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WM8904ECS/R 数据表(PDF) 72 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 72 Page - Wolfson Microelectronics plc |
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72 / 188 page  WM8904 Pre-Production w PP, Rev 3.3, September 2012 72 OUTPUT SIGNAL PATHS ENABLE The output PGAs for each analogue output pin can be enabled and disabled using the register bits described in Table 40. Note that the Headphone Outputs and Line Outputs are also controlled by fields located within Register R90 and R94, which provide suppression of pops & clicks when enabling and disabling these signal paths. These registers are described in the following “Headphone / Line Output Signal Paths Enable” section. Under recommended usage conditions, all the control bits associated with enabling the Headphone Outputs and the Line Outputs will be configured by scheduling the default Start-Up and Shutdown sequences as described in the “Control Write Sequencer” section. In these cases, the user does not need to set the register fields in R14, R15, R90 and R94 directly. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R14 (0Eh) Power Management 2 1 HPL_PGA_ENA 0 Left Headphone Output Enable 0 = disabled 1 = enabled 0 HPR_PGA_ENA 0 Right Headphone Output Enable 0 = disabled 1 = enabled R15 (0Fh) Power Management 3 1 LINEOUTL_PGA_ ENA 0 Left Line Output Enable 0 = disabled 1 = enabled 0 LINEOUTR_PGA _ENA 0 Right Line Output Enable 0 = disabled 1 = enabled Table 40 Output Signal Paths Enable To enable the output PGAs and multiplexers, the reference voltage VMID and the bias current must also be enabled. See “Reference Voltages and Master Bias” for details of the associated controls VMID_RES and BIAS_ENA. HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE The output paths can be actively discharged to AGND through internal resistors if desired. This is desirable at start-up in order to achieve a known output stage condition prior to enabling the VMID reference voltage. This is also desirable in shutdown to prevent the external connections from being affected by the internal circuits. The ground-referenced Headphone outputs and Line outputs are shorted to AGND by default; the short circuit is removed on each of these paths by setting the applicable fields HPL_RMV_SHORT, HPR_RMV_SHORT, LINEOUTL_RMV_SHORT or LINEOUTR_RMV_SHORT. The ground-referenced Headphone output and Line output drivers are designed to suppress pops and clicks when enabled or disabled. However, it is necessary to control the drivers in accordance with a defined sequence in start-up and shutdown to achieve the pop suppression. It is also necessary to schedule the DC Servo offset correction at the appropriate point in the sequence (see “DC Servo”). Table 41 and Table 42 describe the recommended sequences for enabling and disabling these output drivers. |
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