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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8976CGEFL/V 데이터시트(PDF) 23 Page - Wolfson Microelectronics plc |
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WM8976CGEFL/V 데이터시트(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 114 page  Production Data WM8976 w PD, Rev 4.5, November 2011 23 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R44 Input Control 0 LIP2INPPGA 1 Connect LIP pin to input PGA amplifier positive terminal. 0 = LIP not connected to input PGA 1 = input PGA amplifier positive terminal connected to LIP (constant input impedance) 1 LIN2INPPGA 1 Connect LIN pin to input PGA negative terminal. 0=LIN not connected to input PGA 1=LIN connected to input PGA amplifier negative terminal. 2 L2_2INPPGA 0 Connect L2 pin to input PGA positive terminal. 0=L2 not connected to input PGA 1=L2 connected to input PGA amplifier positive terminal (constant input impedance). Table 5 Input PGA 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 LIN input to the PGA output and from the L2 amplifier to the PGA output is always common and controlled by the register bits INPPGAVOLL[5:0]. These register bits also affect the LIP pin when LIP2INPPGA=1, the L2 pin when L2_2INPPGA=1 and the L2 pin when L2_2INPPGA=1. When the Automatic Level Control (ALC) is enabled the input PGA gains are controlled automatically and the INPPGAVOLL bits should not be used. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R45 Input PGA volume control 5:0 INPPGAVOLL 010000 Input PGA volume 000000 = -12dB 000001 = -11.25db . 010000 = 0dB . 111111 = 35.25dB 6 INPPGAMUTEL 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). 7 INPPGAZCL 0 Input PGA zero cross enable: 0=Update gain when gain register changes 1=Update gain on 1 st zero cross after gain register write. 8 INPPGAUPDATE Not latched INPPGAVOLL volume does not update until a 1 is written to INPPGAUPDATE R32 ALC control 1 8 ALCSEL 0 ALC function select: 0=ALC off 1=ALC on Table 6 Input PGA Volume Control |
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