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Texas Instruments ADS1282IPW
- Part No.:
- ADS1282IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1282IPW.pdf
- Description:
- IC ADC 31BIT SIGMA-DELTA 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
ADS1282IPW from Texas Instruments is an ultra-high-precision, 32-bit delta-sigma analog-to-digital converter with integrated 64× programmable gain amplifier (PGA), two-channel input multiplexer, and fourth-order modulator. It delivers 130-dB SNR at 250 SPS, ±0.5 ppm INL, and –122 dB THD - optimized for seismic monitoring and energy exploration instrumentation requiring sub-microvolt resolution and exceptional linearity.
For engineers reviewing the ADS1282IPW datasheet, ADS1282IPW pinout, ADS1282IPW application, or ADS1282IPW equivalent, key selection considerations include its 250–4000 SPS programmable data rate, flexible sinc+FIR+IIR digital filter, on-chip offset/gain calibration engine, and TSSOP-28 package with dedicated modulator over-range flag (MFLAG) and SYNC input for multi-device synchronization.
Technical Context
The ADS1282IPW implements a fourth-order, inherently stable, 2+2 pipelined delta-sigma modulator architecture that shifts quantization noise beyond the passband for high-fidelity signal reconstruction. Its continuous-time PGA features 5 nV/√Hz input-referred noise and supports gains of 1 to 64 via register-controlled PGA[2:0] bits.
Digital filtering includes selectable linear or minimum-phase FIR response, programmable high-pass corner (0.1–10 Hz), and filter bypass mode for external post-processing. The device supports both unipolar (+5 V AVDD/AVSS) and bipolar (±2.5 V) analog supplies, with DVDD operating from 1.8 V to 3.3 V and internal LDO regulation via BYPAS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 32-bit output word with no missing codes; enables sub-ppm system-level accuracy in geophysical sensor interfaces. |
| SNR | 130 dB at 250 SPS (PGA = 1); provides >100 dB effective number of bits (ENOB) for low-frequency seismic waveform capture. |
| INL | ±0.5 ppm (0.00005% FSR); ensures traceable linearity across full-scale range without external trimming. |
| THD | –122 dB at 31.25 Hz (PGA = 1); minimizes harmonic distortion in high-fidelity instrumentation signal chains. |
| Data Rate | 250–4000 SPS (FIR mode); configurable for trade-off between noise floor and temporal resolution in slow-varying geophone signals. |
| PGA Noise | 5 nV/√Hz (chop off); maintains ultra-low noise floor when interfacing directly to high-impedance hydrophones or geophones. |
| Power Dissipation | 25 mW normal operation; enables dense channel count in portable seismic acquisition systems with thermal constraints. |
Pinout & Package
TSSOP-28 package with 0.65 mm pitch, 9.7 mm × 4.4 mm footprint, and exposed thermal pad (not electrically connected). Designed for industrial temperature range (–40°C to +85°C) with extended operation to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK | Master clock input | Accepts 1–4.096 MHz crystal or CMOS clock; drives internal modulator and digital logic timing. |
| SCLK | Serial interface clock | SPI-compatible clock input; controls data transfer timing for register reads/writes and DOUT sampling. |
| DRDY | Data ready indicator | Active-low pulse signals valid conversion result available on DOUT; used for interrupt-driven readout. |
| DOUT / DIN | Serial data I/O | Full-duplex SPI interface: DOUT outputs conversion data or status; DIN accepts configuration commands. |
| MFLAG | Modulator over-range flag | Real-time diagnostic output indicating modulator saturation; enables immediate gain adjustment or fault logging. |
| SYNC | Multi-device synchronization | Resets modulator and digital filter simultaneously; allows precise time alignment across multiple ADS1282IPW channels. |
| AINP1/AINN1, AINP2/AINN2 | Differential analog inputs | Two independent 2-channel differential input pairs support dual-sensor acquisition or self-test configurations. |
| VREFP/VREFN | Reference voltage inputs | Accept 0.5–5 V differential reference; sets full-scale range and directly impacts absolute measurement accuracy. |
| BYPAS | LDO sub-regulator output | Internal 1.8 V supply for digital core; requires 1 μF capacitor to DGND for noise suppression and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PGA with 1–64 gain | Eliminates external amplification stages; reduces board area and noise contribution while maintaining 5 nV/√Hz input noise. |
| Programmable digital filter | Configurable sinc + FIR + IIR chain enables optimized anti-aliasing, dc removal, and group delay control per application requirement. |
| On-chip offset/gain calibration | Reduces system-level calibration effort; achieves <1 μV offset error and <0.0002% gain error after calibration. |
| Two-channel input MUX | Supports five configurations including dual-input acquisition, common-mode test, and 400 Ω shorted self-test - critical for field-deployable diagnostics. |
| Modulator over-range detection | MFLAG pin provides immediate hardware-level alert on input overload, enabling real-time gain scaling without software polling. |
Applications
| Seismic Data Acquisition | Energy Exploration Logging |
|---|---|
Use Scenario: High-density geophone arrays deployed in land or marine surveys capturing microseismic events and reflection waveforms. IC Role / Device Role / Timing Role: Primary ADC front-end digitizing low-amplitude, sub-100 Hz signals from geophone sensors with ultra-low noise and drift. Use Value: 130 dB SNR and ±0.5 ppm INL enable detection of weak subsurface reflections buried in thermal and environmental noise. | Use Scenario: Downhole wireline logging tools measuring resistivity, gamma ray, and acoustic impedance in oil/gas wellbores. IC Role / Device Role / Timing Role: Precision ADC for analog sensor conditioning in high-temperature, high-vibration environments with limited power budget. Use Value: 25 mW power dissipation and –40°C to +125°C operation allow integration into compact, thermally isolated probe housings. |
| High-Accuracy Instrumentation | Hydrophone Array Processing |
