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WM8731SEDS/V データシート(PDF) 32 Page - Wolfson Microelectronics plc

部品番号 WM8731SEDS/V
部品情報  Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
PDF  65 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8731SEDS/V データシート(HTML) 32 Page - Wolfson Microelectronics plc

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WM8731 / WM8731L
Production Data
w
PD, Rev 4.9, October 2012
32
The recommended external components required to complete the application are shown in Figure 22.
AGND
R1
C1
AGND
HPOUT
Figure 22 Headphone Output Application Drawing
Recommended values are C1 = 220uF (10V electrolytic), R1 = 47k
C1 forms a DC blocking capacitor to isolate the dc of the HPOUT from the headphones. R1 form a
pull down resistor to discharge C1 to prevent the voltage at the connection to the headphones from
rising to a level that may damage the headphones.
BYPASS MODE
The WM8731/L includes a bypass mode whereby analogue line inputs are routed directly to the
analogue line outputs and headphone outputs. The scheme for this is in Figure 23.
12.5K
VMID
LINEIN
VMID
HPOUT
VMID
FROM
LINE
INPUTS
LINEOUT
FROM
DAC
BYPASS (ON)
DACSEL (OFF)
SIDETONE (OFF)
Figure 23 Signal Routing in Bypass Mode



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