SparkFun
Qwiic 24-Bit 4-Channel ADC Breakout - ADS1219
· MPN: SEN-27544
When the ADC built into your microcontroller is not precise enough, this Qwiic breakout adds a high-resolution Texas Instruments ADS1219 for measuring very s...
When the ADC built into your microcontroller is not precise enough, this Qwiic breakout adds a high-resolution Texas Instruments ADS1219 for measuring very small analogue voltage changes.
The board provides four channels of 24-bit analogue input, which can be used as four single-ended inputs or configured for differential measurements. A programmable gain amplifier with x1 and x4 settings helps with tiny signals from sources such as strain gauges and scientific sensors.
Connection is simple through the Qwiic Connect System, so you can add it to a compatible I2C project without soldering. For breadboard use or external references, the analogue inputs, interrupt and reference pins are also broken out to standard 0.1"-spaced pads. Documentation includes a schematic, board dimensions, ADS1219 datasheet, hookup guide, Arduino library and hardware repository.
Features:
- High-resolution ADC: Built around the Texas Instruments ADS1219
- Analogue channels: Four channels of high-resolution analogue input
- Input configuration: Configurable as four single-ended inputs or two differential pairs
- Programmable gain amplifier: x1 and x4 gain settings
- Fine measurement: Precision down to 61.04 nV per count
- Qwiic Connect System: Connects to a microcontroller in seconds with no soldering required
- Daisy-chain support: Up to 16 boards on a single bus for 64 channels of ADC input
- Breadboard-friendly pads: Analogue inputs, interrupts and reference pins broken out to standard 0.1"-spaced pads
Specifications:
- IC: ADS1219
- Operating Voltage (VDD): 2.3V - 5.5V
- Qwiic cable operating voltage note: When powering with a Qwiic cable, the operating voltage is 3.3V only
- Operating Temperature: -40°C to 125°C
- Operation Modes: Single-Shot, Continuous-Conversion, and Power-Down
- Analog Inputs: Four single-ended
- Differential input configuration: Can be configured as one or two differential inputs
- Reference voltage inputs: Separate reference voltage inputs
- VDDA (AVDD): can also be configured via the jumper and breakout pad
- Resolution: 24-bit maximum, 20-bit effective
- LSB size (gain x1): 244.14nV
- LSB size (gain x4): 61.04nV
- Sample Rate: 20 Hz to 1 kHz
- Combined Current Consumption (Typical): 8μA - 410μA
- Noise rejection: 50Hz and 60Hz noise rejection
- Input multiplexer: Configurable input multiplexer
- Configurable I2C addresses: Sixteen
- I2C address range: 0x40 - 0x4F
- Default I2C address: 0x40
- Qwiic connection ports: 2x
- Power LED: configurable
- Dimensions: 1" x 1"
A handy precision ADC board for Qwiic projects, sensor interfaces, data logging and experiments that need more resolution than a typical microcontroller ADC.
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- Differential input
- A measurement method where the board reads the voltage difference between two input wires instead of measuring one wire compared with ground. This is useful for small sensor signals and noise reduction, but both input voltages still need to stay within the board’s allowed range.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- LSB
- Least significant bit is the smallest step a digital converter can represent. In a DAC, it tells you the tiniest voltage change the output can make at a given resolution and output range.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
- programmable gain
- An adjustable amplification setting inside the ADC that makes small input signals larger before they are measured. It matters because choosing the right gain helps use more of the ADC’s range without overloading the input.
- Programmable gain amplifier
- A built-in amplifier whose gain can be changed in software to make small input signals easier to measure. This matters because choosing the right gain can improve detail for small sensors, but too much gain can make the input range too small.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
Find this product in
Sensors & Input
Qwiic 24-Bit 4-Channel ADC Breakout Schematic
Schematic · 154.0 KB · Click any page to view full size
ADS1219 Datasheet
Datasheet · 2.1 MB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 1.7 MB · Click any page to view full size
