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WM8961 датащи(PDF) 22 Page - Wolfson Microelectronics plc |
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WM8961 датащи(HTML) 22 Page - Wolfson Microelectronics plc |
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22 / 116 page ![]() WM8961 Pre-Production w PP, August 2009, Rev 3.1 22 INPUT SIGNAL PATH The WM8961 has a flexible stereo analogue input channel which can be configured as line inputs or single-ended microphone inputs. The input signal path consists of an input volume control using a Programmable Gain Amplifier (PGA), followed by an input boost stage. The output of the boost stage drives a hi-fi stereo ADC. This is shown in Figure 12 Figure 12 Analogue Input Stage The input PGAs and boost stage are enabled by the AINL and AINR register bits. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R25 (19h) Power Management (1) 5 AINL 0 Left channel input PGA and boost stage enable 0 = PGA disabled, boost disabled 1 = PGA enabled boost enabled 4 AINR 0 Right channel input PGA and boost stage enable 0 = PGA disabled, boost disabled 1 = PGA enabled boost enabled Table 4 Input PGA and Boost Enable Register Settings INPUT PGA VOLUME CONTROLS The gain of the microphone PGAs can be manually configured, or automatically controlled using the ALC / Limiter. (Refer to section headed Automatic Level Control for more details). The input PGA stage provide a general volume control for the LINPUT and RINPUT microphone inputs and have a gain range from -23.25dB to +24dB in 0.75dB steps. The gain of the PGAs is controlled by the register bits LINVOL[5:0] and RINVOL[5:0]. |
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