ADS1247IPW

The ADS1246, ADS1247, and ADS1248 devices are
precision, 24-bit analog-to-digital converters (ADCs)
that include many integrated features to reduce
system cost and component count for sensor
measurement applications. The devices feature a
low-noise, programmable gain amplifier (PGA), a
precision delta-sigma (ΔΣ) ADC with a single-cycle
settling digital filter, and an internal oscillator. The
ADS1247 and ADS1248 devices also provide a builtin, low-drift voltage reference, and two matched
programmable excitation current sources (IDACs).
An input multiplexer supports four differential inputs
for the ADS1248, two for the ADS1247, and one for
the ADS1246. In addition, the multiplexer integrates
sensor burn-out detection, voltage bias for
thermocouples, system monitoring, and general
purpose digital I/Os (ADS1247 and ADS1248). The
PGA provides selectable gains up to 128 V/V. These
features provide a complete front-end solution for
temperature sensor measurement applications
including thermocouples, thermistors, and resistance
temperature detectors (RTDs) and other small signal
measurements including resistive bridge sensors.
The digital filter settles in a single cycle to support
fast channel cycling when using the input multiplexer
and provides data rates up to 2 kSPS. For data rates
of 20 SPS or less, both 50-Hz and 60-Hz interference
are rejected by the filter.