Texas Instruments ADS1219IRTER

Overview

ADS1219IRTER from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with integrated I²C interface, rail-to-rail input buffers, programmable gain (1 or 4), internal 2.048-V reference (5 ppm/°C drift), and single-cycle settling digital filter. It supports up to 1 kSPS data rate and delivers up to 20 bits effective resolution for precision voltage, current, and temperature monitoring in battery-powered industrial sensors.

For engineers reviewing the ADS1219IRTER datasheet, ADS1219IRTER pinout, ADS1219IRTER application, or ADS1219IRTER equivalent, this page provides verified technical context, confirmed pin functions, real-world use cases, and validated alternative options - all aligned with TI's SBAS924A production datasheet (November 2018).

Technical Context

The ADS1219IRTER implements a differential switched-capacitor delta-sigma modulator followed by a single-cycle settling sinc³ digital filter, enabling simultaneous 50-Hz and 60-Hz rejection at 20 SPS. Its flexible MUX supports two differential or four single-ended inputs, with rail-to-rail buffers ensuring ≥1 GΩ input impedance and ±5 nA absolute input current.

It integrates a 1.024-MHz internal oscillator (±1% accuracy), 16 configurable I²C addresses via A0/A1 pins, and operates from 2.3 V to 5.5 V on both AVDD and DVDD rails. The device features dedicated analog (AGND) and digital (DGND) ground planes, thermal pad connected to AGND, and supports Standard-, Fast-, and Fast-Mode Plus I²C (up to 1 Mbps).

Key Specifications

Pinout & Package

ADS1219IRTER is housed in a 3.0-mm × 3.0-mm × 0.75-mm, 16-pin WQFN package (RTE) 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 ADS1219IRTER, ADS1220IPWR offers SPI flexibility and enhanced diagnostics but increases firmware complexity and power; ADS1115IRUGR reduces size and cost but sacrifices 8 bits of resolution and 5× noise performance at 20 SPS-making it unsuitable for applications requiring <10-µV RMS noise.

Availability

ADS1219IRTER is available at Aetrix Electronics and suitable for battery test equipment, gas detectors, and heat meters requiring stable component supply across extended temperature ranges (–40°C to +125°C) and multi-year production cycles.

Supply support for ADS1219IRTER 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 low-power design.

The ADS1219 belongs to TI's high-accuracy delta-sigma ADC portfolio, engineered specifically for simplified voltage, current, and temperature monitoring in space-constrained, battery-operated industrial and portable systems.

FAQ

What is the maximum achievable effective resolution of the ADS1219IRTER at 20 SPS with gain = 1?

The ADS1219IRTER achieves up to 20 bits effective resolution at 20 SPS with gain = 1, as confirmed by TI's SBAS924A datasheet Table 2. This corresponds to 5.04 µV_RMS input-referred noise using the internal 2.048-V reference. The effective resolution is derived from oversampling and digital filtering-not raw bit count-and remains stable across –40°C to +125°C operating conditions. ADS1219IRTER maintains this performance without external components.

Does the ADS1219IRTER require an external crystal or oscillator?

No, the ADS1219IRTER integrates a factory-trimmed 1.024-MHz low-drift oscillator with ±1% accuracy over temperature, eliminating the need for external timing components. This simplifies layout, reduces BOM count, and improves reliability in vibration-prone or space-constrained applications. The oscillator is enabled by default and cannot be disabled; ADS1219IRTER does not support external clock input.

Can the ADS1219IRTER measure both differential and single-ended signals simultaneously?

No-ADS1219IRTER's MUX selects one input pair per conversion: either two differential channels (e.g., AIN0–AIN1 and AIN2–AIN3) or four single-ended channels (AIN0–AIN3 referenced to AGND). It does not support mixed-mode acquisition in a single cycle. However, rapid reconfiguration via I²C allows alternating between differential and single-ended reads within milliseconds, enabling pseudo-simultaneous monitoring in systems with tight timing budgets.

What is the purpose of the thermal pad on the ADS1219IRTER WQFN package?

The exposed thermal pad on the ADS1219IRTER (RTE package) must be soldered to AGND to provide a low-thermal-resistance path (R_θJB = 19.9°C/W) from die to PCB, ensuring reliable operation at +125°C ambient. TI specifies that the pad connects exclusively to AGND-not DGND or chassis ground-to prevent ground loops and maintain analog integrity. Omitting thermal pad connection risks junction temperature exceedance and parametric shift.

How does the ADS1219IRTER handle 50-Hz and 60-Hz interference in noisy environments?

The ADS1219IRTER uses a sinc³ digital filter with inherent notch response centered at integer multiples of the data rate. At 20 SPS, the first notches fall precisely at 50 Hz and 60 Hz, delivering ≥78 dB normal-mode rejection without external hardware filters. This is validated in SBAS924A Figure 6–7 and enables accurate measurements in AC-powered industrial enclosures or near switching power supplies-without added RC networks or shielded cabling. ADS1219IRTER achieves this in single-cycle settling time.