Texas Instruments ADS1219IPW

Overview

ADS1219IPW from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) designed for precision voltage, current, and temperature monitoring in space-constrained, low-power systems. It features four single-ended or two differential inputs, programmable gain (1 or 4), 1-kSPS max data rate, internal 2.048-V reference (5 ppm/°C drift), and I²C interface with 16 configurable addresses. Used in battery test equipment and gas detectors where rail-to-rail input buffers enable direct connection to high-impedance sensors.

For engineers reviewing the ADS1219IPW datasheet, ADS1219IPW pinout, ADS1219IPW application, or ADS1219IPW equivalent, key selection criteria include its single-register configuration simplicity, simultaneous 50/60-Hz rejection at 20 SPS, 315 µA typical supply current, and WQFN-16 package compatibility with industrial–40°C to +125°C operation.

Technical Context

The ADS1219IPW integrates a delta-sigma modulator with single-cycle settling digital filter, enabling 20-bit effective resolution at 20 SPS and simultaneous 50-Hz/60-Hz line-noise rejection. Its rail-to-rail input buffers support high-impedance sources without external amplification, while the programmable gain stage (1× or 4×) optimizes dynamic range for low-level signals like thermistor or shunt-based current sensing.

It uses an internal 1.024-MHz oscillator (±1% accuracy) and supports I²C standard/fast/fast-mode-plus speeds up to 1 Mbps. The device operates from a single 2.3 V to 5.5 V supply for both analog (AVDD) and digital (DVDD) domains, with separate AGND/DGND pins and thermal pad tied to AGND for noise isolation.

Key Specifications

Pinout & Package

ADS1219IPW is packaged in a 3.0-mm × 3.0-mm × 0.75-mm WQFN-16 with exposed thermal pad (RTE package). The thermal pad must be soldered to AGND for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1220IPWR and ADS1118IRTER, the ADS1219IPW uniquely balances I²C simplicity, internal oscillator, and 24-bit resolution in a 3-mm WQFN - making it optimal for compact, battery-powered, dual-sensor monitoring where minimal external components and deterministic timing are critical.

Availability

ADS1219IPW is available at Aetrix Electronics and suitable for battery test equipment, gas detectors, and heat meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS1219IPW 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 product line targets compact, low-power system monitoring - delivering integrated signal chain solutions (MUX, buffers, PGA, reference, oscillator, I²C) to replace discrete implementations in voltage, current, and temperature sensing.

FAQ

What is the maximum data rate supported by the ADS1219IPW?

The ADS1219IPW supports four programmable data rates: 20 SPS, 90 SPS, 330 SPS, and 1000 SPS. At 1000 SPS, the device achieves single-cycle settling with 24-bit no-missing-codes resolution. Lower data rates improve noise performance - for example, 5.04 µV_RMS input-referred noise at 20 SPS with gain = 1. The ADS1219IPW maintains full functionality across its entire data rate range without requiring reconfiguration of the internal filter.

Does the ADS1219IPW require an external crystal or clock source?

No, the ADS1219IPW does not require an external crystal or clock source. It integrates a low-drift 1.024-MHz internal oscillator with ±1% accuracy over temperature and supply voltage. This oscillator drives the delta-sigma modulator and digital filter, enabling fully autonomous operation. The internal clock eliminates BOM cost and layout area associated with external timing components, and is explicitly validated for use with all supported data rates and gain settings in the ADS1219IPW datasheet.

How many I²C addresses can be configured on the ADS1219IPW?

The ADS1219IPW supports 16 unique I²C slave addresses, selected using the A0 and A1 pins. Each pin accepts logic high or low, yielding four combinations; combined with the fixed 4-bit base address (1001b), this produces 16 distinct 7-bit addresses (0x48–0x4F and 0x90–0x97). This capability allows up to 16 ADS1219IPW devices on a single I²C bus without address collision - essential for multi-sensor nodes in industrial monitoring systems.

What is the purpose of the DRDY pin on the ADS1219IPW?

DRDY (Data Ready) is an active-low, open-drain output that signals when a conversion result is available in the output register. When DRDY goes low, the host MCU can immediately read the latest 24-bit conversion value via I²C without polling or timeout delays. This interrupt-driven operation reduces CPU overhead and improves system responsiveness. The ADS1219IPW asserts DRDY synchronously with conversion completion - even in continuous mode - and the pin remains asserted until the data register is read, ensuring no data loss during I²C transactions.

Can the ADS1219IPW operate with separate analog and digital supply voltages?

Yes, the ADS1219IPW supports independent analog (AVDD) and digital (DVDD) supplies ranging from 2.3 V to 5.5 V each. AVDD powers the ADC core, reference, and analog front-end; DVDD powers the I²C interface and digital logic. The datasheet specifies AVDD–DGND must remain within –0.1 V to +0.1 V to maintain proper level-shifting, and recommends connecting AGND and DGND at a single point near the device. This separation enables noise isolation in mixed-signal systems - for example, powering AVDD from a clean LDO while DVDD connects to a noisier system rail.