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Texas Instruments ADS112U04IRTET
- Part No.:
- ADS112U04IRTET
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS112U04IRTET.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,430
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Product details
Overview
ADS112U04IRTET from Texas Instruments is a 16-bit, delta-sigma analog-to-digital converter with integrated UART interface, programmable gain amplifier (PGA), dual matched current sources (10 µA to 1.5 mA), internal 2.048-V reference (5 ppm/°C drift), and precision temperature sensor (±0.5°C accuracy). It supports up to 2 kSPS, offers simultaneous 50/60-Hz rejection at 20 SPS, and targets thermocouple and RTD measurement in industrial temperature transmitters.
For engineers reviewing the ADS112U04IRTET datasheet, ADS112U04IRTET pinout, ADS112U04IRTET application, or ADS112U04IRTET equivalent, this page delivers verified specifications, WQFN-16 pin mapping, real-world use cases in PLC analog input modules and patient monitoring systems, and validated alternative parts for design continuity.
Technical Context
The ADS112U04IRTET integrates a low-noise PGA (gain 1–128), flexible 4-channel analog multiplexer (supporting two differential or four single-ended inputs), and on-chip 2.048-V reference with 5 ppm/°C typical drift. Its digital filter enables single-cycle settling and simultaneous 50-Hz/60-Hz rejection at 20 SPS - critical for noisy industrial environments.
It features a 2-wire UART interface (8-N-1, up to 120 kBaud with auto-baud detection) and three GPIOs (GPIO0, GPIO1, GPIO2/DRDY), enabling direct microcontroller connectivity without external level shifters or protocol converters. The device operates from –40°C to +125°C and supports unipolar (2.3 V–5.5 V) and bipolar analog supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes; ensures full-scale linearity for high-fidelity sensor digitization. |
| Data Rate | Up to 2 kSPS in turbo mode; supports fast-response temperature control loops and transient detection. |
| Input Configuration | Two differential or four single-ended inputs via integrated MUX; simplifies wiring for multi-sensor systems. |
| PGA Gain Range | 1 to 128; enables direct interface with low-output sensors like K-type thermocouples (≈41 µV/°C) and 100-Ω RTDs. |
| Reference Voltage | Internal 2.048-V reference with 5 ppm/°C typical drift; eliminates need for external precision reference in cost-sensitive designs. |
| Current Sources | Dual matched IDACs (10 µA–1.5 mA); supports 2-/3-/4-wire RTD excitation and burn-out detection with ≤0.3% matching error. |
| Temperature Sensor | Integrated sensor with 0.03125°C resolution and ±0.5°C accuracy over –40°C to +125°C; enables cold-junction compensation without external ICs. |
Pinout & Package
ADS112U04IRTET is housed in a 3.0-mm × 3.0-mm, 0.75-mm height, 16-pin WQFN package (RTE) with exposed thermal pad connected to AVSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog input | Four single-ended or two differential analog inputs; configurable via MUX register for flexible sensor routing. |
| REFP / REFN | Reference input | Differential reference pair; accepts internal 2.048 V or external reference up to AVDD–AVSS. |
| AVDD / AVSS | Analog supply | Separate analog power domain (2.3 V–5.5 V); decoupling to AVSS minimizes noise coupling into ADC core. |
| DVDD / DGND | Digital supply | Digital I/O supply (2.3 V–5.5 V); independent from analog rail to suppress digital switching noise. |
| RX / TX | UART interface | 2-wire UART (8-N-1) with auto-baud detection; reduces isolation channel count in high-voltage industrial systems. |
| GPIO0–GPIO2/DRDY | General-purpose I/O | Three configurable pins; GPIO2 doubles as DRDY (data-ready) flag for interrupt-driven data acquisition. |
| RESET | Digital input | Active-low hardware reset; initiates power-on reset sequence and clears internal registers. |
| Thermal Pad | Thermal path | Exposed pad must be soldered to AVSS plane for optimal thermal performance (RθJA = 57.7°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50/60-Hz rejection | Enabled at 20 SPS with single-cycle settling; eliminates need for external notch filters in AC-line-noise environments. |
| Low-power operation | 315 µA typical current consumption in normal mode; extends battery life in portable temperature loggers. |
| Integrated cold-junction compensation | On-chip temperature sensor with ±0.5°C accuracy directly supports K-type thermocouple measurement without external components. |
| UART with auto-baud detection | Eliminates fixed baud-rate configuration; simplifies firmware integration across diverse host microcontrollers. |
| Programmable excitation currents | Seven IDAC settings (10–1500 µA) with ≤6% accuracy; enables precise 2-/3-/4-wire RTD biasing and fault diagnostics. |
Applications
| PLC Analog Input Module | Industrial Temperature Transmitter |
|---|---|
|
Use Scenario: Digitizing 4–20 mA loop signals and thermocouple outputs in modular I/O racks for factory automation. IC Role / Device Role / Timing Role: Primary ADC with integrated PGA, reference, and UART; replaces discrete signal-conditioning chain and external isolators. Use Value: Reduces BOM count by ≥5 components per channel and enables direct RS-485/UART communication to controller without protocol translation. |
Use Scenario: Converting K-type thermocouple voltage to digital output in DIN-rail-mounted field transmitters for HVAC and process control. IC Role / Device Role / Timing Role: Precision front-end with cold-junction compensation, programmable gain, and 50/60-Hz rejection for stable readings in electrically noisy plants. Use Value: Achieves ±0.5°C system-level accuracy without calibration, leveraging internal 2.048-V reference and matched IDACs for sensor excitation. |
| Patient Monitoring System | Climate Chamber Controller |
|
Use Scenario: Measuring body temperature via thermistor or thermocouple probes in bedside monitors and infusion pumps. IC Role / Device Role / Timing Role: Low-noise, low-power ADC with integrated temperature sensor; handles both probe signal and ambient sensing in one chip. Use Value: Enables battery-powered operation for >72 hours while maintaining medical-grade accuracy (IEC 60601-1 compliant signal chain). |
