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AN2867 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Oscillator design guide for STM8S
PDF  41 Pages
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AN2867 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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AN2867
Guidelines for selecting suitable crystal and external components
40
Step 5 (optional): Calculate the PPM accuracy budget
Finally, you can use the formula below to estimate the PPM accuracy budget for the whole
application:
where:
PPMBudget is the estimated accuracy for the oscillation frequency.
PPMcrystal is the crystal PPM accuracy specified in the datasheet.
Deviation (CL) is expressed in pF. It measures the deviation of the load capacitance
(CL) due to tolerances on load capacitor values and the variation of the stray
capacitance (CS) due to PCB manufacturing process deviation.
Pullabilty is expressed in PPM/pF (refer to Section 3.7: Crystal pullability).
Note:
The PPM budget calculated above does not take into account the temperature variation
which may make the PPM budget bigger.
PPMBudget PPMcrystal Deviation CL
() Pullabilitycrystal
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