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WM9090ECS/R 数据表(PDF) 23 Page - Wolfson Microelectronics plc |
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WM9090ECS/R 数据表(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 81 page ![]() Production Data WM9090 w PD, November 2010, Rev 4.1 23 HEADPHONE MIXER CONTROL The Headphone Mixer configuration registers are described in Table 8 for the Left Channel (MIXOUTL) and Table 9 for the Right Channel (MIXOUTR). A subset of the available input PGAs IN1A, IN1B, IN2A and IN2B is selectable as an input to each of the Headphone Mixers, as illustrated in Figure 3. Care should be taken when enabling more than one path to a Headphone Mixer in order to avoid clipping. The gain of each input path is adjustable using a selectable volume control in each path to facilitate this. The Headphone Mixer outputs can be muted or enabled using the MIXOUTL_MUTE and MIXOUTR_MUTE register bits. The Headphone Mixer volume is also controlled by the Headphone Output PGAs, as defined in Table 10. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R45 (2Dh) Output Mixer1 6 IN1A_TO_MIXOUTL 0 IN1A to MIXOUTL enable 0 = Disabled 1 = Enabled 2 IN2A_TO_MIXOUTL 0 IN2A to MIXOUTL enable 0 = Disabled 1 = Enabled R47 (2Fh) Output Mixer3 8 MIXOUTL_MUTE 1 MIXOUTL Output mute 0 = Un-Mute 1 = Mute 7:6 IN1A_MIXOUTL_VOL [1:0] 00 IN1A to MIXOUTL volume control 00 = 0dB 01 = -6dB 10 = -9dB 11 = -12dB 3:2 IN2A_MIXOUTL_VOL [1:0] 00 IN2A to MIXOUTL volume control 00 = 0dB 01 = -6dB 10 = -9dB 11 = -12dB Table 8 Left Output Mixer (MIXOUTL) Control REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R46 (2Eh) Output Mixer2 6 IN1A_TO_MIXOUTR 0 IN1A to MIXOUTR enable 0 = Disabled 1 = Enabled 4 IN1B_TO_MIXOUTR 0 IN1B to MIXOUTR enable 0 = Disabled 1 = Enabled 2 IN2A_TO_MIXOUTR 0 IN2A to MIXOUTR enable 0 = Disabled 1 = Enabled 0 IN2B_TO_MIXOUTR 0 IN2B to MIXOUTR enable 0 = Disabled 1 = Enabled R48 (30h) Output Mixer4 8 MIXOUTR_MUTE 1 MIXOUTR Output mute 0 = Un-Mute 1 = Mute |
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