Active Filter Supply

Hi,

Are you referring to the Figure 19? Please be aware that there is a typo (I just noticed this now), the feedback capacitor should be 470 pF. Please see Figure 7 on page 12 of the eval board user guide:

http://www.analog.com/static/imported-files/user_guides/UG-072.pdf

The filter can be run from with a single-sided supply as shown here, please see the paragraph above Figure 18. Running this circuit from a bipolar supply would be fine also, since the CM voltage present at the DAC output would act as a reference voltage appearing at the non-inverting input of the op amp. You will need to keep the AC coupling (47 uF at the amp output) in the circuit either way.

Best regards,

Coleman

Thank you :-)