選擇石英晶體要了解的必要參數(shù),ECS-265.971-CD-0382晶振，由于石英晶振的多功能性，長期以來一直被認(rèn)為是創(chuàng)造準(zhǔn)確耐用計(jì)時(shí)解決方案的最佳材料。石英晶振以滿足許多不同系統(tǒng)的需求。這種多功能性對工程師來說是一個(gè)好處，但有時(shí)也會增加混亂。
為了獲得更順暢的過程，請關(guān)注以下頻率控制參數(shù)，以縮小選項(xiàng)范圍并確定與您的需求最相關(guān)的組件。
頻率
石英自然攜帶頻率，但它必須從其自然狀態(tài)轉(zhuǎn)換為用于定時(shí)解決方案的碎片或晶體。大多數(shù)石英晶體頻率介于 32.768 kHz 和 200 MHz 之間。石英晶體振蕩器必須與系統(tǒng)所需的頻率相匹配。設(shè)計(jì)電路時(shí)，請記住頻率與其他參數(shù)無關(guān)。
環(huán)境溫度下的頻率容差
工程師希望避免石英晶體振蕩器的易失性和意外行為，因此他們必須了解支持其系統(tǒng)的晶體的頻率容差。頻率容差表示在環(huán)境溫度下正常工作期間與額定晶體頻率的最大預(yù)期偏差。這是制造商提供的保證數(shù)字，只要正確使用定時(shí)解決方案，就可以確保石英晶體的振蕩頻率保持在一定范圍內(nèi)。選擇具有最大晶體頻率容差的定時(shí)解決方案，該解決方案可以安全地落在系統(tǒng)的可接受范圍內(nèi)。
頻率穩(wěn)定性

選擇石英晶體要了解的必要參數(shù),ECS-265.971-CD-0382晶振，信譽(yù)良好的ECS晶振制造商通過兩種方式識別石英晶體的頻率穩(wěn)定性：在可接受的工作溫度范圍內(nèi)的頻率偏差和每次溫度變化的頻率偏差。這些數(shù)字為工程師提供了足夠的信息，以確定適合其系統(tǒng)的時(shí)序解決方案。這使他們能夠預(yù)測溫度波動(dòng)對每個(gè)潛在定時(shí)解決方案的影響，并做出最明智的選擇。
工作溫度
石英晶體必須始終考慮的一個(gè)特征是溫度依賴性。所有石英晶振封裝在其數(shù)據(jù)表上都有溫度容差。在保證公差之外運(yùn)行并不總是會導(dǎo)致直接問題，但隨著時(shí)間的推移會導(dǎo)致功能不正常。確保采購的定時(shí)解決方案包括能夠承受所有可能條件的晶體。
頻率穩(wěn)定性
信譽(yù)良好的制造商通過兩種方式識別石英晶體的頻率穩(wěn)定性：在可接受的工作溫度范圍內(nèi)的頻率偏差和每次溫度變化的頻率偏差。這些數(shù)字為工程師提供了足夠的信息，以確定適合其系統(tǒng)的時(shí)序解決方案。能夠預(yù)測溫度波動(dòng)對每個(gè)潛在時(shí)序解決方案的影響，使工程師能夠做出最明智的選擇。
負(fù)載電容
為了在振蕩器內(nèi)保持最精確的頻率，必須考慮電路的正確負(fù)載電容。負(fù)載電容是指與石英晶體本身并聯(lián)的外部電路電容量。石英晶體專門制造用于在指定的負(fù)載電容范圍內(nèi)工作，因此必須確定系統(tǒng)的需求并將其與您采購的定時(shí)解決方案相結(jié)合。
包裝
選擇石英晶體要了解的必要參數(shù),ECS-265.971-CD-0382晶振，雖然性能不受晶體封裝尺寸的影響，但許多電路板設(shè)計(jì)失敗是因?yàn)闆]有考慮每個(gè)組件的尺寸。封裝尺寸最終取決于頻率要求。所需頻率越低，晶體需要越長。影響晶體封裝尺寸的其他因素包括：
氣密密封：為了減少老化并實(shí)現(xiàn)最佳性能，您的石英振蕩器晶體封裝將始終是密封的。雖然氣密密封是必要的，但它也會增加封裝尺寸，必須在電路設(shè)計(jì)中加以考慮。
安裝類型：THT安裝的石英晶體比SMD晶體使用更廣泛，但尺寸更大。石英振蕩器本身的尺寸無法縮小，但切換到采用SMD安裝晶體封裝的振蕩器將為您的設(shè)計(jì)節(jié)省一些空間。并非所有石英晶體相同的安裝形式，因此在原始設(shè)計(jì)中考慮空間仍然很重要。

ECS原廠編碼	型號	類型	頻率	頻率容差	頻率偏差度	負(fù)載電容
ECS-071.505-CD-0370	CSM-7	MHz Crystal	7.1505MHz	±30ppm	±20ppm	12pF
ECS-071.505-CD-0370TR	CSM-7	MHz Crystal	7.1505MHz	±30ppm	±20ppm	12pF
ECS-071.505-CDX-0370	CSM-7	MHz Crystal	7.1505MHz	±30ppm	±20ppm	12pF
ECS-098.438-CD-0371	CSM-7	MHz Crystal	9.8438MHz	±30ppm	±20ppm	12pF
ECS-098.438-CD-0371TR	CSM-7	MHz Crystal	9.8438MHz	±30ppm	±20ppm	12pF
ECS-098.438-CDX-0371	CSM-7	MHz Crystal	9.8438MHz	±30ppm	±20ppm	12pF
ECS-100-18-5P-TR	CSM-7	MHz Crystal	10MHz	±50ppm	±30ppm	18pF
