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SI52111-A2 Folha de dados(PDF) 8 Page - Silicon Laboratories

Nome de Peças SI52111-A2
Descrição Electrónicos  PCI-EXPRESS GEN 1 SINGLE OUTPUT CLOCK GENERATOR
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Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
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SI52111-A2 Folha de dados(HTML) 8 Page - Silicon Laboratories

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Si52111 -A1/A2
8
Rev 1.2
2.2. Calculating Load Capacitors
In addition to the standard external trim capacitors, consider the trace capacitance and pin capacitance to calculate
the crystal loading correctly. Again, the capacitance on each side is in series with the crystal. The total capacitance
on both sides is twice the specified crystal load capacitance (CL). Trim capacitors are calculated to provide equal
capacitive loading on both sides.
Figure 2. Crystal Loading Example
Use the following formulas to calculate the trim capacitor values for Ce1 and Ce2.
Load Capacitance (each side)
Total Capacitance (as seen by the crystal)

CL: Crystal load capacitance

CLe: Actual loading seen by crystal using standard value trim capacitors

Ce: External trim capacitors

Cs: Stray capacitance (terraced)

Ci: Internal capacitance (lead frame, bond wires, etc.)
Ce
2 CL
Cs Ci
+

=
CLe
1
1
Ce1 Cs1 Ci1
++
---------------------------------------------
1
Ce2 Cs2 Ci2
++
---------------------------------------------
+


-------------------------------------------------------------------------------------------------------
=


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