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Texas Instruments ADS1261BIRHBT
- Part No.:
- ADS1261BIRHBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS1261BIRHBT.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
ADS1261BIRHBT from Texas Instruments is a precision 24-bit delta-sigma analog-to-digital converter with integrated programmable gain amplifier (PGA), 10-channel analog input multiplexer, 2.5-V internal reference (4 ppm/°C drift), CRC data verification, and four GPIOs. It supports ±7 mV to ±5 V input range, 2.5 SPS to 40 kSPS data rates, and simultaneous 50/60-Hz rejection-designed for high-accuracy weigh scales and RTD-based temperature measurement systems.
For engineers reviewing the ADS1261BIRHBT datasheet, ADS1261BIRHBT pinout, ADS1261BIRHBT application, or ADS1261BIRHBT equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support tailored for industrial sensor interface design.
Technical Context
The ADS1261BIRHBT implements a chopper-stabilized delta-sigma modulator with digital filtering supporting single-cycle settling and line-frequency rejection. Its PGA offers gains from 1 to 128 with 1 GΩ input impedance, minimizing sensor loading error in bridge and RTD applications.
It integrates dual excitation current sources (50–3000 µA), burn-out detection, AC excitation outputs for bridge sensors, signal/reference monitors, and an internal temperature sensor-all synchronized under a unified clock domain with configurable START/DRDY control and SPI-compatible serial interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity for precision closed-loop control and calibration-critical instrumentation. |
| Data Rate | 2.5 SPS to 40 kSPS-enables flexible trade-off between noise performance (30 nVRMS at 20 SPS) and throughput in dynamic sensing. |
| Input Range | ±7 mV to ±5 V differential-supports direct connection to low-level strain gauges and high-level industrial transducers without external signal conditioning. |
| Reference Drift | 4 ppm/°C max (ADS1261B grade)-ensures stable full-scale accuracy across –40°C to +125°C ambient, critical for unattended field deployments. |
| INL Error | ±3 ppmFSR (gain = 32–128)-maintains sub-ppm linearity over full scale, enabling <1 LSB error in 24-bit systems with minimal calibration. |
| PGA Input Impedance | 1 GΩ-reduces loading-induced offset shift on high-impedance sensors like thermistors and piezoresistive elements. |
| CRC Protection | CRC-8-ATM (X⁸+X²+X¹+1)-detects bit errors in serial data transfers, preventing corrupted conversion results in noisy industrial environments. |
Pinout & Package
ADS1261BIRHBT is housed in a 5-mm × 5-mm, 32-pin VQFN package (RHB) with exposed thermal pad soldered to AVSS for thermal management and mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN9 | Analog input/output | 10 configurable single-ended or 5 differential inputs; multiplexed with IDAC1/IDAC2, REFN/REFP, GPIO, and ACX outputs per channel. |
| CAPP/CAPN | PGA output | Differential outputs for external capacitor feedback (4.7 nF C0G); sets antialias filter cutoff at 60 kHz and stabilizes PGA loop. |
| REFOUT | Reference output | 2.5-V buffered reference output; requires 10-µF bypass to AVSS for low-noise operation and PSRR optimization. |
| DOUT/DRDY | Dual-function digital I/O | Serial data output during read cycles; active-low data-ready flag when conversion completes-reduces pin count and simplifies timing. |
| GPIO0–GPIO3 | General-purpose I/O | Four bidirectional pins (ADS1261 only); usable as digital inputs, outputs, or configured as AC excitation phase controls (ACX1/ACX2). |
| BYPASS | Subregulator bypass | Connects to internal analog LDO; 1-µF capacitor to DGND ensures clean local supply for sensitive analog circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50/60-Hz rejection | Eliminates need for external notch filters or software post-processing in AC-line-noise-prone environments like factory floors. |
| Integrated excitation current sources | Eight programmable settings (50–3000 µA) with 0.7% accuracy enable direct RTD biasing and 4-wire resistance measurement without external DACs. |
