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AN4630 bảng dữ liệu(PDF) 14 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) 14 Page - STMicroelectronics

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Two or multi-layer application boards
AN4630
3
Two or multi-layer application boards
Two or multi-layers application boards
Different approach has to be taken when an application board is designed using the
QFN32 or the WLCSP34 package.
3.1
QFN32 package
In this case the best solution is to use a two-layer application board.
Figure 9: QFN32 package application board stack-up layer
The two layers have to be so distributed:
1.
TOP layer: used for routing.
2.
BOTTOM layer: used for grounding under the RF zones and for routing on the rest.
3.2
WLCSP34 package
In this case, it is not possible to design a two layers board and the stack-up layer is a
multilayer one due to the complexity of the package. In Figure 10: "WLCSP34 package
application board stack-up layer " the suggested stack-up layer.
Figure 10: WLCSP34 package application board stack-up layer
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DocID027262 Rev 1



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