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WM8904ECS/R 数据表(PDF) 64 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 64 Page - Wolfson Microelectronics plc |
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64 / 188 page  WM8904 Pre-Production w PP, Rev 3.3, September 2012 64 DAC INTERFACE VOLUME BOOST A digital gain function is available at the audio interface to boost the DAC volume when a small signal is received on DACDAT. This is controlled using register bits DAC_BOOST [1:0]. To prevent clipping at the DAC input, this function should not be used when the boosted DAC data is expected to be greater than 0dBFS. The digital interface volume is controlled as shown in Table 29. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R24 (18h) Audio Interface 0 10:9 DAC_BOOST [1:0] 00 DAC Input Volume Boost 00 = 0dB 01 = +6dB (Input data must not exceed -6dBFS) 10 = +12dB (Input data must not exceed -12dBFS) 11 = +18dB (Input data must not exceed -18dBFS) Table 29 DAC Interface Volume Boost DIGITAL SIDETONE A digital sidetone is available when ADCs and DACs are operating at the same sample rate. Digital data from either left or right ADC can be mixed with the audio interface data on the left and right DAC channels. Sidetone data is taken from the ADC high pass filter output, to reduce low frequency noise in the sidetone (e.g. wind noise or mechanical vibration). When using the digital sidetone, it is recommended that the ADCs are enabled before un-muting the DACs to prevent pop noise. The DAC volumes and sidetone volumes should be set to an appropriate level to avoid clipping at the DAC input. When digital sidetone is used, it is recommended that the Charge Pump operates in Register Control mode only (CP_DYN_PWR = 0). See “Charge Pump” for details. The digital sidetone is controlled as shown in Table 30. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R32 (20h) DAC Digital 0 11:8 ADCL_DAC_SVOL [3:0] 0000 Left Digital Sidetone Volume (See Table 31 for volume range) 7:4 ADCR_DAC_SVOL [3:0] 0000 Right Digital Sidetone Volume (See Table 31 for volume range) 3:2 ADC_TO_DACL [1:0] 00 Left DAC Digital Sidetone Source 00 = No sidetone 01 = Left ADC 10 = Right ADC 11 = Reserved 1:0 ADC_TO_DACR [1:0] 00 Right DAC Digital Sidetone Source 00 = No sidetone 01 = Left ADC 10 = Right ADC 11 = Reserved Table 30 Digital Sidetone Control |
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