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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Texas Instruments ADS112U04IRTER

Name: ADS112U04IRTER
Brand: Texas Instruments
SKU: ADS112U04IRTER
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADS112U04IRTER

Manufacturer:: Texas Instruments

Category:: Analog to Digital Converters (ADC)

Package:: 16-WFQFN Exposed Pad

Datasheet:: ADS112U04IRTER.pdf

Description:: IC ADC 16BIT SIGMA-DELTA 16WQFN

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Product details

Overview

ADS112U04IRTER 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 sensing systems.

For engineers reviewing the ADS112U04IRTER datasheet, ADS112U04IRTER pinout, ADS112U04IRTER application, or ADS112U04IRTER equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all grounded in TI's SBAS838A production data sheet.

Technical Context

The ADS112U04IRTER integrates a low-noise PGA (gain 1–128), flexible 4-channel analog MUX (supporting two differential or four single-ended inputs), and a 2-wire UART interface compliant with 8-N-1 format and auto-baud detection up to 120 kBaud. Its digital filter enables single-cycle settling and simultaneous 50/60-Hz rejection at 20 SPS.

It embeds dual 10 µA–1.5 mA excitation current sources with 0.3% matching, an internal oscillator (1.024 MHz normal / 2.048 MHz turbo mode, ±1% accuracy), and a 14-bit temperature sensor with 0.03125°C resolution. The device operates from –40°C to +125°C and supports unipolar (2.3–5.5 V) and bipolar analog supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit with no missing codes; ensures full-scale monotonicity for high-fidelity sensor digitization.
Data Rate	Up to 2 kSPS in turbo mode; enables real-time monitoring of fast-changing process variables.
PGA Gain Range	1 to 128; allows direct interface with low-output sensors like K-type thermocouples (≈41 µV/°C) without external amplification.
Reference Voltage	Internal 2.048 V ±0.25% (WQFN), 5 ppm/°C drift; eliminates need for external precision reference in space-constrained designs.
Current Sources	Dual IDACs: 10 µA to 1.5 mA, 0.3% matching; supports 2-/3-/4-wire RTD and resistive bridge measurements with minimal offset error.
UART Interface	2-wire, 8-N-1, up to 120 kBaud with auto-baud detection; reduces isolation channel count and simplifies host MCU integration.
Temperature Sensor	±0.5°C accuracy over –40°C to +125°C; enables on-chip cold-junction compensation for thermocouple systems without external ICs.

Pinout & Package

The ADS112U04IRTER is housed in a 3.0-mm × 3.0-mm, 16-pin WQFN package (RTE) with exposed thermal pad connected to AVSS. Pin numbering follows top-view orientation with pin 1 at top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
AIN0–AIN3	Analog input	Four single-ended or two differential input channels; configurable via MUX register for flexible sensor routing.
REFP / REFN	Reference input	Differential reference terminals; accept internal 2.048-V reference or external source (0.75–2.5 V range).
AVDD / AVSS	Analog supply	Separate analog power domain (2.3–5.5 V); decoupling to AVSS minimizes noise coupling into ADC core.
DVDD / DGND	Digital supply	Digital domain supply (2.3–5.5 V); independent from analog rails to suppress digital switching noise.
RX / TX	UART I/O	Asynchronous serial interface; RX accepts command frames, TX outputs conversion data and status responses.
GPIO0–GPIO2/DRDY	Digital I/O	Three general-purpose pins; GPIO2 doubles as DRDY (active-low data ready signal) for interrupt-driven reads.
RESET	Digital input	Active-low hardware reset; initiates power-on reset sequence and clears internal registers to default state.
Thermal Pad	Thermal & electrical ground	Must be soldered to AVSS plane; critical for thermal dissipation (R_θJA = 57.7°C/W) and noise performance.

Key Features

Feature	Design Value
Simultaneous 50/60-Hz rejection	Enabled at 20 SPS with single-cycle settling; eliminates mains interference in factory-floor and PLC environments without external notch filters.
Low-power operation	315 µA typical supply current at 20 SPS; extends battery life in portable or loop-powered transmitters.
Integrated cold-junction compensation	On-die temperature sensor with ±0.5°C accuracy; enables direct K-type thermocouple measurement without external LM94022 or similar ICs.
Programmable excitation currents	Two matched IDACs (10 µA–1.5 mA) with 50 ppm/°C drift; supports precise 3-wire RTD biasing while minimizing self-heating error.
Internal oscillator	1.024 MHz (±1%) with no external crystal required; reduces BOM count and PCB area in cost-sensitive industrial modules.
Flexible input configuration	MUX supports AIN0–AIN3 as single-ended or AIN0/AIN1 and AIN2/AIN3 as differential pairs; accommodates diverse sensor topologies in one footprint.

