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 built-in, 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.
● 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
