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WM8961 データシート(PDF) 39 Page - Wolfson Microelectronics plc |
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WM8961 データシート(HTML) 39 Page - Wolfson Microelectronics plc |
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39 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 39 DAC DE-EMPHASIS Digital de-emphasis can be applied to the DAC playback data (e.g. when the data comes from a CD with pre-emphasis used in the recording). De-emphasis filtering is available for sample rates of 48kHz, 44.1kHz and 32kHz. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R5 (05h) ADC and DAC Control (1) 2:1 DEEMPH [1:0] 00 De-Emphasis Control 11 = 48kHz sample rate 10 = 44.1kHz sample rate 01 = 32kHz sample rate 00 = No de-emphasis Table 21 DAC De-Emphasis Control DAC MONO MIX In normal operation, the left and right channel digital audio data is converted to analogue in two separate DACs. There is a mono-mix mode where the two audio channels are mixed together digitally and then converted to analogue using only one DAC (enabled DAC), while the other DAC must be disabled. Only one DAC must be enabled in order to use this function. A DAC digital mono-mix mode can be enabled using the DMONOMIX register bit. To prevent clipping, a -6dB attenuation is automatically applied to the mono mix. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R23 (17h) Additional Control (1) 4 DMONOMIX 0 DAC Mono Mix 0 = Stereo 1 = Mono (Mono mix output on enabled DAC) Table 22 DAC Mono Mix DAC OUTPUT PHASE The DAC output defaults to be non-inverted. Setting DACPOL[0] bit will invert the left DAC output phase and setting DACPOL[1] bit will invert the right DAC output phase. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R6 (06h) ADC and DAC Control (2) 6:5 DACPOL[1:0] 00 DAC Data invert 00 : Both Channels normal polarity 01 : Left Channel Inverted 10 : Right Channel Inverted 11 : Both Channels Inverted Table 23 DAC Phase Invert Select DAC SLOPING STOP-BAND FILTER Two DAC filter types are available, selected by the register bit DACSLOPE. When operating at lower sample rates (e.g. during voice communication) it is recommended that the sloping stop-band filter type is selected (DACSLOPE =1) to reduce out-of-band noise which can be audible at low DAC sample rates. See "Digital Filter Characteristics" section for details of DAC filters characteristics. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R6 (06h) ADC & DAC Control 2 1 DACSLOPE 0 Selects DAC filter characteristics 0 = Normal mode 1 = Sloping stop-band mode Table 24 DAC Sloping Stop-band Filter |
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