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Texas Instruments ADS7280IRSAR
- Part No.:
- ADS7280IRSAR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7280IRSAR.pdf
- Description:
- IC ADC 14BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
ADS7280IRSAR from Texas Instruments is a 14-bit, 1-MSPS dual-channel unipolar SAR analog-to-digital converter with integrated 2:1 MUX, programmable TAG bit output, and SPI/DSP-compatible serial interface. It operates from 2.7V to 5.5V analog supply, delivers ±0.4 LSB INL/DNL, and supports daisy-chain mode for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS7280IRSAR datasheet, ADS7280IRSAR pinout, ADS7280IRSAR application, or ADS7280IRSAR equivalent, key selection criteria include dual-channel auto/manual channel select, 105.3 dB SFDR at 10 kHz, built-in conversion clock (21–24.5 MHz), deep power-down mode (4 µA), and QFN-16 package compatibility with TSSOP-16 footprint.
Technical Context
The ADS7280IRSAR implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, supporting both manual (CONVST-triggered) and automatic (FS/CS-synchronized) conversion modes. Its dual-input MUX enables time-multiplexed sampling of +IN0 and +IN1 with COM as common inverting input.
It features a programmable EOC/INT/CDI pin with polarity control, configurable TAG bit output for channel identification in daisy-chain configurations, and supports SPI™/DSP serial protocols with SCLK up to 50 MHz - usable either as I/O clock only or as combined I/O and conversion clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete digital codes for high-fidelity signal digitization |
| Sampling Rate | 1 MSPS at +VA = 3–5.5 V - enables real-time capture of fast transients in sensor and control loops |
| INL / DNL | ±0.4 LSB typical - ensures monotonicity and minimal code-width variation across full scale |
| SFDR | 105.3 dB at fIN = 10 kHz - suppresses spurious tones critical for precision measurement in noisy environments |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - supports battery-powered or thermally constrained industrial nodes |
| Input Range | 0 V to VREF (unipolar) - simplifies signal conditioning for grounded-referenced sensors like RTDs and strain gauges |
| Channel Isolation | 109 dB at 50 kHz - prevents crosstalk between +IN0 and +IN1 during multiplexed acquisition |
Pinout & Package
ADS7280IRSAR is packaged in a 4 × 4 mm, 16-pin QFN (RSA) with exposed thermal pad. Pin 1 is REF+ (REFIN); pin 15 is AGND; pin 8 is BDGND; pin 10 is +VBD; pin 11 is +VA; pins 12 and 13 are +IN1 and +IN0 respectively; pin 14 is COM; pin 4 is EOC/INT/CDI; pin 5 is FS/CS; pin 3 is CONVST; pins 6 and 7 are SDI and SDO; pin 9 is SCLK; pin 16 is REF–; pin 2 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (REFIN) | Reference voltage input | Accepts external 0.3–5.5 V reference; sets full-scale range for unipolar conversion |
| +IN0 / +IN1 | Dual analog inputs | Independent noninverting inputs selectable via software or auto mode; share COM as common inverting node |
| COM | Common inverting input | Typically tied to AGND; defines differential baseline for both channels |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge |
| EOC/INT/CDI | Status/data I/O | Configurable as end-of-conversion flag, interrupt output, or daisy-chain data input |
| FS/CS | Frame sync / chip select | Enables SPI slave operation or TMS320 DSP frame synchronization |
| SDI / SDO | Serial data in/out | Full-duplex SPI interface; SDI accepts command bits including reset and channel select |
| SCLK | Serial clock | Supports up to 50 MHz; may serve as both interface clock and conversion clock when enabled |
Key Features
| Feature | Design Value |
|---|---|
| Programmable TAG bit output | Appends channel ID (0 or 1) to each 16-bit conversion result - eliminates external logic for dual-channel traceability |
| Auto/Manual channel select mode | Hardware- or software-controlled MUX sequencing - enables synchronized sampling or independent channel monitoring |
| Built-in conversion clock (CCLK) | 21–24.5 MHz internal oscillator - removes need for external clock source and reduces BOM count |
| Multi-chip daisy-chain mode | Single SCLK/SDO/SDI bus supports cascaded ADCs - simplifies routing and reduces controller GPIO usage |
| Deep power-down mode | 4 µA quiescent current - extends battery life in intermittent-sampling applications such as condition monitoring |
Applications
| Industrial Process Control | Data Acquisition Systems |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow signals from multiple field transmitters in PLC backplanes. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two 4–20 mA loop outputs simultaneously with 14-bit resolution and <10 ps aperture jitter. Use Value: Eliminates external MUX and timing circuitry while maintaining channel isolation >109 dB at 50 kHz for accurate cross-channel correlation. | Use Scenario: High-speed logging of vibration spectra from MEMS accelerometers in predictive maintenance gateways. IC Role / Device Role / Timing Role: SAR converter captures transient waveforms at 1 MSPS with 85.9 dB SNR and 105.3 dB SFDR at 10 kHz. Use Value: Enables FFT-based spectral analysis without external anti-aliasing filters due to 30 MHz small-signal bandwidth. |
| Medical Instrumentation | Magnetometer Interfaces |
