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Texas Instruments ADS1241E/1KG4
- Part No.:
- ADS1241E/1KG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS1241E/1KG4.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,409
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Product details
Overview
ADS1241E/1KG4 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 integrates a programmable gain amplifier (PGA, 1–128×), on-chip offset DAC, burnout current sources, and SPI-compatible serial interface - designed for high-precision sensor measurement in industrial weigh scales and chromatography systems.
For engineers reviewing the ADS1241E/1KG4 datasheet, ADS1241E/1KG4 pinout, ADS1241E/1KG4 application, or ADS1241E/1KG4 equivalent, key selection considerations include its 21-bit effective resolution at PGA = 1, differential reference support (0.1V–5V), single-cycle settling filter, and SSOP-28 package with dual-role AIN/DIO pins.
Technical Context
The ADS1241E/1KG4 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 multiplexed architecture supports up to four differential or eight single-ended inputs, with chopper-stabilized input buffering delivering 5GΩ impedance when enabled.
Calibration is supported via self-calibration (SELFCAL/SELFGCAL/SELFOCAL) and system calibration (SYSOCAL/SYSGCAL), requiring PGA = 1 for gain cal and zero/full-scale inputs respectively. The device uses an external differential reference and features burnout current sources (2µA each) for open/short sensor detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; guarantees monotonic output across full scale without code gaps. |
| Effective Resolution | 21 bits at PGA = 1, 19 bits at PGA = 128 - defines usable dynamic range after noise and distortion. |
| INL | ±0.0015% of full scale - limits absolute accuracy error in precision measurement applications. |
| Power Consumption | 600µW typical at 5V - enables low-power operation in portable instrumentation and battery-backed systems. |
| Data Rates | Programmable 3.75Hz / 7.5Hz / 15Hz - balances noise performance, rejection, and throughput for line-powered environments. |
| Reference Input | Differential, 0.1V–5V range - supports ratiometric sensing and flexible external reference selection. |
| Input Channels | Up to 8 analog inputs or data I/O pins (AIN0/D0 through AIN7/D7) - enables mixed-signal I/O expansion without external GPIO. |
Pinout & Package
ADS1241E/1KG4 is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, moisture sensitivity level 3, and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD, DGND (Pins 1,2,8) | Digital power supply and ground | Separate digital domain for SPI interface and control logic; requires local decoupling. |
| AVDD, AGND (Pins 17,16,20) | Analog power supply and ground | Isolated analog domain for modulator, PGA, and reference; critical for PSRR and noise immunity. |
| VREF+, VREF– (Pins 9,10) | Differential reference inputs | Defines full-scale range; supports ratiometric operation and external precision references. |
| AIN0/D0 – AIN7/D7 (Pins 11,12,13,14,17,18,25,26) | Configurable analog input / data I/O | Software-selectable function per pin; enables sensor interfacing or GPIO expansion in compact layouts. |
| AINCOM (Pin 19) | Analog input common | Reference node for single-ended measurements or differential common-mode connection. |
| BUFEN (Pin 28) | Buffer enable control | Activates high-impedance (5GΩ) chopper-stabilized input buffer for direct transducer connection. |
| SCLK, DIN, DOUT, CS, POL (Pins 22,24,25,23,18) | SPI-compatible serial interface | Full-duplex communication with Schmitt-trigger inputs; supports standard microcontroller SPI peripherals. |
| DRDY (Pin 27) | Data ready indicator | Active-low signal synchronized to conversion completion; used for interrupt-driven data capture. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50Hz/60Hz rejection | ≥–90dB at 15Hz data rate - eliminates mains interference without external notch filters in global instrumentation. |
| Single-cycle settling digital filter | Valid conversion on first sample after channel change - enables rapid multiplexed scanning without settling delay overhead. |
| On-chip burnout current sources | Two 2µA sources per channel - detects open-circuit (full-scale output) or short-circuit (near-zero output) sensor faults autonomously. |
| Programmable gain amplifier (1–128×) | Eight discrete gain steps - optimizes dynamic range for mV-level thermocouple or µV-level strain gauge signals. |
| Offset DAC with 8-bit signed control | ±½FSR offset adjustment at PGA = 1 - enables software nulling of DC offsets without external op-amps. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
Use Scenario: Monitoring pressure, temperature, and flow in PLC-based control loops with 4–20mA or HART interfaces. IC Role / Device Role / Timing Role: Primary ADC for analog sensor front-end; provides stable 24-bit digitization with built-in diagnostics. Use Value: Simultaneous 50/60Hz rejection ensures reliable readings in electrically noisy factory environments without additional filtering hardware. | Use Scenario: High-accuracy load cell readout in platform scales, hopper scales, and checkweighers. IC Role / Device Role / Timing Role: Precision sigma-delta converter with PGA and burnout detection for strain gauge conditioning. Use Value: 0.0015% INL and 21-bit ENOB enable sub-gram resolution at full scale; burnout currents verify sensor integrity before each weighing cycle. |
| Liquid/Gas Chromatography | Blood Analysis |
Use Scenario: Detector signal digitization in GC/FID or HPLC/UV systems requiring low-drift, high-SNR acquisition. IC Role / Device Role / Timing Role: Low-noise ADC for analog detector outputs; supports programmable data rates matching column elution profiles. Use Value: 600µW power and 21-bit resolution allow integration into portable or benchtop analyzers with thermal stability constraints. | Use Scenario: Electrochemical sensor readout in point-of-care blood glucose or electrolyte analyzers. IC Role / Device Role / Timing Role: Ratiometric ADC with external reference for calibrated biosensor signal conversion. Use Value: Differential reference input and on-chip offset DAC enable accurate zero-point calibration across operating temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1240E/1KG4 | 4-channel analog input (vs 8 on ADS1241); identical core ADC, PGA, filter, and calibration architecture. | Targeted at lower-channel-count systems like 4-wire RTD modules or compact sensor nodes. | Select ADS1240E/1KG4 when only four analog inputs are required and board space or BOM cost must be minimized. |
| AD7792BRUZ | 24-bit Σ-Δ ADC with 16-bit ENOB, internal reference, and 3-channel mux; lacks burnout sources and data I/O pins. | Better suited for fixed-reference, low-channel applications where integrated reference simplifies design. | Choose AD7792BRUZ when internal 1.17V reference suffices and diagnostic features like burnout detection are not required. |
Compared with ADS1240E/1KG4, the ADS1241E/1KG4 adds four extra AIN/DIO pins for expanded sensor count or GPIO flexibility; versus AD7792BRUZ, it trades internal reference convenience for superior diagnostic capability (burnout, offset DAC) and higher effective resolution (21 vs 16 bits).