| AC excitation for bridge sensors | Two-phase ACX outputs reduce thermal EMF drift in Wheatstone bridges-critical for microvolt-level strain measurements over temperature. |
| Signal and reference monitoring | Real-time fault detection on AINx, REFP/N, and REFOUT voltages prevents erroneous conversions due to open-circuit sensors or reference failure. |
| Internal temperature sensor | Calibrated 420 µV/°C output referenced to AVSS enables on-chip cold-junction compensation for thermocouples without external ICs. |
Applications
| PLC Analog Input Modules | Weigh Scales & Strain-Gauge Digitizers |
|---|---|
|
Use Scenario: High-density modular I/O cards acquiring 16–32 channels of process sensor data in industrial automation cabinets. IC Role / Device Role / Timing Role: Primary ADC with integrated PGA, reference, and CRC-handles isolated voltage/current inputs while rejecting 50/60-Hz noise from adjacent motor drives. Use Value: Reduces BOM count by eliminating external references, op-amps, and digital error-checking logic-cutting board area by >30% versus discrete solutions. |
Use Scenario: Platform-scale electronics measuring load cell outputs in commercial kitchen or warehouse weighing systems. IC Role / Device Role / Timing Role: Precision front-end digitizer with 30 nVRMS noise floor and 1 GΩ PGA input-preserves microvolt-level bridge signals amid vibration and thermal gradients. Use Value: Enables 1:1,000,000 resolution (20-bit ENOB) without auto-zero or chopper calibration-meeting OIML R76 Class III requirements out-of-box. |
| Temperature & Pressure Measurement | Lab Instrumentation |
|
Use Scenario: Portable handheld meters measuring RTD (Pt100/Pt1000) and thermocouple outputs in HVAC commissioning and calibration labs. IC Role / Device Role / Timing Role: Sensor interface with integrated 2.5-V reference, IDACs, and AC excitation-supports 2-/3-/4-wire RTD configurations and cold-junction compensation via internal temp sensor. Use Value: Single-chip solution eliminates external current sources, reference buffers, and thermistor networks-reducing calibration complexity and long-term drift uncertainty. |
Use Scenario: Benchtop multimeters and data loggers requiring traceable accuracy, low drift, and multi-sensor support (voltage, current, resistance, temperature). IC Role / Device Role / Timing Role: High-stability ADC core with 0.5 ppm/°C gain drift and 1 nV/°C offset drift-serves as primary digitizer in metrology-grade instruments with <1 ppm total error budget. Use Value: Delivers 24-bit effective resolution at 20 SPS with guaranteed linearity-enabling NIST-traceable calibration without periodic re-zeroing or gain adjustment. |
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 |
|---|---|---|---|
| ADS1260BIRHBT | 5-channel variant (vs. 10-channel); no GPIOs or AC excitation; same 24-bit core, PGA, and reference specs. | Suitable for cost-sensitive 4–5 sensor systems where bridge AC drive or digital I/O is unnecessary. | Select when channel count and feature set can be reduced-offers identical noise, drift, and accuracy at lower unit cost and smaller firmware footprint. |
| AD7177-2BRUZ | 24-bit, 10-channel, 10 kSPS sigma-delta ADC; no integrated PGA, IDACs, or AC excitation; external reference required. | Used in high-speed lab equipment where external signal conditioning is already present and flexibility in reference selection is prioritized. | Choose when system already includes precision external amplifiers and references-AD7177-2 provides higher throughput but demands more external components. |
Compared with ADS1261BIRHBT, ADS1260BIRHBT reduces channel count and removes GPIO/ACX features while retaining identical metrological performance; AD7177-2BRUZ trades integrated analog front-end capability for higher speed and external reference flexibility-making it less suitable for sensor-ready designs.
Availability
ADS1261BIRHBT is available at Aetrix Electronics and suitable for PLC analog input modules, weigh scales and strain-gauge digitizers, temperature and pressure measurement systems requiring stable component supply, long-term calibration integrity, and industrial temperature range operation.
