1 Features
1• Programmable Data Rates Up to 2 kSPS
• Single-Cycle Settling for All Data Rates
• Simultaneous 50-Hz and 60-Hz Rejection at
20 SPS
• Analog Multiplexer With 8 (ADS1148) and
4 (ADS1147) Independently Selectable Inputs
• Programmable Gain: 1 V/V to 128 V/V
• Dual-Matched Programmable Excitation Current
Sources
• Low-Drift Internal 2.048-V Reference
• Sensor Burnout Detection
• 4 or 8 General-Purpose I/Os (ADS1147 and
ADS1148)
• Internal Temperature Sensor
• Power Supply and VREF Monitoring (ADS1147 and
ADS1148)
• Self and System Calibration
• SPI™-Compatible Serial Interface
• Analog Supply: Unipolar (2.7 V to 5.25 V) or
Bipolar (±2.5 V)
• Digital Supply: 2.7 V to 5.25 V

2 Applications
• Temperature Measurement
– RTDs, Thermocouples, and Thermistors
• Pressure Measurement
• Flow Meters
• Factory Automation and Process Control

3 Description
The ADS1146, ADS1147, and ADS1148 devices are
precision, 16-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
ADS1147 and ADS1148 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 ADS1148, two for the ADS1147, and one for
the ADS1146. In addition, the multiplexer integrates
sensor burn-out detection, voltage bias for
thermocouples, system monitoring, and general
purpose digital I/Os (ADS1147 and ADS1148). 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.