Texas Instruments ADS1131REF

Overview

ADS1131REF from Texas Instruments is an evaluation and reference design platform built around the ADS1131 18-bit delta-sigma ADC, optimized for weigh-scale digitizer applications. It integrates a load-cell interface with low-side excitation switching, EMI/RFI suppression, an 8-digit starburst LCD, USB firmware update capability, and dual power options (9V battery or 6–9V AC adapter). The board supports two operating modes-Scale mode for calibrated mass measurement and Analysis mode for raw ADC code inspection, RMS noise calculation, and real-time voltage display.

For engineers reviewing the ADS1131REF datasheet, ADS1131REF pinout, ADS1131REF application, or ADS1131REF equivalent, this page delivers verified hardware context, confirmed functional specifications, exact firmware capabilities (v1.0.0), supported load-cell configurations (4-/6-wire), and validated alternative reference designs for precision weigh-scale system development.

Technical Context

The ADS1131REF implements a complete weigh-scale digitizer system using the ADS1131 18-bit delta-sigma ADC with fixed gain of 64 and internal oscillator. It features dedicated analog front-end circuitry including switched low-side excitation for load cells, reference-select switch (+5VA or EXT), and input shorting jumpers (J7/J8) for noise testing. The MCU handles real-time signal processing, calibration math, and display control.

Hardware operation is governed by three distinct modes: Scale mode (tare, calibration, SI/avoirdupois mass display), Analysis mode (raw hex/decimal/voltage, RMS/peak-to-peak noise, ENOB estimation), and Configuration mode (adjustable averaging count, ADC speed, calibration mass, unit selection, flash-persistent parameter storage).

Key Specifications

Availability

ADS1131REF is available at Aetrix Electronics and suitable for weigh-scale digitizer development, precision sensor evaluation, and delta-sigma ADC validation requiring stable component supply, repeatable calibration workflows, and low-power portable instrumentation.

Supply support for ADS1131REF 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and sensor signal chains.

The ADS1131REF belongs to TI's Precision Analog Reference Design portfolio, created to accelerate development of high-accuracy weigh-scale and bridge-sensor measurement systems using integrated delta-sigma ADCs.

FAQ

What is the primary function of the ADS1131REF?

The ADS1131REF is a Texas Instruments reference design platform built around the ADS1131 18-bit delta-sigma ADC. Its primary function is to serve as a fully implemented weigh-scale digitizer system-providing calibrated mass measurement, real-time noise analysis, and flexible configuration for load-cell interfacing. The ADS1131REF enables rapid prototyping and validation of precision analog front-ends without custom PCB design.

Does the ADS1131REF support both 4-wire and 6-wire load cells?

Yes, the ADS1131REF supports both 4-wire and 6-wire load cells via two independent interfaces: a terminal block for stripped-wire connections and a header connector with switched low-side excitation. For 4-wire configurations, the reference select switch must be set to +5VA; for 6-wire header connections, the EXT position is recommended for optimal performance using sense-wire referencing.

Can the ADS1131REF operate on battery power?

Yes, the ADS1131REF operates on a standard 9V battery or a 6–9V AC wall adapter (tip-positive). When both are connected, the board automatically selects the AC adapter. It includes polarity-reversal protection-reversed connection causes blank display but no damage if disconnected within seconds. Battery operation enables portable, low-power weigh-scale evaluation.

What firmware capabilities does the ADS1131REF include?

The ADS1131REF ships with firmware v1.0.0 featuring weigh-scale mode with tare and two-point calibration, real-time RMS and peak-to-peak noise calculation, adjustable averaging (2–128 samples), autoranging voltage display (nV to V), raw hex/decimal code output, and flash-memory storage of all parameters-including calibration constants, units, and ADC settings-for retention across power cycles.

How does the ADS1131REF differ from the ADS1231REF?

The ADS1131REF integrates the 18-bit ADS1131 ADC with fixed 64× gain, while the ADS1231REF uses the 24-bit ADS1231 with 128× gain and external clock support. Both share identical hardware architecture, firmware, LCD, USB interface, and mechanical layout-but differ in resolution, noise floor, gain, and clock flexibility. The ADS1131REF targets mid-precision applications where 18-bit resolution and lower cost are prioritized over ultra-low-noise 24-bit performance.