Texas Instruments ADS1110A5IDBVR

Overview

ADS1110A5IDBVR 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 ±0.01% INL, 15–240 SPS data rate, and 240 µA active current for precision low-power sensing. Used in portable instrumentation and smart transmitters for differential voltage measurement up to ±2.048V.

For engineers reviewing the ADS1110A5IDBVR datasheet, ADS1110A5IDBVR pinout, ADS1110A5IDBVR application, or ADS1110A5IDBVR equivalent, key selection criteria include onboard reference accuracy (±0.05%), PGA gain options (1–8), self-calibration behavior, I²C address (1001101), and −40°C to +85°C operating range.

Technical Context

The ADS1110A5IDBVR implements a fully differential delta-sigma modulator with digital filtering, continuous self-calibration, and fixed 2.048V internal reference-no external reference support. Its I²C interface operates in Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes with 7-bit slave address 1001101.

Conversion modes include continuous and single-cycle operation; the ST/DRDY bit indicates data readiness or conversion status. Input impedance varies with PGA setting (e.g., 2.8 MΩ at PGA=1, 0.35 MΩ at PGA=8), and aliasing mitigation requires external anti-aliasing filtering due to Sinc1 digital filter limitations.

Key Specifications

Pinout & Package

SOT23-6 package (DBV designation), 1.6 mm × 2.9 mm footprint, 1.45 mm height, 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 ADS1110A5IDBVR, ADS1115IDGSR adds channel multiplexing at the cost of board space and external reference dependency, while MCP3421A0T-E/CH offers higher resolution in identical SOT23-6 packaging but requires address compatibility verification.

Availability

ADS1110A5IDBVR is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitters requiring stable component supply, long-lifecycle availability, and RoHS-compliant SOT23-6 ADCs.

Supply support for ADS1110A5IDBVR 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 decades of precision data acquisition innovation.

The ADS1110 product line delivers ultra-small, self-contained delta-sigma ADCs for space-constrained, low-power applications where integration of reference, PGA, oscillator, and I²C interface reduces bill-of-materials and design complexity.

FAQ

What is the I²C address of the ADS1110A5IDBVR?

The ADS1110A5IDBVR has a fixed 7-bit I²C slave address of 1001101 (0x4D), determined by its A5 variant marking (ED5). This address is factory-programmed and cannot be changed. It allows up to eight ADS1110 devices-including ADS1110A0 through ADS1110A7-to coexist on the same I²C bus without address conflict, provided each uses a unique variant.

Does the ADS1110A5IDBVR support external voltage references?

No, the ADS1110A5IDBVR does not support external voltage references. It integrates a trimmed 2.048 V reference with ±0.05% initial accuracy and 5 ppm/°C drift, which is permanently used as the ADC's reference. The reference is internal-only and inaccessible to external circuitry; all conversions are ratiometric to this fixed reference, eliminating external reference components but precluding user-defined full-scale ranges.

How does the PGA setting affect input impedance in the ADS1110A5IDBVR?

In the ADS1110A5IDBVR, differential input impedance scales inversely with PGA gain: 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 driven by the internal oscillator. High-source-impedance sensors may require buffering to avoid gain error; the datasheet specifies common-mode impedance also varies with PGA (e.g., 3.5 MΩ at PGA=1, 0.9 MΩ at PGA=8).

Can the ADS1110A5IDBVR operate from a 3.3 V supply?

Yes, the ADS1110A5IDBVR operates from 2.7 V to 5.5 V, making 3.3 V fully compliant. At 3.3 V, typical active supply current is 240 µA, and power dissipation drops to ~0.675 mW. Logic thresholds scale with VDD (VIH = 0.7×VDD), so 3.3 V I²C buses interface directly without level shifting. The 2.048 V reference remains stable across this supply range, ensuring consistent full-scale input range.

What is the meaning of the ST/DRDY bit in the ADS1110A5IDBVR configuration register?

The ST/DRDY bit (bit 7) in the ADS1110A5IDBVR configuration register serves dual functions: when written, it triggers a conversion in single-cycle mode; when read, it indicates data freshness - '0' means the output register contains new, unread data, while '1' means the data has already been read. In continuous mode, ST/DRDY reflects conversion completion status and must be polled to avoid reading stale values. The bit resets automatically upon output register read.