SparkX Qwiic 24 Bit ADC - 4 Channel (ADS1219)

A 4-channel 24-bit ADC breakout board based on the Texas Instruments ADS1219, with Qwiic connectivity for easy I2C integration. The four analog channels can be used as single-ended inputs or configured in pairs for differential measurements, with sample rates up to 1 kHz and a programmable x1 or x4 gain amplifier.

With 16 selectable I2C addresses (0x40–0x4F), you can daisy-chain up to 16 boards on a single bus for 64 channels of ADC input. The board supports an internal 2.048V reference or external reference via REFP/REFN breakout pads. Standard 0.1"-spaced pads are provided for breadboard use alongside the Qwiic connectors.

Key Features

• ADS1219 24-Bit ADC – 20-bit effective resolution, up to 244.14 nV per count (gain x1)
• 4 Analog Channels – Single-ended or differential configuration
• Programmable Gain – x1 or x4 amplifier for high-sensitivity measurements
• Up to 1 kHz Sample Rate – Configurable from 20 Hz to 1 kHz
• 16 Selectable I2C Addresses – Stack up to 16 boards (64 channels) on one bus
• Qwiic Compatible – 2× Qwiic ports plus 0.1" breakout pads
• Flexible Reference – Internal 2.048V or external via REFP/REFN pads
• 50/60 Hz Noise Rejection – Clean readings in electrically noisy environments

Specifications

• ADC – Texas Instruments ADS1219
• Operating Voltage – 2.3–5.5V (3.3V via Qwiic)
• Resolution – 24-bit max, 20-bit effective
• LSB Size – 244.14 nV (gain x1), 61.04 nV (gain x4)
• Sample Rate – 20 Hz to 1 kHz
• Current Consumption – 8–410 µA typical
• I2C Address – 0x40 to 0x4F (default 0x40)
• Operating Temperature – -40 to +125°C
• Dimensions – 1" × 1" (25.4 × 25.4 mm)

Ideal For

• High-resolution analog measurements
• Multi-channel sensor data acquisition
• Differential voltage measurement
• Expanding analog inputs on Qwiic-based systems

Package Contents

• 1× SparkX Qwiic 24-Bit ADC – ADS1219 (4-channel)

Resources

• ADS1219 Datasheet (PDF)
• Schematic (PDF)
• Arduino Library (GitHub)
• Hardware Repository (GitHub)