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SW52212 데이터시트(PDF) 20 Page - Silicon Laboratories

부품명 SW52212
상세설명  12/8/4/2-Output PCI-Express Gen 1/2/3/4/5 and SRIS Clock Generator
PDF  71 Pages
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제조업체  SILABS [Silicon Laboratories]
홈페이지  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SW52212 데이터시트(HTML) 20 Page - Silicon Laboratories

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5. Functional Description
5.1 Crystal Recommendations
The clock device requires a parallel resonance crystal.
Table 5.1. Crystal Recommendations
Frequency
(Fund)
Cut
Loading
Load Cap
Shunt Cap
(max)
Motional
(max)
Tolerance
(max)
Stability
(max)
Aging (max)
25 MHz
AT
Parallel
8–15 pF
5 pF
0.016 pF
35 ppm
30 ppm
5 ppm
5.2 Crystal Loading
Crystal loading is critical in achieving low ppm performance. To realize low ppm performance, use the total capacitance the crystal sees
to calculate the appropriate capacitive loading (CL).
The figure below shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors are in series
with the crystal.
Figure 5.1. Crystal Capacitive Clarification
Data Sheet
Functional Description
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