Texas Instruments ADS1119IRTER

Overview

ADS1119IRTER from Texas Instruments is a 16-bit delta-sigma analog-to-digital converter with I²C interface, rail-to-rail input buffers, programmable gain (1 or 4), internal 2.048-V reference (5 ppm/°C drift), and 1-kSPS max data rate. It supports two differential or four single-ended inputs and operates from 2.3 V to 5.5 V, targeting precision voltage, current, and temperature monitoring in battery-powered industrial sensors.

For engineers reviewing the ADS1119IRTER datasheet, ADS1119IRTER pinout, ADS1119IRTER application, or ADS1119IRTER equivalent, key selection considerations include its single-register configuration simplicity, simultaneous 50/60-Hz rejection at 20 SPS, low 315-µA typical supply current, and 16 configurable I²C addresses for multi-device bus systems.

Technical Context

The ADS1119IRTER integrates a switched-capacitor delta-sigma modulator with a single-cycle settling digital filter optimized for noise rejection - delivering 16-bit noise-free resolution at 20 SPS and simultaneous 50-Hz/60-Hz rejection without external filtering. Its rail-to-rail input buffers enable direct connection of high-impedance sources like thermistors or shunt-based current sense networks.

A programmable gain stage (1× or 4×) precedes the ADC core, allowing flexible full-scale input ranges: ±2.048 V (gain = 1) or ±0.512 V (gain = 4) with internal reference. The on-chip 1.024-MHz oscillator (±1% accuracy) eliminates need for external timing components, and I²C interface supports Standard-, Fast-, and Fast-Mode Plus (up to 1 Mbps).

Key Specifications

Pinout & Package

ADS1119IRTER is packaged in a 3.0-mm × 3.0-mm × 0.75-mm WQFN-16 (RTE) package with exposed thermal pad connected to AGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1119IRTER, ADS1118IRTER sacrifices resolution and integration for lower cost and smaller footprint, while ADS122C04IPWR adds resolution and features at higher power and board area cost - making ADS1119IRTER the optimal balance for 16-bit, I²C-based, low-power industrial sensing.

Availability

ADS1119IRTER is available at Aetrix Electronics and suitable for battery test equipment, gas detectors, heat meters, optical modules, and wearable fitness trackers requiring stable component supply and long-term production continuity.

Supply support for ADS1119IRTER 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and low-power signal chains.

The ADS1119 belongs to TI's precision delta-sigma ADC product line, designed specifically for simplified, high-accuracy voltage, current, and temperature monitoring in space-constrained, battery-operated industrial and portable systems.

FAQ

What is the maximum sample rate supported by the ADS1119IRTER?

The ADS1119IRTER supports a maximum data rate of 1000 samples per second (SPS). At this rate, the device maintains 16-bit effective resolution but with reduced noise rejection capability compared to lower rates. For simultaneous 50-Hz and 60-Hz line-frequency rejection, the recommended setting is 20 SPS - where the integrated digital filter achieves single-cycle settling and strong common-mode noise attenuation. The ADS1119IRTER offers four discrete data rate options: 20, 90, 330, and 1000 SPS, all selectable via its single configuration register.

Does the ADS1119IRTER require an external reference voltage?

No, the ADS1119IRTER does not require an external reference voltage because it integrates a precise 2.048-V internal reference with 5 ppm/°C typical drift. This reference is factory-trimmed and enables fully self-contained operation for most precision sensing applications. However, the device also supports external reference inputs via REFP and REFN pins, allowing users to substitute a higher-accuracy or lower-drift reference (e.g., REF5020) when ultimate stability or ratiometric measurement against a system rail is needed. When using the internal reference, no external components are required for basic operation of the ADS1119IRTER.

How many I²C addresses can be configured on the ADS1119IRTER?

ADS1119IRTER supports 16 unique I²C slave addresses, selected using the A0 and A1 pins. Each pin accepts logic high or low, yielding four combinations; however, the device implements a 4-bit address field (bits [3:0] of the 7-bit I²C address), enabling 2⁴ = 16 distinct addresses. This allows up to 16 ADS1119IRTER devices to coexist on the same I²C bus without address collision - ideal for multi-sensor nodes or modular monitoring systems. Address configuration is static at power-on and requires no software initialization, simplifying system integration of the ADS1119IRTER.

What is the purpose of the DRDY pin on the ADS1119IRTER?

The DRDY (Data Ready) pin on the ADS1119IRTER is an active-low open-drain output that asserts when a conversion completes and valid data is available in the output register. It serves as a hardware interrupt signal to notify the host microcontroller - eliminating the need for continuous I²C polling and reducing system power consumption. The DRDY pin can be directly connected to an MCU's external interrupt input, enabling event-driven data acquisition. In continuous conversion mode, DRDY pulses at the selected data rate; in single-shot mode, it pulses once per conversion request. Pullup to DVDD is required, and the ADS1119IRTER specification confirms compatibility with standard- and fast-mode I²C timing.

Can the ADS1119IRTER measure both differential and single-ended signals?

Yes, the ADS1119IRTER supports both differential and single-ended input configurations through its integrated 4:1 analog multiplexer. It can measure two fully differential input pairs (e.g., AIN0–AIN1 and AIN2–AIN3) or four independent single-ended signals referenced to AGND (AIN0, AIN1, AIN2, AIN3). Input selection is controlled entirely via the configuration register - no external switching components are needed. The rail-to-rail input buffers ensure high input impedance (>1 GΩ) in both modes, preserving signal integrity from high-impedance sources such as thermistors or pH electrodes. This flexibility makes the ADS1119IRTER suitable for diverse sensing topologies within a single design.