LC filter vs Isolation tranformer for AC coupling of a DAC output
My first choice would be a Difference Amp with a capacitor on the output. Put a resistor from cap to your zero volts source (ground?) to reference it.  If you want some high frequency attenuation put a capacitor in parallel with R4.

For most opamps and TL0xx series in particular the inputs have to be somewhere between the supply voltages Vcc and Vee.  Could be near the middle of the range but as long as you're within the acceptable range (consult the datasheet for your particular opamp choice) it will be fine.







simulate this circuit &ndash; Schematic created using CircuitLab

If you use the current-output IC then you can omit the two input resistors (R2, R3).

Finally, since this circuit DC-couples into the difference amp, each input must be within the min/max range of the opamp.  Usually this means the lowest voltage has to be a couple volts or more above Vee and the highest must be a couple volts below Vcc.  Rail-rail opamps can work to within a tenth of a volt or so.  If your DDS is within this range you can use a 10V supply and connect Vee and the "DDS voltage reference" together.

But, if the DDS outputs go beyond this then it would make more sense to use a bipolar supply for the opamp, and connect "Ref" to "DDS voltage reference".