ECS-100-20-5PDP-TR	CSM-7	MHz Crystal	10MHz	±100ppm	±30ppm	20pF
ECS-100-S-5P-TR	CSM-7	MHz Crystal	10MHz	±50ppm	±30ppm	Series
ECS-110.5-20-5P-TR	CSM-7	MHz Crystal	11.0592MHz	±50ppm	±30ppm	20pF
ECS-110.5-32-5P-TR	CSM-7	MHz Crystal	11.0592MHz	±50ppm	±30ppm	32pF
ECS-110.5-S-5P-TR	CSM-7	MHz Crystal	11.0592MHz	±50ppm	±30ppm	Series
ECS-110-S-5P-TR	CSM-7	MHz Crystal	11MHz	±50ppm	±30ppm	Series
ECS-120.003-18-5PTR	CSM-7	MHz Crystal	12.000393MHz	±50ppm	±30ppm	18pF
ECS-120-18-5P-TR	CSM-7	MHz Crystal	12MHz	±50ppm	±30ppm	18pF
ECS-120-20-5PDN-TR	CSM-7	MHz Crystal	12MHz	±100ppm	±30ppm	20pF
ECS-120-32-5P-TR	CSM-7	MHz Crystal	12MHz	±50ppm	±30ppm	32pF
ECS-120-S-5P-TR	CSM-7	MHz Crystal	12MHz	±50ppm	±30ppm	Series
ECS-122.8-20-5P-TR	CSM-7	MHz Crystal	12.288MHz	±50ppm	±30ppm	20pF
ECS-122.8-S-5P-TR	CSM-7	MHz Crystal	12.288MHz	±50ppm	±30ppm	Series
ECS-130.625-CD-0373	CSM-7	MHz Crystal	13.0625MHz	±30ppm	±20ppm	12pF
ECS-130.625-CD-0373TR	CSM-7	MHz Crystal	13.0625MHz	±30ppm	±20ppm	12pF
ECS-130.625-CDX-0373	CSM-7	MHz Crystal	13.0625MHz	±30ppm	±20ppm	12pF
ECS-135.600-CD-0374	CSM-7	MHz Crystal	13.56MHz	±30ppm	±20ppm	12pF
ECS-135.600-CD-0374TR	CSM-7	MHz Crystal	13.56MHz	±30ppm	±20ppm	12pF
ECS-135.600-CDX-0374	CSM-7	MHz Crystal	13.56MHz	±30ppm	±20ppm	12pF
ECS-135.60-CDX-0317-TR	CSM-7	MHz Crystal	13.56MHz	±50ppm	±30ppm	10pF
ECS-143-20-5PDN-TR	CSM-7	MHz Crystal	14.31818MHz	±100ppm	±30ppm	20pF
ECS-143-20-5P-TR	CSM-7	MHz Crystal	14.31818MHz	±50ppm	±30ppm	20pF
ECS-143-S-5P-TR	CSM-7	MHz Crystal	14.31818MHz	±50ppm	±30ppm	Series
ECS-147.4-20-5P-TR	CSM-7	MHz Crystal	14.7456MHz	±50ppm	±30ppm	20pF
ECS-147.4-S-5P-TR	CSM-7	MHz Crystal	14.7456MHz	±50ppm	±30ppm	Series
ECS-150-S-5P-TR	CSM-7	MHz Crystal	15MHz	±50ppm	±30ppm	Series
ECS-160.003-18-5PTR	CSM-7	MHz Crystal	16.000312MHz	±50ppm	±30ppm	18pF
ECS-160-20-5PDN-TR	CSM-7	MHz Crystal	16MHz	±100ppm	±30ppm	20pF
ECS-160-20-5P-TR	CSM-7	MHz Crystal	16MHz	±50ppm	±30ppm	20pF
ECS-160-S-5P-TR	CSM-7	MHz Crystal	16MHz	±50ppm	±30ppm	Series
ECS-162.5-20-5P-TR	CSM-7	MHz Crystal	16.257MHz	±50ppm	±30ppm	20pF
ECS-162.5-S-5P-TR	CSM-7	MHz Crystal	16.257MHz	±50ppm	±30ppm	Series
ECS-180-S-5P-TR	CSM-7	MHz Crystal	18MHz	±50ppm	±30ppm	Series
ECS-184-18-5P-TR	CSM-7	MHz Crystal	18.432MHz	±50ppm	±30ppm	18pF
ECS-184-20-5PDN-TR	CSM-7	MHz Crystal	18.432MHz	±100ppm	±30ppm	20pF
