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WM8904ECS/R 数据表(PDF) 76 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 76 Page - Wolfson Microelectronics plc |
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76 / 188 page  WM8904 Pre-Production w PP, Rev 3.3, September 2012 76 OUTPUT MUX CONTROL By default, the DAC outputs are routed directly to the respective output PGAs. A multiplexer (mux) is provided on each output path to select the BYPASSL or BYPASSR analogue signals from the Left/Right Input PGAs in place of the DAC outputs. The output multiplexers are configured using the register bits described in Table 44. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R61 (3Dh) Analogue OUT12 ZC 3 HPL_BYP_ENA 0 Selects input for left headphone output MUX 0 = Left DAC 1 = Left input PGA (Analogue bypass) 2 HPR_BYP_ENA 0 Selects input for right headphone output MUX 0 = Right DAC 1 = Right input PGA (Analogue bypass) 1 LINEOUTL_BYP_ ENA 0 Selects input for left line output MUX 0 = Left DAC 1 = Left input PGA (Analogue bypass) 0 LINEOUTR_BYP_ ENA 0 Selects input for right line output MUX 0 = Right DAC 1 = Right input PGA (Analogue bypass) Table 44 Output Mux Control OUTPUT VOLUME CONTROL Each analogue output can be independently controlled. The headphone output control fields are described in Table 45. The line output control fields are described in Table 46. The output pins are described in more detail in “Analogue Outputs”. The volume and mute status of each output can be controlled individually using the bit fields shown in Table 45 and Table 46. To prevent “zipper noise” when a volume adjustment is made, a zero-cross function is provided on all output paths. When this function is enabled, volume updates will not take place until a zero-crossing is detected. In the event of a long period without zero-crossings, a timeout will apply. The timeout must be enabled by setting the TOCLK_ENA bit, as defined in “Clocking and Sample Rates”. The volume update bits control the loading of the output driver volume data. For example, when HPOUT_VU is set to 0, the headphone volume data can be loaded into the respective control register, but will not actually change the gain setting. The Left and Right headphone volume settings are updated when a 1 is written to HPOUT_VU. This makes it possible to update the gain of a Left/Right pair of output paths simultaneously. |
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