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SI4742 Fiches technique(PDF) 5 Page - Silicon Laboratories

No de pièce SI4742
Description  Si474X ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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AN400
Rev. 0.5
5
R11 (25
to 2 k) is a required series termination resistor when using digital audio output (Si4741/43/45 only) and
is used to mitigate noise from the digital frame clock routed to DFS pin 18. The recommended value of the resistor
is 1.4 k
 for optimal edge rate and noise suppression. Confirm that timing requirements are met with the selected
series termination resistor value. Place R11 as close to the host controller as possible.
R22 and R23 (4.02 k
) are optional pull-up and pull-down resistors for the RCLK line to reduce the energy in
harmonics of RCLK that might fall in the AM band. The recommended value is chosen such that RCLK will still
meet the voltage requirements of Si474x. Place R22 and R23 as close as possible to RCLK pin 11. If the RCLK
frequency is higher than the maximum frequency in the AM band, this will eliminate harmonics of RCLK that fall in
the AM band. Refer to “AN332: Si47xx Programming Guide” and “AN344: Si4706/07/4x Programming Guide” for
recommended RCLK and prescalar values.
R2 (24.3 k
) and R13 (4.53 k) are optional pull-up and pull-down resistors for the DFS line when using digital
audio output (Si4741/43/45 only.) They are used to reduce the energy in harmonics of DFS that might fall in the AM
band. The recommended value is chosen such that DFS will still meet the voltage and timing requirements of I2S.
Place R2 and R13 as close as possible to DFS pin 18.
2.2. Si474x 4x4 mm Schematic
Figure 1. Si474x 4x4 mm QFN Schematic


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