The ADS8661Wis an integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC) topology. The device features a high-speed, high-precision SAR ADC, integrated differential analog front-end (AFE) input driver circuit. The ADS8661W includes an overvoltage protection circuit up to ±20V and an on-chip 4.096V reference with extremely low temperature drift. The device operates on a single 5V analog supply, but support true bipolar input ranges and unipolar input ranges. The bipolar input ranges are ±12.288V, ±6.144V, ±10.24V, ±5.12V, and ±2.56V, and the unipolar input ranges are from 0V to 12.288V, 10.24V, 6.144V, and 5.12V. The devices offer a high resistive input impedance (≥ 1MΩ) irrespective of the selected input range. The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.