Supply support for ADS1261BIRHBT 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 ADS126x product line was designed specifically for high-accuracy sensor measurement in harsh environments-integrating PGA, reference, diagnostics, and excitation into a single chip to simplify industrial and test equipment design.
FAQ
What is the maximum differential input voltage supported by ADS1261BIRHBT at gain = 128?
The ADS1261BIRHBT supports a maximum differential input voltage of ±(AVDD – AVSS – 0.6 V) / Gain when VREF ≥ AVDD – AVSS – 0.6 V. At gain = 128 and AVDD = 5 V, AVSS = 0 V, this yields ±38.3 mV. Exceeding this risks clipping or nonlinearity-designers must ensure sensor output stays within this bound or reduce gain accordingly. The ADS1261BIRHBT's wide ±7 mV to ±5 V range applies only at lower gains.
Does ADS1261BIRHBT require an external crystal or oscillator?
No, ADS1261BIRHBT includes a fully integrated, factory-trimmed internal oscillator operating at 7.3728 MHz (typical), supporting all data rates from 2.5 SPS to 40 kSPS. An external clock may be applied via CLKIN only if higher frequency stability or synchronization with system clocks is needed-otherwise, the internal oscillator eliminates BOM cost and layout complexity. The ADS1261BIRHBT's internal oscillator has ±0.5% accuracy over temperature.
How does the CRC function work in ADS1261BIRHBT?
The ADS1261BIRHBT implements CRC-8-ATM (polynomial X⁸+X²+X¹+1) on all serial read transactions, appending an 8-bit checksum to conversion data. When enabled, the host controller verifies this CRC before accepting data-detecting bit errors caused by EMI, ground bounce, or marginal signal integrity. This feature is configurable per register and operates transparently without CPU overhead. The ADS1261BIRHBT's CRC ensures data reliability in electrically noisy industrial settings.
Can ADS1261BIRHBT measure 4-wire RTDs without external components?
Yes, ADS1261BIRHBT supports full 4-wire RTD measurement using its two integrated excitation current sources (IDAC1/IDAC2), 10 analog inputs (including dedicated REFP0/REFN0 on AIN0/AIN1), and internal reference. By routing IDAC1 through RTD and IDAC2 through lead resistance, and measuring voltage across REFP/N, the ADS1261BIRHBT cancels lead wire resistance automatically-no external op-amps, resistors, or switches required. This capability is built into the ADS1261BIRHBT's hardware architecture.
What is the purpose of the BYPASS pin on ADS1261BIRHBT?
The BYPASS pin on ADS1261BIRHBT connects to an internal analog subregulator that powers sensitive analog circuitry including the PGA and modulator. A 1-µF ceramic capacitor must be placed between BYPASS and DGND to stabilize this local supply and suppress switching noise from the digital domain. Omitting this capacitor degrades PSRR and increases noise-especially at higher data rates. The ADS1261BIRHBT's BYPASS pin is mandatory for achieving specified 30 nVRMS noise performance.
ADS1261BIRHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 40k
- Number of Inputs:
- 10
- 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, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1261BIRHBT FAQ
1.How can I place an order for ADS1261BIRHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1261BIRHBT 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 ADS1261BIRHBT reliable?
The price and inventory of ADS1261BIRHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1261BIRHBT is usually 5 days.
3.What payment methods are accepted for ADS1261BIRHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1261BIRHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1261BIRHBT?
ADS1261BIRHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1261BIRHBT 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 ADS1261BIRHBT?
For technical support, including ADS1261BIRHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1261BIRHBT requirements.
6.How does Aetrix verify that ADS1261BIRHBT is sourced from the original manufacturer or authorized distributors?
All ADS1261BIRHBT 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 ADS1261BIRHBT meets industry standards.
7.What is the process for return or replacement of ADS1261BIRHBT?
All ADS1261BIRHBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS1261BIRHBT, 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 ADS1261BIRHBT part is unused and in its original packaging.
Return procedure for ADS1261BIRHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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