"A-weightede" in sigma delta DAC

[nathanee]

Hi,

For a sigma delta ADC, there is a spec related to SNR called "A-weighted".
What is the meaning of "A-weighted"?

Thanks in advance.

-nathan

 

[bear7679]

A-weighted means a-weighted filter. After you have get the DAC's SNR at different frequency, then use an a-weighted filter to calculate the SNR of the DAC. It makes the frequency which human is sensitive to be a larger value, which human is not sensitive to be a small value.
My english is not good, I hope you can understane.

 

[nathanee]

Thanks for the reply.

Where can I get the A-weighted filter's spec or related documentation?
It seems that it is a standard filter, including the coefficient, or weighted number.

BTW, should I add this filter is the EV board?

Thanks in advance.

 

[bear7679]

You can see something about a-weighted filter at this website:
**broken link removed**