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Texas Instruments ADS1240E/1K
- Part No.:
- ADS1240E/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS1240E/1K.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
ADS1240E/1K 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 supply. It is used in high-precision weigh scales and industrial process control systems requiring stable ratiometric measurement.
For engineers reviewing the ADS1240E/1K datasheet, ADS1240E/1K pinout, ADS1240E/1K application, or ADS1240E/1K equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready availability details - all grounded in TI's SBAS173F production data sheet.
Technical Context
The ADS1240E/1K 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 selectable output data rates (3.75Hz/7.5Hz/15Hz). Its multiplexed 8-channel input supports differential or single-ended configurations, with chopper-stabilized buffer enabling 5GΩ input impedance when enabled.
It integrates burnout current sources (2µA per input), an 8-bit offset DAC (±VREF/(2•PGA) range), and dual power domains (AVDD/DVDD). Calibration commands (SELFCAL, SYSOCAL, SYSGCAL) correct internal and system-level offset/gain errors, with mandatory PGA=1 for gain self-calibration and RANGE=0 during calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes - guarantees monotonicity and full code coverage across full dynamic range. |
| INL | ±0.0015% FS - limits absolute linearity error to ±1 LSB at 24-bit scale for precision sensor digitization. |
| Effective Resolution | 21 bits at PGA=1, 19 bits at PGA=128 - defines usable noise-free bits under specified gain and data rate. |
| Power Consumption | 600 µW typical at DVDD=5V, PGA=1, buffer OFF - enables low-power portable instrumentation designs. |
| Input Channels | Up to 4 differential or 8 single-ended inputs - supports multi-sensor monitoring without external MUX. |
| Reference Input | Differential, 0.1V–5V range - allows flexible ratiometric sensing with external precision references. |
| Common-Mode Rejection | 130 dB at 60Hz (fDATA=15Hz) - suppresses mains-coupled interference in industrial environments. |
Pinout & Package
ADS1240E/1K is housed in a 24-pin SSOP package (7.5 mm × 5.7 mm, 0.635 mm pitch) with exposed thermal pad (not electrically connected). Pin functions are defined per TI SBAS173F Rev F, with dual-role AINx/Dx pins configurable via IOCON register.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DVDD, AVDD | Digital and analog power supplies | Separate 2.7–5.25V domains minimize digital noise coupling into analog path; DGND/AGND isolation required. |
| AIN0/D0 – AIN3/D3 | Configurable analog input / data I/O | Four bidirectional pins usable as analog inputs or GPIO; direction controlled by IOCON/DIR registers. |
| VREF+, VREF– | Differential reference voltage inputs | Accepts 0.1–5V differential reference; enables ratiometric accuracy tied to sensor excitation or reference stability. |
| SCLK, DIN, DOUT, CS, POL | SPI-compatible serial interface | Full-duplex, Schmitt-triggered signals support noise-immune communication up to 5 MHz clock rate. |
| BUFEN | Buffer enable control | Active-high signal enabling chopper-stabilized FET input buffer - raises input impedance to 5 GΩ. |
| DRDY | Data ready indicator | Active-low open-drain output signals valid conversion completion; synchronizes MUX changes to avoid settling error. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50Hz/60Hz rejection | ≥–90dB notch depth at both frequencies - eliminates AC line interference without external filtering or software post-processing. |
| Single-cycle settling digital filter | Valid data on first conversion after channel change - enables rapid scanning of multiple sensors without dead time. |
| Burnout current sources | 2µA per input - detects open-circuit (full-scale output) or short-circuit (near-zero output) sensor faults autonomously. |
| On-chip offset DAC | 8-bit signed output, ±VREF/(2•PGA) range - digitally trims sensor offset without external components or calibration hardware. |
| Programmable data output rates | 3.75Hz / 7.5Hz / 15Hz with fixed FIR coefficients - balances resolution, noise, and update rate for specific application SNR needs. |
Applications
| Industrial Process Control | Weigh Scales |
|---|---|
|
Use Scenario: Monitoring pressure, temperature, and flow transducers in PLC-based control loops with 50/60Hz EMI. IC Role / Device Role / Timing Role: Primary ADC digitizing low-level mV outputs from strain gauges and RTDs with integrated PGA and reference buffering. Use Value: Simultaneous 50Hz/60Hz rejection ensures stable readings in factory-floor environments without additional notch filters. |
Use Scenario: High-resolution weight measurement in platform scales and benchtop analyzers using load cell bridges. IC Role / Device Role / Timing Role: Delta-sigma ADC with 24-bit no-missing-codes resolution and on-chip offset DAC for zero-point calibration. Use Value: 21-bit effective resolution at PGA=1 enables <1µV sensitivity on 5V full-scale, supporting sub-gram accuracy. |
| Liquid/Gas Chromatography | Blood Analysis Instruments |
|
Use Scenario: Digitizing detector output signals (e.g., thermal conductivity, FID) requiring low drift and high linearity over temperature. IC Role / Device Role / Timing Role: Precision ADC with self- and system-calibration support for maintaining accuracy across ambient shifts. Use Value: Offset drift of 0.02 ppm/°C and gain drift of 0.5 ppm/°C minimize recalibration frequency in lab equipment. |
Use Scenario: Measuring electrochemical sensor outputs in point-of-care blood glucose or electrolyte analyzers. IC Role / Device Role / Timing Role: Low-power, rail-to-rail capable ADC with burnout detection to validate sensor integrity before each reading. Use Value: 600 µW power consumption extends battery life in handheld diagnostics while maintaining 24-bit fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1241IPW | 24-pin SSOP like ADS1240E/1K but supports 8 analog inputs (AIN0–AIN7); ADS1240E/1K supports only AIN0–AIN3. | ADS1241IPW enables full 8-channel differential acquisition; ADS1240E/1K suits 4-channel or mixed analog/GPIO systems. | Select ADS1241IPW when needing >4 analog channels; ADS1240E/1K is optimal where GPIO reuse or cost reduction is prioritized. |
| ADS1256IPW | 24-bit, 30kSPS max, 5V supply only, no burnout sources, no offset DAC, SPI-only interface (no DIO pins). | ADS1256IPW targets higher-speed applications (>15Hz) without sensor fault detection or digital I/O flexibility. | Choose ADS1256IPW for throughput >15Hz; ADS1240E/1K remains preferred for low-noise, fault-aware, multi-function I/O designs. |
Compared with ADS1241IPW and ADS1256IPW, ADS1240E/1K uniquely combines 4-channel analog input + 4 configurable data I/O pins, integrated burnout detection, and on-chip offset DAC - making it ideal for compact, self-diagnosing sensor nodes where board space and BOM count are constrained.