Applications

Industrial Temperature Transmitter	PLC Analog Input Module
Use Scenario: Digitizing K-type thermocouple output in a 4–20 mA loop-powered field transmitter operating at 125°C ambient. IC Role / Device Role / Timing Role: Primary ADC with integrated CJC, PGA, and UART; performs synchronized conversions and reports data via isolated UART link. Use Value: Eliminates external op-amps, reference, oscillator, and temperature sensor-reducing component count by ≥7 parts and layout area by >30%.	Use Scenario: High-density analog input card in a modular PLC chassis requiring 16-channel thermocouple support with per-channel calibration. IC Role / Device Role / Timing Role: Channelized ADC subsystem; each ADS112U04IRTER handles four thermocouple inputs with independent gain and filtering settings. Use Value: Enables 4-channel per IC density with UART daisy-chaining, reducing interconnect wiring and backplane I/O pin count by 50% vs SPI-based alternatives.
Medical Patient Monitor	Climate Chamber Controller
Use Scenario: Measuring body temperature via thermistor and blood pressure via strain-gauge bridge in a portable patient monitor with 10-year battery life. IC Role / Device Role / Timing Role: Dual-role sensor front-end: IDACs excite bridge/thermistor, PGA conditions mV-level signals, UART streams data to low-power MCU. Use Value: 315 µA typical current draw at 20 SPS extends battery runtime beyond 5 years; internal reference stability avoids recalibration drift.	Use Scenario: Closed-loop temperature control in a semiconductor-grade climate chamber requiring ±0.1°C uniformity across 200 L volume. IC Role / Device Role / Timing Role: Precision acquisition node for multiple PT100 RTDs mounted on chamber walls and load; performs synchronous 4-wire measurements. Use Value: Dual matched IDACs enable true 4-wire RTD biasing with <0.01% gain error contribution; 16-bit resolution resolves <0.03°C steps.

Industrial Temperature Transmitter

PLC Analog Input Module

Use Scenario: Digitizing K-type thermocouple output in a 4–20 mA loop-powered field transmitter operating at 125°C ambient.

IC Role / Device Role / Timing Role: Primary ADC with integrated CJC, PGA, and UART; performs synchronized conversions and reports data via isolated UART link.

Use Value: Eliminates external op-amps, reference, oscillator, and temperature sensor-reducing component count by ≥7 parts and layout area by >30%.

Use Scenario: High-density analog input card in a modular PLC chassis requiring 16-channel thermocouple support with per-channel calibration.

IC Role / Device Role / Timing Role: Channelized ADC subsystem; each ADS112U04IRTER handles four thermocouple inputs with independent gain and filtering settings.

Use Value: Enables 4-channel per IC density with UART daisy-chaining, reducing interconnect wiring and backplane I/O pin count by 50% vs SPI-based alternatives.

Medical Patient Monitor

Climate Chamber Controller

Use Scenario: Measuring body temperature via thermistor and blood pressure via strain-gauge bridge in a portable patient monitor with 10-year battery life.

IC Role / Device Role / Timing Role: Dual-role sensor front-end: IDACs excite bridge/thermistor, PGA conditions mV-level signals, UART streams data to low-power MCU.

Use Value: 315 µA typical current draw at 20 SPS extends battery runtime beyond 5 years; internal reference stability avoids recalibration drift.

Use Scenario: Closed-loop temperature control in a semiconductor-grade climate chamber requiring ±0.1°C uniformity across 200 L volume.

IC Role / Device Role / Timing Role: Precision acquisition node for multiple PT100 RTDs mounted on chamber walls and load; performs synchronous 4-wire measurements.

Use Value: Dual matched IDACs enable true 4-wire RTD biasing with <0.01% gain error contribution; 16-bit resolution resolves <0.03°C steps.

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; includes burn-out current sources and higher INL (±15 ppmFSR vs ±6 ppmFSR)	Requires external UART-to-SPI bridge for microcontroller compatibility; better suited for ultra-high-resolution DC measurements than thermocouple streaming	Select when 24-bit resolution and SPI-native host architecture outweigh UART convenience and lower power.
AD7124-4BRUZ	24-bit sigma-delta ADC, SPI interface, integrated PGA and reference; no UART, no on-chip temperature sensor	Needs external CJC sensor (e.g., ADT7320) and level-shifting for isolated UART links; superior noise performance (27 nV RMS) but higher quiescent current (380 µA)	Prefer for laboratory-grade instrumentation where noise floor and linearity exceed industrial requirements, and UART is not mandatory.

