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AN4092 データシート(PDF) 30 Page - STMicroelectronics |
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AN4092 データシート(HTML) 30 Page - STMicroelectronics |
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30 / 38 page  ADC AN4092 30/38 Doc ID 023080 Rev 2 4.1 Alternative approach In some cases the filtering using the RC might not be effective. Instead of using costly active external analogue filters, an internal digital filtering can be implemented using the decimation filter. The approach is the following: 1. Choose a simple RC outside filter which cut-off frequency is much higher than the interested bandwidth of the signal, including the noise. 2. Oversample the signal, potentially sampling at the maximum frequency allowed by the ADC 3. Filter the noise out using the IIR / FIR feature 4. Decimate For example this approach can be very effective to threat knock sensors outputs, in which the big noise cannot be easily filtered out using a simple RC. |
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