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WM8944BECS/R 数据表(PDF) 56 Page - Cirrus Logic |
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WM8944BECS/R 数据表(HTML) 56 Page - Cirrus Logic |
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56 / 165 page  WM8944B 56 Rev 4.3 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 9 IN1_TO_PGA_AT TEN 0 IN1 to Speaker PGA Mixer attenuation 0 = 0dB 1 = -6dB attenuation 6 BYP_TO_PGA_A TTEN 0 Input PGA (ADC bypass) to Speaker PGA Mixer attenuation 0 = 0dB 1 = -6dB attenuation 3 DAC_TO_PGA_A TTEN 0 DAC to Speaker PGA Mixer attenuation 0 = 0dB 1 = -6dB attenuation 0 AUX_TO_PGA_A TTEN 0 AUX to Speaker PGA Mixer attenuation 0 = 0dB 1 = -6dB attenuation Table 33 Speaker PGA Mixer (MIXSPK) Control SPEAKER PGA VOLUME CONTROL The volume control of the Speaker PGA can be adjusted using the SPK_VOL register field as described in Table 34. The gain range is -57dB to +6dB in 1dB steps. Note that the output from the Speaker PGA Volume control is an input to the Speaker Output control described in the following section. To prevent "zipper noise", a zero-cross function is provided on the Speaker PGA. When this feature is enabled, volume updates will not take place until a zero-crossing is detected. Note that any dc offset in the DAC data should be less than the peak data to ensure there are zero- crossings. The Speaker PGA volume control register fields are described in Table 34. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R47 (2Fh) SPK volume ctrl 7 SPK_ZC 0 Speaker PGA Zero Cross Detector 0 = Change gain immediately 1 = Change gain on zero cross only 6 SPK_PGA_MUTE 1 Speaker PGA Mute 0 = Disable Mute 1 = Enable Mute 5:0 SPK_VOL [5:0] 11_1001 (0dB) Speaker PGA Volume 00_0000 = -57dB gain 00_0001 = -56dB … 11_1001 = 0dB ... 11_1111 = +6dB (See Table 35 for volume range) Table 34 Speaker PGA Volume Control |
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