ADS1240E

Overview

The ADS1240E is a high-precision, low-noise analog-to-digital converter (ADC) manufactured by Texas Instruments. It features a 24-bit resolution and utilizes a delta-sigma architecture to achieve high accuracy in data conversion. The device integrates a programmable gain amplifier (PGA) with gains ranging from 1 to 128, allowing for flexible signal conditioning directly at the input stage. It supports multiple input configurations, including differential and pseudo-differential modes, making it suitable for bridge sensor applications. The ADC operates with a single supply voltage and includes an internal reference and oscillator, reducing external component count.

Feature Summary

• Integrates a low-noise, programmable gain amplifier to amplify weak sensor signals before digitization.
• Features an internal precision voltage reference and clock oscillator to minimize external circuit complexity.
• Supports configurable digital filter settings to optimize noise rejection and data rate for specific application needs.

Applications

• Industrial process control systems requiring high-resolution temperature measurement via RTDs or thermocouples.
• Weigh scales and force measurement instruments utilizing load cell inputs.
• Medical equipment such as ECG monitors and blood pressure analyzers needing precise biopotential signal acquisition.

Procurement Notes

Verify the specific suffix of the part number to confirm package type and temperature range. Ensure compatibility with the system's power supply requirements and interface logic levels. Confirm RoHS compliance status if required by regulatory standards. Check for obsolescence notices or lifecycle changes on the manufacturer's website before finalizing procurement plans.

Selection Notes

Select this component when high resolution and low noise are critical for small signal measurements. Consider the integrated PGA if signal amplification is needed to maximize dynamic range. Evaluate the available data rates against the required bandwidth of the measured physical quantity. Ensure the operating temperature range matches the environmental conditions of the target application.

Part Context

The ADS1240 belongs to the ADS124x family of precision ADCs designed for industrial and scientific applications. It shares architectural similarities with other devices in the series but offers specific pinout and feature combinations tailored for cost-sensitive, high-performance designs. It serves as a direct replacement for older generation ADCs in legacy systems requiring upgraded precision.

Replacement Considerations

Check for ADS1240EG4 as a lead-free variant within the same package. Verify pin compatibility with ADS1241 if additional channels are not required. Ensure substitute parts maintain the same PGA gain range and internal reference specifications.