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WM8774IFT Datasheet(PDF) 38 Page - Wolfson Microelectronics plc |
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WM8774IFT Datasheet(HTML) 38 Page - Wolfson Microelectronics plc |
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38 / 42 page  WM8774 Product Preview PP Rev 1.0 June 2002 38 AIN1L 10K 10uF AIN2L 10K 10uF AIN3L 10K 10uF AIN7L 10K 10uF AIN8L 10K 10uF AIN1R 10K 10uF AIN2R 10K 10uF AIN3R 10K 10uF AIN7R 10K 10uF AIN8R 10K 10uF SOURCE SELECTOR INPUTS AINVGR AINOPR 5K AINVGL AINOPL 5K EXTERNAL CIRCUIT CONFIGURATION In order to allow the use of 2V rms and larger inputs to the ADC and AUX 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 32 shows the ADC input multiplexor circuit with external components allowing 2Vrms inputs to be applied. Figure 32 ADC Input Multiplexor Confiuration DAC AUX BYPASS INPUTS 10K MX[0] MX[1] MX[2] 10K 10K 10K DACL/R BYPASSL/R AUXL/R 10uF Figure 33 5.1 Channel Input Multiplexor Configuration |
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