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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8983 датащи(PDF) 39 Page - Cirrus Logic |
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WM8983 датащи(HTML) 39 Page - Cirrus Logic |
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39 / 129 page  WM8983 Rev 4.6 39 The BOOST stage is enabled under control of the BOOSTEN register bit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R2 Power management 2 4 BOOSTENL 0 Left channel Input BOOST enable 0 = Boost stage OFF 1 = Boost stage ON 5 BOOSTENR 0 Right channel Input BOOST enable 0 = Boost stage OFF 1 = Boost stage ON Table 10 Input BOOST Enable 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*AVDD1 and when MBVSEL=1, MICBIAS=0.65*AVDD1. The output can be enabled or disabled using the MICBEN control bit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 4 MICBEN 0 Microphone Bias Enable 0 = OFF (high impedance output) 1 = ON Table 11 Microphone Bias Enable Control REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R44 Input control 8 MBVSEL 0 Microphone Bias Voltage Control 0 = 0.9 * AVDD1 1 = 0.65 * AVDD1 Table 12 Microphone Bias Voltage Control The internal MICBIAS circuitry is shown in Figure 21. 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 21 Microphone Bias Schematic AGND1 MBVSEL=0 MICBIA SS = 1.8 x VMID = 0.9 X AVDD1 VMI D internal resistor internal resistor MICBE N MBVSEL=1 MICBIA S = 1.3 x VMID = 0.65 X AVDD1 |
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