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WM8976 数据表(PDF) 28 Page - Wolfson Microelectronics plc |
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WM8976 数据表(HTML) 28 Page - Wolfson Microelectronics plc |
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28 / 83 page  WM8976 Preliminary Technical Data w PTD Rev 2.0 February 2005 28 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 2:0 AUXL2BOOSTVOL 000 Controls the auxilliary amplifer to the input boost stage: 000=Path disabled (disconnected) 001=-12dB gain through boost stage 010=-9dB gain through boost stage … 111=+6dB gain through boost stage R47 Input BOOST control 6:4 L2_2BOOSTVOL 000 Controls the L2 pin to the input boost stage: 000=Path disabled (disconnected) 001=-12dB gain through boost stage 010=-9dB gain through boost stage … 111=+6dB gain through boost stage Table 9 Input BOOST Stage Control The BOOST stage is enabled under control of the BOOSTENL 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 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*AVDD and when MBVSEL=1, MICBIAS=0.6*AVDD. 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 * AVDD 1 = 0.6 * AVDD Table 12 Microphone Bias Voltage Control The internal MICBIAS circuitry is shown in Figure 13. Note that the maximum source current capability for MICBIAS is 3mA. The external biasing resistor therefore must be large enough to limit the MICBIAS current to 3mA. |
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