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WM8941 Datasheet(PDF) 44 Page - Wolfson Microelectronics plc |
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WM8941 Datasheet(HTML) 44 Page - Wolfson Microelectronics plc |
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44 / 96 page  WM8941 Pre Production w PP, Rev 3.3, December 2007 44 HI-FI DIGITAL TO ANALOGUE CONVERTER (DAC) The DAC is enabled by the DACEN register bit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R3 Power Management 0 DACEN 0 DAC enable 0 = DAC disabled 1 = DAC enabled Table 30 DAC Enable The WM8941 also has a Soft Mute function, which gradually attenuates the volume of the digital signal to zero. When removed, the gain will step back up to the digital gain setting. This function is disabled by default. To play back an audio signal, it must first be disabled by setting the DACMU bit to zero. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R10 DAC Control 6 DACMU 0 DAC soft mute enable 0 = DACMU disabled 1 = DACMU enabled Table 31 DAC Control Register The digital audio data is converted to over sampled bit streams in the on-chip, true 24-bit digital interpolation filters. The bit stream data enters a multi-bit, sigma-delta DAC, which converts it to a high quality analogue audio signal. The multi-bit DAC architecture reduces high frequency noise and sensitivity to clock jitter. The DAC output defaults to non-inverted. Setting DACPOL will invert the DAC output phase. AUTOMUTE The DAC has an auto mute function which applies an analogue mute when 1024 consecutive zeros are detected. The mute is released as soon as a non-zero sample is detected. Auto mute can be enabled using the AMUTE control bit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R10 DAC Control 2 AMUTE 0 DAC auto mute enable 0 = auto mute disabled 1 = auto mute enabled Table 32 DAC Auto Mute Control Register |
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