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WM8944BECS/R 数据表(PDF) 54 Page - Cirrus Logic |
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WM8944BECS/R 数据表(HTML) 54 Page - Cirrus Logic |
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54 / 165 page  WM8944B 54 Rev 4.3 LINE OUTPUT MIXER CONTROL The Line Output mixer (OUTMIX) controls are described in Table 32. These allow any of the DAC, Inverted DAC, IN1, AUX and ADC Bypass signals to be mixed. A differential AUX/IN1 signal can also be selected in the Line Output mixer. The output of the mixer can be muted using the LINE_MUTE bit. Note that, when selecting the differential AUX/IN1 signal as an input to the Line Output mixer, the IN1 pin provides the non-inverting path and the AUX pin provides the inverting signal path. Care should be taken when mixing more than one path to the Line Output mixer in order to avoid clipping. The gain of each input path is adjustable using a selectable -6dB control in each path to facilitate this. Note that the attenuation control field DAC_TO_OUT_ATTEN controls the DAC and the Inverted DAC mixer paths to the Line Output mixer. Note that the DAC input level may also be controlled by the DAC digital volume control - see “Digital to Analogue Converter (DAC)” for further details. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R42 (2Ah) Output ctrl 8 LINE_MUTE 1 LINEOUT Output Mute 0 = Disable Mute 1 = Enable Mute R49 (31h) Line mixer control 1 10 AUXDIFF_TO_O UT 0 Differential AUX/IN1 to Line Output Mixer select 0 = Disabled 1 = Enabled 9 IN1_TO_OUT 0 IN1 to Line Output Mixer select 0 = Disabled 1 = Enabled 6 BYP_TO_OUT 0 Input PGA (ADC bypass) to Line Output Mixer select 0 = Disabled 1 = Enabled 5 MDAC_TO_OUT 0 Inverted DAC to Line Output Mixer select 0 = Disabled 1 = Enabled 3 DAC_TO_OUT 0 DAC to Line Output Mixer select 0 = Disabled 1 = Enabled 0 AUX_TO_OUT 0 AUX to Line Output Mixer select 0 = Disabled 1 = Enabled R51 (33h) Line mixer control 2 10 AUXDIFF_TO_O UT_ATTEN 0 Differential AUX/IN1 to Line Output Mixer attenuation 0 = 0dB 1 = -6dB attenuation 9 IN1_TO_OUT_AT TEN 0 IN1 to Line Output Mixer attenuation 0 = 0dB 1 = -6dB attenuation 6 BYP_TO_OUT_A TTEN 0 Input PGA (ADC bypass) to Line Output Mixer attenuation 0 = 0dB 1 = -6dB attenuation 3 DAC_TO_OUT_A TTEN 0 DAC to Line Output Mixer attenuation 0 = 0dB 1 = -6dB attenuation |
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