Precision, low-power 16-bit analog-to-digital converter with an I2C interface, in a VSSOP-10 package. It integrates a programmable gain amplifier, voltage reference, oscillator, and a programmable digital comparator, and measures four single-ended or two differential inputs at up to 860 samples per second. An address pin gives four I2C addresses. The default high-resolution ADC bolted onto any MCU that lacks one.

Pinout

Pin	Name	Type	Function
1	ADDR	input	I2C target address select. Tie to GND, VDD, SDA, or SCL to select one of four 7-bit I2C addresses (0x48, 0x49, 0x4A, 0x4B).
2	ALERT/RDY	output	Comparator output or conversion-ready indicator (ADS1114 and ADS1115 only). Open-drain output; connect to VDD via a pullup resistor.
3	GND	power_in	Analog ground reference for the device. Connect to the system ground plane.
4	AIN0	input	Analog input 0. Single-ended input or positive/negative side of a differential pair via the input MUX. Absolute input range GND to VDD; must not exceed VDD + 0.3V.
5	AIN1	input	Analog input 1. Single-ended input or paired with AIN0 for differential measurement. Absolute input range GND to VDD.
6	AIN2	input	Analog input 2 (ADS1115 only). Single-ended input or paired with AIN3 for differential measurement. Absolute input range GND to VDD.
7	AIN3	input	Analog input 3 (ADS1115 only). Single-ended input or paired with AIN2 for differential measurement. Absolute input range GND to VDD.
8	VDD	power_in	Analog power supply, 2.0V to 5.5V. Connect a 0.1µF decoupling capacitor to GND close to the pin.
9	SDA	bidirectional	I2C serial data input/output (open-drain). Connect to VDD via a pullup resistor. Digital input voltage range GND to 5.5V.
10	SCL	input	I2C serial clock input. Connect to VDD via a pullup resistor. Supports Fast Mode (up to 400 kHz) and High-Speed Mode (up to 3.4 MHz).

Key specifications

Parameter	Value
Type	16-bit delta-sigma ADC
Inputs	4 single-ended / 2 differential
Interface	I2C (4 addresses)
Data rate	up to 860 SPS
Integrated	PGA, reference, oscillator, comparator
Supply voltage	2.0-5.5 V
Package	VSSOP-10
Body (L×W×H)	3.0 × 3.0 × 1.1 mm

Ordering variants

ADS1115IDGSR (VSSOP-10, tape & reel)
ADS1115IDGST (VSSOP-10, small reel)

CAD (KiCad official)

Symbol: Analog_ADC:ADS1115IDGS
Footprint: Package_SO:TSSOP-10_3x3mm_P0.5mm
3D model: VSSOP/TSSOP-10 (KiCad packages3D)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (57 pp, sha256 5fe00cf9509daba7, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF