Texas Instruments ADS1100A3IDBVR

Overview

ADS1100A3IDBVR 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 the supply voltage as reference and achieves ±0.0125% FSR INL at 16-bit resolution. It targets precision low-power sensing in portable instrumentation and industrial transmitters.

For engineers reviewing the ADS1100A3IDBVR datasheet, ADS1100A3IDBVR pinout, ADS1100A3IDBVR application, or ADS1100A3IDBVR equivalent, key selection factors include its factory-programmed I²C address (1001011), continuous self-calibration, 4µV_P-P noise floor, 90µA active current, and SOT23-6 footprint compatibility with space-constrained PCB layouts.

Technical Context

The ADS1100A3IDBVR 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: FSR = ±VDD/PGA.

Input impedance is gain-dependent - differential impedance = 2.4 MΩ/PGA, common-mode = 8 MΩ - requiring low-impedance sources or buffering for accuracy. The device supports only slave-mode I²C communication (no master capability) and accepts Standard/Fast/High-Speed mode clocks up to 3.4 MHz.

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 1.6 mm × 2.9 mm × 1.15 mm body, gull-wing leads, thermal pad not present. RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the ADS1100A3IDBVR delivers optimal balance of 16-bit performance, ultra-small footprint, lowest active current, and integrated PGA - making it uniquely suited for single-sensor, battery-powered, space-limited measurement nodes.

Availability

ADS1100A3IDBVR is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for ADS1100A3IDBVR 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability, application-optimized ICs.

The ADS1100 product line delivers ultra-compact, self-calibrating delta-sigma ADCs designed specifically for low-power, high-accuracy sensing in space- and energy-constrained systems - emphasizing ease of integration and long-term stability without external calibration.

FAQ

What is the I²C address of the ADS1100A3IDBVR?

The ADS1100A3IDBVR has a factory-programmed 7-bit I²C address of 1001011 (0x4B). This address is hardwired and cannot be changed. It enables plug-and-play integration into multi-device I²C buses without address collision, unlike variants such as ADS1100A0IDBVR (0x48) or ADS1100A7IDBVR (0x4F). The ADS1100A3IDBVR responds only to this specific address during read/write operations.

Does the ADS1100A3IDBVR require an external reference voltage?

No, the ADS1100A3IDBVR uses a ratiometric architecture with VDD as its internal reference. Full-scale range equals ±VDD/PGA, so accuracy tracks supply variations - eliminating need for external precision references. This simplifies BOM and layout while maintaining measurement integrity in systems with well-regulated supplies. The ADS1100A3IDBVR does not accept or utilize any external reference pin.

How does the PGA affect input voltage range in the ADS1100A3IDBVR?

In the ADS1100A3IDBVR, the PGA gain directly scales the usable differential input range: at PGA = 1, full-scale is ±VDD; at PGA = 8, full-scale narrows to ±VDD/8. For example, with VDD = 5 V, PGA = 8 yields ±625 mV input range - enabling high-resolution digitization of millivolt-level signals like thermocouples without external amplification. The PGA is configured via bits PGA[1:0] in the configuration register.

Can the ADS1100A3IDBVR operate from a 2.7 V supply?

Yes, the ADS1100A3IDBVR is fully specified for operation from 2.7 V to 5.5 V. At 2.7 V, it maintains 16-bit resolution (at 8 SPS), ±0.0125% FSR INL, and 90 µA typical supply current. Input voltage limits scale accordingly: VIN+, VIN− must remain within GND – 0.2 V to VDD + 0.2 V (i.e., –0.2 V to +2.9 V). This makes the ADS1100A3IDBVR suitable for single-cell Li-ion or alkaline-powered devices.

What is the purpose of the ST/BSY bit in the ADS1100A3IDBVR configuration register?

The ST/BSY bit (bit 7) in the ADS1100A3IDBVR configuration register serves dual functions: when written in single-conversion mode, setting it to 1 triggers one ADC conversion; when read, it indicates busy status (1 = conversion in progress, 0 = result ready). In continuous mode, ST/BSY is always read as 1 and writing to it has no effect. This bit enables precise software synchronization without polling delay or external interrupt lines.