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AN4630 bảng dữ liệu(PDF) 19 Page - STMicroelectronics

tên linh kiện AN4630
Giải thích chi tiết về linh kiện  PCB design guidelines for the BlueNRG and BlueNRG-MS devices
PDF  33 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN4630 bảng dữ liệu(HTML) 19 Page - STMicroelectronics

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AN4630
Design recommendations when using QFN32
package
Figure 14: Low-frequency crystal inductor and tracks
The DC-DC converter area is very sensitive, and it is necessary to pay attention to the
layout of this part. This is because the DC-DC converter generates GND noise that can get
coupled on surrounding ground reducing the sensitivity, and high-frequency components
can be coupled onto RF part. So to ensure a correct layout it is necessary of: Providing
efficient filtering by placing capacitors as close as possible from the BlueNRG; Reducing
parasitic ensuring wide and short connections to BlueNRG. In Figure 15: "DC-DC converter
layout zone" the suggested layout is shown DC-DC converter inductor DC-DC converter
filtering capacitors
DocID027262 Rev 1
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