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PCA9450 Arkusz danych(PDF) 60 Page - NXP Semiconductors

Numer części PCA9450
Szczegółowy opis  Power management IC for i.MX 8M application processor family
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NXP Semiconductors
PCA9450
Power management IC for i.MX 8M application processor family
PCA9450
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2019. All rights reserved.
Product data sheet
Rev. 1.0 — 19 November 2019
60 / 96
• Crystal's ESR (typically 30 kΩ to 100 kΩ)
• Tolerance (typically 5 ppm to 30 ppm)
All of these crystal parameters can usually be found in the crystal datasheet.
9.2.2.2 Effective load capacitance
The crystal oscillator (see Figure 24) uses two load capacitors, CL1 and CL2, as load
for the crystal. These capacitors generate, together with the crystal's inductance, the
required 180° phase shift of the feedback loop.
aaa-035750
XTAL_IN
180°
180°
XTAL_OUT
32.768 kHz
Xtal
CL2
CL2_P
CL1
CL1_P
Figure 24. Crystal oscillator
From the view of the crystal, these capacitors are a serial connection through GND.
Hence, if using two equal capacitors, the values of these capacitors must be twice the
required load capacitance. It is also important to consider PCB parasitic capacitances for
the calculation of the necessary capacitors according to Equation 5.
(5)
Where:
• C’L1 = CL1 + CL1_P, CL1_P is PCB parasitic capacitance.
• C’L2 = CL2 + CL2_P , CL2_P is PCB parasitic capacitance.
When using equal capacitors for CL1 and CL2 and a symmetric layout with equal parasitic
capacitance on both crystal pins, the effective load capacitance is shown in Equation 6.
(6)
Example:
Crystal requires 12 pF load.


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