Use Scenario: Closed-loop temperature control in environmental test chambers requiring uniform thermal profiles across large volumes. IC Role / Device Role / Timing Role: High-resolution ADC for feedback from multiple PT100 sensors distributed across chamber walls and air ducts. Use Value: 16-bit resolution and <490 nVRMS noise at 20 SPS ensure sub-0.1°C stability in PID control algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | 24-bit delta-sigma ADC, SPI interface, no UART; higher resolution but requires external level-shifting for isolation. | Better suited for ultra-high-precision lab equipment; lacks integrated UART and cold-junction sensor. | Select when resolution >16 bits is mandatory and host MCU supports SPI with isolation. |
| AD7124-4BRUZ | 24-bit sigma-delta ADC, SPI interface, 4-channel, integrated PGA and reference; no UART or GPIOs. | Targeted at high-channel-count data acquisition; requires external UART bridge or MCU with dedicated UART peripheral. | Choose for multi-sensor systems needing >100 dB SNR and built-in burn-out detection, accepting added interface complexity. |
Compared with ADS112U04IRTET, ADS1220IPWR trades UART simplicity for higher resolution and lower noise, while AD7124-4BRUZ offers more channels and better SNR but increases system-level design effort due to missing native UART and GPIO flexibility.
Availability
ADS112U04IRTET is available at Aetrix Electronics and suitable for industrial temperature transmitters, PLC analog input modules, and patient monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADS112U04IRTET includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data conversion and industrial signal conditioning.
The ADS112U04IRTET belongs to TI's precision delta-sigma ADC product line, designed specifically for isolated, low-power, sensor-signal digitization in harsh industrial and medical environments where UART interface and integrated diagnostics reduce system complexity.
FAQ
What is the operating temperature range of the ADS112U04IRTET?
The ADS112U04IRTET is specified for continuous operation from –40°C to +125°C ambient temperature. This extended range supports deployment in demanding environments such as industrial ovens, motor control cabinets, and outdoor process instrumentation where thermal stress is common. All key specifications-including INL, gain error, and reference drift-are guaranteed across this full range.
Does the ADS112U04IRTET support external reference voltage?
Yes, the ADS112U04IRTET supports external reference voltages applied differentially between REFP and REFN pins, with valid range from 0.75 V to AVDD–AVSS. When using external reference, the internal 2.048-V reference is disabled. This allows optimization for specific full-scale ranges or improved absolute accuracy using a higher-stability external reference.
How does the UART interface of the ADS112U04IRTET simplify isolated designs?
The ADS112U04IRTET's 2-wire UART interface (RX/TX) reduces required isolation channels from four (for SPI) to two, cutting isolation component cost and board space. Its auto-baud detection eliminates fixed clock dependency, and 8-N-1 format ensures compatibility with standard microcontroller UART peripherals-enabling seamless galvanic isolation in safety-critical industrial systems.
Can the ADS112U04IRTET perform cold-junction compensation for thermocouples without external components?
Yes, the ADS112U04IRTET integrates a precision temperature sensor (±0.5°C accuracy) and dedicated CJC circuitry. When configured for thermocouple measurement, it automatically reads its own die temperature and applies correction to the thermocouple voltage, eliminating the need for external thermistors, RTDs, or compensation ICs in K-type and other base-metal thermocouple applications.
What are the power supply requirements for the ADS112U04IRTET analog and digital rails?
The ADS112U04IRTET requires separate analog (AVDD/AVSS) and digital (DVDD/DGND) supplies. AVDD operates from 2.3 V to 5.5 V (unipolar) or ±2.3 V to ±2.75 V (bipolar); DVDD ranges from 2.3 V to 5.5 V. AVSS and DGND may be tied together or kept separate depending on noise isolation needs. Decoupling capacitors (≥100 nF) are mandatory at each supply pin.
ADS112U04IRTET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 2k
- Number of Inputs:
- 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- UART
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-WQFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS112U04IRTET FAQ
1.How can I place an order for ADS112U04IRTET through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS112U04IRTET on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS112U04IRTET reliable?
The price and inventory of ADS112U04IRTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS112U04IRTET is usually 5 days.
3.What payment methods are accepted for ADS112U04IRTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS112U04IRTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS112U04IRTET?
ADS112U04IRTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS112U04IRTET order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS112U04IRTET?
For technical support, including ADS112U04IRTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS112U04IRTET requirements.
6.How does Aetrix verify that ADS112U04IRTET is sourced from the original manufacturer or authorized distributors?
All ADS112U04IRTET products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS112U04IRTET meets industry standards.
7.What is the process for return or replacement of ADS112U04IRTET?
All ADS112U04IRTET units undergo pre-shipment inspection (PSI). If there is an issue with ADS112U04IRTET, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS112U04IRTET part is unused and in its original packaging.
Return procedure for ADS112U04IRTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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