Texas Instruments' ADS8688 are 8-channel integrated data acquisition systems based on a 16-bit, successive approximation (SAR) analog-to-digital converter (ADC) operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096 V reference with low temperature drift. Operating on a single 5 V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high DC precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1 MΩ constant resistive input impedance irrespective of the selected input range.

The ADS8688 offer a simple, SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.