Eight-channel SAR ADC features integrated analog front-end circuitry

The Texas Instruments ADS8688AT is an eight-channel, integrated data acquisition system based on a 16-bit SAR ADC, operating at a throughput of up to 500kSPS. The device provides integrated analog front-end circuitry for each input channel with up to ±20V overvoltage protection, an eight-channel multiplexer with automatic and manual scanning modes, and an integrated 4.096V reference with low-temperature drift. Operating on a single 5V analog supply, each input channel can sustain multiple true bipolar as well as unipolar input ranges. Each input range is software-programmable and independent for each channel, enabling maximum system flexibility. The analog front-end gain is accurately trimmed to ensure high dc precision for all input ranges. The device offers a 1MOhm constant resistive input impedance for any selected input range, enabling direct sensor connection to the device. The device provides a simple SPI-compatible serial interface to the digital host and also supports daisy-chaining of multiple devices. The digital supply operates from 1.65V to 5.25V, allowing direct interface to a wide range of host controllers.