Availability
ADS1241E/1KG4 is available at Aetrix Electronics and suitable for industrial process control, weigh scales, and liquid/gas chromatography requiring stable component supply and long-term manufacturability.
Supply support for ADS1241E/1KG4 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, embedded processing, and connectivity technologies with over 50 years of innovation in precision data converters.
The ADS124x family was engineered for high-resolution, low-drift sensor measurement in harsh industrial and portable medical environments - emphasizing noise immunity, self-diagnostics, and flexible signal conditioning.
FAQ
What is the maximum number of analog input channels supported by the ADS1241E/1KG4?
The ADS1241E/1KG4 supports up to eight analog input channels (AIN0/D0 through AIN7/D7), configurable as either eight single-ended inputs or four independent differential pairs. AINCOM serves as the common reference node. This exceeds the four-channel capability of the pin-compatible ADS1240E/1KG4, making ADS1241E/1KG4 ideal for multi-sensor systems like multi-point temperature arrays or multi-load-cell platforms.
Does the ADS1241E/1KG4 require an external clock source?
Yes, the ADS1241E/1KG4 requires an external clock source - either a crystal (e.g., 2.4576MHz or 4.9152MHz), ceramic resonator, or CMOS clock signal applied to the XIN pin. XOUT is used only for crystal oscillator feedback and must not drive external circuitry. The internal clock generator derives the modulator clock (fMOD) from fOSC using programmable division ratios defined by the SPEED bit in the SETUP register.
How does the burnout current feature work on the ADS1241E/1KG4?
The ADS1241E/1KG4 integrates two 2µA burnout current sources - one connected to the positive input (AINx+) and one to the negative input (AINx–) of the selected channel. When enabled via the BOCS bit in the SETUP register, these sources detect open circuits (driving inputs to AVDD/AGND → full-scale output) or shorts (equalizing inputs → near-zero output). This enables autonomous sensor health monitoring without external components, a key reliability feature in ADS1241E/1KG4 deployments.
Can the ADS1241E/1KG4 operate with a 3V analog supply?
Yes, the ADS1241E/1KG4 supports AVDD from 2.7V to 5.25V. At AVDD = 3V, specifications include 0.1V–1.25V reference range (RANGE = 0), 15ppm offset error, and analog current of 107–225µA (PGA = 1, buffer OFF). Performance remains fully specified across –40°C to +85°C, enabling use in battery-powered portable instrumentation where ADS1241E/1KG4 delivers 24-bit resolution at ultra-low voltage.
What is the purpose of the BUFEN pin on the ADS1241E/1KG4?
The BUFEN pin on the ADS1241E/1KG4 controls the chopper-stabilized differential FET-input voltage buffer. When asserted high (and BUFEN bit set in ACR), it raises input impedance from 5MΩ/PGA to 5GΩ - essential for direct connection to high-impedance sensors like pH electrodes or piezoresistive elements. Buffer activation increases current draw (e.g., ~500µA at PGA = 128), so ADS1241E/1KG4 users disable it when driving low-impedance sources to optimize power.
ADS1241E/1KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1241E/1KG4 FAQ
1.How can I place an order for ADS1241E/1KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1241E/1KG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS1241E/1KG4 reliable?
The price and inventory of ADS1241E/1KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1241E/1KG4 is usually 5 days.
3.What payment methods are accepted for ADS1241E/1KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1241E/1KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1241E/1KG4?
ADS1241E/1KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1241E/1KG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS1241E/1KG4?
For technical support, including ADS1241E/1KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1241E/1KG4 requirements.
6.How does Aetrix verify that ADS1241E/1KG4 is sourced from the original manufacturer or authorized distributors?
All ADS1241E/1KG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS1241E/1KG4 meets industry standards.
7.What is the process for return or replacement of ADS1241E/1KG4?
All ADS1241E/1KG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1241E/1KG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS1241E/1KG4 part is unused and in its original packaging.
Return procedure for ADS1241E/1KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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