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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM9713 датащи(PDF) 43 Page - Wolfson Microelectronics plc |
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WM9713 датащи(HTML) 43 Page - Wolfson Microelectronics plc |
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43 / 111 page  Preliminary Technical Data WM9713L 1 PTD, March 2004, Rev 2.2 43 SINGLE MIC OPERATION Up to three microphones can be connected in a single-ended configuration. Any one of the three MICs can be selected as the input to MPA using MPASEL[1:0] (Register 22h, bits 13:12). Only the microphone on MIC2B can be selected to MPB. Note that MPABST always sets the gain for the selected MPA input microphone. If MIC2B is the selected input for MPA it is recommended that MPB is disabled. DUAL MIC OPERATION Up to two microphones can be connected in a dual differential configuration. This is suitable for stereo microphone or noise cancellation applications. Mic1 is connected between the MIC2A and MICCM inputs and mic2 is connected between the MIC2B and MICCM inputs as shown in Figure 13. Additionally, another microphone can be supported on MIC1 selected through the MPA input mux. Note that the microphones can be connected in a single-ended configuration. Figure 13 Dual Microphone Configuration 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 MBVOL in register 22h. When MBVOL=0, MICBIAS=0.9*AVDD and when MBVOL=1, MICBIAS=0.75*AVDD. |
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