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參數(shù)資料
| 型號： | XWM8731EDS |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates |
| 中文描述： | 便攜式互聯(lián)網(wǎng)三極管編解碼器的耳機驅(qū)動器和可編程采樣率 |
| 文件頁數(shù)： | 29/56頁 |
| 文件大?。?/td> | 595K |
| 代理商： | XWM8731EDS |
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WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
29
The bypass mode is selected under software control using the BYPASS microphone bit as shown in
Table 9. In true bypass mode, the output from the DAC (DACSEL) and (SIDETONE) should be de-
selected from the line output block. However this can also be used to sum the DAC output, Line
Inputs together and microphone inputs. The analogue line input and headphone output volume
controls and mutes are still operational in bypass mode. The 0dB gain setting is recommended for
the Line Input volume control to avoid distortion. The maximum signal at any point in the bypass path
must be no greater than 1.0V rms at AVDD = 3.3V, to avoid distortion. This amplitude tracks linearly
with AVDD. This means that if the DAC is producing a 1Vrms signal, and it is being summed with
1Vrms line BYPASS signal, the resulting LINEOP signal will be clipped.
REGISTER
ADDRESS
0000100
Analogue
Audio Path
Control
BIT
LABEL
DEFAULT
DESCRIPTION
3
BYPASS
1
Bypass Switch (Analogue)
1 = Enable Bypass
0 = Disable Bypass
Table 9 Bypass Mode Software Control
SIDETONE MODE
The WM8731 also includes a side tone mode where the microphone input is routed to line and
headphone outputs. The scheme for this is shown in Figure 23.
The side tone mode allows the microphone input to be attenuated to the outputs for telephone and
headset applications.
VMID
HPOUT
50k
10k
VMID
MICIN
VMID
10dB GAIN BOOST
VMID
FROM
LINE
INPUTS
LINEOUT
FROM
DAC
BYPASS (OFF)
DACSEL (OFF)
SIDETONE (ON)
Figure 23 Side Tone Mode Schematic
REGISTER
ADDRESS
0000100
Analogue
Audio Path
Control
BIT
LABEL
DEFAULT
DESCRIPTION
5
SIDETONE
0
Side Tone Switch (Analogue)
1 = Enable Side Tone
0 = Disable Side Tone
Side Tone Attenuation
11 = -15dB
10 = -12dB
01 = -9dB
00 = -6dB
7:6
SIDEATT[1:0]
00
Table 10 Side Tone Mode Table
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| XWM8733ED | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:102dB Stereo DAC |
| XWM8734EDS | 功能描述:接口—CODEC Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| XWM8734EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Stereo Audio CODEC |
| XWM8734EDS/RV | 功能描述:接口—CODEC Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| XWM8734EDS/V | 功能描述:接口—CODEC Stereo CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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