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Texas Instruments ADS7280IRSAT
- Part No.:
- ADS7280IRSAT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7280IRSAT.pdf
- Description:
- IC ADC 14BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
ADS7280IRSAT 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 typical INL/DNL, and supports daisy-chain mode for multi-ADC systems in industrial data acquisition.
For engineers reviewing the ADS7280IRSAT datasheet, ADS7280IRSAT pinout, ADS7280IRSAT application, or ADS7280IRSAT equivalent, key selection criteria include its dual-input MUX architecture, auto/manual channel select capability, 105.3 dB SFDR at 10 kHz, deep power-down mode (4 µA), and QFN-16 package compatibility with space-constrained sensor front-ends.
Technical Context
The ADS7280IRSAT implements a capacitor-based successive approximation register (SAR) core with inherent sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its dual-input MUX enables sequential sampling of +IN0 and +IN1 against COM, with programmable TAG bit indicating active channel in daisy-chain transfers.
It features a built-in 21–24.5 MHz internal conversion clock (CCLK), accepts external SCLK up to 50 MHz, and provides three power-down states-deep (4 µA), nap (0.5 µA), and auto-nap-with global CONVST independent of CS. The EOC/INT/CDI pin offers configurable polarity and duration for interrupt-driven readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 1 MSPS at +VA ≥ 3V - enables real-time capture of fast transients in motor control or power monitoring |
| INL / DNL | ±0.4 LSB typ - ensures monotonicity and minimal code-width variation across full scale |
| SFDR @ 10 kHz | 105.3 dB - suppresses spurious tones critical for precision instrumentation and spectral analysis |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3V, +VBD = 1.8V - supports battery-powered portable test equipment |
| Input Range | 0 V to VREF - unipolar operation simplifies signal conditioning for single-supply sensor interfaces |
| Channel Isolation | 109 dB at 50 kHz - prevents crosstalk between +IN0 and +IN1 during multiplexed acquisition |
Pinout & Package
The ADS7280IRSAT is housed in a 4 × 4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate; pad may be tied to AGND or left floating but must remain isolated from digital ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, REF+ | External reference input | Accepts 0.3 V to +VA reference voltage; sets full-scale range for unipolar conversion |
| 2, NC | No internal connection | Must be left unconnected; no routing or grounding required |
| 3, CONVST | Conversion start trigger | Rising edge freezes sample-and-hold and initiates conversion using internal CCLK |
| 4, EOC/INT/CDI | Status/interrupt/chain input | Configurable as end-of-conversion flag, programmable-duration interrupt, or daisy-chain data input |
| 5, FS/CS | Frame sync / chip select | Active-low SPI slave select; also serves as TMS320 DSP frame sync signal |
| 6, SDI | Serial data input | Accepts command bits for reset, channel select, and EOC/INT configuration |
| 7, SDO | Serial data output | Outputs 16-bit straight-binary result MSB-first; tri-state controlled by CS |
| 8, BDGND | Digital interface ground | Reference for +VBD supply and all digital I/O; must be separated from AGND |
| 9, SCLK | Serial clock input | Drives SPI timing; supports up to 50 MHz for high-throughput daisy-chain reads |
| 10, +VBD | Digital I/O supply | 1.65 V to 5.5 V CMOS-compatible logic supply; decoupling required near pin |
| 11, +VA | Analog supply | 2.7 V to 5.5 V analog core supply; powers SAR, reference buffer, and sample-and-hold |
| 12, +IN1 | Second analog input | Noninverting input for second channel; used with COM in dual-input mode |
| 13, +IN0 | First analog input | Primary noninverting input; selected automatically in auto-channel mode |
| 14, COM | Common inverting input | Shared reference node for both channels; typically tied to AGND or system common |
| 15, AGND | Analog ground | Reference for analog circuitry; requires low-impedance star connection to +VA return |
| 16, REF− | Reference negative input | Must be connected to AGND via dedicated via to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Programmable TAG bit output | Indicates active channel (+IN0 or +IN1) in daisy-chain mode, enabling automatic source identification without host-side tracking |
| Auto/manual channel select mode | Eliminates need for external MUX control logic; auto mode sequences channels on each CONVST, manual mode allows deterministic selection |
| Built-in conversion clock (CCLK) | Removes dependency on external clock generator; internal 21–24.5 MHz oscillator ensures timing consistency across temperature |
| Multi-chip daisy-chain operation | Supports synchronous sampling of up to 16 devices using single SCLK/SDI/FS lines, reducing PCB routing complexity |
| Comprehensive power-down modes | Deep power-down (4 µA) extends battery life in sleep-wake sensor nodes; nap mode retains configuration while halting conversions |
Applications
| Industrial Process Monitoring | Motor Drive Current Sensing |
|---|---|
Use Scenario: Continuous monitoring of multiple analog sensor outputs (e.g., pressure, temperature, flow) in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC performs time-aligned sampling of two sensors per cycle, with TAG bit identifying source in daisy-chained readout. Use Value: Reduces component count vs. two single-channel ADCs; 109 dB channel isolation prevents cross-talk in noisy factory environments. | Use Scenario: Real-time phase current measurement in 3-phase inverter drives using shunt resistors. IC Role / Device Role / Timing Role: Simultaneous sampling of two current paths with <10 ps aperture jitter ensures accurate vector calculation in FOC algorithms. Use Value: 1 MSPS throughput and 105.3 dB SFDR enable clean current reconstruction even under PWM switching noise. |
