ADS122C04 24-Bit Analog-to-Digital Converter

ADS122C04 24-Bit Analog-to-Digital Converter

Texas Instruments' ADS122C04 is a precision, 24-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, 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. This PGA makes the ADS122C04 ideally suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors.

The ADS122C04 features a 2-wire, I2C-compatible interface that supports I2C bus speeds up to 1 Mbps. Two address pins allow selection of 16 different I2C addresses for the device.

The ADS122C04 is offered in a leadless 16-pin WQFN or a 16-pin TSSOP package and is specified over a temperature range of -40°C to +125°C.

  • Current consumption as low as 315 µA (typ.)
  • Wide supply range: 2.3 V to 5.5 V
  • Programmable gain: 1 to 128
  • Programmable data rates: up to 2 kSPS
  • Up to 20-bit effective resolution
  • Simultaneous 50 Hz and 60 Hz rejection at 20 SPS with single-cycle settling digital filter
  • Two differential or four single-ended inputs
  • Dual-matched programmable current sources: 10 µA to 1.5 mA
  • Internal 2.048 V reference: 5 ppm/°C (typ.) drift
  • Internal 2% accurate oscillator
  • Internal temperature sensor: 0.5°C (typ.) accuracy
  • I2C-compatible interface
  • Supported I2C bus speed modes: standard-mode, fast-mode, fast-mode plus
  • 16 pin-configurable I2C addresses
  • Package: 3.0 mm x 3.0 mm x 0.75 mm WQFN
  • Field transmitters: temperature, pressure, strain, flow
  • PLC and DCS analog input modules
  • Temperature controllers
  • Heat meters
  • Patient monitoring systems: body temperature, blood pressure

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