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Texas Instruments ADS7279IPW
- Part No.:
- ADS7279IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7279IPW.pdf
- Description:
- IC ADC 14BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,024
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Product details
Overview
ADS7279IPW from Texas Instruments is a low-power, 14-bit, 1-MSPS unipolar-input SAR analog-to-digital converter with SPI/DSP-compatible serial interface, built-in conversion clock, and industrial-grade operation from –40°C to +85°C. It features ±0.4 LSB typical INL/DNL, 85.9 dB SNR at 10 kHz, and operates from 2.7V to 5.5V analog supply - used in precision transducer interface and industrial data acquisition systems.
For engineers reviewing the ADS7279IPW datasheet, ADS7279IPW pinout, ADS7279IPW application, or ADS7279IPW equivalent, key selection considerations include its single-ended unipolar input architecture, TSSOP-16 package compatibility, 1.65V–5.5V I/O supply flexibility, and daisy-chain support for multi-channel sampling systems.
Technical Context
The ADS7279IPW implements a capacitor-based successive approximation register (SAR) ADC with integrated sample-and-hold, supporting manual or auto-triggered conversions via CONVST and FS/CS control. Its internal 21–24.5 MHz conversion clock eliminates external timing components.
It uses a unipolar input range of 0 V to VREF, accepts external reference inputs (REF+ and REF−), and delivers straight-binary output over an SPI-compatible 4-wire serial interface (SCLK, SDI, SDO, FS/CS) with programmable EOC/INT polarity and TAG bit capability.
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 - supports real-time capture of fast analog waveforms |
| INL / DNL | ±0.4 LSB typical - ensures monotonicity and minimal code-width deviation across full scale |
| SNR | 85.9 dB at fIN = 10 kHz - enables clean digitization of low-noise sensor signals |
| Offset Error | ±0.8 mV max at 3 V supply - reduces calibration burden in precision measurement front-ends |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - suitable for battery-powered or thermally constrained designs |
| Supply Range | +VA: 2.7–5.5 V; +VBD: 1.65–5.5 V - allows mixed-voltage system integration with 1.8 V or 3.3 V logic |
Pinout & Package
TSSOP-16 package with exposed thermal pad (not electrically connected); pin 1 marked by dot; NC pins must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+VA) | Analog supply input | Provides power to analog core; requires local 0.1 µF bypass to AGND |
| 3 (+IN) | Differential noninverting input | Accepts unipolar analog input referenced to –IN (typically AGND) |
| 4 (–IN) | Differential inverting input | Typically tied to AGND; defines 0 V reference for unipolar input range |
| 5 (FS/CS) | Frame sync / chip select | Active-low SPI slave select; initiates serial readout sequence |
| 6 (SDI) | Serial data input | Accepts configuration commands (e.g., reset, polarity setup) and channel select bits |
| 7 (SDO) | Serial data output | Delivers 14-bit conversion result MSB-first on falling SCLK edge |
| 9 (CONVST) | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and launches conversion |
| 10 (+VBD) | Buffer/digital I/O supply | Independent rail for digital interface; decoupled from +VA to reduce noise coupling |
| 11 (AGND) | Analog ground | Reference return for analog circuitry; must be star-connected and isolated from BDGND |
| 13 (REF+) | External reference positive | Accepts precision voltage reference (0.3–5.5 V); sets full-scale range |
| 14 (REF–) | External reference negative | Connected directly to AGND via low-inductance path to minimize reference error |
| 15 (BDGND) | Buffer/digital ground | Return for +VBD-supplied logic; kept separate from AGND to prevent digital noise injection |
| 16 (NC) | No connection | Internally unconnected; must be left floating or tied to AGND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external oscillator; internal 21–24.5 MHz clock enables self-timed conversion |
| Programmable EOC/INT polarity | Allows synchronization with host processor interrupt logic without external inverters |
| Daisy-chain mode support | Enables cascaded readout of multiple ADS7279IPW devices using single SDO/SDI line |
| Deep/Nap power-down modes | Reduces current to 4 µA (deep) or 500 nA (nap), extending battery life in intermittent-sampling applications |
| Global CONVST independent of CS | Supports simultaneous sampling across multiple converters even when CS is deasserted |
Applications
| Industrial Process Monitoring | Medical Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing 4–20 mA loop outputs and bridge transducer signals with 14-bit resolution. Use Value: ±0.4 LSB INL and 85.9 dB SNR ensure accurate representation of small signal variations under noisy factory conditions. | Use Scenario: Signal conditioning in portable ECG and pulse oximetry modules requiring low power and high fidelity. IC Role / Device Role / Timing Role: Front-end ADC capturing biopotential waveforms at up to 1 MSPS with minimal added noise. Use Value: 13.7 mW power at 3 V enables >24-hour battery operation while maintaining diagnostic-grade SNR. |
| Magnetometer Data Acquisition | Automated Test Equipment (ATE) |
