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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8731 датащи(PDF) 22 Page - Wolfson Microelectronics plc |
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WM8731 датащи(HTML) 22 Page - Wolfson Microelectronics plc |
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22 / 56 page  WM8731 Advanced Information WOLFSON MICROELECTRONICS LTD AI Rev 2.0 February 2001 22 VMID MICBIAS AGND Figure 13 Microphone Bias Schematic ADC The WM8731 uses a multi-bit oversampled sigma-delta ADC. A single channel of the ADC is illustrated in the Figure 14. FROM MICROPHONE INPUT FROM LINE INPUT ANALOG INTEGRATOR INSEL MULTI BITS TO ADC DIGITAL FILTERS Figure 14 Multi-Bit Oversampling Sigma Delta ADC Schematic The use of multi-bit feedback and high oversampling rates reduces the effects of jitter and high frequency noise. The ADC Full Scale input is 1.0V rms at AVDD = 3.3 volts. Any voltage greater than full scale will possibly overload the ADC and cause distortion. Note that the full scale input tracks directly with AVDD. The device employs a pair of ADCs. The input can be selected from either the Line Inputs or the Microphone input under software control. The two channels cannot be selected independently. The control is shown in Table 4. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0000100 Analogue Audio Path Control 2 INSEL 0 Microphone/Line Input Select to ADC 1 = Microphone Input Select to ADC 0 = Line Input Select to ADC Table 4 ADC Software Control The digital data from the ADC is fed for signal processing to the ADC Filters. |
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