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WM8731 bảng dữ liệu(PDF) 28 Page - Wolfson Microelectronics plc

tên linh kiện WM8731
Giải thích chi tiết về linh kiện  Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates
PDF  56 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8731 bảng dữ liệu(HTML) 28 Page - Wolfson Microelectronics plc

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WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
28
The recommended external components required to complete the application are shown in Figure 21.
AGND
R1
C1
AGND
HPOUT
Figure 21 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 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 22.
12.5K
VMID
LINEIN
VMID
HPOUT
VMID
FROM
LINE
INPUTS
LINEOUT
FROM
DAC
BYPASS (ON)
DACSEL (OFF)
SIDETONE (OFF)
Figure 22 Signal Routing in Bypass Mode



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