Hi,
I am designing an audio DAC - simple, but with high quality components. The I/V conversion and filtering of the PCM1794 outputs is based on the application circuit on page 16 in the OPA1611/OPA1612 datasheet. However, I wish to retain the differential outputs (without adding a second PCM1794). My question is whether this can be achieved by simply splitting the differential filter circuit like so?
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The performance looks fine based on a basic analysis in TINA-TI, but I am wondering if there are any other practical considerations that would make this a bad idea. The OPA1632 might be a more obvious choice, but I'd prefer the OPA1612, unless there is a performance penalty, as it simplifies the layout in this particular case. TINA-Ti showed almost identical results for OPA1612 and OPA1632, but these are after all simulations.
Is the design viable? Are there better ways to get differential outputs from one PCM1794?
Thanks,
Trond
