In summary, digital to analog converters may require reference or output buffering to achieve optimum performance. When considering a reference buffer, it is critical to select one with very low noise and low offset error in order minimize gain errors at the DAC output. When considering output buffers, it is important to bear in mind that the slew rate and settling time of the DAC circuit is going to be largely determined by the output amplifier selected. Ultimately, amplifier selection will be application dependent.