The ODAC, a UAC1 DAC, is a co-design between Yoyodyne Consulting and audio blogger
NwAvGuy. The ODAC adheres to the principle of measurable performance (objective) versus
subjective performance (marketing and personal bias). All claims made about the ODAC are supported by repeatable testing procedures.
The ODAC is a daughter card that will mount in the ODA with a 4-pin header and mounting hardware. The ODAC may also be retrofitted internally to an O2 headphone amplifier when
the rechargable batteries are removed. A 4-40 3/8" screw and 2 nuts will physicially secure the ODAC to the O2 board. 3 wires must be soldered
between the ODAC and the O2 to connect the LINE-OUT of the ODAC to the input of the O2 input.
Alternately, the ODAC can be mounted in a small custom enclosure and used as a standalone DAC with the O2 or any amplifier that
has a 2vrms LINE-IN port. You may mount a 3.5mm connector (footprint on the board) or take the LINE-OUT to a pair of panel mounted RCA connectors.
The card is built around the Tenor TE7022L UAC1 engine and the ESS Technology ES9023 24 bit DAC. The ODAC is powered from the USB bus
with a low noise, filtered power supply.
The ODAC UAC1 engine, the TE7022L, is covered by an NDA and datasheets are not available to the public. Even with this limitation
there is interest in the ODAC schematic. Premission has been obtained from GFEC and I have made the ODAC schematic available.
You may download the ODAC schematic from
here
Yoyodyne
Consulting 