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SI4738 Scheda tecnica(PDF) 6 Page - Silicon Laboratories

Il numero della parte SI4738
Spiegazioni elettronici  Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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Produttore elettronici  SILABS [Silicon Laboratories]
Homepage  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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AN383
6
Rev. 0.8
Note:
Crystal and digital audio mode cannot be used at the same time. Populate R1 and remove C10, C11, and X1 when using
digital audio.
Populate C10, C11, and X1 and remove R1 when using the internal oscillator. Place resistor R1 as close to DCLK/
GPO3 pin 17 as possible as shown in Layout Example 4 to minimize trace length from pin 17 to the crystal and
load cap.
R2-R6 (25
–2 k) are optional series termination resistors and are used to mitigate system noise. The
recommended value of the resistors is 2 k
 for optimal edge rate and noise suppression. Confirm that timing
requirements are met with the selected series termination resistor value. Place the series termination resistors R2-
R6 as close to the host controller as possible.
R7 and R8 (4.7 k
) are optional pull-up resistors for the SCLK and SDIO lines required only when using an I2C
bus. The size of pull-up resistor value will vary based on the number of devices, capacitance and speed of the bus.
Placement location is not critical. Refer to the I2C specification for additional design information.
R9 (0
) is used to route power to VA/LIN/DFS supply pin 16. R9 is only required to support a layout for all 3x3 mm
QFN devices. If designing for the Si4702/03 only R9 may be replaced with trace connections. If designing for
Si4704/05/06/07/1x/2x/3x/8x only, R9 is not required. Place resistor R9 as close to VA/LIN/DFS pin 16 as possible.
R10 (0
) is an optional jumper used to route the VA pin 16 for Si4702/03. R10 is only required for a universal
design which supports BOM options for the Si4702/03 and other Si47xx devices. R10 should be populated when
using an Si4702/03 and not populated when using an alternate device.
R11 (0
) is an optional jumper used to route the DFS to VA/LIN/DFS pin 16. R11 is only required for a design in
which the Si4702/03 and digital audio output (Si4705/06/21/31/35/37/39/8x) BOM options are desired. Place
resistor R11 as close to pin VA/LIN/DFS 16 as possible.
R12 (25
–2 k) is a required series termination resistor when using digital audio output (Si4705/06/21/31/35/37/
39/8x) and is used to mitigate noise from the digital data routed from GND/RIN/DOUT pin 15. The recommended
value of the resistor is 604
 for optimal edge rate and noise suppression. Confirm that timing requirements are
met with the selected series termination resistor value. Place R12 as close to pin 15 as possible.
R13 (25
–2 k) is a required series termination resistor when using digital audio (Si4705/06/1x/2x/31/35/37/39/8x
only) and is used to mitigate noise from the digital clock routed to GPO3/DCLK pin 17. The recommended value of
the resistor is 2 k
 for optimal edge rate and noise suppression. Confirm that timing requirements are met with the
selected series termination resistor value. Place R13 as close to the host controller as possible.
R14 (25
–2 k) is a required series termination resistor when using digital audio output (Si4705/06/21/31/35/37/
39/8x) and is used to mitigate noise from the digital frame clock routed to VA/LIN/DFS pin 16. The recommended
value of the resistor is 2 k
 for optimal edge rate and noise suppression. Confirm that timing requirements are met
with the selected series termination resistor value. Place R14 as close to the host controller as possible.
R15 (25
–2 k) is a required series termination resistor when using digital audio input (Si471x/2x only) and is
used to mitigate noise from the digital frame clock routed to LOUT/DFS pin 14. The recommended value of the
resistor is 2 k
 for optimal edge rate and noise suppression. Confirm that timing requirements are met with the
selected series termination resistor value. Place R15 as close to the host controller as possible.
R16 (25
–2 k) is a required series termination resistor when using digital audio input (Si471x/2x only) and is
used to mitigate noise from the digital data routed to ROUT/DIN pin 13. The recommended value of the resistors is
2k
 for optimal edge rate and noise suppression. Confirm that timing requirements are met with the selected
series termination resistor value. Place R16 as close to the host controller as possible.
R17 (0
) is an optional jumper used to route the GND pin 15 for Si4702/03. R17 is only required for a universal
design which supports BOM options for the Si4702/03 and other Si47xx devices. R17 should be populated when
using an Si4702/03 and not populated when using an alternate device. Place R17 as close to the Si47xx as
possible.
R18 (0
) is an optional jumper used to route the GND pin 4 for Si4702/03. R18 is only required for a universal
design which supports BOM options for the Si4702/03 and other Si47xx devices. R18 should be populated when
using an Si4702/03 and not populated when using an alternate device. Place R18 as close to the Si47xx as
possible.


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