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WM8959 датащи(PDF) 47 Page - Wolfson Microelectronics plc |
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WM8959 датащи(HTML) 47 Page - Wolfson Microelectronics plc |
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47 / 155 page ![]() Pre-Production WM8959 w PP, May 2008, Rev 3.1 47 In Differential Mode (AINLMODE=10, AINRMODE=10), no additional volume control is available in the input signal path, but the Input PGA volume control can be used to adjust the signal level as with other modes. Both PGAs on the desired channel(s) must be enabled, and the PGA volumes of each set to the same value for true Differential input characteristics. The PGA Output (LIN12 or RIN12) to Mixer (INMIXL or INMIXR) path must also be enabled on the desired channel(s) by use of register bit L12MNB or R12MNB. This configuration is illustrated in Figure 26. The applicable register settings are shown in Table 11. CONFIGURATION REGISTER SETTINGS 1. Select Differential Mode AINLMODE = 10 2. Enable LIN12 input path L12MNB = 1 Left Channel Differential Mode (DIFFINL to AINLMUX) 3. Set channel volume as required. Important: The LIN12 and LIN34 volume and mute settings must be set to the same value. See Table 5 for full definitions of these fields. LIN12VOL, LIN12MUTE LIN34VOL, LIN34MUTE 1. Select Differential Mode AINRMODE = 10 2. Enable RIN12 input path R12MNB = 1 Right Channel Differential Mode (DIFFINR to AINRMUX) 3. Set channel volume as required. Important: The RIN12 and RIN34 volume and mute settings must be set to the same value. See Table 5 for full definitions of these fields. RIN12VOL, RIN12MUTE RIN34VOL, RIN34MUTE Table 11 Differential Mode Register Settings Figure 26 Differential Mode Signal Paths |
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