一方面,这是因为32,768 kHz只能在+25°C时以±10ppm的频率公差提供,另一方面,在-40/+85°C的温度范围内的温度稳定性大于-180 ppm。此外,老化约。在计算精度时必须考虑10年后±30 PPM。在最坏的情况下,32,768 kHz晶体的最大频率稳定性为+40/-220 ppm(包括在+25°C下的调整,温度稳定性和10年后的老化)。外部电路电容必须能够补偿由要同步的ic振荡器级的内部电容和杂散电容引起的任何系统频率偏移。为32.768晶振选择无外部电路电容的布局包含很大的风险,因为在批量生产期间,32.768晶振的精度既不能校正也不能调整以适应突然变化的PCB条件。最初,32.768水晶的交点角是为手表的最佳精度而设计的,而不是为现在使用的大多数应用而设计的。
传统32.768 kHz晶体的温度特性
原厂编码
生产厂家
型号
频率
频率稳定度
频率偏差
负载电容
工作温度
Q-SPT7P032762070FF
精工晶振
SSP-T7-F
32.768kHz
±20ppm
±20ppm
7pF
-40°C ~ 85°C
Q-SPT7P032761070FF
精工晶振
SSP-T7-F
32.768kHz
±10ppm
±10ppm
7pF
-40°C ~ 85°C
Q-SPT7P032760570FF
精工晶振
SSP-T7-F
32.768kHz
±5ppm
±5ppm
7pF
-40°C ~ 85°C
Q-SC32S03220C5AAE
精工晶振
SC-32S
32.768kHz
±20ppm
±20ppm
12.5pF
-40°C ~ 85°C
Q-SC32S03210C5AFE
精工晶振
SC-32S
32.768kHz
±10ppm
±10ppm
12.5pF
-40°C ~ 85°C
Q-SC32S03205C5ADE
精工晶振
SC-32S
32.768kHz
±5ppm
±5ppm
12.5pF
-40°C ~ 85°C
Q-SC32S0321060AAAF
精工晶振
SC-32S
32.768kHz
±10ppm
±10ppm
6PF
-40°C ~ 85°C
Q-SC32S0320570CADF
精工晶振
SC-32S
32.768kHz
±5ppm
±5ppm
7pF
-40°C ~ 85°C
Q-SC32S0321070CAAF
精工晶振
SC-32S
32.768kHz
±10ppm
±10ppm
7pF
-40°C ~ 85°C
Q-SC32S0322070AAAF
精工晶振
SC-32S
32.768kHz
±20ppm
±20ppm
7pF
-40°C ~ 85°C
Q-SC32S03220C5AAAF
精工晶振
SC-32S
32.768kHz
±20ppm
±20ppm
12.5pF
-40°C ~ 85°C
Q-SC32S03210C5AAFF
精工晶振
SC-32S
32.768kHz
±10ppm
±10ppm
12.5pF
-40°C ~ 85°C
Q-SC32S03205C5AADF
精工晶振
SC-32S
32.768kHz
±5ppm
±5ppm
12.5pF
-40°C ~ 85°C
Q-SC20S0322070CAAF
精工晶振
SC-32S
32.768kHz
±20ppm
±20ppm
7pF
-40°C ~ 85°C
Q-SC20S0321070CAFF
精工晶振
SC-32S
32.768kHz
±10ppm
±10ppm
7pF
-40°C ~ 85°C
Q-SC20S0320570CADF
精工晶振
SC-32S
32.768kHz
±5ppm
±5ppm
7pF
-40°C ~ 85°C
VT200F-6PF20PPM
精工晶振
VT-200-F
32.768kHz
±10ppm
±20ppm
6pF
-10°C ~ 60°C
VT200F-12.5PF20PPM
精工晶振
VT-200-F
32.768kHz
±10ppm
±20ppm
12.5pF
-10°C ~ 60°C
Q-SPT7P0327620C5GF
精工晶振
SSP-T7-F
32.768kHz
±20ppm
±20ppm
12.5pF
-40°C ~ 85°C
Q-SPT7P0327610C5GF
精工晶振
SSP-T7-F
32.768kHz
±10ppm
±10ppm
12.5pF
-40°C ~ 85°C
Q-SPT7P0327605C5GF
精工晶振
SSP-T7-F
32.768kHz
±5ppm
±5ppm
12.5pF
-40°C ~ 85°C
Q-SC16S03210C5AAAF
精工晶振
SC-16S
32.768kHz
±10ppm
±10ppm
12.5pF
-40°C ~ 85°C
Q-SC16S03205C5AAAF
精工晶振
SC-16S
32.768kHz
±5ppm
±5ppm
12.5pF
-40°C ~ 85°C
Q-SC16S0322070CAAF
精工晶振
SC-16S
32.768kHz
±20ppm
±20ppm
7pF
-40°C ~ 85°C
Q-SC16S0321070CAFF
精工晶振
SC-16S
32.768kHz
±10ppm
±10ppm
7pF
-40°C ~ 85°C
Q-SC16S0320570CADF
精工晶振
SC-16S
32.768kHz
±5ppm
±5ppm
7pF
-40°C ~ 85°C
Q-SC20S03220C5AAAF
精工晶振
SC-20S
32.768kHz
±20ppm
±20ppm
12.5pF
-40°C ~ 85°C
Q-SC20S03210C5AAAF
精工晶振
SC-20S
32.768kHz
±10ppm
±10ppm
12.5pF
-40°C ~ 85°C
Q-SC20S03205C5AAAF
精工晶振
SC-20S
32.768kHz
±5ppm
±5ppm
12.5pF
-40°C ~ 85°C
Q-SC20S0322070CAAF
精工晶振
SC-20S
32.768kHz
±20ppm
±20ppm
7pF
-40°C ~ 85°C
Q-SC20S0321070CAFF
精工晶振
SC-20S
32.768kHz
±10ppm
±10ppm
7pF
-40°C ~ 85°C
Q-SC20S0320570CADF
精工晶振
SC-20S
32.768kHz
±5ppm
±5ppm
7pF
-40°C ~ 85°C
Q-SPT2S0327620C5DJ
精工晶振
SSP-T2A-F
32.768kHz
±20ppm
±20ppm
12.5pF
-40°C ~ 85°C