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WM8976 Datasheet(PDF) 24 Page - Wolfson Microelectronics plc |
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WM8976 Datasheet(HTML) 24 Page - Wolfson Microelectronics plc |
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24 / 83 page  WM8976 Preliminary Technical Data w PTD Rev 2.0 February 2005 24 INPUT SIGNAL PATH The WM8976 has a number of flexible analogue inputs. The input PGA stage is followed by a boost/mix stage which drives into the ADC. The input path has three input pins which can be configured in a variety of ways to accommodate single-ended, differential or dual differential microphones. There are two auxiliary input pins, and the AUXL input can be fed into to the input boost/mix stage as well as driving into the output path. A bypass path exists from the output of the boost/mix stage into the output left mixer. MICROPHONE INPUTS The WM8976 can accommodate a variety of microphone configurations including single ended and differential inputs. The input to the differential input PGA are LIN, LIP and L2. In single-ended microphone input configuration the microphone signal should be input to LIN or RIN and the internal NOR gate configured to clamp the non-inverting input of the input PGA to VMID. Figure 11 Microphone Input PGA Circuit |
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