ADS112C04IRTET

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1. Describe

The ADS112C04IRTET is a precision 16-bit analog-to-digital converter (ADC) that provides many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two functions via 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. One differential or four single-ended inputs. The device can perform conversions at data rates up to 2000 samples per second (SPS) and has single-cycle settling. At 20 SPS, the digital filter provides both 50-Hz and 60-Hz rejection for noisy industrial applications. The internal PGA provides up to 128 gain. This PGA makes the ADS112C04 ideal for applications that measure small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistance bridge sensors. The ADS112C04IRTET has a 2-wire I2C compatible interface that supports I2C bus speeds up to 1 Mbps. Two address pins allow 16 different I2C addresses to be selected for the device. The ADS112C04 is available in a leadless 16-lead WQFN or 16-lead TSSOP package and is specified over the temperature range of –40°C to +125°C.

2. Feature

    1. Current consumption as low as 315 µA (typ)

    2. Wide supply range: 2.3 V to 5.5 V

    3. Programmable gain: 1 to 128

    4. Programmable data rate: up to 2 kSPS

    5. 16-bit, 20 SPS noise-free resolution

    6. 20 SPS simultaneous 50-Hz and 60-Hz rejection with single-cycle stable digital filter

    7. Two differential or four single-ended inputs

    8. Dual Matched Programmable Current Source: 10 µA to 1.5 mA

    9. Internal 2.048V reference: 5 ppm/°C (typ) drift

  10. Internal 2% precision oscillator

  11. Internal temperature sensor: 0.5°C (typ) accuracy

  12. I2C compatible interface

  13. Supported I2C bus speed modes: 

        - Standard Mode, Express Mode, Enhanced Express Mode

  14. 16-pin configurable I2C address

  15. Package: 3.0-mm × 3.0-mm × 0.75-mm WQFN

3. Application

    1. Field transmitters: temperature, pressure, strain, flow

    2. PLC and DCS analog input modules

    3. Temperature Controller

    4. Heat meter

    5. Patient monitoring system: temperature, blood pressure

4. Pin configuration

5. Pin Description

6. Application Information

The ADS112C04IRTET is a precision 16-bit delta-sigma (ΔΣ) analog-to-digital converter (ADC) that provides many integrated functions to simplify the measurement of the most common sensor types, including various types of sensor temperature and bridge sensors. Key considerations when designing an application with the ADS112C04IRTET include analog input filtering, establishing an appropriate external reference for ratiometric measurements, and setting the absolute input voltage range of the internal PGA. Connecting and configuring the interface properly is another issue. The following sections discuss these considerations.

7. Data Integrity Features

There are two ways to ensure the data integrity of the data output on the ADS112C04IRTET. The output data can be register contents or conversion results. Both data integrity options cover optional data counter words before converting data. Data integrity mode is configured using the CRC[1:0] bits in the configuration register. When CRC[1:0] = 01, a bit-reversed version of the data is output immediately after the most significant byte (MSB) of the data. When CRC[1:0] = 10, the 16-bit CRC word is output immediately after the MSB of the data.