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LC823450 Datasheet(PDF) 89 Page - ON Semiconductor |
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LC823450 Datasheet(HTML) 89 Page - ON Semiconductor |
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89 / 112 page  LC823450 www.onsemi.com 89 APPLICATION XTAL For Oscillation Figure 37. For Oscillation C2 C1 R2 R1 XIN XOUT Table 54. Symbol Value XT1 XIN1/XOUT1 XTRTC XIN32K/XOUT32K 20 MHz 48 MHz 32.768 KHz R1 1 M Ω 1 M Ω 10 M Ω R2 0 Ω 0 Ω 0 Ω C1 3 pF 3 pF 10 pF C2 3 pF 3 pF 10 pF 60. Optimize the circuit constant for each product when you use this oscillation cell and ask to the manufacturer of the crystal oscillator to investigate (matching investigation) because the best circuit constant changes depending on the specification of the crystal oscillator used and the ambient surrounding (parasitic capacitance etc. of an external substrate). 61. The values of parts are for reference. There is a possibility that the adjustment is needed according to the situation of the set. 62. The following may be needed as the anti−noise measures of oscillation circuit. − Be adjacent as much as possible, and shorten wiring between elements such as this LSI and the crystal oscillator. − GND of the oscillation circuit close to GND (VSS) of this LSI as much as possible. − Do not bring the wiring pattern of the large current drive close around the oscillation circuit. − Take wide pattern to avoid the effect of interference of other signals. |
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