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WM8912GEFL/RV 参数 Datasheet PDF下载

WM8912GEFL/RV图片预览
型号: WM8912GEFL/RV
PDF下载: 下载PDF文件 查看货源
内容描述: 超低功耗DAC与耳机驱动器的便携式音频应用 [Ultra Low Power DAC with Headphone Driver for Portable Audio Applications]
分类和应用: 驱动器便携式
文件页数/大小: 128 页 / 1259 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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WM8912  
Production Data  
DAC SLOPING STOPBAND FILTER  
Two DAC filter types are available, selected by the register bit DAC_SB_FILT. When operating at  
lower sample rates (e.g. during voice communication) it is recommended that the sloping stopband  
filter type is selected (DAC_SB_FILT=1) to reduce out-of-band noise which can be audible at low  
DAC sample rates. See “Digital Filter Characteristics” for details of DAC filter characteristics.  
REGISTER  
ADDRESS  
BIT  
LABEL  
DEFAULT  
DESCRIPTION  
R33 (21h)  
DAC Digital 1  
11  
DAC_SB_FILT  
0
Selects DAC filter characteristics  
0 = Normal mode  
1 = Sloping stopband mode  
Table 21 DAC Sloping Stopband Filter  
DAC OVERSAMPLING RATIO (OSR)  
The DAC oversampling rate is programmable to allow power consumption versus audio performance  
trade-offs. The default oversampling rate is low for reduced power consumption; using the higher  
OSR setting improves the DAC signal-to-noise performance.  
REGISTER  
ADDRESS  
BIT  
LABEL  
DEFAULT  
DESCRIPTION  
R33 (21h)  
6
DAC_OSR128  
0
DAC Oversample Rate Select  
0 = Low power (normal OSR)  
1 = High performance (double OSR)  
DAC Digital 1  
Table 22 DAC Oversampling Control  
PD, Rev 4.0, September 2010  
36  
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