There are a number of reasons to use a current output architecture over voltage output. Firstly, I_OUT DACs let the designer choose their own output amplifier. This provides the freedom to construct and compensate an output loop with speed, noise, power, range, drive, stability, and accuracy specific to the application. In addition, the reference load impedance stays constant, and therefore can be driven with an unbuffered reference or a slow low-precision op-amp with no impact on static or dynamic performance. Since both amplifier inputs are always at ground, the common-mode rejection of the output amplifier is not critical. Lastly, current output DACs offer the highest precision available, whereas similar V_OUT DACs often cannot achieve the same precision INL.