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WM8993 数据表(PDF) 39 Page - Wolfson Microelectronics plc |
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WM8993 数据表(HTML) 39 Page - Wolfson Microelectronics plc |
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39 / 229 page  Production Data WM8993 w PD, November 2010, Rev 4.0 39 INPUT PGA CONFIGURATION Each of the Input PGAs can operate in a single-ended or differential mode. In differential mode, both inputs to the PGA are connected to the input source. In single-ended mode, the non-inverting input to the PGA must be connected to VMID. Configuration of the PGA inputs to the WM8993 input pins is controlled using the register bits shown in Table 3. Single-ended microphone operation is configured by connecting the input source to the inverting input of the applicable PGA. The non-inverting input of the PGA must be connected to the buffered VMID reference. Note that the buffered VMID reference must be enabled, using the VMID_BUF_ENA register, as described in “Reference Voltages and Master Bias”. Differential microphone operation is configured by connecting the input source to both inputs of the applicable PGA. Line inputs to the input pins IN1LN, IN2LN, IN1RN and IN2RN must be connected to the applicable PGA. The non-inverting input of the PGA must be connected to VMID. Line inputs to the input pins IN1LP, IN2LP, IN1RP or IN2RP do not connect to the input PGAs. The non-inverting inputs of the associated PGAs must be connected to VMID. The inverting inputs of the associated PGAs may be used as separate mic/line inputs if required. The maximum available attenuation on any of these input paths is achieved by using register bits shown in Table 3 to disconnect the input pins from the applicable PGA. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R40 (28h) Input Mixer2 7 IN2LP_TO_IN2L 0b IN2L PGA Non-Inverting Input Select 0 = Connected to VMID 1 = Connected to IN2LP Note that VMID_BUF_ENA must be set when using IN2L connected to VMID. 6 IN2LN_TO_IN2L 0b IN2L PGA Inverting Input Select 0 = Not connected 1 = Connected to IN2LN 5 IN1LP_TO_IN1L 0b IN1L PGA Non-Inverting Input Select 0 = Connected to VMID 1 = Connected to IN1LP Note that VMID_BUF_ENA must be set when using IN2L connected to VMID. 4 IN1LN_TO_IN1L 0b IN1L PGA Inverting Input Select 0 = Not connected 1 = Connected to IN1LN 3 IN2RP_TO_IN2R 0b IN2R PGA Non-Inverting Input Select 0 = Connected to VMID 1 = Connected to IN2RP Note that VMID_BUF_ENA must be set when using IN2L connected to VMID. 2 IN2RN_TO_IN2R 0b IN2R PGA Inverting Input Select 0 = Not connected 1 = Connected to IN2RN 1 IN1RP_TO_IN1R 0b IN1R PGA Non-Inverting Input Select 0 = Connected to VMID 1 = Connected to IN1RP Note that VMID_BUF_ENA must be set when using IN2L connected to VMID. 0 IN1RN_TO_IN1R 0b IN1R PGA Inverting Input Select 0 = Not connected 1 = Connected to IN1RN Table 3 Input PGA Configuration |
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