Use Scenario: Laboratory-grade metrology systems performing calibration of strain gauges, load cells, and precision voltage references. IC Role / Device Role / Timing Role: Reference-grade digitizer providing traceable measurements with calibrated offset/gain registers and stable reference input path. Use Value: On-chip calibration engine eliminates need for external trim pots or periodic recalibration, reducing maintenance overhead. | Use Scenario: Oceanographic observatories using distributed hydrophone arrays to monitor marine mammal vocalizations and underwater acoustics. IC Role / Device Role / Timing Role: Low-noise ADC interfacing directly to high-impedance piezoelectric hydrophones with minimal signal degradation. Use Value: 5 nV/√Hz PGA noise density and 100 GΩ input impedance (chop off) preserve signal integrity from weak, high-Z sources. |
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 |
|---|---|---|---|
| ADS1283IPW | Higher 132 dB SNR at 250 SPS; adds internal oscillator; same pinout and register map. | Preferred for new designs where oscillator integration simplifies BOM and layout; identical performance envelope otherwise. | Select ADS1283IPW if eliminating external clock source is prioritized; ADS1282IPW remains optimal when precise external clock control is required. |
| AD7768-1ACPZ | 8-channel, 24-bit, 128 kSPS max; lower SNR (112 dB); different SPI protocol and register structure. | Used in multi-sensor, higher-bandwidth systems where channel density outweighs ultimate resolution. | Choose AD7768-1ACPZ only when simultaneous multi-channel sampling is mandatory; not drop-in compatible due to pinout, timing, and firmware differences. |
Compared with ADS1283IPW and AD7768-1ACPZ, the ADS1282IPW uniquely balances single-channel ultra-high resolution (130 dB SNR), integrated PGA flexibility, and deterministic modulator over-range signaling - making it the preferred choice for mission-critical, low-channel-count geophysical sensing where measurement integrity is non-negotiable.
Availability
ADS1282IPW is available at Aetrix Electronics and suitable for seismic monitoring, energy exploration logging, and high-accuracy instrumentation requiring stable component supply and long-term industrial lifecycle support.
Supply support for ADS1282IPW 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 deep expertise in precision data conversion and industrial signal chain solutions.
The ADS1282IPW belongs to TI's high-resolution delta-sigma ADC product line, engineered specifically for geophysical sensing, seismic data acquisition, and other ultra-low-noise, low-bandwidth measurement applications demanding metrology-grade accuracy.
FAQ
What is the maximum achievable SNR of the ADS1282IPW and under what conditions?
The ADS1282IPW achieves up to 130 dB SNR at 250 SPS with PGA = 1, measured using a 20 mVDC input signal and typical conditions (AVDD = +2.5 V, AVSS = –2.5 V, fCLK = 4.096 MHz, VREF = 5 V). This value is confirmed in Table 1 of the SBAS418I datasheet and represents the highest verified SNR for the ADS1282IPW under standard test conditions.
Does the ADS1282IPW support true bipolar input operation?
Yes, the ADS1282IPW supports true bipolar input operation when configured with ±2.5 V analog supplies (AVDD = +2.5 V, AVSS = –2.5 V) and appropriate reference voltages (VREFP = +2.5 V, VREFN = –2.5 V). This enables ground-referenced differential input ranges such as ±2.5 V (PGA = 1) or ±0.039 V (PGA = 64), as specified in Table 3 of the ADS1282IPW datasheet.
How does the SYNC input function in multi-device synchronization with the ADS1282IPW?
The SYNC input on the ADS1282IPW resets both the modulator and digital filter simultaneously, ensuring deterministic phase alignment across multiple devices. When driven by a common clock edge, all ADS1282IPW units start conversion cycles in lockstep - essential for coherent beamforming in hydrophone arrays or synchronized seismic channel acquisition.
What is the purpose of the BYPAS pin on the ADS1282IPW and how must it be connected?
The BYPAS pin on the ADS1282IPW is the output of the internal LDO sub-regulator supplying the digital core. It must be decoupled to DGND with a 1 μF ceramic capacitor (X7R, 0805) placed as close as possible to the pin. This capacitor stabilizes the 1.8 V digital supply and suppresses switching noise; BYPAS must never drive external circuitry.
Can the ADS1282IPW operate without an external master clock?
No, the ADS1282IPW requires an external master clock applied to the CLK pin (1–4.096 MHz). Unlike the pin-compatible ADS1283IPW, it lacks an internal oscillator. Omitting the CLK signal prevents modulator operation and results in no valid conversion output - the device will remain in reset state regardless of SYNC or DRDY activity.
ADS1282IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 31
- Sampling Rate (Per Second):
- 4k
- Number of Inputs:
- 2
- Input Type:
- Differential
- 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:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1282IPW FAQ
1.How can I place an order for ADS1282IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1282IPW 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 ADS1282IPW reliable?
The price and inventory of ADS1282IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1282IPW is usually 5 days.
3.What payment methods are accepted for ADS1282IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1282IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1282IPW?
ADS1282IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1282IPW 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 ADS1282IPW?
For technical support, including ADS1282IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1282IPW requirements.
6.How does Aetrix verify that ADS1282IPW is sourced from the original manufacturer or authorized distributors?
All ADS1282IPW 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 ADS1282IPW meets industry standards.
7.What is the process for return or replacement of ADS1282IPW?
All ADS1282IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS1282IPW, 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 ADS1282IPW part is unused and in its original packaging.
Return procedure for ADS1282IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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