ADS1115 16-Bit ADC- 4 Channel with Programmable Gain Amplifier

ADS1115 I2C 16Bit 4-channel ADC Module with Programmable Gain Amplifier is a high-precision, low-power analog-to-digital converter that provides 16 bits of resolution over the I2C interface. This module allows developers to expand the analog capabilities of microcontrollers like the Raspberry Pi or Arduino, which often lack high-resolution or sufficient analog inputs. Furthermore, the integrated Programmable Gain Amplifier (PGA) enables the device to boost small signals, ensuring you can measure even the slightest voltage fluctuations with extreme accuracy. Consequently, this module effectively replaces low-resolution internal ADCs in demanding sensor applications. Therefore, the ADS1115 stands as an essential tool for any project requiring reliable, high-fidelity analog data acquisition.

Key Features:

• 16-Bit Resolution: Provides high-precision conversion, allowing the system to detect very small changes in analog input levels.
• Programmable Gain Amplifier (PGA): Offers input ranges from ±256 mV to ±6.144 V, which allows for the measurement of both large and small signals.
• 4-Channel Input: Configures as four single-ended inputs or two differential inputs depending on your specific circuit requirements.
• Low Current Consumption: Operates at only 150 μA in continuous mode, making it perfect for battery-powered portable electronics.
• I2C Interface: Utilizes a simple two-wire interface with four pin-selectable addresses, so you can connect multiple modules to a single bus.

Technical Specifications:

• Supply Voltage Range: 2.0 V to 5.5 V
• Continuous Current Consumption: 150 μA (Typical)
• Programmable Data Rate: 8 SPS to 860 SPS (Samples Per Second)
• Internal Voltage Reference: Low-drift integrated reference
• Interface Type: I2C Serial (Standard, Fast, and High-Speed modes)
• Operating Temperature: −40°C to +125°C

Mechanical Specifications:

• Module Type: Breakout Board with 0.1 inch (2.54 mm) pin headers
• Mounting: Through-hole soldering for headers or direct PCB mounting
• Communication Pins: Dedicated SDA and SCL pins with pull-up resistor support
• Construction: High-quality PCB with gold-plated finish for improved conductivity

Dimensions:

• Board Length: ≈ 28.0 mm
• Board Width: ≈ 17.0 mm
• Header Height: ≈ 11.0 mm (standard)
• Weight: ≈ 2.5 g

Pinout and Wiring:

• VDD: Connect to the positive power supply (2.0 V to 5.5 V).
• GND: Connect to the common system ground.
• SCL: I2C Clock line; connect to the SCL pin of your microcontroller.
• SDA: I2C Data line; connect to the SDA pin of your microcontroller.
• ADDR: Address pin; tie to GND (0x48), VDD (0x49), SDA (0x4A), or SCL (0x4B) to set the I2C address.
• ALRT: Digital comparator output or conversion ready signal.
• A0, A1, A2, A3: Analog input channels. However, ensure input voltages do not exceed VDD + 0.3 V to prevent damage.

Datasheet Reference:

• Download Texas Instruments ADS1115 Datasheet

Commonly Used in:

• Microcontroller Expansion: Adding high-resolution analog inputs to Raspberry Pi, ESP8266, and ESP32 boards.
• Precision Instrumentation: Developing digital voltmeters and multimeters that require fine resolution.
• Sensor Hubs: Interfacing multiple analog sensors, such as gas or light sensors, to a digital bus.

Applications:

• Battery Monitoring: Measuring cell voltages accurately to determine state-of-charge in lithium batteries.
• Process Control: Interfacing with industrial sensors that output small voltage ranges (e.g., thermocouples).
• Audio Signal Analysis: Sampling low-frequency analog audio signals for basic spectrum analysis.

Equivalent Models:

• ADS1015: A 12-bit version of the same chip, providing faster sampling rates at the cost of lower resolution.
• MCP3424: An 18-bit multi-channel Delta-Sigma ADC that also uses the I2C interface.
• ADS1113/ADS1114: Single and dual-channel variations of the ADS1115 family with similar 16-bit performance.

Package Includes:

• 1 x ADS1115 I2C 16Bit 4-channel ADC Module
• 1 x 10-Pin Male Header Strip