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WM8953ECS/RV Scheda tecnica(PDF) 30 Page - Wolfson Microelectronics plc |
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WM8953ECS/RV Scheda tecnica(HTML) 30 Page - Wolfson Microelectronics plc |
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30 / 100 page  WM8953 Production Data w PD, January 2009, Rev 4.0 30 INPUT PGA CONFIGURATION Each of the four Input PGAs can be configured in single-ended or pseudo-differential mode. Single-ended microphone operation of an Input PGA is selected by connecting the input source to the inverting PGA input. The non-inverting PGA input must be connected to VMID by setting the appropriate register bits. For pseudo-differential microphone operation, the inverting and non-inverting PGA inputs are both connected to the input source and not to VMID. For any line input or other connection not using the Input PGA, the appropriate PGA input should be disconnected from the external pin and connected to VMID. Register bits LMN1, LMP2, LMN3, LMP4, RMN1, RMP2, RMN3 and RMP4 control connection of the PGA inputs to the device pins as shown in Table 6. The maximum available attenuation on any of these input paths is achieved using these bits to disable the input path to the applicable PGA. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7 LMP4 0b LIN34 PGA Non-Inverting Input Select 0 = LIN4 not connected to PGA 1 = LIN4 connected to PGA 6 LMN3 0b LIN34 PGA Inverting Input Select 0 = LIN3 not connected to PGA 1 = LIN3 connected to PGA 5 LMP2 0b LIN12 PGA Non-Inverting Input Select 0 = LIN2 not connected to PGA 1 = LIN2 connected to PGA 4 LMN1 0b LIN12 PGA Inverting Input Select 0 = LIN1 not connected to PGA 1 = LIN1 connected to PGA 3 RMP4 0b RIN34 PGA Non-Inverting Input Select 0 = RIN4 not connected to PGA 1 = RIN4 connected to PGA 2 RMN3 0b RIN34 PGA Inverting Input Select 0 = RIN3 not connected to PGA 1 = RIN3 connected to PGA 1 RMP2 0b RIN12 PGA Non-Inverting Input Select 0 = RIN2 not connected to PGA 1 = RIN2 connected to PGA R40 (28h) 0 RMN1 0b RIN12 PGA Inverting Input Select 0 = RIN1 not connected to PGA 1 = RIN1 connected to PGA Table 6 Input PGA Configuration |
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