Texas Instruments ADS1100A2IDBVR

Overview

ADS1100A2IDBVR from Texas Instruments is a self-calibrating, 16-bit delta-sigma analog-to-digital converter with differential inputs, I²C interface, programmable gain amplifier (PGA = 1/2/4/8), and 8–128 SPS data rate in SOT23-6 package. It operates ratiometrically using VDD as reference, supports single- or continuous-conversion modes, and achieves ±0.0125% FSR INL at 16-bit resolution. It is used in portable instrumentation for high-resolution, low-power sensor signal digitization.

For engineers reviewing the ADS1100A2IDBVR datasheet, ADS1100A2IDBVR pinout, ADS1100A2IDBVR application, or ADS1100A2IDBVR equivalent, key selection considerations include its fixed I²C address (1001010), PGA-configurable input range (±VDD/PGA), low 90 µA active current, 4 µV_P-P noise floor, and SOT23-6 footprint suitability for space-constrained industrial and portable designs.

Technical Context

The ADS1100A2IDBVR 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 VDD and PGA setting, enabling stable measurements without precision voltage references.

It features continuous on-chip self-calibration of offset and gain errors-no user intervention required-and supports two operating modes: single-conversion (auto power-down post-read) and continuous conversion. The I²C interface operates at Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes, with SCL as input-only and SDA bidirectional.

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 1.6 mm × 2.9 mm × 1.15 mm body, gull-wing leads, moisture sensitivity level 1. Pin 1 marked by dot or beveled edge; marking "AD2" indicates I²C address 1001010.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1115IDGSR and MCP3424-E/ST, the ADS1100A2IDBVR offers smallest footprint (SOT23-6), lowest active current (90 µA), and autonomous calibration - making it optimal for single-input, space- and power-constrained industrial sensor nodes where VDD stability suffices for accuracy.

Availability

ADS1100A2IDBVR is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS1100A2IDBVR 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision data acquisition and industrial-grade signal chain solutions.

The ADS1100 product line was designed for ultra-compact, low-power, high-resolution sensor interfacing in space-constrained industrial and portable equipment - emphasizing integration, self-calibration, and ease of use over configurability.

FAQ

What is the I²C address of the ADS1100A2IDBVR?

The ADS1100A2IDBVR has a fixed 7-bit I²C slave address of 1001010 (0x4A), determined by factory-set address pins. This allows eight ADS1100 variants (A0–A7) to share the same I²C bus without address conflict. The ADS1100A2IDBVR specifically corresponds to the "AD2" marking on the device body and is distinct from other variants like ADS1100A0IDBVR (0x48) or ADS1100A7IDBVR (0x4F). No external address configuration is possible.

Does the ADS1100A2IDBVR require an external voltage reference?

No, the ADS1100A2IDBVR uses its VDD supply as the reference voltage in a ratiometric configuration - full-scale range equals ±VDD/PGA. This eliminates the need for an external precision reference, reducing BOM cost and board area. However, VDD stability directly affects measurement accuracy; a well-bypassed, low-noise 2.7–5.5 V supply is required. The ADS1100A2IDBVR does not support external reference inputs.

How does the programmable gain amplifier (PGA) affect input range in the ADS1100A2IDBVR?

The PGA in the ADS1100A2IDBVR scales the differential input voltage before digitization, with selectable gains of 1, 2, 4, or 8. Full-scale input range is ±VDD/PGA - for example, at VDD = 5.0 V and PGA = 8, the usable input span is ±625 mV. Higher gain increases resolution for small signals but reduces maximum measurable voltage. Gain is configured via bits PGA1/PGA0 in the ADS1100A2IDBVR's configuration register (default = 1×).

What is the maximum achievable effective resolution of the ADS1100A2IDBVR?

The ADS1100A2IDBVR guarantees 16-bit resolution with no missing codes at its slowest data rate (8 SPS). At higher rates (16/32/128 SPS), resolution decreases to 15/14/12 bits respectively, per the datasheet's bit-depth vs. data-rate mapping. Effective resolution also depends on noise: its 4 µV_P-P noise floor at 8 SPS supports ~15.3 ENOB (effective number of bits) when oversampled and filtered. The ADS1100A2IDBVR does not support digital averaging beyond its native output register width.

Can the ADS1100A2IDBVR operate from a 3.3 V supply?

Yes, the ADS1100A2IDBVR is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V logic supplies. At VDD = 3.3 V, full-scale range at PGA = 1 is ±3.3 V differential, and supply current remains 90 µA typical. All electrical characteristics - INL, offset error, noise, and I²C timing - are validated across this range. The device's ratiometric nature means accuracy scales with VDD stability, not absolute voltage level.