Use Scenario: Digitizing low-noise biopotential signals (ECG, EEG) in portable diagnostic devices with strict power budgets. IC Role / Device Role / Timing Role: Unipolar 0–VREF input accepts buffered sensor outputs; deep power-down mode draws only 4 µA between samples. Use Value: Achieves ±0.8 mV offset error at 3 V supply - sufficient for microvolt-level signal fidelity without trimming. | Use Scenario: Reading orthogonal axis outputs from fluxgate or AMR magnetometers in navigation subsystems. IC Role / Device Role / Timing Role: Dual-channel acquisition synchronizes X/Y/Z axis sampling (via third ADC) with programmable TAG bit for channel tagging. Use Value: 109 dB input channel isolation prevents magnetic coupling artifacts during simultaneous axis readout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7279IRSAR | Single-channel version; identical 14-bit SAR core, same package and timing, no MUX or TAG bit | Requires external MUX for dual-sensor systems; lacks channel identification capability | Select when only one analog input is needed and board space must be minimized |
| ADS8329IPWR | 16-bit, 500 kSPS, single-ended input; higher resolution but lower speed and no dual-channel MUX | Not suitable for time-multiplexed dual-sensor acquisition; better for static precision measurements | Choose when absolute accuracy >16-bit is required and throughput ≤500 kSPS is acceptable |
Compared with ADS7279IRSAR and ADS8329IPWR, ADS7280IRSAR uniquely integrates dual-channel selection, TAG bit encoding, and 1-MSPS throughput in a single QFN-16 package - enabling compact, low-latency sensor fusion without external glue logic.
Availability
ADS7280IRSAR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and magnetometer interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADS7280IRSAR 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 IC design.
The ADS7280IRSAR belongs to TI's low-power, high-speed SAR ADC family targeting industrial and medical signal acquisition - engineered for robust performance across –40°C to +85°C with minimal external components.
FAQ
What is the maximum sampling rate of the ADS7280IRSAR under 3V analog supply?
The ADS7280IRSAR achieves 1 MSPS at +VA = 3.0–3.6 V. At 2.7–3.0 V, the maximum rate drops to 900 kSPS when using an external clock. Internal CCLK remains functional across this range, and all AC specifications (SNR, SFDR) are guaranteed at both rates per the datasheet's 3V test conditions.
Does the ADS7280IRSAR require an external reference voltage?
Yes, the ADS7280IRSAR requires an external reference applied between REF+ (pin 1) and REF– (pin 16). The reference voltage must be 0.3–5.5 V and is used to define the unipolar full-scale range (0 V to VREF). No internal reference is provided - VREF directly scales conversion gain and noise performance.
How does the TAG bit function in ADS7280IRSAR daisy-chain mode?
In daisy-chain mode, the ADS7280IRSAR appends a single TAG bit to each 16-bit conversion result: '0' for +IN0 and '1' for +IN1. This bit is transmitted MSB-first on SDO and allows the host controller to identify the source channel without separate address lines or timing windows - simplifying firmware for multi-ADC systems.
Can the ADS7280IRSAR operate with different analog and I/O supply voltages?
Yes. ADS7280IRSAR supports independent supplies: +VA (2.7–5.5 V) powers the analog core and reference input, while +VBD (1.65–5.5 V) powers digital I/O. This allows interfacing with 1.8 V or 3.3 V controllers while maintaining full analog performance - confirmed by separate VIH/VIL specs and tested power dissipation values.
What package options are available for the ADS7280IRSAR?
The ADS7280IRSAR is offered exclusively in the 4 × 4 mm, 16-pin QFN package with wettable flanks (RSA designation). The ordering code "IRSAR" explicitly denotes tape-and-reel packaging of the RSA variant. TSSOP-16 (PW) is available for the ADS7280I family but not for the IRSAR suffix - only QFN is stocked under this part number.
ADS7280IRSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 2
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7280IRSAR FAQ
1.How can I place an order for ADS7280IRSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7280IRSAR 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 ADS7280IRSAR reliable?
The price and inventory of ADS7280IRSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7280IRSAR is usually 5 days.
3.What payment methods are accepted for ADS7280IRSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7280IRSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7280IRSAR?
ADS7280IRSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7280IRSAR 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 ADS7280IRSAR?
For technical support, including ADS7280IRSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7280IRSAR requirements.
6.How does Aetrix verify that ADS7280IRSAR is sourced from the original manufacturer or authorized distributors?
All ADS7280IRSAR 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 ADS7280IRSAR meets industry standards.
7.What is the process for return or replacement of ADS7280IRSAR?
All ADS7280IRSAR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7280IRSAR, 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 ADS7280IRSAR part is unused and in its original packaging.
Return procedure for ADS7280IRSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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