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WM8960 数据表(PDF) 23 Page - Wolfson Microelectronics plc |
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WM8960 数据表(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 92 page  Production Data WM8960 w PD, August 2013, Rev 4.2 23 INPUT BOOST The input path to the ADCs is via a boost stage, which can mix signals from the microphone PGAs and the line inputs. The boost stage can provide up to +29dB additional gain from the microphone PGA output to the ADC input, providing a total maximum available analogue gain of +59dB from microphone to ADC. The microphone PGA path to the boost mixer is muted using LINMUTE and RINMUTE as shown in Table 4. Microphone PGA to boost gain settings are shown in Table 5. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R32 (20h) ADCL Signal path 5:4 LMICBOOST [1:0] 00 Left Channel Input PGA Boost Gain 00 = +0dB 01 = +13dB 10 = +20dB 11 = +29dB R33 (21h) ADCR Signal path 5:4 RMICBOOST [1:0] 00 Right Channel Input PGA Boost Gain 00 = +0dB 01 = +13dB 10 = +20dB 11 = +29dB Table 5 Microphone PGA Boost Control For line inputs, -12dB to +6dB gain is available on the boost mixer, with mute control, as shown in Table 6. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R43 (2Bh) Input Boost Mixer 1 6:4 LIN3BOOST [2:0] 000 LINPUT3 to Boost Mixer gain 000 = Mute 001 = -12dB ...3dB steps up to 111 = +6dB 3:1 LIN2BOOST [2:0] 000 LINPUT2 to Boost Mixer gain 000 = Mute 001 = -12dB ...3dB steps up to 111 = +6dB R44 (2Ch) Input Boost Mixer 2 6:4 RIN3BOOST [2:0] 000 RINPUT3 to Boost Mixer gain 000 = Mute 001 = -12dB ...3dB steps up to 111 = +6dB 3:1 RIN2BOOST [2:0] 000 RINPUT2 to Boost Mixer gain 000 = Mute 001 = -12dB ...3dB steps up to 111 = +6dB Table 6 Line Input Boost Control When all three input paths to the boost mixer are disabled, the boost mixer will automatically be muted. |
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