Availability
ADS1240E/1K is available at Aetrix Electronics and suitable for industrial process control, weigh scales, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS1240E/1K 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 ADS1240E/1K belongs to TI's precision delta-sigma ADC product line, designed specifically for high-resolution, low-drift measurement in smart transmitters, chromatography systems, and portable medical instruments.
FAQ
What is the maximum effective resolution of the ADS1240E/1K at PGA = 1?
The ADS1240E/1K achieves 21 bits of effective resolution at PGA = 1, as confirmed in TI's SBAS173F datasheet under "EFFECTIVE NUMBER OF BITS vs PGA SETTING" plots. This value reflects RMS noise-limited performance at 15Hz output data rate with buffer enabled and VREF = 2.5V. The ADS1240E/1K maintains 24-bit no-missing-codes architecture regardless of PGA setting.
Does the ADS1240E/1K support simultaneous 50Hz and 60Hz line-frequency rejection?
Yes, the ADS1240E/1K provides simultaneous 50Hz and 60Hz rejection of ≥–90dB minimum, achieved through its fixed-coefficient 1279-tap FIR digital filter operating at 15Hz/7.5Hz/3.75Hz data rates. This capability is explicitly guaranteed in the FEATURES section of SBAS173F and verified in Figure 6's frequency response plots. The ADS1240E/1K requires no external components or firmware tuning to deliver this rejection.
How many analog input channels does the ADS1240E/1K support?
The ADS1240E/1K supports up to four analog input channels (AIN0–AIN3), configurable as either single-ended or differential pairs. Unlike the ADS1241 variant, it does not include AIN4–AIN7. These pins also serve as data I/O (D0–D3) when configured via the IOCON register - a feature confirmed in the PIN DESCRIPTIONS and DATA I/O INTERFACE sections of SBAS173F.
What is the role of the BUFEN pin on the ADS1240E/1K?
The BUFEN pin on the ADS1240E/1K enables the chopper-stabilized differential FET-input voltage buffer. When asserted high (and BUFEN bit set in ACR register), it raises input impedance from 5MΩ/PGA to 5GΩ and extends common-mode input range to AGND+0.05V to AVDD–1.5V. Buffer activation increases analog supply current - e.g., ~50µA at PGA=1, ~500µA at PGA=128 - as documented in SBAS173F Electrical Characteristics tables.
Can the ADS1240E/1K perform self-calibration while operating at PGA = 128?
No - self-calibration commands SELFCAL and SELFGCAL require PGA = 1 prior to execution, as stated in the CALIBRATION section of SBAS173F. However, SELFOCAL (offset-only self-cal) permits any PGA setting. For full calibration at high gain, users must first set PGA = 1, run SELFGCAL, then reconfigure PGA = 128 and run SELFOCAL. The ADS1240E/1K enforces this sequence to prevent buffer input range violations and ensure calibration validity.
ADS1240E/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 4
- 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:
- 24-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1240E/1K FAQ
1.How can I place an order for ADS1240E/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1240E/1K 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 ADS1240E/1K reliable?
The price and inventory of ADS1240E/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1240E/1K is usually 5 days.
3.What payment methods are accepted for ADS1240E/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1240E/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1240E/1K?
ADS1240E/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1240E/1K 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 ADS1240E/1K?
For technical support, including ADS1240E/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1240E/1K requirements.
6.How does Aetrix verify that ADS1240E/1K is sourced from the original manufacturer or authorized distributors?
All ADS1240E/1K 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 ADS1240E/1K meets industry standards.
7.What is the process for return or replacement of ADS1240E/1K?
All ADS1240E/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS1240E/1K, 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 ADS1240E/1K part is unused and in its original packaging.
Return procedure for ADS1240E/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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