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WM8510GEDS/V 데이터시트(PDF) 17 Page - Wolfson Microelectronics plc |
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WM8510GEDS/V 데이터시트(HTML) 17 Page - Wolfson Microelectronics plc |
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17 / 56 page ![]() Product Preview WM8510 w PP Rev 1.2 December 2004 17 In mixer mode (MIC2MODE=1) the on-chip input resistor is bypassed, this allows the user to sum in multiple inputs with the use of external resistors. When used in this mode there will be gain variations through this path from part to part due to the variation of the internal 20kΩ resistors relative to the higher tolerance external resistors. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 6 MIC2EN 0 MIC2 input buffer enable 0 = OFF 1 = ON R44 Input control 3 MIC2MODE 0 0 = inverting buffer 1 = mixer (on-chip input resistor bypassed) Table 2 MIC2 Input Buffer Control INPUT BOOST The input BOOST circuit has 3 selectable inputs: the input microphone PGA output, the MIC2 amplifier output and the MICP input pin (when not using a differential microphone configuration). These three inputs can be mixed together and have individual gain boost/adjust as shown in Figure 8. Figure 8 Input Boost Stage The input PGA path can have a +20dB boost (PGABOOST=1) a 0dB pass through (PGABOOST=0) or be completely isolated from the input boost circuit (INPPGAMUTE=1). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R45 Input PGA gain control 6 INPPGAMUTE 0 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 1 0 = PGA output has +0dB gain through input BOOST stage. 1 = PGA output has +20dB gain through input BOOST stage. Table 3 Input BOOST Stage Control The MIC2 amplifier path to the BOOST stage is controlled by the MIC2_2BOOSTVOL[2:0] register bits. When MIC2_2BOOSTVOL=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. |
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