Modern successive-approximation analog-to-digital converter ICs are replacing older current-mode D/A structures with capacitor arrays, called CDACs (for Capacitor D/A). This change makes it easier to combine the analog components of the converter with the digital elements in standard CMOS structures. Additionally, the capacitor input structure adds inherent sampling to the A/D, at a time when more and more A/D applications are involved in signal processing.