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WM8941 bảng dữ liệu(PDF) 24 Page - Wolfson Microelectronics plc |
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WM8941 bảng dữ liệu(HTML) 24 Page - Wolfson Microelectronics plc |
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24 / 96 page  WM8941 Pre Production w PP, Rev 3.3, December 2007 24 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:4 MICP2BOOSTVOL 000 Controls the MICP pin to the input boost stage (NB, when using this path set MICP2INPPGA=0): 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 2:0 AUX2BOOSTVOL 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 Table 7 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 BOOSTEN 0 Input BOOST enable 0 = Boost stage OFF 1 = Boost stage ON Table 8 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 9 Microphone Bias Enable 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 10 Microphone Bias Voltage Control |
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