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WM8904ECS/R 数据表(PDF) 150 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 150 Page - Wolfson Microelectronics plc |
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150 / 188 page  WM8904 Pre-Production w PP, Rev 3.3, September 2012 150 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION REFER TO R33 (21h) DAC Digital 1 12 DAC_MONO 0 DAC Mono Mix 0 = Stereo 1 = Mono (Mono mix output on enabled DAC) DAC Mono Mix 11 DAC_SB_FILT 0 Selects DAC filter characteristics 0 = Normal mode 1 = Sloping stopband mode (recommended when fs 24kHz DAC Sloping Stopband Filter 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) DAC Soft Mute and Soft Un-Mute 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 DAC Soft Mute and Soft Un-Mute 6 DAC_OSR128 0 DAC Oversample Rate Select 0 = Low power (normal OSR) 1 = High performance (double OSR) DAC Oversampling Ratio (OSR) 3 DAC_MUTE 1 DAC Soft Mute Control 0 = DAC Un-mute 1 = DAC Mute DAC Soft Mute and Soft Un-Mute 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 DAC De-Emphasis Register 21h DAC Digital 1 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION REFER TO R36 (24h) ADC Digital Volume Left 8 ADC_VU 0 ADC Volume Update Writing a 1 to this bit causes left and right ADC volume to be updated simultaneously Analogue-to-Digital Converter (ADC) 7:0 ADCL_VOL [7:0] 1100_0000 Left ADC Digital Volume 00h = Mute 01h = -71.625dB 02h = -71.250dB … (0.375dB steps) C0h = 0dB … (0.375dB steps) EFh to FFh = +17.625dB Analogue-to-Digital Converter (ADC) Register 24h ADC Digital Volume Left |
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