Texas Instruments ADS112U04IPW

Overview

ADS112U04 from Texas Instruments is a precision 16-bit delta-sigma ADC 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 on-chip temperature sensor (±0.5°C accuracy). It supports two differential or four single-ended inputs and operates up to 2 kSPS with simultaneous 50/60-Hz rejection at 20 SPS - ideal for thermocouple and RTD measurement in industrial temperature transmitters.

For engineers reviewing the ADS112U04 datasheet, ADS112U04 pinout, ADS112U04 application, or ADS112U04 equivalent, key selection considerations include its UART-based isolation-friendly digital interface, low 315-µA typical current consumption, 16-bit noise-free resolution at 20 SPS, flexible input multiplexer, and integrated cold-junction compensation support for K-type thermocouples.

Technical Context

The ADS112U04 integrates a modulator-based delta-sigma architecture with a 256-kHz (normal) or 512-kHz (turbo) modulator clock, configurable digital filter offering single-cycle settling, and 8-N-1 UART interface supporting auto-baud detection up to 120 kBaud. Its PGA provides gains of 1–128, enabling direct connection to low-level sensors without external amplification.

It features dual 10-µA–1.5-mA excitation current sources with <2% accuracy and <2% matching, an internal oscillator with ±1% accuracy (normal mode), and a 14-bit temperature sensor used for cold-junction compensation. The device supports unipolar (2.3–5.5 V) and bipolar analog supplies, and operates across –40°C to +125°C.

Key Specifications

Pinout & Package

ADS112U04 is available in a 3.0-mm × 3.0-mm WQFN-16 (RTE) package with exposed thermal pad connected to AVSS. Pin functions are validated per TI SBAS838A datasheet Rev A (October 2018).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision ADC applications.

Compared with ADS1220IPWR and AD7124-4BRUZ, the ADS112U04 uniquely combines UART interface, on-chip temperature sensor, and matched IDACs in a compact WQFN package - making it the only single-chip solution for isolated, self-compensating thermocouple/RTD transmitters requiring minimal external components.

Availability

ADS112U04 is available at Aetrix Electronics and suitable for industrial temperature transmitters, PLC analog input modules, thermocouple measurement systems, and RTD-based temperature controllers requiring stable component supply and long-term manufacturability.

Supply support for ADS112U04 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 ADS112U04 belongs to TI's precision delta-sigma ADC product line, designed specifically for cost-sensitive, space-constrained industrial sensing applications where integrated functionality - UART, PGA, IDACs, reference, and temperature sensor - replaces multiple discrete components.

FAQ

What is the maximum sampling rate of the ADS112U04?

The ADS112U04 supports up to 2000 samples per second (2 kSPS) in turbo mode. At this rate, the device maintains 16-bit resolution with typical INL of ±6 ppmFSR. For highest noise rejection, 20 SPS is recommended - delivering simultaneous 50-Hz and 60-Hz rejection with single-cycle settling. The ADS112U04 achieves this performance without external filtering or firmware averaging.

Does the ADS112U04 support K-type thermocouple measurements out of the box?

Yes, the ADS112U04 supports K-type thermocouple measurements directly via its integrated features: the on-chip temperature sensor provides cold-junction compensation (CJC) with ±0.5°C accuracy, the PGA offers up to 128× gain for microvolt-level thermocouple outputs, and the 20-SPS filter rejects 50/60-Hz interference common in industrial settings. No external components are required for basic K-type operation.

How does the UART interface of the ADS112U04 simplify isolated system design?

The ADS112U04's 2-wire UART interface (RX/TX) reduces digital isolation requirements from ≥4 lines (e.g., SPI's SCLK/MOSI/MISO/CS) to just two channels. This cuts isolator count, board space, and power consumption - especially valuable in DIN-rail-mounted transmitters and PLC modules. Auto-baud detection further eases host MCU integration without pre-configured baud rates.

What are the supported current source values on the ADS112U04?

The ADS112U04 features two matched, programmable current sources (IDACs) with seven selectable values: 10 µA, 50 µA, 100 µA, 250 µA, 500 µA, 1000 µA, and 1500 µA. Each IDAC has ±1% accuracy and <2% matching over temperature, enabling precise 2-/3-/4-wire RTD excitation and open-circuit detection without external components.

Is the ADS112U04 compatible with both WQFN and TSSOP packages?

Yes, the ADS112U04 is offered in two orderable packages: the 3.0-mm × 3.0-mm WQFN-16 (RTE) and the 5.0-mm × 4.4-mm TSSOP-16 (PW). Both share identical electrical specifications and pinout mapping, though thermal performance differs - WQFN offers lower RθJA (57.7°C/W) due to its exposed thermal pad, while TSSOP is preferred for legacy through-hole assembly compatibility.