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WM8731 Datasheet(PDF) 29 Page - Wolfson Microelectronics plc |
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WM8731 Datasheet(HTML) 29 Page - Wolfson Microelectronics plc |
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29 / 56 page  WM8731 Advanced Information WOLFSON MICROELECTRONICS LTD AI Rev 2.0 February 2001 29 The bypass mode is selected under software control using the BYPASS microphone bit as shown in Table 9. In true bypass mode, the output from the DAC (DACSEL) and (SIDETONE) should be de- selected from the line output block. However this can also be used to sum the DAC output, Line Inputs together and microphone inputs. The analogue line input and headphone output volume controls and mutes are still operational in bypass mode. The 0dB gain setting is recommended for the Line Input volume control to avoid distortion. The maximum signal at any point in the bypass path must be no greater than 1.0V rms at AVDD = 3.3V, to avoid distortion. This amplitude tracks linearly with AVDD. This means that if the DAC is producing a 1Vrms signal, and it is being summed with 1Vrms line BYPASS signal, the resulting LINEOP signal will be clipped. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 0000100 Analogue Audio Path Control 3 BYPASS 1 Bypass Switch (Analogue) 1 = Enable Bypass 0 = Disable Bypass Table 9 Bypass Mode Software Control SIDETONE MODE The WM8731 also includes a side tone mode where the microphone input is routed to line and headphone outputs. The scheme for this is shown in Figure 23. The side tone mode allows the microphone input to be attenuated to the outputs for telephone and headset applications. VMID HPOUT 50k 10k VMID MICIN VMID 10dB GAIN BOOST VMID FROM LINE INPUTS LINEOUT FROM DAC BYPASS (OFF) DACSEL (OFF) SIDETONE (ON) Figure 23 Side Tone Mode Schematic REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 5 SIDETONE 0 Side Tone Switch (Analogue) 1 = Enable Side Tone 0 = Disable Side Tone 0000100 Analogue Audio Path Control 7:6 SIDEATT[1:0] 00 Side Tone Attenuation 11 = -15dB 10 = -12dB 01 = -9dB 00 = -6dB Table 10 Side Tone Mode Table |
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