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溫度變化對石英晶體的影響CM200C32768EZFT

返回列表 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？因為即使是現(xiàn)代的戶外照明時間開關也需要石英來獲得準確的時間基準。此外，我們的許多禮物都是基于最先進的電子產(chǎn)品。手機、智能手表、個人電腦——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，它們的用處就會受到嚴重限制，甚至不存在。這些設備通常從石英接收必要的驅動節(jié)奏，石英是這種設備的現(xiàn)代“心臟”。

振蕩晶體會隨著溫度的變化而改變其行為和電氣特性。因此，溫度變化會導致頻率偏差。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到35° 15′的理想角度，石英對溫度的敏感度就會降低。

如下圖，您可以看到不同的切割角度選項

1

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)的最小誤差也會導致曲線圍繞拐點旋轉。這惡化了后續(xù)應用所需溫度范圍內(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)實現(xiàn)。因此，制造的毛坯必須根據(jù)它們的偏差進行分類，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)生的頻率偏差對溫度的曲線


音叉晶體的溫度依賴性

對于音叉石英晶體(也稱為時鐘晶體)，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，溫度相關頻率偏差為0 ppm時的拋物線頂點在25°c，在較低和較高的溫度下，例如在該點的左側和右側，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，將會有一個與溫度相關的滯后，例如實時時鐘。應用程序的開發(fā)人員一定要考慮到這一點。

3

圖2:拋物線描述了音叉晶體頻率的溫度依賴性


這對應用程序意味著什么？

兩條溫度曲線都表明極端溫度對石英晶體的頻率有影響。對于大多數(shù)應用而言，與溫度相關的微小頻率變化(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)也能達到幾個ppm。

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

原廠編碼 生產(chǎn)廠家 型號 頻率 頻率偏差 負載電容 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