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參數(shù)資料
| 型號： | XWM8721EDS |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Internet Audio DAC with Integrated Headphone Driver |
| 中文描述： | 互聯(lián)網音頻DAC集成耳機驅動器 |
| 文件頁數(shù)： | 12/34頁 |
| 文件大?。?/td> | 347K |
| 代理商： | XWM8721EDS |
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WM8721
Product Preview
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 November 2000
12
VMID
LINEOUT
FROM DAC
TO HEADPHONE AMP
DACSEL
Figure 8 Line Output Schematic
The line output is muted by either muting the DAC (analogue) or Soft Muting (digital). Refer to the
DAC section for more details. Whenever the DAC is muted or the device placed into standby mode
the DC voltage is maintained at the line outputs to prevent any audible clicks from being present.
The software control for the line output is shown in Table 3.
REGISTER
ADDRESS
0000100
Analogue
Audio Path
Control
BIT
LABEL
DEFAULT
DESCRIPTION
4
DACSEL
0
DAC Select
1 = Select DAC
0 = Don
’
t select DAC
Table 3 Output Software Control
The recommended external components are shown in Figure 9.
AGND
R1
C1
AGND
LINEOUT
R2
Figure 9 Line Outputs Application Drawing
Recommended values are C1 = 470nF (10V npo type), R1 = 47KOhms, R2 = 100 Ohms
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 WM8721 has a stereo headphone output available on LHPOUT and RHPOUT. The output is
designed specifically for driving 16 or 32 ohm 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| XWM8721EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver |
| XWM8722EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| XWM8728EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
| XWM8728EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
| XWM8729ED | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC |
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