LM5066I: Anti-aliasing Filter before ADC?

LIN

Part Number: LM5066I

LT5066I has built-in ADC for voltage and current measurement. Since current may change dynamically, and voltage may has high ripples, is there any anti-aliasing filter before ADC? Any details on the filter bandwidth?

Thanks.

over 5 years ago

0 Rakesh over 5 years ago

TI__Guru* 95911 points

Hi Aibing,

Do you have any specific target on current monitoring accuracy?
Regarding your question, I need to check and it will take sometime to get back.

Best Regards,
Rakesh

0 LIN over 5 years ago in reply to Rakesh

Intellectual 410 points

If no anti-aliasing filter before ADC, the frequency spectrum higher than Nyquist frequency folds back, especially for current measurement. The data is probably not meaningful, also probably not possible to estimate the accuracy. Am I right?

I don't need very high accuracy, let say +/-5%, is that possible?

Please do help to check on my questions. Thanks.

0 Rakesh over 5 years ago in reply to LIN

TI__Guru* 95911 points

Hi Aibing,

Regarding accuracy, this device provides current information with +/-1.75% accuracy. I am sure, those were taken care in design and it will be hard to share internal implementation and approach. Let me try again.

Best Regards,
Rakesh

0 LIN over 5 years ago in reply to Rakesh

Intellectual 410 points

Hi Rakesh,

Thanks. I also hope anti-aliasing is taken care in the IC, but I cannot find any info to support that.

It is more difficult since multiple inputs are multiplexed to the ADC input.

Looking forward to your advice.

0 LIN over 5 years ago in reply to LIN

Intellectual 410 points

Hi Rakesh,

Any update?

Thanks.

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LM5066I: Anti-aliasing Filter before ADC?