Texas Instruments ADS1241EG4

Overview

ADS1241EG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with simultaneous 50Hz/60Hz rejection (≥–90dB), 0.0015% INL, and programmable PGA gains from 1 to 128. It features eight analog input/data I/O pins, on-chip offset DAC, SPI-compatible serial interface, and operates from 2.7V to 5.25V - designed for high-precision sensor measurement in industrial weigh scales and chromatography systems.

For engineers reviewing the ADS1241EG4 datasheet, ADS1241EG4 pinout, ADS1241EG4 application, or ADS1241EG4 equivalent, key selection criteria include its 21-bit effective resolution at PGA=1, differential reference support (0.1V–5V), single-cycle settling filter, burnout current sources for open/short sensor detection, and SSOP-28 package compatibility with AIN0–AIN7 multiplexed inputs.

Technical Context

The ADS1241EG4 employs a 2nd-order delta-sigma modulator with a 1279-tap FIR digital filter enabling simultaneous 50Hz and 60Hz notch rejection at selectable data rates (3.75Hz/7.5Hz/15Hz). Its internal programmable gain amplifier (PGA) supports eight discrete gain settings (1–128), and the input buffer provides ≥5GΩ impedance when enabled.

Calibration is supported via self-calibration (SELFCAL/SELFGCAL/SELFOCAL) and system calibration (SYSOCAL/SYSGCAL), requiring no external components. The device uses an external differential voltage reference (VREF+ / VREF–), accepts up to eight single-ended or four differential input channels, and integrates burnout current sources (2µA each) for sensor health monitoring.

Key Specifications

Pinout & Package

ADS1241EG4 is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.64 mm pitch, moisture sensitivity level 3, and RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1240IPWR, ADS1241EG4 provides four additional analog/data I/O pins for sensor expansion or GPIO reuse; compared with AD7195BRUZ, it offers lower power and greater I/O flexibility but requires external reference and excitation circuitry.

Availability

ADS1241EG4 is available at Aetrix Electronics and suitable for industrial process control, weigh scales, and portable instrumentation requiring stable component supply and long-term manufacturability.

Supply support for ADS1241EG4 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 converters and industrial-grade ICs.

The ADS124x family was engineered for high-resolution, low-drift sensor measurement in harsh environments - targeting smart transmitters, analytical instruments, and portable test equipment where accuracy, noise immunity, and reliability are critical.

FAQ

What is the maximum sampling rate of the ADS1241EG4?

The ADS1241EG4 supports programmable output data rates of 3.75Hz, 7.5Hz, and 15Hz - selected via the SPEED and DR bits in the SETUP register. At 15Hz, it achieves simultaneous 50Hz and 60Hz rejection ≥–90dB. Higher master clock frequencies (e.g., 4.9152MHz) shift these rates proportionally but maintain notch alignment. The ADS1241EG4 does not support continuous streaming above 15Hz while preserving its specified AC-line rejection performance.

Does the ADS1241EG4 require an external crystal or oscillator?

Yes, the ADS1241EG4 requires an external clock source - either a crystal (e.g., 2.4576MHz or 4.9152MHz), ceramic resonator, or CMOS oscillator - connected between XIN and XOUT. The device contains no internal oscillator. Crystal startup and stability depend on proper load capacitance (0–20pF per pin), as specified in TI's SBAS173F datasheet. Using an inaccurate or unstable clock directly degrades timing-dependent specifications like 50/60Hz rejection.

How does the burnout current feature work on the ADS1241EG4?

The ADS1241EG4 integrates two 2µA burnout current sources - one connected to AIN+ and one to AIN– - activated via the BOCS bit in the SETUP register. When enabled, an open-circuited sensor pulls AIN+ to AVDD and AIN– to AGND, producing full-scale output (0x7FFFFF). A shorted sensor forces both inputs to the same potential, yielding near-zero output. This allows automated sensor health verification before each measurement cycle without external components.

Can the ADS1241EG4 operate with a 3.3V analog supply?

Yes, the ADS1241EG4 supports AVDD from 2.7V to 5.25V. At AVDD = 3.3V, the reference input range is 0.1V–1.25V (RANGE = 0) or 0.1V–2.5V (RANGE = 1), and the analog input range (buffer ON) becomes AGND + 0.05V to AVDD – 1.5V (i.e., 0.05V to 1.8V). Performance remains within datasheet specs: 24-bit no missing codes, ±0.0015% INL, and ≥–90dB 50/60Hz rejection are all guaranteed across the full –40°C to +85°C temperature range at 3.3V.

Is the ADS1241EG4 pin-compatible with the ADS1240?

No, the ADS1241EG4 is not pin-compatible with the ADS1240. The ADS1241EG4 uses a 28-pin SSOP package with AIN4/D4 through AIN7/D7 on pins 13–16 and AIN2/D2 through AIN3/D3 on pins 17–18, whereas the ADS1240 uses a 24-pin SSOP with only AIN0/D0 through AIN3/D3. Pin assignments for shared signals (e.g., VREF+, DRDY, SCLK) also differ in position. PCB layout must be redesigned when migrating between these variants.