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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)： | 26/56頁 |
| 文件大小： | 595K |
| 代理商： | XWM8731EDS |
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WM8731
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 2.0 February 2001
26
AGND
R1
C1
AGND
LINEOUT
R2
Figure 19 Line Outputs Application Drawing
Recommended values are C1 = 10
μ
F, R1 = 47k, 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 WM8731 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.
The scheme of the circuit is shown in Figure 20.
VMID
HPOUT
FROM
DAC VIA
LINEOUT
Figure 20 Headphone Amplifier Schematic
LHPOUT and RHPOUT volumes can be independently adjusted under software control using the
LHPVOL[6:0] and RHPVOL[6:0] bits respectively of the headphone output control registers. The
adjustment is logarithmic with an 80dB range in 1dB steps from +6dB to
–
73dB.
The headphone outputs can be separately muted by writing codes less than 0110000 to
LHPVOL[6:0] or RHPVO[6:0]L bits. Whenever the headphone outputs are 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.
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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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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