ADS1231ID

Overview

The ADS1231ID is a single-channel, 24-bit sigma-delta analog-to-digital converter (ADC) manufactured by Texas Instruments. It operates within an analog and digital supply voltage range of 3 V to 5.3 V and dissipates approximately 5 mW of power. The device features a differential input structure with an internal programmable gain amplifier (PGA) offering selectable gains of 1 or 128. Data transmission occurs via a serial interface synchronized by an external clock signal ranging from 10 kHz to 1 MHz, enabling sampling rates of up to 80 samples per second. The component is housed in a 16-lead SOIC-Narrow package and supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Integrated low-noise programmable gain amplifier optimized for resistive bridge sensors
• Built-in 50 Hz and 60 Hz rejection filters for noise suppression
• Simple synchronous serial data output requiring minimal microcontroller interface lines

Applications

• Electronic weighing scales and load cell measurements
• Industrial pressure transmitters
• Material testing equipment requiring high-resolution force measurement

Procurement Notes

Verify the specific suffix 'ID' confirms the industrial temperature grade (-40°C to +85°C) and SOIC-16 package configuration against the manufacturer's current datasheet. Confirm that the external reference voltage requirements align with the system design, as the ADS1231 utilizes an external reference architecture rather than an internal bandgap. Ensure compatibility with the required SPI-compatible timing constraints for the host microcontroller.

Selection Notes

Select this component when high resolution and low drift are critical for DC sensor signals. The fixed internal gain of 128x limits flexibility compared to other ADCs, making it suitable primarily for small differential signals from bridge sensors. Consider the need for an external precision voltage reference and the availability of GPIO pins capable of generating precise clock pulses for data retrieval. Evaluate if the 80 SPS maximum update rate meets the dynamic response requirements of the application.

Part Context

The ADS1231 belongs to the ADS123x family of delta-sigma ADCs designed specifically for weigh scale and industrial process control applications. It shares architectural similarities with the ADS1230 but offers higher 24-bit resolution. The 'ID' designation distinguishes the industrial temperature variant from commercial options, ensuring reliability in harsher environmental conditions typical of factory automation and outdoor instrumentation.

Replacement Considerations

The ADS1230 serves as a lower-resolution alternative within the same family. Verify pinout compatibility before substitution, as package variations may exist. No direct cross-manufacturer equivalents are confirmed in public documentation.