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Texas Instruments ADS1281IPWR
- Part No.:
- ADS1281IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1281IPWR.pdf
- Description:
- IC ADC 31BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,611
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Product details
Overview
ADS1281IPWR from Texas Instruments is an ultra-high-precision 32-bit delta-sigma ADC with fourth-order modulator, 130dB SNR at 250SPS, ±0.6ppm INL, and programmable sinc+FIR+IIR digital filter - designed for seismic monitoring and energy exploration instrumentation requiring sub-microvolt resolution and stable dc accuracy.
For engineers reviewing the ADS1281IPWR datasheet, ADS1281IPWR pinout, ADS1281IPWR application, or ADS1281IPWR equivalent, this page delivers verified technical context, TSSOP-24 pin mapping, real-world use cases in geophysical sensing, and two validated alternative ADCs with documented functional trade-offs.
Technical Context
The ADS1281IPWR integrates a fourth-order, inherently stable ΔΣ modulator with pipelined 2+2 architecture, operating at fMOD = fCLK/4 (up to 1.024MHz), delivering differential input sampling with over-range detection via MFLAG output. Its modulator supports direct bit-stream access (MCLK/M0/M1) when bypassing the on-chip filter.
The digital filter chain comprises a variable-decimation fifth-order sinc stage (decimate-by-8 to 128), followed by a fixed-decimate-by-32 FIR low-pass with selectable linear or minimum-phase response, then an adjustable first-order IIR high-pass filter (0.1–10Hz corner). Output data rates range from 250SPS to 4kSPS in FIR mode, or up to 128kSPS in sinc-only mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 31-bit no-missing-codes output with 32-bit word option - enables full utilization of inherent 130dB dynamic range without truncation loss. |
| SNR | 130dB at 250SPS (typ) - corresponds to ~1.1μVRMS noise floor with ±2.5V reference, critical for weak seismic signal capture. |
| INL | ±0.6ppm (max) - ensures <±1 LSB error across full scale at 32-bit resolution, eliminating calibration dependency for precision dc measurements. |
| Data Rate | 250–4000SPS (FIR mode); 8k–128kSPS (sinc mode) - allows trade-off between noise floor and temporal resolution in field-deployed sensors. |
| Power | 12mW operating (AVDD/AVSS = ±2.5V, DVDD = 3.3V) - enables battery-powered geophone arrays with thermal stability over –40°C to +85°C. |
| Reference Input | VREFP–VREFN = 0.5–5V differential - supports flexible gain staging with external precision references or internal LDO-derived rails. |
| Modulator Over-Range | Detection latency <1/fMOD cycle; flag asserts within 12 modulator clocks - enables real-time saturation monitoring without post-processing delay. |
Pinout & Package
TSSOP-24 package (7.8mm × 4.4mm, 0.65mm pitch), thermally enhanced with three DGND pins (6, 12, 23) and dedicated analog/digital ground separation for >120dB PSRR/CMRR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN (13, 14) | Differential analog input | Accepts ±2.5V bipolar or +5V unipolar input; 55kΩ input impedance enables direct connection to geophone transducers. |
| VREFP / VREFN (18, 17) | Differential reference input | Defines full-scale range (±VREF/2); supports external precision references or internal AVDD/AVSS rails. |
| AVDD / AVSS (15, 16) | Analog supply rails | Support ±2.5V or +5V operation; independent from digital supply to isolate noise-sensitive modulator core. |
| DVDD (22) | Digital supply | 1.8V–3.3V tolerant - enables interface with low-voltage FPGAs or microcontrollers without level-shifting. |
| MOD/DIN (5) | Mode control input | High = modulator bit-stream output (bypasses digital filter); low = filtered data output - enables dual-mode system architecture. |
| HPF/SYNC (10) | Multi-function digital input | In filter mode: enables/disables IIR high-pass; in modulator mode: synchronizes conversion start across multiple devices. |
| MFLAG (11) | Over-range flag output | Asserts high within 12 modulator clocks upon input exceeding ±100% FS - provides deterministic fault signaling for real-time diagnostics. |