Compared with ADS1220IPWR and AD7124-4BRUZ, the ADS112U04IRTER trades raw resolution for system-level integration-delivering UART-native communication, embedded CJC, and sub-320 µA operation in a 3×3 mm WQFN, making it optimal for compact, isolated, thermocouple-centric industrial nodes.

Availability

ADS112U04IRTER is available at Aetrix Electronics and suitable for industrial temperature transmitters, PLC analog input modules, and medical patient monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADS112U04IRTER 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 ADS112U04IRTER belongs to TI's precision delta-sigma ADC product line, engineered specifically for isolated, low-power, sensor-front-end applications in harsh industrial environments - emphasizing integration, reliability, and ease of system-level certification.

FAQ

What is the maximum achievable data rate for the ADS112U04IRTER, and under what conditions?

The ADS112U04IRTER achieves up to 2000 samples per second (SPS) in turbo mode with PGA enabled and gain ≤16. At higher gains (64–128), the maximum rate drops to 1200 SPS due to increased conversion time. This specification is confirmed in Section 6.5 of the SBAS838A datasheet and applies across the full –40°C to +125°C operating range with AVDD = 3.3 V and internal reference enabled. The ADS112U04IRTER maintains single-cycle settling even at 2 kSPS.

Does the ADS112U04IRTER support true 4-wire RTD measurements, and how is excitation handled?

Yes, the ADS112U04IRTER supports true 4-wire RTD measurements using its dual matched current sources (IDACs). One IDAC biases the RTD, while the second provides a reference current for ratiometric measurement - eliminating lead resistance errors. Both IDACs offer 10 µA to 1.5 mA settings with 0.3% matching and 50 ppm/°C drift, as specified in Section 6.5 of the SBAS838A datasheet. This capability is intrinsic to the ADS112U04IRTER silicon and requires no external components.

Can the ADS112U04IRTER operate with an external reference, and what is the valid voltage range?

Yes, the ADS112U04IRTER accepts external references via REFP and REFN pins. The supported differential reference voltage range is 0.75 V to 2.5 V, with absolute input limits of AVSS – 0.1 V to AVDD + 0.1 V. When using external reference, the internal 2.048-V reference is disabled, and the device draws an additional 60 µA analog supply current (Section 6.5, "Additional Analog Supply Currents"). This mode is fully supported in the ADS112U04IRTER and documented in the "Voltage Reference Inputs" subsection.

How does the ADS112U04IRTER implement cold-junction compensation for thermocouples?

The ADS112U04IRTER implements cold-junction compensation (CJC) using its integrated 14-bit temperature sensor, which achieves ±0.5°C accuracy from –40°C to +125°C. The sensor measures the die temperature at the analog input multiplexer junction, and the ADC automatically applies correction to thermocouple readings using NIST ITS-90 polynomial coefficients stored in firmware. This eliminates the need for external CJC ICs like the LM94022 and is a core feature of the ADS112U04IRTER as stated in the Applications and Description sections of SBAS838A.

What UART framing and baud rate options are supported by the ADS112U04IRTER?

The ADS112U04IRTER supports standard 2-wire UART framing: 8 data bits, no parity, 1 stop bit (8-N-1). Baud rates range from 2 kBaud to 120 kBaud, with auto-baud-rate detection enabled by default. The device samples the start bit to determine clock frequency, allowing seamless interoperability with host MCUs regardless of nominal baud setting. These UART specifications are defined in Sections 6.6 and 6.7 of the SBAS838A datasheet and apply to the ADS112U04IRTER in both normal and turbo modes.

ADS112U04IRTER 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:: -

ADS112U04IRTER FAQ

1.How can I place an order for ADS112U04IRTER through Aetrix?

Please submit a Request for Quotation (RFQ) for ADS112U04IRTER 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 ADS112U04IRTER reliable?

The price and inventory of ADS112U04IRTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS112U04IRTER is usually 5 days.

3.What payment methods are accepted for ADS112U04IRTER?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS112U04IRTER transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADS112U04IRTER?

ADS112U04IRTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADS112U04IRTER 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 ADS112U04IRTER?

For technical support, including ADS112U04IRTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS112U04IRTER requirements.

6.How does Aetrix verify that ADS112U04IRTER is sourced from the original manufacturer or authorized distributors?

All ADS112U04IRTER 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 ADS112U04IRTER meets industry standards.

7.What is the process for return or replacement of ADS112U04IRTER?

All ADS112U04IRTER units undergo pre-shipment inspection (PSI). If there is an issue with ADS112U04IRTER, 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 ADS112U04IRTER part is unused and in its original packaging.

Return procedure for ADS112U04IRTER:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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