in the datasheet of the adau1701 is an example with the active filter. is this opamp supplyd with + and - or a single one?
thanks for the help.
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:
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.
Thank you :-)
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