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WM8940GEFL/V 数据表(PDF) 21 Page - Wolfson Microelectronics plc |
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WM8940GEFL/V 数据表(HTML) 21 Page - Wolfson Microelectronics plc |
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21 / 85 page  Pre-Production WM8940 w Pre-Production, Rev 3.0, February 2007 21 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R45 Input PGA gain control 6 INPPGAMUTE 1 Mute control for input PGA: 0=Input PGA not muted, normal operation 1=Input PGA muted (and disconnected from the following input BOOST stage). R47 Input BOOST control 8 PGABOOST 0 0 = PGA output has +0dB gain through input BOOST stage. 1 = PGA output has +20dB gain through input BOOST stage. Table 6 Input BOOST Stage Control The Auxiliary amplifier path to the BOOST stage is controlled by the AUX2BOOSTVOL[2:0] register bits. When AUX2BOOSTVOL=000 this path is completely disconnected from the BOOST stage. Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB. The MICP path to the BOOST stage is controlled by the MICP2BOOSTVOL[2:0] register bits. When MICP2BOOSTVOL=000 this input pin is completely disconnected from the BOOST stage. Settings 001 through to 111 control the gain in 3dB steps from -12dB to +6dB. 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. |
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