溫度變化對(duì)石英晶體的影響CM200C32768EZFT

來源：金洛鑫瀏覽：- 發(fā)布日期：2023-06-20 16:50:20【大中小】

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如今，沒有石英晶體的節(jié)假日是不可想象的！為什么？因?yàn)榧词故乾F(xiàn)代的戶外照明時(shí)間開關(guān)也需要石英來獲得準(zhǔn)確的時(shí)間基準(zhǔn)。此外，我們的許多禮物都是基于最先進(jìn)的電子產(chǎn)品。手機(jī)、智能手表、個(gè)人電腦——它們都需要高精度的頻率給定元件來相互通信。如果沒有這種交流，它們的用處就會(huì)受到嚴(yán)重限制，甚至不存在。這些設(shè)備通常從石英接收必要的驅(qū)動(dòng)節(jié)奏，石英是這種設(shè)備的現(xiàn)代“心臟”。

振蕩晶體會(huì)隨著溫度的變化而改變其行為和電氣特性。因此，溫度變化會(huì)導(dǎo)致頻率偏差。這種偏差以“百萬分之幾(ppm)來衡量，這意味著:1ppm =百萬分之一= 0.000001 = 0.0001%。AT切割晶體的溫度敏感性

MHz范圍內(nèi)的振蕩晶體也稱為AT切割晶體。它們包含薄石英晶片，即所謂的石英坯。at切割石英坯是以35°的AT角從石英塊上切割下來的。坯件的厚度基本上決定了室溫下的基頻。然而，石英坯從石英塊上切割下來的準(zhǔn)確角度是造成其他溫度下頻率偏差的原因。如果在切割過程中非常精確地達(dá)到35° 15′的理想角度，石英對(duì)溫度的敏感度就會(huì)降低。

如下圖，您可以看到不同的切割角度選項(xiàng)

溫度靈敏度是三次拋物線的函數(shù)。在切割過程中，即使是單角秒范圍內(nèi)的最小誤差也會(huì)導(dǎo)致曲線圍繞拐點(diǎn)旋轉(zhuǎn)。這惡化了后續(xù)應(yīng)用所需溫度范圍內(nèi)的溫度靈敏度。在坯件的制造過程中，由于可能的最大制造精度，完美的切割角度只能在有限的范圍內(nèi)實(shí)現(xiàn)。因此，制造的毛坯必須根據(jù)它們的偏差進(jìn)行分類，并根據(jù)它們的精度用于合適的晶體。

圖1:由交角偏差產(chǎn)生的頻率偏差對(duì)溫度的曲線

音叉晶體的溫度依賴性

對(duì)于音叉石英晶體(也稱為時(shí)鐘晶體)，倒拋物線的函數(shù)描述了頻率的溫度依賴性。在這種情況下，溫度相關(guān)頻率偏差為0 ppm時(shí)的拋物線頂點(diǎn)在25°c，在較低和較高的溫度下，例如在該點(diǎn)的左側(cè)和右側(cè)，頻率逐漸下降，并且符合二次曲線。如果電路中的石英調(diào)整正確，將會(huì)有一個(gè)與溫度相關(guān)的滯后，例如實(shí)時(shí)時(shí)鐘。應(yīng)用程序的開發(fā)人員一定要考慮到這一點(diǎn)。

圖2:拋物線描述了音叉晶體頻率的溫度依賴性

這對(duì)應(yīng)用程序意味著什么？

兩條溫度曲線都表明極端溫度對(duì)石英晶體的頻率有影響。對(duì)于大多數(shù)應(yīng)用而言，與溫度相關(guān)的微小頻率變化(例如-40°C至+85°C范圍內(nèi)的+/-15 ppm)不成問題。然而，如果需要更精確的頻率，建議使用溫度補(bǔ)償晶體振蕩器，稱為TCXO晶振。這提供了非常高的頻率精度，即使在很寬的溫度范圍內(nèi)也能達(dá)到幾個(gè)ppm。

