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SI52146-A01AGMR Folha de dados(PDF) 7 Page - Silicon Laboratories

Nome de Peças SI52146-A01AGMR
Descrição Electrónicos  PCI-EXPRESS GEN 1, GEN 2, & GEN 3 SIX OUTPUT CLOCK GENERATOR
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Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
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Si52146
Preliminary Rev. 0.1
7
2. Functional Description
2.1. Crystal Recommendations
The clock device requires a parallel resonance crystal. Substituting a series resonance crystal causes the clock
device to operate at the wrong frequency and violates the ppm specification. For most applications there is a
300 ppm frequency shift between series and parallel crystals due to incorrect loading.
2.1.1. Crystal Loading
Crystal loading plays a critical role in achieving low ppm performance. To realize low ppm performance, use the
total capacitance the crystal sees to calculate the appropriate capacitive loading (CL).
Figure 1 shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors
are in series with the crystal. It is not true that load capacitors are in parallel with the crystal and are approximately
equal to the load capacitance of the crystal.
Figure 1. Crystal Capacitive Clarification
2.1.2. 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 side 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
Table 4. Crystal Recommendations
Frequency
(Fund)
Cut
Loading
Load Cap
Shunt
Cap (max)
Motional
(max)
Tolerance
(max)
Stability
(max)
Aging
(max)
25 MHz
AT
Parallel
12–15 pF
5 pF
0.016 pF
35 ppm
30 ppm
5 ppm


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