ADS1148-Q1 - Automotive 16-Bit 2kSPS 8-Ch ADC for Precision Sensor Measurement

The ADS1148-Q1 is a highly-integrated, precision, 16-bit analog-to-digital converter (ADC) that includes many integrated features to reduce system cost and component count for sensor measurement applications. The device features 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 ADS1148-Q1 integrates a low-drift voltage reference, and two matched programmable excitation current sources (IDACs).

The device offers a fully flexible multiplexer that allows both positive and negative inputs to be selected independently. In addition, the multiplexer integrates sensor burn-out detection, voltage bias for thermocouples, system monitoring, and eight general-purpose digital I/Os (GPIOs). 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. 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 the 50-Hz and 60-Hz interference are rejected by the filter.

• Qualified for Automotive Applications
• AEC-Q100 Qualified with the Following Results:
  • Temperature Grade 1: –40°C to +125°C
  • HBM ESD Classification 2
  • CDM ESD Classification C5
• Programmable Gain: 1 V/V to 128 V/V
• Programmable Data Rates: 5 SPS to 2 kSPS
• Single-Cycle Settling for All Data Rates
• Analog Multiplexer With 8 Independently Selectable Inputs
• Dual-Matched Programmable Excitation Current Sources: 50 µA to 1.5 mA
• Internal 2.048-V Voltage Reference
• Internal 4.096-MHz Oscillator
• Internal Temperature Sensor
• Open Sensor Detection
• Power-Supply and External Reference Monitoring
• Self and System Calibration
• 8 General-Purpose I/Os
• 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