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溫度變化對(duì)石英晶體的影響CM200C32768EZFT

返回列表 來(lái)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(méi)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(lái)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(lái)相互通信。如果沒(méi)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(wàn)分之幾(ppm)來(lái)衡量，這意味著:1ppm =百萬(wàn)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(lái)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(lái)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(guò)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)

1

溫度靈敏度是三次拋物線的函數(shù)。在切割過(guò)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(guò)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。

2

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)。

3

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(wèn)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(lè)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