DEWESOFT SIRIUS Series

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SIRIUS

® 

TECHNICAL REFERENCE MANUAL 

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6.1.5.2. ADC digital ﬁlter and oversampling 

SIRIUS® will automatically adjust the oversampling depending on the sample rate. 

The digital ﬁlter cut off frequency is automatically set to half of the sample rate and the internal                  

sampling frequency is up to 256 times higher than the output rate: 

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Digital Filter (vs. Sample Rate) 

0.1 ... 51.2 kS/s 

51.2 ... 102.4 kS/s 

102.4 ... 204.8 kS/s 

Bandwidth (-3 dB) 

0.494 fs 

0.49 fs 

0.38 fs 

Alias-free Bandwidth 

DC to 0.42 fs 

DC to 0.32 fs 

DC to 0.22 fs 

Alias Rejection 

-95 dB 

-92 dB 

-97 dB 

Delay through ADC 

12 / fs 

9 / fs 

5 / fs 

Oversampling 

256 

128 

64 

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The ﬁlter characteristics of the digital ADC ﬁlter will also change automatically depending on the               

sample rate. 

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Sample rate 100 Hz to 51.2 kHz stopband rejection 

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SIRIUS

V20-1 282 / 336  

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