ISL12022M Oscillator Accuracy
The ISL12022M devices are high-accuracy, temperature compensated Real Time Clock (RTC) modules that incorporate the RTC die and the quartz crystal. The RTC contains an internal temperature sensor and state machine to adjust the oscillator frequency and allow factory calibration to less than ±5ppm error over the -40°C to +85°C ambient operating temperature range. There are numerous items that affect the final accuracy of the module once assembled on a PC board, including handling and shock, reflow temperature profile, maximum temperature, number of reflows (or wave solder) and if ultrasound is used (note that the ISL12022M family refers to the ISL12022M, ISL12022MA and ISL12022MR5421 products).
This application note will discuss the expected accuracy of the device when mounted on a board, at room temperature and as temperature varies. Also discussed will be the measurement techniques and analyzing the results.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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October 17, 2014 |
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AN1744.0 |
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Application Note 1744 |
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181 KB |
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