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WM8944BECS/R 数据表(PDF) 28 Page - Cirrus Logic |
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WM8944BECS/R 数据表(HTML) 28 Page - Cirrus Logic |
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28 / 165 page  WM8944B 28 Rev 4.3 ADC VOLUME CONTROL The output of the ADC (or digital microphone interface) can be digitally amplified or attenuated over a range from -71.625dB to +23.625dB in 0.375dB steps. The volume of each channel is controlled using ADCL_VOL or ADCR_VOL. The ADC Volume is part of the ADC Digital Filters block. The gain for a given eight-bit code X is given by: 0.375 (X-192) dB for 1 X 255; MUTE for X = 0 The ADC_VU bit controls the loading of digital volume control data. When ADC_VU is set to 0, the ADCL_VOL or ADCR_VOL control data is loaded into the respective control register, but does not actually change the digital gain setting. Both left and right gain settings are updated when a 1 is written to ADC_VU. This makes it possible to update the gain of both channels simultaneously. The output of the ADC or digital microphone (DMIC) interface can be digitally muted using the ADCL_MUTE or ADCR_MUTE bits. Both channels are muted simultaneously when the ADC_MUTEALL bit is set. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R25 (19h) ADC Control 1 8 ADC_MUTEALL 1 ADC Digital Mute for All Channels 0 = Disable Mute 1 = Enable Mute on all channels R27 (1Bh) ADC Digital Vol 12 ADC_VU 0 ADC Volume Update Writing a 1 to this bit will cause Left and Right ADC / DMIC volume to be updated simultaneously 8 ADCL_MUTE 0 ADC / Left DMIC Digital Mute 0 = Disable Mute 1 = Enable Mute 7:0 ADCL_VOL [7:0] 1100_0000 (0dB) ADC / Left DMIC Digital Volume 0000_0000 = mute 0000_0001 = -71.625dB 0000_0010 = -71.250dB … 1100_0000 = 0dB ... 1111_1111 = +23.625dB (See Table 9 for volume range) R28 (1Ch) Right ADC Digital Vol 12 ADC_VU 0 ADC Volume Update Writing a 1 to this bit will cause Left and Right ADC / Digital Mic volume to be updated simultaneously 8 ADCR_MUTE 0 Right DMIC Digital Mute 0 = Disable Mute 1 = Enable Mute 7:0 ADCR_VOL [7:0] 1100_0000 Right DMIC Digital Volume 0000_0000 = mute 0000_0001 = -71.625dB 0000_0010 = -71.250dB … 1100_0000 = 0dB ... 1111_1111 = +23.625dB (See Table 9 for volume range) Table 8 ADC Digital Volume Control |
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