ECS-184-20-5P-TR	CSM-7	MHz Crystal	18.432MHz	±50ppm	±30ppm	20pF
ECS-184-S-5P-TR	CSM-7	MHz Crystal	18.432MHz	±50ppm	±30ppm	Series
ECS-196.6-20-5P-TR	CSM-7	MHz Crystal	19.6608MHz	±50ppm	±30ppm	20pF
ECS-196.6-S-5P-TR	CSM-7	MHz Crystal	19.6608MHz	±50ppm	±30ppm	Series
ECS-196-20-5PDN-TR	CSM-7	MHz Crystal	19.6608MHz	±100ppm	±30ppm	20pF
ECS-200-16-5P-TR	CSM-7	MHz Crystal	20MHz	±50ppm	±30ppm	16pF
ECS-200-20-5PDN-TR	CSM-7	MHz Crystal	20MHz	±100ppm	±30ppm	20pF
ECS-200-20-5P-TR	CSM-7	MHz Crystal	20MHz	±50ppm	±30ppm	20pF
ECS-200-S-5P-TR	CSM-7	MHz Crystal	20MHz	±50ppm	±30ppm	Series
ECS-203.563-CD-0375	CSM-7	MHz Crystal	20.3563MHz	±30ppm	±20ppm	12pF
ECS-203.563-CD-0375TR	CSM-7	MHz Crystal	20.3563MHz	±30ppm	±20ppm	12pF
ECS-203.563-CDX-0375	CSM-7	MHz Crystal	20.3563MHz	±30ppm	±20ppm	12pF
ECS-204.8-20-5P-TR	CSM-7	MHz Crystal	20.48MHz	±50ppm	±30ppm	20pF
ECS-226.278-CD-0376	CSM-7	MHz Crystal	22.6278MHz	±30ppm	±20ppm	12pF
ECS-226.278-CD-0376TR	CSM-7	MHz Crystal	22.6278MHz	±30ppm	±20ppm	12pF
ECS-226.278-CDX-0376	CSM-7	MHz Crystal	22.6278MHz	±30ppm	±20ppm	12pF
ECS-232.643-CD-0377	CSM-7	MHz Crystal	23.2643MHz	±30ppm	±20ppm	12pF
ECS-232.643-CD-0377TR	CSM-7	MHz Crystal	23.2643MHz	±30ppm	±20ppm	12pF
ECS-232.643-CDX-0377	CSM-7	MHz Crystal	23.2643MHz	±30ppm	±20ppm	12pF
ECS-235.122-CD-0378	CSM-7	MHz Crystal	23.5122MHz	±30ppm	±20ppm	12pF
ECS-235.122-CD-0378TR	CSM-7	MHz Crystal	23.5122MHz	±30ppm	±20ppm	12pF
ECS-235.122-CDX-0378	CSM-7	MHz Crystal	23.5122MHz	±30ppm	±20ppm	12pF
ECS-240.001-18-5PTR	CSM-7	MHz Crystal	24.00014MHz	±50ppm	±30ppm	18pF
ECS-240-16-5P-TR	CSM-7	MHz Crystal	24MHz	±50ppm	±30ppm	16pF
ECS-240-20-5PDN-TR	CSM-7	MHz Crystal	24MHz	±100ppm	±30ppm	20pF
ECS-240-20-5P-TR	CSM-7	MHz Crystal	24MHz	±50ppm	±30ppm	20pF
ECS-240-S-5P-TR	CSM-7	MHz Crystal	24MHz	±50ppm	±30ppm	Series
ECS-245.7-20-5P-TR	CSM-7	MHz Crystal	24.576MHz	±50ppm	±30ppm	20pF
ECS-250-18-5P-F-TR	CSM-7	MHz Crystal	25MHz	±50ppm	±30ppm	18pF
ECS-252.235-CD-0379	CSM-7	MHz Crystal	25.2235MHz	±30ppm	±20ppm	12pF
ECS-252.235-CD-0379TR	CSM-7	MHz Crystal	25.2235MHz	±30ppm	±20ppm	12pF
ECS-254.563-CD-0380	CSM-7	MHz Crystal	25.4563MHz	±30ppm	±20ppm	12pF
ECS-254.563-CD-0380TR	CSM-7	MHz Crystal	25.4563MHz	±30ppm	±20ppm	12pF
ECS-254.563-CDX-0380	CSM-7	MHz Crystal	25.4563MHz	±30ppm	±20ppm	12pF
ECS-264.513-CD-0381	CSM-7	MHz Crystal	26.4513MHz	±30ppm	±20ppm	12pF