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WM8750JL 参数 Datasheet PDF下载

WM8750JL图片预览
型号: WM8750JL
PDF下载: 下载PDF文件 查看货源
内容描述: 立体声编解码器用于便携式音频应用 [Stereo CODEC for Portable Audio Applications]
分类和应用: 解码器编解码器便携式
文件页数/大小: 61 页 / 561 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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Production Data  
WM8750JL  
The signal inputs are biased internally to the reference voltage VREF. Whenever the line inputs are  
muted or the device placed into standby mode, the inputs are kept biased to VREF using special anti-  
thump circuitry. This reduces any audible clicks that may otherwise be heard when changing inputs.  
DC MEASUREMENT  
For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1  
and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and  
microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a  
signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The  
input range for dc measurement is AGND to AVDD.  
REGISTER  
ADDRESS  
BIT  
LABEL  
LINSEL  
DEFAULT  
DESCRIPTION  
R32 (20h)  
00  
Left Channel Input Select  
00 = LINPUT1  
7:6  
ADC Signal  
Path Control  
(Left)  
01 = LINPUT2  
10 = LINPUT3  
11 = L-R Differential (either LINPUT1-  
RINPUT1 or LINPUT2-RINPUT2,  
selected by DS)  
LMICBOOST  
RINSEL  
00  
00  
Left Channel Microphone Gain Boost  
00 = Boost off (bypassed)  
01 = 13dB boost  
5:4  
7:6  
10 = 20dB boost  
11 = 29dB boost  
R33 (21h)  
Right Channel Input Select  
00 = RINPUT1  
ADC Signal  
Path Control  
(Right)  
01 = RINPUT2  
10 = RINPUT3  
11 = L-R Differential (either LINPUT1-  
RINPUT1 or LINPUT2-RINPUT2,  
selected by DS)  
RMICBOOST  
00  
Right Channel Microphone Gain Boost  
00 = Boost off (bypassed)  
01 = 13dB boost  
5:4  
10 = 20dB boost  
11 = 29dB boost  
Table 3 Input Software Control  
REGISTER  
ADDRESS  
BIT  
LABEL  
RDCM  
DEFAULT  
DESCRIPTION  
R31 (1Fh)  
ADC input Mode  
0
Right Channel DC Measurement  
0 = Normal Operation, PGA Enabled  
1 = Measure DC level on RINPUT1  
Left Channel DC Measurement  
5
LDCM  
0
4
0 = Normal Operation, PGA Enabled  
1 = Measure DC level on LINPUT1  
Table 4 DC Measurement Select  
REGISTER  
ADDRESS  
BIT  
LABEL  
DEFAULT  
DESCRIPTION  
R31 (1Fh)  
ADC Input Mode  
DS  
0
Differential input select  
0: LINPUT1 – RINPUT1  
1: LINPUT2 – RINPUT2  
8
Table 5 Differential Input Select  
PD, April 2012, Rev 4.1  
17  
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