ADS1115 16-Bit ADC Module
16-bit 4-channel analog-to-digital converter module with programmable gain amplifier (PGA, up to 16x). I2C interface, 860 SPS max. Ideal for precision analog measurements.
$6.99
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Specifications
Components
Ultra-small 16-bit precision analog-to-digital converter with internal programmable gain amplifier and I2C interface
Bus Interfaces
Overview
The ADS1115 is a breakout module for the Texas Instruments ADS1115, a high-precision 16-bit analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA). It provides four single-ended or two differential analog input channels over an I2C interface, making it perfect for adding precision analog measurement capability to microcontrollers with limited or low-resolution built-in ADCs.
Key Features
- 16-bit resolution: Much higher precision than typical 10-bit or 12-bit MCU ADCs
- 4 channels: Four single-ended or two differential input channels
- Programmable gain amplifier: 2/3x to 16x gain for measuring small signals
- I2C interface: Up to 4 modules on one bus (4 selectable addresses)
- Internal comparator: Alert pin for threshold monitoring
- Low power: 150 µA continuous, 0.5 µA power-down
- Wide voltage: 2V to 5.5V compatible
Specifications
| Parameter | Value |
|---|---|
| Resolution | 16-bit (signed, 15-bit effective) |
| Channels | 4 single-ended or 2 differential |
| Sample rate | 8 to 860 SPS (programmable) |
| PGA gain settings | ±6.144V, ±4.096V, ±2.048V, ±1.024V, ±0.512V, ±0.256V |
| I2C addresses | 0x48, 0x49, 0x4A, 0x4B (selectable via ADDR pin) |
| Supply voltage | 2V–5.5V |
| Operating current | 150 µA (continuous), 0.5 µA (power-down) |
| Input impedance | 6 MΩ |
PGA Full-Scale Range
| Gain | Full-Scale Range | LSB Size |
|---|---|---|
| 2/3x | ±6.144V | 187.5 µV |
| 1x | ±4.096V | 125 µV |
| 2x | ±2.048V | 62.5 µV |
| 4x | ±1.024V | 31.25 µV |
| 8x | ±0.512V | 15.625 µV |
| 16x | ±0.256V | 7.8125 µV |
Getting Started
Connect VDD, GND, SDA, and SCL to your microcontroller. The ADDR pin sets the I2C address (connect to GND for 0x48). The ALERT/RDY pin can be used for conversion-ready interrupts. Use the Adafruit ADS1x15 library for Arduino or the ads1x15 MicroPython driver.
Applications
- Precision voltage and current measurement
- Multi-channel sensor data acquisition
- Load cell and strain gauge reading
- Thermocouple amplification
- Battery voltage monitoring
- Audio-level ADC for signal analysis
Use Cases
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Where to Buy
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