CAN or DAC combination
Conversions analogique-numérique et numérique-analogique (partie 2)

To achieve higher performance, one or more elementary converters may need to be combined. This can be implemented on a board or on a multi-chip integrated circuit.

The aim is often to go faster, achieve higher resolution, improve the signal-to-noise ratio, etc., for high-end, low-volume applications, while benefiting from standard components at an industrial price.

• Interlaced time combination

  This is the most intuitive solution: combine 3 ADCs, for example, to go 3 times faster. The signal must therefore be distributed to the 3 ADCs, either via a multiplexer preceding the sample-and-hold circuits, or by direct parallel connection. Each circuit then receives a clock shifted at f_ech / 3. In general, because of the gaps between the circuits, the noise induced by the proximity of the other two circuits (which expressed in LSB are significant), etc.,...