ADS1120 ADC for Small Signal Sensors

By Texas Instruments 128

ADS1120 ADC for Small Signal Sensors

Texas Instruments' ADS1120 is a precision, 16-bit, analog-to-digital converter (ADC) that offers many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two differential or four single-ended inputs through a flexible input multiplexer (mux), a low-noise, programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor.

The device can perform conversions at data rates up to 2000 samples-per-second (SPS) with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50 Hz and 60 Hz rejection for noisy industrial applications. The internal PGA offers gains up to 128 V/V. This PGA makes the ADS1120 ideally-suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors. The device supports measurements of pseudo- or fully-differential signals when using the PGA. Alternatively, the device can be configured to bypass the internal PGA while still providing high input impedance and gains up to 4 V/V, allowing for single-ended measurements.

Features Applications
  • Low current consumption:
    As low as 120 μA (typ) in duty-cycle mode
  • Wide supply range: 2.3 V to 5.5 V
  • Programmable gain: 1 V/V to 128 V/V
  • Programmable data rates: Up to 2 kSPS
  • 16-bit noise-free resolution at 20 SPS
  • Simultaneous 50 Hz and 60 Hz rejection at 20 SPS with single-cycle settling digital filter
  • Temperature sensors:
    • Thermocouples
    • Resistance Temperature Detectors (RTDs):
      2-, 3-, or 4-wire types
  • Bridge sensors
  • Portable instrumentation
  • Factory automation and process controls

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