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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8976CGEFL/V 데이터시트(PDF) 27 Page - Wolfson Microelectronics plc |
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WM8976CGEFL/V 데이터시트(HTML) 27 Page - Wolfson Microelectronics plc |
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27 / 114 page  Production Data WM8976 w PD, Rev 4.5, November 2011 27 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R47 Input BOOST control 2:0 AUXL2BOOSTVOL 000 Controls the auxiliary amplifier 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 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 8 Input BOOST Stage Control 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 Input BOOST enable 0 = Boost stage OFF 1 = Boost stage ON Table 9 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=0.65*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 10 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 = 0.65 * AVDD Table 11 Microphone Bias Voltage Control The internal MICBIAS circuitry is shown in Figure 16. 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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