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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8941 датащи(PDF) 25 Page - Wolfson Microelectronics plc |
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WM8941 датащи(HTML) 25 Page - Wolfson Microelectronics plc |
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25 / 96 page  Pre Production WM8941 w PP, Rev 3.3, December 2007 25 The internal MICBIAS circuitry is shown in Figure 9. Note that the maximum source current capability for MICBIAS is 3mA. The external biasing resistors therefore must be large enough to limit the MICBIAS current to 3mA. Figure 9 Microphone Bias Schematic ANALOGUE TO DIGITAL CONVERTER (ADC) The WM8941 uses a multi-bit, oversampled sigma-delta ADC channel. The use of multi-bit feedback and high oversampling rates reduces the effects of jitter and high frequency noise. The ADC Full Scale input level is proportional to AVDD. With a 3.3V supply voltage, the full scale level is 1.0Vrms. Any voltage greater than full scale may overload the ADC and cause distortion. ADC DIGITAL FILTERS The ADC filters perform true 24 bit signal processing to convert the raw multi-bit oversampled data from the ADC to the correct sampling frequency to be output on the digital audio interface. The digital filter path is illustrated in Figure 10. Figure 10 ADC Digital Filter Path AGND MBVSEL=0 MICBIAS = 1.8 x VMID = 0.9 X AVDD VMID internal resistor internal resistor MB MBVSEL=1 MICBIAS = 1.3 x VMID = 0.65 X AVDD |
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