Texas Instruments ADS1100A1IDBVT

Overview

ADS1100A1IDBVT 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, consumes only 90 µA active current, and targets precision low-power measurement systems.

For engineers reviewing the ADS1100A1IDBVT datasheet, ADS1100A1IDBVT pinout, ADS1100A1IDBVT application, or ADS1100A1IDBVT equivalent, key selection considerations include its factory-set I²C address (1001001), guaranteed no-missing-codes performance at 16-bit resolution, continuous self-calibration eliminating system-level offset/gain drift compensation, and suitability for battery-powered sensor interfaces requiring <100 µA quiescent current.

Technical Context

The ADS1100A1IDBVT implements a fully differential delta-sigma modulator with integrated digital filter and internal system clock (nominal 275 kHz), enabling single-cycle conversion without external timing components. Its ratiometric architecture ties full-scale range directly to VDD/PGA, making it inherently insensitive to supply voltage drift when used with stable references.

Input impedance is gain-dependent: differential impedance = 2.4 MΩ/PGA, common-mode = 8 MΩ. The device supports Standard/Fast/High-Speed I²C modes up to 3.4 MHz and features automatic power-down after each conversion in single-shot mode, reducing idle current to 0.05 µA.

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 2.9 mm × 1.6 mm × 1.15 mm, surface-mount, 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 ADS1100A1IDBVT, ADS1115IDGSR offers channel multiplexing and faster sampling but increases board area and calibration complexity, while MCP3421A0T-E/CH delivers higher resolution at lower speed and sacrifices PGA flexibility-making ADS1100A1IDBVT optimal for compact, self-contained, low-power differential sensor nodes.

Availability

ADS1100A1IDBVT is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ADS1100A1IDBVT 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision data acquisition.

The ADS1100 product line was designed specifically for ultra-low-power, space-constrained applications demanding high-resolution analog sensing without external calibration infrastructure or complex support circuitry.

FAQ

What is the factory-configured I²C address of the ADS1100A1IDBVT?

The ADS1100A1IDBVT has a fixed 7-bit I²C slave address of 1001001 (0x49 in hexadecimal), corresponding to the "A1" variant per TI's ordering table. This address is laser-trimmed at wafer test and cannot be modified. When connecting multiple ADS1100 variants on one bus, ADS1100A1IDBVT will respond only to commands sent to 0x49, avoiding conflicts with other addresses like 0x48 (A0) or 0x4A (A2). The ADS1100A1IDBVT uses standard I²C protocol with ACK/NACK handshaking and supports repeated start conditions.

How does the ADS1100A1IDBVT achieve continuous self-calibration without user intervention?

The ADS1100A1IDBVT integrates dedicated on-chip calibration circuitry that automatically executes offset and gain correction during idle periods between conversions. This process requires no host MCU interaction, command sequence, or external components. The self-calibration updates internal correction coefficients continuously, ensuring that published specifications-including ±0.0125% INL and ±5 mV/PGA offset error-are maintained across temperature and time. Unlike systems requiring periodic manual recalibration, the ADS1100A1IDBVT guarantees these parameters remain valid throughout its rated –40°C to +85°C operating range without firmware overhead.

Can the ADS1100A1IDBVT measure bipolar differential input signals?

Yes, the ADS1100A1IDBVT accepts true bipolar differential inputs (VIN+ – VIN–), producing signed two's complement output codes ranging from –32,768 to +32,767 at 16-bit resolution. However, both VIN+ and VIN– pins must remain within the absolute voltage limits of GND – 0.2 V to VDD + 0.2 V. For example, with VDD = 3.3 V, valid input common-mode range is 0 V to 3.3 V, and differential swing can be ±1.65 V centered at 1.65 V. The device does not support inputs below GND or above VDD-external level-shifting is required for signals outside this window.

What is the minimum supply voltage required for full 16-bit performance of the ADS1100A1IDBVT?

The ADS1100A1IDBVT maintains full 16-bit resolution with no missing codes down to 2.7 V supply voltage, as confirmed in the Electrical Characteristics table under "ANALOG INPUT" and "SYSTEM PERFORMANCE" sections. At VDD = 2.7 V and PGA = 1, full-scale input voltage is ±2.7 V, and integral nonlinearity remains ≤±0.0125% of FSR. Performance metrics including noise (4 µV_P-P), offset drift (≤2 µV/°C at PGA=8), and supply current (90 µA) are all specified across the entire 2.7–5.5 V range, making ADS1100A1IDBVT fully functional in 3.0 V and 3.3 V systems without derating.

Does the ADS1100A1IDBVT require external anti-aliasing filtering?

Yes, the ADS1100A1IDBVT requires external anti-aliasing filtering for input signals containing frequency content above half the selected data rate (e.g., >4 Hz for 8 SPS mode). While its internal sinc1 digital filter provides some high-frequency attenuation, it cannot fully suppress aliasing from broadband noise or interference. A simple RC filter-such as 10 kΩ series resistor and 10 µF capacitor-placed before VIN+/VIN– provides adequate suppression for most sensor applications. Input impedance interaction must be considered: at PGA = 1, differential input impedance is ~2.4 MΩ, so RC values should be chosen to avoid significant signal attenuation or settling-time degradation.