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WM8944BECS/R 数据表(PDF) 55 Page - Cirrus Logic |
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WM8944BECS/R 数据表(HTML) 55 Page - Cirrus Logic |
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55 / 165 page  WM8944B Rev 4.3 55 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0 AUX_TO_OUT_A TTEN 0 AUX to Line Output Mixer attenuation 0 = 0dB 1 = -6dB attenuation Table 32 Line Output Mixer (MIXOUT) Control SPEAKER PGA MIXER CONTROL The Speaker PGA mixer (MIXSPK) controls are described in Table 33. 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 Speaker PGA mixer. The output of the Speaker PGA mixer can be muted using the SPK_MIX_MUTE bit. Note that, when selecting the differential AUX/IN1 signal as an input to the Speaker PGA mixer, the IN1 pin provides the non-inverting path and the AUX pin provides the inverting signal path. Note that the output from the Speaker PGA mixer is also controlled by the Speaker PGA Volume control and the Speaker Output control described in the following sections. Care should be taken when enabling more than one path to the Speaker PGA 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_PGA_ATTEN controls the DAC and the Inverted DAC mixer paths to the Speaker PGA 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 R3 (03h) Power Management 1 4 SPK_MIX_MUTE 1 Speaker PGA Mixer Mute 0 = Disable Mute 1 = Enable Mute R43 (2Bh) SPK mixer control 1 10 AUXDIFF_TO_PG A 0 Differential AUX/IN1 to Speaker PGA Mixer select 0 = Disabled 1 = Enabled 9 IN1_TO_PGA 0 IN1 to Speaker PGA Mixer select 0 = Disabled 1 = Enabled 6 BYP_TO_PGA 0 Input PGA (ADC bypass) to Speaker PGA Mixer select 0 = Disabled 1 = Enabled 5 MDAC_TO_PGA 0 Inverted DAC to Speaker PGA Mixer select 0 = Disabled 1 = Enabled 3 DAC_TO_PGA 0 DAC to Speaker PGA Mixer select 0 = Disabled 1 = Enabled 0 AUX_TO_PGA 0 AUX to Speaker PGA Mixer select 0 = Disabled 1 = Enabled R45 (2Dh) SPK mixer control 3 10 AUXDIFF_TO_PG A_ATTEN 0 Differential AUX/IN1 to Speaker PGA Mixer attenuation 0 = 0dB 1 = -6dB attenuation |
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