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Hello,
I tried LPF in Scan _ADC_v3_10 in various ways.
In conclusion, the minimum corner freq(kHz) was 0.8kHz like below.
We could not set lower frequency than 0.8kHz. Is this correct?
Best regards,
Yocchi
Solved! Go to Solution.
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Hi Yocchi-san,
40 Hz corner frequency is not achievable using UAB filter due to the minimum sample rate requirement (50 kHz) and maximum allowed OSR (200). The warning in your previous screen shot is due to achieved corner frequency using discrete cap values is greater than 5% from the desired value. Setting the corner frequency to 0.44 kHz fits within 5% margin as below.
Thanks,
Dinesh
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Hello Yocchi san,
What is the adc scan rate and filter filter rate you require ? ,
Best Regards
Vasanth
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Hi Yocchi-san,
When using 83.3 ksps sample rate of filter(from your captures), considering a max OSR of 200, the filter cut-off can go down to 0.4 kHz. Could you please let me know what is your desired filter cut-off and ADC sample rate?
Thanks,
Dinesh
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Hello Vasanth-san, Dinesh-san,
Please see the below.
We hope the cut off frequency 40Hz.
and if we set cutt off frequcncy 420Hz, we have more than 5% off target.
Best regards,
Yocchi
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Hi Yocchi-san,
40 Hz corner frequency is not achievable using UAB filter due to the minimum sample rate requirement (50 kHz) and maximum allowed OSR (200). The warning in your previous screen shot is due to achieved corner frequency using discrete cap values is greater than 5% from the desired value. Setting the corner frequency to 0.44 kHz fits within 5% margin as below.
Thanks,
Dinesh
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Dinesh-san,
OK. Thank you.
Best regards,
Yocchi