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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8941 датащи(PDF) 21 Page - Wolfson Microelectronics plc |
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WM8941 датащи(HTML) 21 Page - Wolfson Microelectronics plc |
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21 / 96 page  Pre Production WM8941 w PP, Rev 3.3, December 2007 21 The input PGA is enabled by the IPPGAEN register bit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R2 Power Management 2 2 INPPGAEN 0 Input microphone PGA enable 0 = disabled 1 = enabled Table 3 Input PGA Enable Control INPUT PGA VOLUME CONTROL The input microphone PGA has a gain range from -12dB to +35.25dB in 0.75dB steps. The gain from the MICN input to the PGA output and from the AUX amplifier to the PGA output are always common and controlled by the register bits INPPGAVOL[5:0]. These register bits also affect the MICP pin when MICP2INPPGA=1. When the Automatic Level Control (ALC) is enabled the input PGA gain is then controlled automatically and the INPPGAVOL bits should not be used. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7 INPPGAZC 0 Input PGA zero cross enable: 0=Update gain when gain register changes 1=Update gain on 1st zero cross after gain register write. 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). R45 Input PGA volume control 5:0 INPPGAVOL 010000 Input PGA volume 000000 = -12dB 000001 = -11.25db . 010000 = 0dB . 111111 = 35.25dB R32 ALC control 1 8 ALCSEL 0 ALC function select: 0=ALC off (PGA gain set by INPPGAVOL register bits) 1=ALC on (ALC controls PGA gain) Table 4 Input PGA Volume Control |
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