| BYPAS (24) | Digital core bypass | Requires 0.1μF capacitor to DGND - stabilizes internal LDO powering digital logic, critical for jitter-free SCLK timing. |
Key Features
| Feature | Design Value |
|---|---|
| Inherently stable 4th-order ΔΣ modulator | Eliminates need for external anti-aliasing filters and guarantees monotonic recovery from overdrive without self-resetting artifacts. |
| Programmable FIR phase response | Selectable linear or minimum-phase FIR reduces group delay variation across channels - essential for coherent multi-sensor array timing alignment. |
| On-chip calibration engine | Corrects offset and gain errors to ≤1μV and ≤0.0002% respectively - enables single-point calibration in field-deployed equipment. |
| Synchronized multi-device operation | SYNC input aligns modulator and filter reset across multiple ADS1281IPWR units - ensures phase-coherent sampling in distributed seismic arrays. |
| Flexible power management | PWDN pin reduces current to 10mW; STANDBY command retains register state - supports duty-cycled acquisition in remote sensor nodes. |
Applications
| Seismic Data Acquisition | Energy Exploration Logging |
|---|---|
Use Scenario: High-density geophone arrays deployed in boreholes or surface grids measure microseismic events with sub-Hz bandwidth. IC Role / Device Role / Timing Role: Primary ADC capturing differential voltage from moving-coil geophones; provides synchronized 250SPS samples with 130dB SNR. Use Value: Enables detection of 10nV-level signals buried in thermal noise - directly improves signal-to-noise ratio for subsurface imaging resolution. |
Use Scenario: Downhole wireline logging tools acquire resistivity, gamma-ray, and acoustic data during oil/gas well drilling operations. IC Role / Device Role / Timing Role: Precision front-end ADC digitizing sensor outputs under extreme temperature gradients (–40°C to +125°C). Use Value: ±0.6ppm INL and 0.4ppm/°C gain drift ensure measurement repeatability across thermal cycles - reduces need for recalibration during extended runs. |
| High-Accuracy Instrumentation | Low-Frequency Spectral Analysis |
Use Scenario: Laboratory-grade vibration analyzers and metrology systems require traceable dc accuracy and ultra-low distortion. IC Role / Device Role / Timing Role: Reference-grade ADC in calibrated test equipment; uses internal calibration registers to maintain NIST-traceable linearity. Use Value: –122dB THD and 123dB SFDR eliminate harmonic contamination - preserves spectral purity for ISO 5347-compliant vibration calibration. |
Use Scenario: Structural health monitoring systems analyze building resonance modes below 10Hz using long-duration time-series capture. IC Role / Device Role / Timing Role: Low-drift ADC feeding FFT processors; leverages programmable IIR HPF (0.1Hz corner) to remove thermal drift artifacts. Use Value: Adjustable high-pass filter eliminates baseline wander without phase distortion - maintains integrity of sub-1Hz modal frequency estimation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS127L01IPBS | 24-bit, 512kSPS max, lower SNR (111dB), no modulator bit-stream output | Better suited for wideband vibration analysis; lacks seismic-grade dc stability and over-range flag speed | Choose when higher sample rate outweighs need for 32-bit resolution and real-time saturation detection |
| AD7768-1ACPZ | 24-bit, 256kSPS, 112dB SNR, integrated buffer, SPI-only interface | Optimized for compact PCB layout with on-chip buffers; no TSSOP-24 pinout or analog supply flexibility (AVSS required) | Prefer for space-constrained industrial DAQ where ±2.5V analog supplies are impractical |
Compared with ADS1281IPWR, ADS127L01IPBS trades 19dB SNR and missing modulator output for 200× higher data rate, while AD7768-1ACPZ sacrifices dc accuracy and supply flexibility for integration density - neither matches ADS1281IPWR's combination of 130dB SNR, ±0.6ppm INL, and deterministic over-range detection in TSSOP-24.
Availability
ADS1281IPWR is available at Aetrix Electronics and suitable for seismic monitoring systems, downhole energy exploration tools, and high-accuracy instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ADS1281IPWR 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 conversion and industrial signal chain solutions.
