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WM8904ECS/R 数据表(PDF) 69 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 69 Page - Wolfson Microelectronics plc |
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69 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 69 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R33 (21h) DAC Digital 1 10 DAC_MUTERA TE 0 DAC Soft Mute Ramp Rate 0 = Fast ramp (fs/2, maximum ramp time is 10.7ms at fs=48k) 1 = Slow ramp (fs/32, maximum ramp time is 171ms at fs=48k) 9 DAC_UNMUTE _RAMP 0 DAC Soft Mute Mode 0 = Disabling soft-mute (DAC_MUTE=0) will cause the DAC volume to change immediately to DACL_VOL and DACR_VOL settings 1 = Disabling soft-mute (DAC_MUTE=0) will cause the DAC volume to ramp up gradually to the DACL_VOL and DACR_VOL settings 3 DAC_MUTE 1 DAC Soft Mute Control 0 = DAC Un-mute 1 = DAC Mute Table 35 DAC Soft-Mute Control DAC MONO MIX A DAC digital mono-mix mode can be enabled using the DAC_MONO register bit. This mono mix will be output on whichever DAC is enabled. To prevent clipping, a -6dB attenuation is automatically applied to the mono mix. The mono mix is only supported when one or other DAC is disabled. When the mono mix is selected, then the mono mix is output on the enabled DAC only; there is no output from the disabled DAC. If DACL_ENA and DACR_ENA are both set, then stereo operation applies. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R33 (21h) DAC Digital 1 12 DAC_MONO 0 DAC Mono Mix 0 = Stereo 1 = Mono (Mono mix output on enabled DAC) Table 36 DAC Mono Mix 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. See “Digital Filter Characteristics” for details of de-emphasis filter characteristics. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R33 (21h) DAC Digital 1 2:1 DEEMPH [1:0] 00 DAC De-Emphasis Control 00 = No de-emphasis 01 = 32kHz sample rate 10 = 44.1kHz sample rate 11 = 48kHz sample rate Table 37 DAC De-Emphasis Control |
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