Texas Instruments ADS1100A2IDBVTG4

Overview

ADS1100A2IDBVTG4 from Texas Instruments is a self-calibrating, 16-bit delta-sigma analog-to-digital converter with differential inputs, I²C interface, programmable gain amplifier (gain = 1/2/4/8), and 8–128 SPS data rate in SOT23-6 package. It operates ratiometrically using the supply as reference, draws only 90 µA active current, and targets high-resolution sensor measurement in space-constrained systems.

For engineers reviewing the ADS1100A2IDBVTG4 datasheet, ADS1100A2IDBVTG4 pinout, ADS1100A2IDBVTG4 application, or ADS1100A2IDBVTG4 equivalent, key selection considerations include its fixed I²C address (1001010), PGA-configurable input range, continuous self-calibration, low-noise 4 µV_P-P performance, and single-supply operation from 2.7 V to 5.5 V.

Technical Context

The ADS1100A2IDBVTG4 implements a fully differential delta-sigma modulator with integrated digital filter and internal system clock (~275 kHz), eliminating external timing components. Its ratiometric architecture ties full-scale range directly to V_DD/PGA, enabling stable measurements without precision voltage references.

It supports two operating modes-continuous conversion and single-shot-with automatic power-down after each conversion in single mode. The I²C interface operates at Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes, and the device responds only as a slave with fixed 7-bit address 1001010 (A2 variant).

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, moisture sensitivity level 1. Pin 1 marked by dot or beveled edge; marking "AD2" confirms A2 I²C address variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision delta-sigma ADC applications.

Compared with ADS1115IRUGT and MCP3424-E/ST, the ADS1100A2IDBVTG4 delivers guaranteed monotonic 16-bit performance with zero software calibration burden in the smallest possible footprint-ideal for single-sensor, ultra-low-power, space-constrained designs where long-term stability is critical.

Availability

ADS1100A2IDBVTG4 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply with guaranteed long-term sourcing.

Supply support for ADS1100A2IDBVTG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision data converters and low-power signal chain solutions.

The ADS1100 product line was designed for high-resolution, low-power, space-constrained sensor measurement applications-including battery-operated handheld tools, industrial transmitters, and smart sensors-where self-calibration and minimal external components are essential.

FAQ

What is the I²C address of the ADS1100A2IDBVTG4?

The ADS1100A2IDBVTG4 has a fixed 7-bit I²C slave address of 1001010 (0x4A), determined by its factory-set AD2 pin configuration. This allows eight unique ADS1100 variants (A0–A7) to coexist on the same I²C bus without address collision. The ADS1100A2IDBVTG4 does not support address reconfiguration; it responds only to 0x4A read/write commands.

Does the ADS1100A2IDBVTG4 require an external voltage reference?

No, the ADS1100A2IDBVTG4 uses ratiometric conversion with V_DD as its reference voltage-no external reference is needed. Full-scale range equals ±V_DD/PGA, making measurement accuracy inherently tied to supply stability. This simplifies design, reduces BOM count, and eliminates reference drift errors, though supply regulation remains critical for high-accuracy applications.

How does the programmable gain amplifier (PGA) affect input voltage range in the ADS1100A2IDBVTG4?

The PGA in the ADS1100A2IDBVTG4 scales the differential input voltage before digitization: with gain = 1, full-scale input is ±V_DD; with gain = 8, full-scale input is ±V_DD/8. For example, at V_DD = 5 V and PGA = 8, the usable input range is ±0.625 V. This allows small sensor signals (e.g., 10 mV bridge outputs) to use the full 16-bit code range, maximizing effective resolution without external amplification.

Can the ADS1100A2IDBVTG4 operate from a 3.3 V supply?

Yes, the ADS1100A2IDBVTG4 is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V systems. At 3.3 V, its active supply current is ~90 µA (typical), power dissipation drops to ~210 µW, and full-scale range adjusts ratiometrically (e.g., ±3.3 V at PGA = 1). All electrical characteristics-including INL, noise, and CMRR-are guaranteed across this range per the datasheet.

What is the purpose of continuous self-calibration in the ADS1100A2IDBVTG4?

Continuous self-calibration in the ADS1100A2IDBVTG4 automatically corrects for offset and gain drift caused by temperature variation and time, without interrupting conversions or requiring host intervention. Unlike one-time or periodic calibration, this feature ensures that the ±0.0125% INL and ±5 mV offset error specifications remain valid over the full –40°C to +85°C operating range and product lifetime-critical for maintenance-free industrial and portable instrumentation.