ADS1148IRHBT

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1. Description

The ADS1146, ADS1147, and ADS1148IRHBT 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 ADS1148IRHBT 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 ADS1148IRHBT, 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 . 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.

2. Features

    1. Programmable Data Rates Up to 2 kSPS

    2. Single-Cycle Settling for All Data Rates

    3. Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS

    4. Analog Multiplexer With 8 (ADS1148) and 4 (ADS1147) Independently Selectable Inputs

    5. Programmable Gain: 1 V/V to 128 V/V

    6. Dual-Matched Programmable Excitation Current Sources

    7. Low-Drift Internal 2.048-V Reference

    8. Sensor Burnout Detection

    9. 4 or 8 General-Purpose I/Os (ADS1147 and ADS1148)

  10. Internal Temperature Sensor

  11. Power Supply and VREF Monitoring (ADS1147 and ADS1148)

  12. Self and System Calibration

  13. SPI™-Compatible Serial Interface

  14. Analog Supply: Unipolar (2.7 V to 5.25 V) or Bipolar (±2.5 V)

  15. Digital Supply: 2.7 V to 5.25 V

3. Applications

    1. Temperature Measurement

        – RTDs, Thermocouples, and Thermistors

    2. Pressure Measurement

    3. Flow Meters

    4. Factory Automation and Process Control