Texas Instruments ADS1231REF

Overview

ADS1231REF from Texas Instruments is an evaluation and reference design platform built around the ADS1231 24-bit delta-sigma analog-to-digital converter, optimized for high-precision weigh-scale digitization. It integrates a low-noise signal chain, load-cell excitation switching, EMI/RFI suppression, an eight-digit starburst LCD, USB interface, and firmware supporting two-point calibration, real-time RMS/peak-to-peak noise analysis, and configurable averaging - all in a battery- or wall-powered compact board.

For engineers reviewing the ADS1231REF datasheet, ADS1231REF pinout, ADS1231REF application, or ADS1231REF equivalent, this platform delivers verified system-level implementation guidance for precision load-cell measurement, ADC noise characterization, and embedded weigh-scale firmware development - with direct access to raw ADC codes, voltage-referred outputs, and ENOB calculation.

Technical Context

The ADS1231REF implements a complete delta-sigma measurement system centered on the ADS1231, which features a fixed gain of 128, programmable data rate (FAST/SLOW modes), and internal reference support. Its hardware includes dedicated load-cell header with low-side excitation switch, terminal block for stripped-wire connections, and configurable reference selection (+5VA or EXT).

Firmware v1.0.0 enables three operating modes: Scale mode (tare, calibration, unit conversion), Analysis mode (raw hex/decimal, voltage, RMS/peak-to-peak noise, ENOB), and Configuration mode (averaging count, ADC speed, calibration mass, flash-persistent settings). External clock input is supported exclusively by the ADS1231 via EXTCLK test point under 3.3V TTL/CMOS logic.

Key Specifications

Availability

ADS1231REF is available at Aetrix Electronics and suitable for precision weigh-scale development, industrial sensor evaluation, and delta-sigma ADC characterization requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for ADS1231REF 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, embedded processing, and high-precision signal-chain solutions.

The ADS1231REF belongs to TI's Precision Analog Reference Design portfolio, created to accelerate robust, production-ready implementation of high-resolution weigh-scale and bridge-sensor measurement systems using delta-sigma ADCs.

FAQ

What is the ADS1231REF designed to evaluate?

The ADS1231REF is a reference design platform built specifically to evaluate and demonstrate the ADS1231 24-bit delta-sigma ADC in high-precision weigh-scale applications. It provides full hardware integration - including load-cell interface, excitation switching, EMI suppression, LCD display, and USB connectivity - along with firmware enabling calibration, noise analysis, and real-time code/voltage monitoring. The ADS1231REF validates system-level performance, not just ADC specs.

Does the ADS1231REF support external clock input?

Yes, the ADS1231REF supports external clock input exclusively through the EXTCLK test point, but only when the ADS1231 is installed - the ADS1131 does not support this feature. The external clock must comply with 3.3V TTL or CMOS logic levels, and no firmware or hardware configuration is required; the ADS1231 automatically detects and uses the external clock source once connected.

Can the ADS1231REF be used with both 4-wire and 6-wire load cells?

Yes, the ADS1231REF supports both 4-wire and 6-wire load cells via two independent interfaces: a screw-terminal block for stripped-wire connections and a 6-pin header for pre-terminated cables. For 6-wire configurations, the header enables sense-wire feedback to the EXT reference position, improving accuracy by compensating for excitation line drops - a capability confirmed in the User's Guide schematic and layout documentation.

How is calibration data retained on the ADS1231REF?

Calibration data and all user configuration parameters - including tare weight, calibration mass, display units, averaging count, and ADC speed - can be saved to internal flash memory using the SAVE? command in Configuration mode. Once stored, these settings persist across power cycles and resets, eliminating the need to reconfigure or recalibrate the ADS1231REF after each power-up.

What measurement modes does the ADS1231REF firmware support in Analysis mode?

The ADS1231REF firmware supports four core measurement modes in Analysis mode: Raw (hex/decimal ADC codes), Voltage (autoranging, calculated using ADS1231's 128× gain and selected reference), RMS noise (input-referred, computed from standard deviation), and Peak-to-Peak noise. Each mode displays results in volts, codes, or effective bits (ENOB), with real-time calculation enabled by onboard MCU processing.