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 (ADS1248) and 4
(ADS1247) Independently Selectable Inputs
• Low-Noise PGA: 48 nVRMS at PGA = 128
• Dual-Matched Programmable Excitation Current
Sources
• Low-Drift Internal 2.048-V Reference:
10 ppm/°C (Maximum)
• Sensor Burn-Out Detection
• 4 or 8 General-Purpose I/Os (ADS1247,
ADS1248)
• Internal Temperature Sensor
• Power Supply and VREF Monitoring (ADS1247,
ADS1248)
• Self and System Calibration
• SPI™-Compatible Serial Interface
• Analog Supply: Unipolar (2.7 V to 5.25 V) and
Bipolar (±2.5 V) Operation
• Digital Supply: 2.7 V to 5.25 V

2 Applications
• Temperature Sensor Measurements:
– RTDs, Thermocouples, and Thermistors
• Pressure Measurements
• Flow Meters
• Factory Automation and Process Controls

3 Description
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.