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WM8731SEDS/RV bảng dữ liệu(PDF) 29 Page - Wolfson Microelectronics plc

tên linh kiện WM8731SEDS/RV
Giải thích chi tiết về linh kiện  Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
PDF  65 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8731SEDS/RV bảng dữ liệu(HTML) 29 Page - Wolfson Microelectronics plc

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WM8731 / WM8731L
Production Data
w
PD, Rev 4.9, October 2012
29
The software control for the line outputs is shown in Table 8.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0000100
Analogue
Audio Path
Control
3
BYPASS
1
Bypass Switch
1 = Enable Bypass
0 = Disable Bypass
4
DACSEL
0
DAC Select
1 = Select DAC
0 = Don’t select DAC
5
SIDETONE
0
Side Tone Switch
1 = Enable SideTone
0 = Disable Side Tone
Table 8 Output Software Control
The recommended external components are shown in Figure 20.
AGND
R1
C1
AGND
LINEOUT
R2
Figure 20 Line Outputs Application Drawing
Recommended values are C1 = 10
F, R1 = 47k, R2 = 100 Ω.
C1 forms a DC blocking capacitor to the line outputs. R1 prevents the output voltage from drifting so
protecting equipment connected to the line output. R2 forms a de-coupling resistor preventing
abnormal loads from disturbing the device. Note that poor choice of dielectric material for C1 can
have dramatic effects on the measured signal distortion at the output
HEADPHONE AMPLIFIER
The WM8731/L has a stereo headphone output available on LHPOUT and RHPOUT. The output is
designed specifically for driving 16 or 32 Ω headphones with maximum efficiency and low power
consumption. The headphone output includes a high quality volume level adjustment and mute
function.



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