所在！在下文中，我們將更深入地了解一個(gè)組件或另一個(gè)組件是更好選擇的情況:

當(dāng)石英晶體是正確的選擇時(shí)

“答石英晶體最適合開(kāi)發(fā)人員想要構(gòu)建自己的電子振蕩器，允許他們調(diào)整或優(yōu)化所有相關(guān)參數(shù)的時(shí)候。這當(dāng)然需要一定的努力:電子振蕩器必須構(gòu)建并適應(yīng)諧振器，以確保在整個(gè)工作溫度范圍內(nèi)的振蕩穩(wěn)定性和凝聚力，”產(chǎn)品經(jīng)理解釋道。例如，電路元件包括電容器，必須選擇電容器，以便實(shí)現(xiàn)石英晶體的特定負(fù)載能力。如果不是這種情況，可能會(huì)出現(xiàn)與額定頻率相當(dāng)大的偏差。因此，必須事先明確定義石英晶體的規(guī)格，以避免頻率偏差。

然而，由于石英晶體比晶體振蕩器便宜，所以它們是更大數(shù)量的更好選擇。此外，電路板上必須有足夠的空間:帶電路的壓電晶體比晶體振蕩器需要更多的空間。

完美協(xié)調(diào)的完整解決方案:晶體振蕩器

當(dāng)使用振蕩器內(nèi)部安裝電路的所有元件已經(jīng)完全匹配。與帶電路的石英晶體相比，振蕩器通常占用更少的空間。振蕩器總是包含一個(gè)頻率控制元件，在我們的例子中是一個(gè)石英晶體。這是插入到皮爾斯電路，導(dǎo)致石英晶體振蕩器。Cardinal Oscillator Crystal解決方案.

振蕩器電路

因此，有源晶體振蕩器是最節(jié)省空間的選擇:一切都很緊湊，內(nèi)置在一個(gè)組件中，開(kāi)發(fā)人員不必圍繞壓電晶體設(shè)計(jì)電路。該元件特別適用于小批量生產(chǎn)，因?yàn)樗撕臅r(shí)的電路元件優(yōu)化和調(diào)諧的需要。

振蕩器的另一個(gè)優(yōu)點(diǎn)是，當(dāng)使用石英晶體時(shí)，面積與厚度之比不能低于某個(gè)值。如果不保持這個(gè)比例，它將對(duì)電參數(shù)產(chǎn)生負(fù)面影響。這意味著低頻(10MHz以下)不再能在更小的設(shè)計(jì)中處理。這一限制不適用于振蕩器，因?yàn)檎袷幤鲀?nèi)部有一個(gè)IC。這同樣適用于頻率更高的電路，石英晶體也能更快地達(dá)到其物理極限。由于內(nèi)置IC，還可以通過(guò)溫度進(jìn)行補(bǔ)償(TCXOs)。這允許開(kāi)發(fā)者有更多的操作空間，以滿(mǎn)足相應(yīng)應(yīng)用程序及其外部影響的要求。這種偏差還允許±0.05ppm的頻率穩(wěn)定性。最好的情況下，石英晶體的含量低于百萬(wàn)分之+-10。Cardinal Oscillator Crystal解決方案.

Quartz crystal or oscillator? That is the question! In the following, we’ll take a closer look at situations when one component or the other is the better choice:

When a quartz crystal is the way to go

“A quartz crystal is best suited when the developer wants to build their own electronic oscillator, allowing them to tune or optimize all the relevant parameters. This of course requires a certain amount of effort: The electronic oscillator has to be built and adapted to the resonator in order to ensure oscillation stability as well as cohesion over the entire operating temperature range,” explains Product Manager. Circuit components include, for example, capacitors, which must be selected so that the quartz crystal’s specific load capacity is achieved. If this is not the case, considerable deviations from the specified nominal frequency may occur. The specifications for the quartz crystal must therefore be clearly defined in advance to avoid frequency deviations.

However, since quartz crystals are less expensive than crystal oscillators, they are a better choice for larger quantities. In addition, there must be sufficient space on the circuit board: A piezoelectric crystal with circuitry requires more space than a crystal oscillator.

The perfectly coordinated complete solution: The crystal oscillator

When using an oscillator, all components of the internally installed circuitry are already perfectly matched. In contrast to a quartz crystal with circuit, the oscillator usually takes up less space. An oscillator always contains a frequency control component—in our case, an quartz crystal. This is inserted into the Pierce circuit, which causes the quartz crystal to oscillate.

The oscillator is therefore the most space-saving alternative: Everything is compact and built into one component, and the developer does not have to design a circuit around the piezoelectric crystal. The component is particularly suitable for low volumes because it eliminates the need for time-consuming optimization and tuning of circuit components.