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WM8775SEDS/R Datasheet(PDF) 36 Page - Wolfson Microelectronics plc |
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WM8775SEDS/R Datasheet(HTML) 36 Page - Wolfson Microelectronics plc |
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36 / 39 page ![]() WM8775 Production Data w PD Rev 4.1, June 2006 36 APPLICATIONS INFORMATION EXTERNAL CIRCUIT CONFIGURATION In order to allow the use of 2V rms and larger inputs to the ADC inputs, a structure is used that uses external resistors to drop these larger voltages. This also increases the robustness of the circuit to external abuse such as ESD pulse. Figure 28 shows the ADC input multiplexor circuit with external components allowing 2Vrms inputs to be applied. AIN1L 10K 10uF AIN2L 10K 10uF AIN3L 10K 10uF AIN4L 10K 10uF AIN1R 10K 10uF AIN2R 10K 10uF AIN3R 10K 10uF AIN4R 10K 10uF SOURCE SELECTOR INPUTS AINVGR AINOPR 5K AINVGL AINOPL 5K Figure 28 ADC Input Multiplexor Configuration |
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