如有任何需求可以隨時(shí)聯(lián)系我們，我們很樂意為您的應(yīng)用選擇合適的時(shí)鐘發(fā)生器提供建議。

原廠編碼	生產(chǎn)廠家	型號(hào)	頻率	頻率偏差	負(fù)載電容	工作溫度
CM13032768DZFT	Citizen 晶振	CM130	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM13032768DZFT	Citizen 晶振	CM130	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CFS-20632768DZFB	Citizen 晶振	CFS-206	32.768kHz	±20ppm	12.5pF	-20°C ~ 70°C
CM200C32768AZFT	Citizen 晶振	CM200C	32.768kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM200C32768AZFT	Citizen 晶振	CM200C	32.768kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM200C32768DZFT	Citizen 晶振	CM200C	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM200C32768DZFT	Citizen 晶振	CM200C	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM200C32768DZFT	Citizen 晶振	CM200C	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM200C32768EZFT	Citizen 晶振	CM200C	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CM200C32768EZFT	Citizen 晶振	CM200C	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CM200C32768EZFT	Citizen 晶振	CM200C	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CFS-20632768HZFB	Citizen 晶振	CFS-206	32.768kHz	±5ppm	12.5pF	-20°C ~ 70°C
CM250C100000AZFT	Citizen 晶振	CM250C	100kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C100000AZFT	Citizen 晶振	CM250C	100kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C100000AZFT	Citizen 晶振	CM250C	100kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C32000AZFT	Citizen 晶振	CM250C	32kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C32000AZFT	Citizen 晶振	CM250C	32kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C32000AZFT	Citizen 晶振	CM250C	32kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C96000AZFT	Citizen 晶振	CM250C	96kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C96000AZFT	Citizen 晶振	CM250C	96kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C96000AZFT	Citizen 晶振	CM250C	96kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM41532768DZCT	Citizen 晶振	CM415	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM41532768DZCT	Citizen 晶振	CM415	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM41532768DZCT	Citizen 晶振	CM415	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM41532768DZFT	Citizen 晶振	CM415	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM41532768DZFT	Citizen 晶振	CM415	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM41532768DZFT	Citizen 晶振	CM415	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CFS-20632768AZFB	Citizen 晶振	CFS-206	32.768kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFS-20632768DZYB	Citizen 晶振	CFS-206	32.768kHz	±20ppm	7pF	-20°C ~ 70°C
CFS-20632768DZCB	Citizen 晶振	CFS-206	32.768kHz	±20ppm	9pF	-20°C ~ 70°C
CM200C32768DZBT	Citizen 晶振	CM200C	32.768kHz	±20ppm	6pF	-40°C ~ 85°C
CM200C32768DZBT	Citizen 晶振	CM200C	32.768kHz	±20ppm	6pF	-40°C ~ 85°C
CM200C32768DZBT	Citizen 晶振	CM200C	32.768kHz	±20ppm	6pF	-40°C ~ 85°C
CFS-20632768EZBB	Citizen 晶振	CFS-206	32.768kHz	±10ppm	6pF	-20°C ~ 70°C
CFS-20632768EZFB	Citizen 晶振	CFS-206	32.768kHz	±10ppm	12.5pF	-20°C ~ 70°C
CM2012H32768DZFT	Citizen 晶振	CM2012H	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM2012H32768DZFT	Citizen 晶振	CM2012H	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM2012H32768DZFT	Citizen 晶振	CM2012H	32.768kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM41532768DZYT	Citizen 晶振	CM415	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM41532768DZYT	Citizen 晶振	CM415	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM41532768DZYT	Citizen 晶振	CM415	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CFV-20632000AZFB	CITIZEN 晶振	CFV-206	32kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFS-14532768DZFB	Citizen 晶振	CFS145	32.768kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20638400AZFB	Citizen 晶振	CFV-206	38.4kHz	±30ppm	12.5pF	-20°C ~ 70°C
CM250C77503AZFT	Citizen 晶振	CM250C	77.503kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C77503AZFT	Citizen 晶振	CM250C	77.503kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C77503AZFT	Citizen 晶振	CM250C	77.503kHz	±30ppm	12.5pF	-40°C ~ 85°C
CFV-20677503DZFB	Citizen 晶振	CFV-206	77.503kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20675000DZFB	Citizen 晶振	CFV-206	75kHz	±20ppm	12.5pF	-20°C ~ 70°C
CM13032768DZYT	Citizen 晶振	CM130	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM13032768DZYT	Citizen 晶振	CM130	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM13032768DZYT	Citizen 晶振	CM130	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM200C32768DZCT	Citizen 晶振	CM200C	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM200C32768DZCT	Citizen 晶振	CM200C	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM200C32768DZCT	Citizen 晶振	CM200C	32.768kHz	±20ppm	9pF	-40°C ~ 85°C
CM200C32768DZYT	Citizen 晶振	CM200C	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM200C32768DZYT	Citizen 晶振	CM200C	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM200C32768DZYT	Citizen 晶振	CM200C	32.768kHz	±20ppm	7pF	-40°C ~ 85°C