Use Scenario: High-resolution magnetic field mapping in handheld gaussmeters and navigation calibrators. IC Role / Device Role / Timing Role: Digitizing low-level differential outputs from fluxgate or AMR sensors with precise DC accuracy. Use Value: ±0.8 mV offset error at 3 V and ±0.4 LSB DNL preserve nanotesla-level resolution without frequent recalibration. | Use Scenario: Multi-channel stimulus-response measurement in benchtop ATE platforms with synchronized sampling. IC Role / Device Role / Timing Role: One of several parallel ADCs in daisy-chain configuration, sharing SCLK and CS lines. Use Value: Global CONVST and daisy-chain capability enable deterministic, jitter-free multi-device sampling at 1 MSPS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7279IRSAR | Same silicon, QFN-16 package (4 × 4 mm); lower thermal resistance (θJA = 47 °C/W vs 86 °C/W) | Better suited for space-constrained PCBs and higher ambient temperature environments | Select IRSAR for compact layouts or thermal-limited enclosures; PW offers easier hand-soldering and test access |
| ADS8329IPW | 16-bit resolution, 500 kSPS, no internal CCLK; requires external clock; higher SNR (91 dB) | Used where ultimate DC precision and dynamic range outweigh speed and integration needs | Choose ADS8329IPW when 16-bit resolution and <±0.5 ppm/°C gain drift are mandatory; ADS7279IPW preferred for 1 MSPS + integrated clock |
Compared with ADS7279IRSAR, the ADS7279IPW trades thermal performance for mechanical serviceability; versus ADS8329IPW, it sacrifices 2 bits of resolution and 4 dB SNR to gain 2× throughput and eliminate external clock dependency.
Availability
ADS7279IPW is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and magnetometer data acquisition requiring stable component supply and long-term manufacturability.
Supply support for ADS7279IPW 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 ADS7279IPW belongs to TI's low-power, high-speed SAR ADC family targeting precision measurement applications - engineered for robust performance across wide temperature and supply ranges without external timing components.
FAQ
What is the maximum sampling rate of the ADS7279IPW at 3V analog supply?
The ADS7279IPW achieves 1 MSPS maximum sampling rate when the analog supply (+VA) is between 3.0 V and 5.5 V. At 2.7 V ≤ +VA < 3.0 V, the maximum rate drops to 900 kSPS. This behavior is defined by internal clock generation limits and is fully specified in the electrical characteristics tables of the ADS7279IPW datasheet.
Does the ADS7279IPW require an external reference voltage?
Yes, the ADS7279IPW requires an external reference voltage applied between REF+ and REF– pins. The reference range is 0.3 V to +VA, with typical use cases at 2.5 V (for 3 V supplies) or 5 V (for 5 V supplies). The device does not include an internal reference; REF– must be connected directly to AGND through a low-inductance path to maintain accuracy.
Can the ADS7279IPW operate in daisy-chain mode with other ADCs?
Yes, the ADS7279IPW supports daisy-chain mode using the EOC/INT/CDI pin as chain data input and SDO as chain data output. Multiple ADS7279IPW devices can share one SCLK and FS/CS line, with conversion results shifted out sequentially. This mode is confirmed in the functional description and timing diagrams of the ADS7279IPW datasheet.
What are the power-down current levels for the ADS7279IPW?
The ADS7279IPW offers three power-down states: Deep power-down draws 0.004 µA typical, Nap mode draws 0.3 µA typical, and Auto Nap mode activates automatically between conversions. These values are measured at +VA = 5 V and +VBD = 1.8 V, and are specified across the full industrial temperature range in the ADS7279IPW electrical characteristics table.
Is the ADS7279IPW pin-compatible with the ADS7280IPW?
No, the ADS7279IPW is not pin-compatible with the ADS7280IPW. While both use the TSSOP-16 package, ADS7280IPW repurposes pins 2 and 14 as +IN1 and COM (dual-input MUX), whereas ADS7279IPW assigns those as RESERVED and –IN. Pin functions differ significantly; PCB layout must be redesigned when substituting between these variants.
ADS7279IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7279IPW FAQ
1.How can I place an order for ADS7279IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7279IPW 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 ADS7279IPW reliable?
The price and inventory of ADS7279IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7279IPW is usually 5 days.
3.What payment methods are accepted for ADS7279IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7279IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7279IPW?
ADS7279IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7279IPW 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 ADS7279IPW?
For technical support, including ADS7279IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7279IPW requirements.
6.How does Aetrix verify that ADS7279IPW is sourced from the original manufacturer or authorized distributors?
All ADS7279IPW 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 ADS7279IPW meets industry standards.
7.What is the process for return or replacement of ADS7279IPW?
All ADS7279IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS7279IPW, 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 ADS7279IPW part is unused and in its original packaging.
Return procedure for ADS7279IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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