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AN4092 Datasheet(PDF) 30 Page - STMicroelectronics

No. de pieza AN4092
Descripción Electrónicos  Low to mid range engine management
PDF  38 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4092 Datasheet(HTML) 30 Page - STMicroelectronics

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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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