Abstract: A digital-to-analog converter (DAC) for generating a high-precision analog output signal corresponding to a non-linear function, such as a sine function, of a digital input quantity, without the need for large numbers of precision current generators. Binary weighted current sources provide currents that, when selectively combined to provide a single output current, are approximately equivalent to the non-linear function of the digital input quantity, and an interpolation network provides an interpolation current that is added to the output current. The interpolation network may be selected to provide linear or non-linear interpolation between output current values. In other disclosed embodiments, multiple interpolation networks are used, either to provide different interpolation techniques for different ranges of input values, or to be connected effectively in series to provide for still greater accuracy without using additional current sources.