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WM8753L 数据表(PDF) 26 Page - Wolfson Microelectronics plc |
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WM8753L 数据表(HTML) 26 Page - Wolfson Microelectronics plc |
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26 / 87 page  Advanced Information WM8753L w AI Rev 3.1 June 2004 26 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R2 (02h) ADC control [6:5] ADCPOL[1:0] 00 00 = Polarity not inverted 01 = L polarity invert 10 = R polarity invert 11 = L and R polarity invert Table 11 ADC Polarity Control SINGLE ENDED OPERATION It is possible to connect up to three microphones single endedly. Microphone1 is connected to the MIC1 input , microphone2 to the MIC2 input, microphone3 to the MIC2N input and MIC1N is connected to Vref. The gains, MIC1BOOST and MIC2BOOST, should be set to be identical and micamp2 must be disabled. Any of the three microphones can then be selected as the output from micamp1 using MICSEL. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R51 (33h) Mic Select [7:6] MICSEL[1:0] 00 Microphone selected 00 : MIC1 01 : MIC2 10 : MIC3 11 : unused Table 12 MIC Select Control MICROPHONE BIASING CIRCUIT The MICBIAS output provides a low noise reference voltage suitable for biasing electret type microphones and the associated external resistor biasing network. Refer to the Applications Information section for recommended external components. The MICBIAS voltage can be altered via the MBVSEL register bit. When MBVSEL=0, MICBIAS=0.9*AVDD and when MBVSEL=1, MICBIAS=0.75*AVDD. The output can be enabled or disabled using the MICB control bit (see also the “Power Management” section). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R20 (14h) Power Management (1) 5 MICB 0 Microphone Bias Enable 0 = OFF (high impedance output) 1 = ON Table 13 Microphone Bias Control REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R51 (33h) Mic bias comp control 8 MBVSEL 0 Microphone Bias Voltage Control 0 = 0.9 * AVDD 1 = 0.75 * AVDD Table 14 Microphone Bias Voltage Control The internal MICBIAS circuitry is shown in Figure 8. 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. |
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