Four and eight-channel integrated data acquisition systems based 16-bit SAR ADCs
The ADS8684 and ADS8688 are 4- and 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 Texas Instruments (TI) 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, 4.096V reference with low temperature drift.
Operating on a single 5V analog supply, each input channel on the devices
can support true bipolar input ranges of ±10.24V, ±5.12V, and ±2.56V, as
well as unipolar input ranges of 0V to 10.24V and 0V to 5.12V. 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 1Mohm constant resistive input impedance
irrespective of the selected input range, says the company.