The ADS1281IPWR belongs to TI's high-end delta-sigma ADC product line, engineered specifically for geophysical sensing and energy exploration applications demanding uncompromised dc accuracy, ultra-low noise, and robust operation in harsh environments.
FAQ
What is the maximum achievable SNR of the ADS1281IPWR and at what data rate?
The ADS1281IPWR achieves 130dB SNR at 250SPS in FIR filter mode with 2.5V reference, corresponding to ~1.1μVRMS noise floor. This is measured with shorted inputs and represents the device's fundamental noise limit under optimal conditions. At 500SPS, SNR drops to 127dB, confirming the inverse relationship between bandwidth and dynamic range. The ADS1281IPWR datasheet specifies these values across temperature and supply variations, ensuring consistent performance in field-deployed seismic sensors.
Does the ADS1281IPWR support true bipolar input operation, and what supply configuration enables it?
Yes, the ADS1281IPWR supports true bipolar input operation using AVDD = +2.5V and AVSS = –2.5V, establishing a ±2.5V analog supply rail that enables differential input range of ±VREF/2 with ground-referenced signals. This configuration is explicitly validated in the datasheet's electrical characteristics table and typical performance curves. The ADS1281IPWR also supports unipolar +5V operation (AVDD = +5V, AVSS = 0V) with input offset - both modes are fully specified from –40°C to +85°C.
How does the modulator over-range detection (MFLAG) function, and what is its response latency?
The ADS1281IPWR's MFLAG pin asserts high within 12 modulator clock cycles (fMOD = fCLK/4) when the differential input exceeds ±100% of full-scale, with ±2.5% threshold tolerance. This hardware-level detection operates independently of the digital filter path and provides deterministic timing - critical for real-time fault handling in seismic arrays. The MFLAG signal remains asserted until input returns within range, enabling immediate system-level intervention without software polling overhead.
Can the ADS1281IPWR operate with different digital and analog supply voltages, and what are the valid ranges?
Yes, the ADS1281IPWR supports independent supply domains: AVDD/AVSS from –2.6V to +5.25V (enabling ±2.5V or +5V analog rails), and DVDD from 1.65V to 3.6V (compatible with 1.8V or 3.3V digital logic). This separation is mandatory for achieving >120dB PSRR - the datasheet confirms 85–95dB AVDD/AVSS rejection and 85–105dB DVDD rejection at 60Hz. The ADS1281IPWR's internal LDO derives digital core voltage from DVDD, making it immune to analog supply ripple.
What is the purpose of the PINMODE pin, and how does it affect device configuration?
The PINMODE pin (pin 21) selects between Pin Mode (PINMODE = 1) and Register Mode (PINMODE = 0). In Pin Mode, all functions are controlled by hardwired pin states (e.g., MOD/DIN, HPF/SYNC), eliminating firmware dependencies - ideal for simple, deterministic systems. In Register Mode, configuration is performed via SPI writes to internal registers, enabling dynamic reconfiguration. The ADS1281IPWR's terminal functions table explicitly defines pin behavior for both modes, and mixing modes is prohibited per datasheet guidance.
ADS1281IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 31
- Sampling Rate (Per Second):
- 4k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1281IPWR FAQ
1.How can I place an order for ADS1281IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1281IPWR 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 ADS1281IPWR reliable?
The price and inventory of ADS1281IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1281IPWR is usually 5 days.
3.What payment methods are accepted for ADS1281IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1281IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1281IPWR?
ADS1281IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1281IPWR 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 ADS1281IPWR?
For technical support, including ADS1281IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1281IPWR requirements.
6.How does Aetrix verify that ADS1281IPWR is sourced from the original manufacturer or authorized distributors?
All ADS1281IPWR 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 ADS1281IPWR meets industry standards.
7.What is the process for return or replacement of ADS1281IPWR?
All ADS1281IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1281IPWR, 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 ADS1281IPWR part is unused and in its original packaging.
Return procedure for ADS1281IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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