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WM8731 Datasheet(PDF) 28 Page - Wolfson Microelectronics plc |
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WM8731 Datasheet(HTML) 28 Page - Wolfson Microelectronics plc |
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28 / 56 page  WM8731 Advanced Information WOLFSON MICROELECTRONICS LTD AI Rev 2.0 February 2001 28 The recommended external components required to complete the application are shown in Figure 21. AGND R1 C1 AGND HPOUT Figure 21 Headphone Output Application Drawing Recommended values are C1 = 220uF (10V electrolytic), R1 = 47k C1 forms a DC blocking capacitor to isolate the dc of the HPOUT from the headphones. R1 form a pull down resistor to discharge C1 to prevent the voltage at the connection to the headphones from rising to a level that may damage the headphones. BYPASS MODE The WM8731 includes a bypass mode whereby analogue line inputs are routed directly to the analogue line outputs and headphone outputs. The scheme for this is in Figure 22. 12.5K VMID LINEIN VMID HPOUT VMID FROM LINE INPUTS LINEOUT FROM DAC BYPASS (ON) DACSEL (OFF) SIDETONE (OFF) Figure 22 Signal Routing in Bypass Mode |
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