List of figures

AN4630

List of figures

Figure 1: QFN32 package, SMD discrete balun, DC-DC converter ON.....................................................5

Figure 2: QFN32 package, SMD discrete balun, DC-DC converter OFF...................................................6

Figure 3: QFN32 package, integrated balun, DC-DC converter ON ..........................................................6

Figure 4: CSP34 package, SMD discrete balun, DC-DC converter ON.....................................................7

Figure 5: CSP34 package, SMD discrete balun, DC-DC converter OFF ...................................................7

Figure 6: CSP34 package, integrated balun, DC-DC converter ON ..........................................................8

Figure 7: Capacitor equivalent circuit .......................................................................................................10

Figure 8: Diagram of the BlueNRG amplitude regulated oscillator...........................................................12

Figure 9: QFN32 package application board stack-up layer ....................................................................14

Figure 10: WLCSP34 package application board stack-up layer .............................................................14

Figure 11: QFN32 package application board TOP layer.........................................................................16

Figure 12: Vias on the exposed pad of the QFN32 package....................................................................17

Figure 13: High-frequency crystal inductor ...............................................................................................18

Figure 14: Low-frequency crystal inductor and tracks ..............................................................................19

Figure 15: DC-DC converter layout zone..................................................................................................20

Figure 16: Discrete balun layout zone ......................................................................................................21

Figure 17: WLCSP34 four layers board....................................................................................................22

Figure 18: WLCSP34 ground connection (TOP layer view) .....................................................................23

Figure 19: WLCSP34 ground connection (INNER2 layer view) ...............................................................24

Figure 20: WLCSP34 ground connection (INNER3 layer view) ...............................................................25

Figure 21: Focus on power supply pins ....................................................................................................26

Figure 22: Focus on BlueNRG biasing pins..............................................................................................27

Figure 23: Other TOP layer constraints ....................................................................................................27

Figure 24: RF ground on the discrete balun application board ................................................................28

Figure 25: RF ground on the integrated balun application board .............................................................28

Figure 26: High-frequency crystal connection ..........................................................................................29

Figure 27: Low-frequency crystal connection ...........................................................................................30

Figure 28: DC-DC converter inductor connection.....................................................................................30

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