Texas Instruments ADS1241E

Overview

ADS1241E from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with simultaneous 50Hz/60Hz rejection (≥–90dB), 0.0015% INL, and up to eight configurable analog input/data I/O channels. It features a programmable gain amplifier (PGA) with gains from 1 to 128, on-chip offset DAC, and SPI-compatible serial interface - designed for high-precision sensor signal acquisition in industrial weighing and chromatography systems.

For engineers reviewing the ADS1241E datasheet, ADS1241E pinout, ADS1241E application, or ADS1241E equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The ADS1241E implements a second-order delta-sigma modulator with a 1279-tap FIR digital filter, enabling single-cycle settling and simultaneous 50Hz/60Hz notch rejection at 15Hz, 7.5Hz, and 3.75Hz output data rates. Its multiplexed architecture supports up to four differential or eight single-ended inputs, with AINCOM usable as an additional channel.

It integrates a chopper-stabilized FET-input buffer (5GΩ input impedance when enabled), burnout current sources (2µA per input), and an 8-bit offset DAC for ±VREF/(2•PGA) range adjustment. Calibration support includes SELFCAL, SELFOCAL, and SYSGCAL commands - all requiring no external components.

Key Specifications

Pinout & Package

ADS1241E is housed in a 28-pin SSOP package (body width 5.3mm, lead pitch 0.65mm), optimized for compact industrial PCB layouts with thermal and EMI robustness.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.

Compared with ADS1240E and ADS1256IPWR, the ADS1241E uniquely combines eight reconfigurable analog/data pins with integrated burnout detection and simultaneous 50/60Hz rejection - making it optimal for multi-sensor industrial transmitters requiring self-diagnostics and noise immunity.

Availability

ADS1241E is available at Aetrix Electronics and suitable for industrial process control, weigh scales, liquid/gas chromatography, and portable instrumentation requiring stable component supply and long-term production continuity.

Supply support for ADS1241E 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 and embedded processing technologies, with decades of expertise in precision data acquisition and industrial signal chain solutions.

The ADS124x family was engineered specifically for high-resolution, low-drift measurement in harsh industrial environments - emphasizing noise immunity, sensor diagnostics, and integration density for smart transmitter and analytical instrument designs.

FAQ

What is the maximum number of differential input channels supported by the ADS1241E?

The ADS1241E supports up to four independent differential input channels (e.g., AIN0–AINCOM, AIN1–AINCOM, AIN2–AINCOM, AIN3–AINCOM) using its eight analog input pins and AINCOM reference. This configuration is confirmed in the device's multiplexer description and pin function table, where AINCOM serves as a dedicated common-mode node for differential pair formation.

Does the ADS1241E require an external crystal, or can it use an external clock source?

The ADS1241E accepts either a 2.4576MHz or 4.9152MHz crystal (with recommended 0–20pF load capacitors) or a direct CMOS-level external clock applied to XIN. XOUT is reserved exclusively for crystal oscillator feedback and must not be used as a clock driver for other circuitry - a requirement explicitly stated in the clock generator section of the datasheet.

How does the burnout current source function in the ADS1241E, and what failure modes does it detect?

The ADS1241E integrates two 2µA burnout current sources - one tied to each ADC input (positive and negative). When activated, an open-circuited sensor pulls the positive input to AVDD and the negative input to AGND, producing full-scale output (0x7FFFFF); a shorted sensor forces both inputs to the same potential, yielding near-zero output. This enables automated wiring integrity checks without external circuitry.

What is the role of the BUFEN pin on the ADS1241E, and how does it affect input impedance?

The BUFEN pin on the ADS1241E controls the chopper-stabilized FET-input buffer. When driven high, it raises differential input impedance from 5MΩ/PGA (buffer off) to 5GΩ (buffer on), enabling direct connection to high-impedance sensors like pH electrodes or thermocouples without signal attenuation or bias current errors.

Can the ADS1241E perform system-level calibration, and what signals are required?

Yes, the ADS1241E supports system calibration via SYSOCAL (system offset) and SYSGCAL (system gain) commands. SYSOCAL requires a true zero-differential input signal (e.g., shorted inputs); SYSGCAL requires a precise positive full-scale input. Both operations take two tDATA periods and correct for errors introduced by external components such as sensor bridges or reference buffers.