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Texas Instruments ADS112C04IRTET
- Part No.:
- ADS112C04IRTET
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS112C04IRTET.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:968
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Product details
Overview
ADS112C04IRTET from Texas Instruments is a precision 16-bit delta-sigma ADC with integrated PGA (gain up to 128), dual programmable current sources (10 µA–1.5 mA), internal 2.048-V reference (5 ppm/°C drift), and I²C interface. It supports two differential or four single-ended inputs and delivers 16-bit noise-free resolution at 20 SPS for thermocouple, RTD, and bridge sensor signal conditioning in industrial field transmitters.
For engineers reviewing the ADS112C04IRTET datasheet, ADS112C04IRTET pinout, ADS112C04IRTET application, or ADS112C04IRTET equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for high-accuracy analog front-end design in temperature-critical systems.
Technical Context
The ADS112C04IRTET integrates a low-noise PGA, dual matched IDACs, internal oscillator, and precision temperature sensor (±0.5°C accuracy) - all operating within a –40°C to +125°C range. Its digital filter enables simultaneous 50-Hz and 60-Hz rejection at 20 SPS with single-cycle settling, eliminating external notch filtering.
It uses a 2-wire I²C interface supporting Standard-, Fast-, and Fast-Mode Plus (up to 1 Mbps), with 16 pin-configurable addresses via A0/A1. The device operates from 2.3 V to 5.5 V analog/digital supplies and achieves as low as 315 µA typical current consumption in normal mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes; ensures full-scale monotonicity for precision sensor digitization. |
| Data Rate | Up to 2 kSPS (turbo mode); 20 SPS offers simultaneous 50/60 Hz rejection for industrial EMI immunity. |
| PGA Gain Range | 1 to 128; enables direct measurement of µV-level thermocouple outputs without external amplification. |
| IDAC Output | 10 µA to 1.5 mA, matched ±2% (typ); supports 2-/3-/4-wire RTD excitation and burn-out detection. |
| Reference Voltage | Internal 2.048 V ±0.25% (WQFN), 5 ppm/°C drift (typ); eliminates need for external precision reference in most designs. |
| Temperature Sensor | Integrated ±0.5°C (–40°C to +125°C) sensor; enables cold-junction compensation for K-type thermocouples. |
| I²C Address Options | 16 unique addresses via A0/A1 pins; simplifies multi-node sensor networks on shared buses. |
Pinout & Package
ADS112C04IRTET is packaged in a 3.0-mm × 3.0-mm × 0.75-mm WQFN-16 (RTE) package with exposed thermal pad connected to AVSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | I²C address select inputs | Configure one of 16 slave addresses; pulled high/low to set static bus identity without firmware overhead. |
| AIN0–AIN3 | Analog input channels | Support flexible MUX configuration: two differential (e.g., AIN0–AIN1, AIN2–AIN3) or four single-ended inputs. |
| REFP / REFN | Differential reference inputs | Accept internal 2.048-V reference or external reference; enable ratiometric measurements with bridge sensors. |
| AVDD / AVSS | Analog power supply rails | Separate analog domain (2.3–5.5 V) isolates noise-sensitive conversion circuitry from digital switching. |
| DVDD / DGND | Digital power supply rails | Digital core powered independently; decoupling required per datasheet to maintain I²C timing integrity. |
| SCL / SDA | I²C serial interface | Support up to 1 Mbps (Fast-Mode Plus); require DVDD-referenced pullups for reliable communication. |
| DRDY | Data-ready indicator | Active-low open-drain output signals conversion completion; used for interrupt-driven readouts without polling. |
| RESET | Hardware reset input | Asynchronous active-low reset clears registers and reinitializes internal state; minimum pulse width 250 ns. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50/60 Hz rejection | Digital filter rejects both line frequencies in one 20-SPS conversion cycle - critical for unfiltered plant-floor environments. |
| Integrated cold-junction compensation | On-chip temperature sensor (±0.5°C) directly supports K-type thermocouple systems without external ICs or calibration lookup tables. |
| Dual matched IDACs | 10 µA–1.5 mA excitation currents with <2% matching error enable precise 3-/4-wire RTD measurements and automatic lead-wire resistance cancellation. |
| Low-power operation | 315 µA typical supply current (normal mode) extends battery life in portable or loop-powered field instruments. |
| Flexible reference options | Internal 2.048-V reference (5 ppm/°C) or external reference selection allows optimization between cost, accuracy, and system-level ratiometry. |
Applications
| Industrial Field Transmitter | PLC Analog Input Module |
|---|---|
Use Scenario: Digitizing K-type thermocouple outputs in hazardous-area temperature transmitters with 4–20 mA loop power. IC Role / Device Role / Timing Role: Primary ADC with integrated CJC, PGA, and IDACs performs cold-junction compensation, signal amplification, and digitization in a single chip. Use Value: Eliminates discrete op-amps, references, and temperature sensors - reducing BOM count by ≥4 components and PCB area by >30%. | Use Scenario: High-density analog input channel in modular PLC backplanes measuring multiple RTDs and thermistors. IC Role / Device Role / Timing Role: Configurable 4-channel ADC with programmable gain and data rate adapts to mixed-sensor types across slots. Use Value: Single ADS112C04IRTET replaces two legacy 8-channel ADCs due to its dual IDACs and on-chip reference, cutting channel cost by 35%. |
| Heat Meter Sensor Node | Patient Temperature Monitor |
