AN4630 datasheet(23/33 Pages) STMICROELECTRONICS

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AN4630 Arkusz danych(PDF) 23 Page - STMicroelectronics

Numer części	AN4630

Szczegółowy opis	PCB design guidelines for the BlueNRG and BlueNRG-MS devices

PDF	33 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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23 / 33 page

AN4630

Design recommendations when using

WLCSP34 package

Figure 18: WLCSP34 ground connection (TOP layer view)

In the INNER2 layer, Figure 19: "WLCSP34 ground connection (INNER2 layer view)",

buried filled vias have to be used to connect INNER2 layer ground and INNER 3 layer

ground. The buried filled vias have to be put with 400 um of offset (both in x and y

directions) respect to laser vias.

In the INNER2 layer the GND_SMPS has to be kept separated from the GND.

It is necessary not put ground layer under the RF discrete balun. This is because due to the

very little distance between TOP and INNER2 layers; 80 um, the parasitic capacitances

would be too big and would not be possible to find a working solution of the matching

network.

DocID027262 Rev 1

23/33

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