Texas Instruments ADS1110A5IDBVT

Overview

ADS1110A5IDBVT from Texas Instruments is a 16-bit delta-sigma analog-to-digital converter with integrated 2.048V reference, programmable gain amplifier (PGA), and I²C interface in SOT23-6 package. It delivers ±2.048V differential input range, 15–240 SPS programmable data rate, and continuous self-calibration for precision measurement in space-constrained systems such as portable instrumentation and smart transmitters.

For engineers reviewing the ADS1110A5IDBVT datasheet, ADS1110A5IDBVT pinout, ADS1110A5IDBVT application, or ADS1110A5IDBVT equivalent, key selection considerations include its fixed I²C address (1001101), −40°C to +85°C operating temperature, 240 µA active current, onboard oscillator (no external clock support), and PGA gain options (1/2/4/8) affecting input impedance and offset error.

Technical Context

The ADS1110A5IDBVT implements a fully differential delta-sigma modulator with digital filtering, using an internal 2.048V reference that cannot be bypassed or replaced. Its self-calibration circuitry operates continuously without user intervention and corrects both offset and gain errors across temperature and supply voltage variations.

I²C communication uses standard/fast/high-speed modes up to 3.4 MHz, with address 1001101 (A5 variant), and supports only slave operation. The device offers two operating modes-continuous conversion and single-shot-with ST/DRDY bit indicating data readiness or conversion completion, and configuration register bits controlling data rate (15/30/60/240 SPS) and PGA gain (1–8).

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 1.6 mm × 2.9 mm × 1.15 mm body, 0.95 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1110A5IDBVT, ADS1115IRUGR adds channel multiplexing but increases board area and power; MCP3421A0T-E/CH delivers 2 extra bits and finer gain steps at identical package size, making it a direct upgrade path where resolution and flexibility outweigh cost sensitivity.

Availability

ADS1110A5IDBVT is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for ADS1110A5IDBVT 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 low-power signal chain solutions.

The ADS1110 product line was designed specifically for ultra-compact, low-power, high-accuracy measurement in battery-operated and space-constrained systems - targeting applications where integration, reliability, and ease of use outweigh raw speed or channel count.

FAQ

What is the I²C address of the ADS1110A5IDBVT?

The ADS1110A5IDBVT has a fixed 7-bit I²C address of 1001101 (0x4D), corresponding to the A5 variant in the ADS1110 family. This address is factory-programmed and cannot be changed. Up to eight ADS1110 devices with unique addresses (A0–A7) can share one I²C bus, enabling scalable multi-sensor designs without address conflicts. The ADS1110A5IDBVT responds only to this address during read/write operations.

Does the ADS1110A5IDBVT support external reference voltage?

No, the ADS1110A5IDBVT does not support external reference voltage. It integrates a trimmed 2.048V reference with ±0.05% initial accuracy and 5 ppm/°C drift, which is permanently used as the conversion reference. The reference is not accessible at any pin and cannot be bypassed, disconnected, or overridden. All specifications - including INL, offset error, and gain error - are referenced to this internal source, eliminating external reference design variables but fixing the full-scale range to ±2.048V differentially.

How does the PGA setting affect input impedance in the ADS1110A5IDBVT?

In the ADS1110A5IDBVT, differential input impedance scales inversely with PGA gain: it is approximately 2.8 MΩ at PGA = 1, 1.4 MΩ at PGA = 2, 0.7 MΩ at PGA = 4, and 0.35 MΩ at PGA = 8. This behavior arises from the switched-capacitor input stage whose effective resistance depends on modulation frequency and capacitor values tied to PGA configuration. High-impedance sensors (>10 kΩ) may require buffering when PGA > 1 to avoid gain error and settling-time degradation, especially at higher data rates.

Can the ADS1110A5IDBVT operate with a 3.3V supply?

Yes, the ADS1110A5IDBVT operates reliably from 2.7V to 5.5V, making 3.3V a fully supported and commonly used supply voltage. At 3.3V, typical active supply current is 240 µA, power dissipation is ~0.675 mW, and logic thresholds remain valid (VIH = 2.31V min, VIL = 0.99V max). The internal 2.048V reference remains stable across this range, and I²C timing parameters comply with standard/fast-mode specifications. No level-shifting is needed for 3.3V microcontrollers.

What is the purpose of the ST/DRDY bit in the ADS1110A5IDBVT configuration register?

The ST/DRDY bit (bit 7) in the ADS1110A5IDBVT configuration register serves dual functions: when written, it triggers a single conversion in single-shot mode; when read, it indicates data freshness - 0 means the output register contains new, unread data, and 1 means the data has already been read or conversion is still in progress. In continuous mode, ST/DRDY reflects readiness of the latest conversion result. This bit eliminates polling delays and race conditions, enabling efficient, deterministic host firmware interaction with the ADS1110A5IDBVT without requiring timer-based waits.