ADS1115 16 bits ADC 4 Channel with Programmable Gain Amplifier
For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1115 provides 16-bit precision at 860 samples / second over I2C. The chip can be configured as 4 single-ended input channels or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost the smallest individual/differential signals to full range. We like this ADC because it can run from 2V to 5V power/logic, can measure a wide range of signals, and is super easy to use. It is a great general-purpose 16-bit converter.
The chip is quite small so it comes on a breakout board with ferrites to keep the AVDD and AGND quiet. The interconnection is done through I2C. The address can be changed to one of four options (see the datasheet table 5) so you can have up to 4 ads1115s connected on a single 2-wire I2C bus for 16 single-ended inputs.
- Wide supply range: 2.0V to 5.5V
- Low current consumption: continuous mode: only 150A single-shot mode: automatic power off
- Programmable data rate: 8SPS to 860SPS
- The internal low drift voltage reference
- Internal oscillator
- Inside the PGA
- I2C interface: selectable addresses
- Four single-ended or two-ended differential inputs
- Programmable comparator
- This board/chip uses 7-bit I2C addresses between 0x48-0x4B, selectable with jumpers.