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SI4785 数据表(PDF) 10 Page - Silicon Laboratories

部件名 SI4785
功能描述  Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

SI4785 数据表(HTML) 10 Page - Silicon Laboratories

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AN383
10
Rev. 0.8
2.4. Si47xx 3x3 mm Bill of Materials
The required bill of materials for Figure 1 is shown in Table 6.
The optional bill of materials for Figure 1 is shown in Table 7.
Table 6. Required Bill of Materials
Designator
Description
Note
C1
VD/VDD Supply bypass capacitor,
22 nF, 10%, Z5U/X7R
C3
VI0 Supply bypass capacitor,
100 nF, 10%, Z5U/X7R
For supply noise mitigation.
Optional for Si47xx rev C and earlier parts.
For Si47xx rev D parts, C3 is required.
R12
DOUT current limiting resistor, 604
For digital audio output
(Si4705/06/21/31/35/37/39/8x only)
R13
DCLK current limiting resistor, 25
–2 k
For digital audio
(Si4705/06/1x/2x/31/35/37/39/8x only)
R14
DFS current limiting resistor, 25
–2 k
For digital audio output
(Si4705/06/21/31/35/37/39/8x only)
R15
DFS current limiting resistor, 25
–2 k
For digital audio input (Si471x/2x only)
R16
DIN current limiting resistor, 25
–2 k
For digital audio input (Si471x/2x only)
U1
Silicon Laboratories Si47xx,
3x3 mm, 20 pin, QFN
Table 7. Optional Bill of Materials
Designator
Description
Note
C2
VA Supply bypass capacitor,
22 nF, 10%, Z5U/X7R
For supply noise mitigation (Si4702/03 only)
C6, C7
AC coupling capacitor,
0.39 µF, X7R/X5R
For analog audio input
(Si471x/2x only)
C8, C9
AC coupling capacitor,
0.39 µF, X7R/X5R
For analog audio output
C10, C11
Crystal load capacitor, 22 pF, 5%, C0G
For internal oscillator option
C12, C13
Noise mitigation capacitor
2.2 pF, C0G
For DFS noise mitigation purpose
R2–R6
Current limiting resistor, 25–2 k
For digital system noise mitigation
R7,R8
Pullup resistor, 4.7 k
For I2C bus mode communication
R1, R9, R10, R11,
R17, R18
0
 jumper
For universal layout design supporting all
Si47xx
X1
Crystal, Epson FC-135
For internal oscillator feature


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