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WM8986GECO/V Datasheet(PDF) 26 Page - Wolfson Microelectronics plc |
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WM8986GECO/V Datasheet(HTML) 26 Page - Wolfson Microelectronics plc |
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26 / 87 page  WM8986 Pre-Production w PP, Rev 3.1, February 2007 26 INPUT PGA VOLUME CONTROLS The input microphone PGAs have a gain range from -12dB to +35.25dB in 0.75dB steps. The gain from the LIN/RIN input to the PGA output is controlled by the register bits INPPGAVOLL[5:0] and INPPGABVOLR[5:0]. These register bits also affect the LIP pin when LIP2INPPGA=1 and the RIP pin when RIP2INPPGA=1. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 5:0 INPPGAVOLL 010000 (0dB) Left channel input PGA volume 000000 = -12dB 000001 = -11.25db . 010000 = 0dB . 111111 = +35.25dB 6 INPPGAMUTEL 0 Mute control for left channel input PGA: 0 = Input PGA not muted, normal operation 1 = Input PGA muted (and disconnected from the following input BOOST stage). 7 INPPGAZCL 0 Left channel input PGA zero cross enable: 0 = Update gain when gain register changes 1 = Update gain on 1st zero cross after gain register write. R45 (20h) Left channel input PGA volume control 8 INPPGAVU Not latched INPPGA left and INPPGA right volume do not update until a 1 is written to INPPGAVU (in reg 45 or 46) (See "Volume Updates" below) 5:0 INPPGAVOLR 010000 (0dB) Right channel input PGA volume 000000 = -12dB 000001 = -11.25db . 010000 = 0dB . 111111 = +35.25dB 6 INPPGAMUTER 0 Mute control for right channel input PGA: 0 = Input PGA not muted, normal operation 1 = Input PGA muted (and disconnected from the following input BOOST stage). 7 INPPGAZCR 0 Right channel input PGA zero cross enable: 0 = Update gain when gain register changes 1 = Update gain on 1st zero cross after gain register write. R46 (2Eh) Right channel input PGA volume control 8 INPPGAVU Not latched INPPGA left and INPPGA right volume do not update until a 1 is written to INPPGAVU (in reg 45 or 46) (See "Volume Updates" below) Table 6 Input PGA Volume Control |
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