ADS1115 16-Bit 4-Channel ADC Module with Programmable Gain Amplifier (PGA)

The ADS1115 16-Bit 4-Channel ADC Module is a precision, low-power analog-to-digital converter breakout board designed to expand the analog input capabilities of Arduino, Raspberry Pi, ESP32, and other microcontrollers. Featuring a 16-bit resolution, 4 single-ended or 2 differential input channels, and a built-in Programmable Gain Amplifier (PGA) up to 16x, this module delivers far superior measurement accuracy compared to standard 10-bit onboard ADCs. With an I2C interface, pin-selectable addresses, and a wide 2.0V to 5.5V supply range, it is the ideal choice for high-precision sensor data acquisition, battery monitoring, temperature measurement, and portable instrumentation projects.

Key Features

• 16-bit high-resolution analog-to-digital conversion
• 4 single-ended or 2 differential input channels
• Built-in Programmable Gain Amplifier (PGA) up to 16x
• Wide supply voltage range: 2.0V to 5.5V
• 3.3V and 5V logic compatible
• Programmable data rate: 8 SPS to 860 SPS
• Single-shot or continuous conversion modes
• Internal low-drift voltage reference and oscillator
• Built-in programmable comparator with ALERT output
• Four pin-selectable I2C addresses (0x48 to 0x4B)
• Ultra-low power consumption: 150µA in continuous mode
• Compact breakout board with breadboard-friendly headers

Technical Specifications

Applications

• Arduino and Raspberry Pi analog sensor interfacing
• High-precision voltage and current monitoring
• Battery voltage and charge level measurement
• Temperature sensor data acquisition (thermocouples, RTDs)
• Load cell and strain gauge signal conditioning
• Portable instrumentation and dataloggers
• Factory automation and process control
• Consumer electronics and IoT sensor nodes
• DIY electronics and embedded systems projects

Important Notes

• Do not exceed VDD + 0.3V on any analog input — exceeding this will damage the chip. Use external clamping diodes if necessary.
• When using PGA settings above VDD (e.g., ±6.144V with 3.3V supply), the full-scale code range above VDD is unused; actual maximum measurable voltage is limited to VDD.
• Connect ADDR pin to GND, VDD, SDA, or SCL to select one of four I2C addresses. Default is 0x48 if left floating (internal 10K pull-down).
• In single-ended mode, resolution is effectively 15-bit (one bit used for sign). Use differential mode for full 16-bit resolution.
• Both differential inputs must remain positive relative to GND; differential mode measures relative difference, not negative ground-referenced voltages.
• Install a 0.1µF decoupling capacitor close to VDD and GND pins for stable operation.
• Store in anti-static packaging when not in use to prevent ESD damage.