SI4785 datasheet(10/69 Pages) SILABS

부품명	SI4785

상세설명	Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES

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제조업체	SILABS [Silicon Laboratories]

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10 / 69 page

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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