Texas Instruments ADS1219IPWT

Overview

ADS1219IPWT 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 ADS1219IPWT datasheet, ADS1219IPWT pinout, ADS1219IPWT application, or ADS1219IPWT equivalent, key selection criteria include its 16-pin WQFN package (3.0 mm × 3.0 mm), dual differential/four single-ended input configuration, simultaneous 50/60-Hz rejection at 20 SPS, low 315 µA typical supply current, and 16 configurable I²C addresses - all critical for space-constrained, low-power system monitoring designs.

Technical Context

The ADS1219IPWT implements a differential switched-capacitor delta-sigma modulator followed by a single-cycle settling digital filter that enables simultaneous 50-Hz and 60-Hz line-frequency rejection at 20 SPS. Its input multiplexer selects between two differential or four single-ended analog inputs (AIN0–AIN3), feeding rail-to-rail buffers that support high-impedance sources without external amplification.

A programmable gain stage (G = 1 or 4) precedes the ADC core, directly scaling full-scale range to match low-level sensor outputs. The internal 2.048-V reference (±0.04% accuracy, 5 ppm/°C typical drift) and 1.024-MHz oscillator (±1% accuracy) eliminate need for external timing or reference components in most monitoring applications.

Key Specifications

Pinout & Package

ADS1219IPWT 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. Pin count, layout, and thermal metrics (R_θJA = 57.7°C/W) are optimized for compact PCB area and efficient heat dissipation in sealed sensor modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1219IPWT, ADS1220IPWR offers higher speed and broader gain but lacks integrated timing and I²C compatibility, while ADS1115IRUGR trades resolution and filtering capability for size and cost - making ADS1219IPWT optimal for battery-powered, noise-immune 24-bit monitoring where space and simplicity are prioritized.

Availability

ADS1219IPWT is available at Aetrix Electronics and suitable for battery test equipment, gas detectors, heat meters, and optical modules requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for ADS1219IPWT 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, power management, and signal chain solutions.

The ADS1219 belongs to TI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy system monitoring - including voltage, current, and temperature sensing in portable, industrial, and utility-grade instrumentation.

FAQ

What is the maximum data rate supported by the ADS1219IPWT?

The ADS1219IPWT supports four programmable data rates: 20 SPS, 90 SPS, 330 SPS, and 1000 SPS. At 1000 SPS, it achieves single-cycle settling with up to 16.75 bits noise-free resolution (gain = 4). Higher rates trade resolution for speed - critical for selecting the right operating point in real-time monitoring systems. The ADS1219IPWT's digital filter is optimized for this range without requiring external configuration.

Does the ADS1219IPWT require an external reference voltage?

No, the ADS1219IPWT includes an internal 2.048-V reference with ±0.04% accuracy (WQFN package) and 5 ppm/°C typical drift, sufficient for most precision monitoring applications. External references (0.75 V to 2.5 V) may be used via REFP/REFN pins to improve absolute accuracy or enable ratiometric measurements - but the ADS1219IPWT operates fully functional with internal reference enabled and no external components.

How many analog input channels does the ADS1219IPWT support?

The ADS1219IPWT supports four single-ended analog inputs (AIN0–AIN3) or two differential input pairs (e.g., AIN0–AIN1 and AIN2–AIN3), selected via its integrated multiplexer. Input buffers provide rail-to-rail operation and >1 GΩ input impedance, allowing direct connection of thermistors, RTDs, or shunt resistors without signal conditioning. This flexibility makes the ADS1219IPWT ideal for multi-sensor monitoring nodes.

What I²C bus speeds does the ADS1219IPWT support?

The ADS1219IPWT supports Standard-Mode (100 kHz), Fast-Mode (400 kHz), and Fast-Mode Plus (1 MHz) I²C protocols. Its SDA/SCL pins are open-drain with Schmitt-trigger inputs and support bus capacitance up to 400 pF. With 16 configurable slave addresses (via A0/A1), the ADS1219IPWT enables robust multi-device communication on shared buses - essential for compact sensor hubs and modular instrumentation.

Is the ADS1219IPWT pin-compatible with other TI delta-sigma ADCs?

No, the ADS1219IPWT has a unique 16-pin WQFN (RTE) pinout optimized for its I²C interface, dual-domain supplies, and integrated reference. It is not pin-compatible with ADS1220 (SPI, different pin functions) or ADS1115 (10-pin X2QFN, fewer inputs). Migration requires PCB layout revision; however, register-level compatibility is limited - the ADS1219IPWT uses a single CONFIG register, unlike multi-register architectures in related devices.