CM250C60000AZFT	Citizen 晶振	CM250C	60kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C60000AZFT	Citizen 晶振	CM250C	60kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C60000AZFT	Citizen 晶振	CM250C	60kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C77500AZFT	Citizen 晶振	CM250C	77.5kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C77500AZFT	Citizen 晶振	CM250C	77.5kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C77500AZFT	Citizen 晶振	CM250C	77.5kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C36000AZFT	Citizen 晶振	CM250C	36kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C36000AZFT	Citizen 晶振	CM250C	36kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C36000AZFT	Citizen 晶振	CM250C	36kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38000AZFT	Citizen 晶振	CM250C	38kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38000AZFT	Citizen 晶振	CM250C	38kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38000AZFT	Citizen 晶振	CM250C	38kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38400AZFT	Citizen 晶振	CM250C	38.4kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38400AZFT	Citizen 晶振	CM250C	38.4kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C38400AZFT	Citizen 晶振	CM250C	38.4kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM41532768EZFT	Citizen 晶振	CM415	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CM41532768EZFT	Citizen 晶振	CM415	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CM41532768EZFT	Citizen 晶振	CM415	32.768kHz	±10ppm	12.5pF	-40°C ~ 85°C
CFV-206100000AZFB	Citizen 晶振	CFV-206	100kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20640000AZFB	Citizen 晶振	CFV-206	40kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20632000DZFB	Citizen 晶振	CFV-206	32kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20665536AZFB	Citizen 晶振	CFV-206	65.536kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20636000AZFB	Citizen 晶振	CFV-206	36kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFS-20632768EZYB	Citizen 晶振	CFS-206	32.768kHz	±20ppm	7pF	-20°C ~ 70°C
CFV-20668500DZFB	Citizen 晶振	CFV-206	68.5kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20668503DZFB	Citizen 晶振	CFV-206	68.5kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20640003DZFB	Citizen 晶振	CFV-206	40kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20660003DZFB	Citizen 晶振	CFV-206	60kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20660000DZFB	Citizen 晶振	CFV-206	60kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20640000DZFB	Citizen 晶振	CFV-206	40kHz	±20ppm	12.5pF	-20°C ~ 70°C
CFV-20660000AZFB	Citizen 晶振	CFV-206	60kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20676800AZFB	Citizen 晶振	CFV-206	76.8kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20696000AZFB	Citizen 晶振	CFV-206	96kHz	±30ppm	12.5pF	-20°C ~ 70°C
CM250C76800AZFT	Citizen 晶振	CM250C	76.8kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C76800AZFT	Citizen 晶振	CM250C	76.8kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C76800AZFT	Citizen 晶振	CM250C	76.8kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM200C32768HZFT	Citizen 晶振	CM200C	32.768kHz	±5ppm	12.5pF	-40°C ~ 85°C
CM200C32768HZFT	Citizen 晶振	CM200C	32.768kHz	±5ppm	12.5pF	-40°C ~ 85°C
CM200C32768HZFT	Citizen 晶振	CM200C	32.768kHz	±5ppm	12.5pF	-40°C ~ 85°C
CM250C40000AZFT	Citizen 晶振	CM250C	40kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C40000AZFT	Citizen 晶振	CM250C	40kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C40000AZFT	Citizen 晶振	CM250C	40kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM200C32768AZBT	Citizen 晶振	CM200C	32.768kHz	±30ppm	6pF	-40°C ~ 85°C
CFS-20632768HZBB	Citizen 晶振	CFS-206	32.768kHz	±5ppm	6pF	-20°C ~ 70°C
CFS-20632768HZCB	Citizen 晶振	CFS-206	32.768kHz	±5ppm	9pF	-20°C ~ 70°C
CFS-20632768HZYB	Citizen 晶振	CFS-206	32.768kHz	±5ppm	7pF	-20°C ~ 70°C
CM200C32768EZBT	Citizen 晶振	CM200C	32.768kHz	±10ppm	6pF	-40°C ~ 85°C
CFV-20675000BZFB	Citizen 晶振	CFV-206	75kHz	±50ppm	12.5pF	-20°C ~ 70°C
CFV-20677500BZFB	Citizen 晶振	CFV-206	77.5kHz	±50ppm	12.5pF	-20°C ~ 70°C
CFV-20675000AZFB	Citizen 晶振	CFV-206	75kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20638000AZFB	Citizen 晶振	CFV-206	38kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV-20677503AZFB	Citizen 晶振	CFV-206	77.503kHz	±30ppm	12.5pF	-20°C ~ 70°C
CM250C65536AZFT	Citizen 晶振	CM250C	65.536kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM250C75000AZFT	Citizen 晶振	CM250C	75kHz	±30ppm	12.5pF	-40°C ~ 85°C
CM41532768AZCT	Citizen 晶振	CM415	32.768kHz	±30ppm	9pF	-40°C ~ 85°C
CM250C32000DZFT	Citizen 晶振	CM250C	32kHz	±20ppm	12.5pF	-40°C ~ 85°C
CM41532768DZBT	Citizen 晶振	CM415	32.768kHz	±20ppm	6pF	-40°C ~ 85°C
CFS308-32.768KDZF	Citizen 晶振	CFS308	32.768kHz	±20ppm	12.5pF	-10°C ~ 60°C
CFV206 60.005KAZF	Citizen 晶振	CFV-206	60.005kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV206 76.790KAZF	Citizen 晶振	CFV-206	76.79kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV206 76.810KAZF	Citizen 晶振	CFV-206	76.81kHz	±30ppm	12.5pF	-20°C ~ 70°C
CFV206 77.500KAZF	Citizen 晶振	CFV-206	77.5kHz	±30ppm	12.5pF	-20°C ~ 70°C