| Portable Medical Instrumentation | Automated Test Equipment (ATE) |
Use Scenario: Battery-powered ECG or impedance plethysmography devices requiring low-power, high-accuracy analog front-end. IC Role / Device Role / Timing Role: ADC digitizes biopotential signals with 85.9 dB SNR at 10 kHz while operating in nap mode between measurements. Use Value: 13.7 mW power at 3V supply extends runtime; ±0.8 mV offset error at 3V minimizes calibration burden. | Use Scenario: Multi-channel parametric testing of ICs where synchronized acquisition across voltage/current/sense nodes is required. IC Role / Device Role / Timing Role: Acts as master ADC in daisy-chain configuration, providing timestamp-aligned 14-bit results from 8+ channels via single SPI bus. Use Value: Global CONVST enables simultaneous sampling across all chained devices; software reset ensures deterministic startup state. |
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 |
|---|---|---|---|
| ADS7279IRSAT | Single-input (no MUX), identical resolution, speed, and package; lacks +IN1/COM pins and TAG functionality | Used where only one analog input is required per device; not suitable for multiplexed dual-sensor systems | Select when channel count is fixed and board space permits separate ADCs per signal path |
| ADS8329IPWR | 16-bit, 500 kSPS, single-ended input; higher resolution but lower speed and no dual-input MUX | Preferred for DC-critical applications like precision weigh scales where SNR > 90 dB is mandatory | Choose when absolute accuracy outweighs sampling rate and channel flexibility requirements |
Compared with ADS7279IRSAT and ADS8329IPWR, the ADS7280IRSAT uniquely combines dual-input multiplexing, 1-MSPS throughput, and daisy-chain support-making it optimal for compact, multi-sensor industrial data loggers where channel density and synchronization are critical.
Availability
ADS7280IRSAT is available at Aetrix Electronics and suitable for industrial process control, motor drive feedback, portable medical instrumentation, and automated test equipment requiring stable component supply and long-term production continuity.
Supply support for ADS7280IRSAT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The ADS7280IRSAT belongs to TI's low-power, high-speed SAR ADC family designed specifically for precision data acquisition in space- and power-constrained systems operating across –40°C to +85°C.
FAQ
What is the maximum sampling rate of the ADS7280IRSAT and under what supply conditions?
The ADS7280IRSAT achieves 1 MSPS maximum sampling rate when the analog supply +VA is between 3.0 V and 5.5 V. At +VA = 2.7 V to <3.0 V, the maximum rate drops to 900 kSPS. This behavior is specified in the Electrical Characteristics tables and confirmed across both 5 V and 1.8 V timing sections of the datasheet.
Does the ADS7280IRSAT require an external reference voltage, and what are its valid input ranges?
Yes, the ADS7280IRSAT requires an external reference applied between REF+ and REF−. Valid VREF ranges are 0.3 V to +VA, with specific min/max values dependent on +VA and sample rate: e.g., 2.475 V to 2.525 V for fSAMPLE > 500 kSPS at +VA = 2.7 V–3.0 V, or 0.3 V to 3 V for fSAMPLE ≤ 500 kSPS at +VA = 3.0 V–3.6 V.
How does the programmable TAG bit function in the ADS7280IRSAT, and when is it active?
The TAG bit is the MSB (bit 15) of the 16-bit serial output and indicates which input channel (+IN0 or +IN1) was sampled during the most recent conversion. It is active only in daisy-chain mode and reflects the selected channel based on auto/manual configuration; it is not present in standalone SPI readouts.
Can the ADS7280IRSAT operate with separate analog and digital supply voltages, and what are the allowable ranges?
Yes, the ADS7280IRSAT supports independent analog (+VA) and digital interface (+VBD) supplies. +VA ranges from 2.7 V to 5.5 V for analog core operation, while +VBD ranges from 1.65 V to 5.5 V (or up to 1.5×+VA) for CMOS-compatible I/O. BDGND and AGND must be kept separate except at a single-point star ground.
What power-down modes does the ADS7280IRSAT support, and what are their typical current draws?
The ADS7280IRSAT supports three power-down modes: deep power-down (4 µA typical), nap mode (0.5 µA typical), and auto-nap mode (same current as nap). All retain register settings and allow wake-up via CONVST or CS without full reinitialization, making them ideal for intermittent-sampling applications.
ADS7280IRSAT 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:
- -
ADS7280IRSAT FAQ
1.How can I place an order for ADS7280IRSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7280IRSAT 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 ADS7280IRSAT reliable?
The price and inventory of ADS7280IRSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7280IRSAT is usually 5 days.
3.What payment methods are accepted for ADS7280IRSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7280IRSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7280IRSAT?
ADS7280IRSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7280IRSAT 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 ADS7280IRSAT?
For technical support, including ADS7280IRSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7280IRSAT requirements.
6.How does Aetrix verify that ADS7280IRSAT is sourced from the original manufacturer or authorized distributors?
All ADS7280IRSAT 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 ADS7280IRSAT meets industry standards.
7.What is the process for return or replacement of ADS7280IRSAT?
All ADS7280IRSAT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7280IRSAT, 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 ADS7280IRSAT part is unused and in its original packaging.
Return procedure for ADS7280IRSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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