12-bit, 1.25-MSPS, one-channel, wide bandwidth SAR ADC with programmable input ranges on +5V supply

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.