Use Scenario: Battery-powered ultrasonic heat meter measuring forward/reverse flow via differential pressure and inlet/outlet RTDs. IC Role / Device Role / Timing Role: Simultaneous sampling of two 3-wire RTDs using matched IDACs and internal reference for ratio-metric accuracy. Use Value: Achieves <0.1°C total system error over –25°C to +85°C without factory calibration, meeting EN 1434 Class 2 requirements. | Use Scenario: Disposable clinical thermometer measuring body temperature via NTC thermistor with ultra-low power budget. IC Role / Device Role / Timing Role: Low-current (315 µA typ) ADC with integrated temperature sensor enables self-calibration and sleep-mode wake-on-event. Use Value: Enables 12-month battery life on CR2032 while maintaining ±0.1°C measurement repeatability across patient populations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS122C04IRTET | 24-bit resolution, lower max data rate (2 kSPS → 1 kSPS), higher current (350 µA → 420 µA), same pinout and feature set. | Better resolution for microvolt-level strain gauge measurements; less suitable for high-speed thermocouple scanning. | Select when 24-bit noise-free resolution is mandatory and 1-kSPS throughput suffices. |
| AD7124-4BRUZ | 4-channel, 24-bit Σ-Δ ADC with PGA, but uses SPI interface and requires external reference; no integrated temperature sensor or IDACs. | Requires additional components for RTD excitation and CJC; better for systems already using SPI and needing higher channel count density. | Choose when SPI infrastructure exists and external reference/IDAC flexibility outweighs integration benefits. |
Compared with ADS122C04IRTET and AD7124-4BRUZ, the ADS112C04IRTET uniquely balances 16-bit precision, I²C simplicity, integrated CJC, and dual IDACs - making it optimal for cost-sensitive, space-constrained, thermocouple/RTD-focused industrial nodes where 16-bit resolution meets specification.
Availability
ADS112C04IRTET is available at Aetrix Electronics and suitable for industrial field transmitters, PLC analog input modules, and heat meter sensor nodes requiring stable component supply and long-term manufacturability.
Supply support for ADS112C04IRTET 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 acquisition and industrial signal chain solutions.
The ADS112C04IRTET belongs to TI's precision delta-sigma ADC product line, engineered specifically for high-accuracy, low-power sensor signal conditioning in harsh industrial environments - emphasizing integration, EMI robustness, and simplified system design.
FAQ
What is the maximum data rate of the ADS112C04IRTET, and under what conditions is it achieved?
The ADS112C04IRTET achieves a maximum data rate of 2000 SPS in turbo mode. This occurs with PGA enabled, gain = 1, and internal reference selected. At this rate, 50/60 Hz rejection is not available; that capability is limited to 20 SPS in normal mode. The device maintains 16-bit noise-free resolution only at ≤20 SPS.
Does the ADS112C04IRTET support K-type thermocouple measurements with cold-junction compensation?
Yes, the ADS112C04IRTET supports K-type thermocouple measurements with integrated cold-junction compensation. Its on-chip temperature sensor provides ±0.5°C accuracy from –40°C to +125°C, and the device's internal registers allow direct CJC calculation - eliminating the need for external temperature sensing components when using the ADS112C04IRTET in thermocouple applications.
What are the supply voltage requirements for the ADS112C04IRTET analog and digital domains?
The ADS112C04IRTET requires separate analog (AVDD/AVSS) and digital (DVDD/DGND) supplies. Both domains operate from 2.3 V to 5.5 V. AVSS and DGND may be tied together at a single ground plane, but best practice is to separate analog and digital grounds and connect them at a single point near the device. Decoupling capacitors (≥100 nF) are required on each supply rail.
Can the ADS112C04IRTET drive resistive bridge sensors directly, and what excitation options are available?
Yes, the ADS112C04IRTET can drive resistive bridge sensors directly using its dual programmable current sources (IDACs). Each IDAC delivers 10 µA to 1.5 mA with ±1% accuracy and <2% matching. These support 2-wire, 3-wire, and 4-wire configurations - enabling ratiometric measurements with bridge sensors while minimizing offset drift and self-heating errors.
Is the ADS112C04IRTET pin-compatible with other devices in the ADS112x family?
Yes, the ADS112C04IRTET is pin-compatible with the ADS112C04 (same WQFN-16 package), ADS122C04IRTET, and ADS122C04 - all share identical pin functions and layout. However, register maps and default configurations differ; firmware must be adapted for resolution, data rate, and feature enablement differences between 16-bit and 24-bit variants.
ADS112C04IRTET 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:
- I2C
- 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:
- -
ADS112C04IRTET FAQ
1.How can I place an order for ADS112C04IRTET through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS112C04IRTET 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 ADS112C04IRTET reliable?
The price and inventory of ADS112C04IRTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS112C04IRTET is usually 5 days.
3.What payment methods are accepted for ADS112C04IRTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS112C04IRTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS112C04IRTET?
ADS112C04IRTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS112C04IRTET 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 ADS112C04IRTET?
For technical support, including ADS112C04IRTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS112C04IRTET requirements.
6.How does Aetrix verify that ADS112C04IRTET is sourced from the original manufacturer or authorized distributors?
All ADS112C04IRTET 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 ADS112C04IRTET meets industry standards.
7.What is the process for return or replacement of ADS112C04IRTET?
All ADS112C04IRTET units undergo pre-shipment inspection (PSI). If there is an issue with ADS112C04IRTET, 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 ADS112C04IRTET part is unused and in its original packaging.
Return procedure for ADS112C04IRTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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