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Texas Instruments ADS7279IPWG4
- Part No.:
- ADS7279IPWG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7279IPWG4.pdf
- Description:
- IC ADC 14BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
ADS7279IPWG4 from Texas Instruments is a low-power, 14-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with unipolar input range (0 V to VREF), SPI/DSP-compatible serial interface, and built-in conversion clock. It operates from 2.7 V to 5.5 V analog supply and delivers ±0.4 LSB typical INL/DNL, 85.9 dB SNR at 10 kHz, and 105.3 dB SFDR - ideal for precision transducer interface and industrial process control systems.
For engineers reviewing the ADS7279IPWG4 datasheet, ADS7279IPWG4 pinout, ADS7279IPWG4 application, or ADS7279IPWG4 equivalent, key selection considerations include its TSSOP-16 package, dual-supply operation (+VA and +VBD), programmable EOC/INT polarity, global CONVST trigger independent of CS, and daisy-chain capability for multi-converter systems.
Technical Context
The ADS7279IPWG4 implements a capacitor-based SAR architecture with inherent sample-and-hold, supporting both manual and auto-triggered conversion modes. Its internal 21–24.5 MHz conversion clock eliminates external timing components while enabling up to 50 MHz SCLK for high-speed serial data transfer.
It features a single-ended unipolar input pair (+IN/–IN), where –IN is typically grounded, and supports flexible reference configuration via REF+ and REF– pins. The device includes three power-down modes (deep, nap, auto-nap) and software reset functionality, all managed through its SPI-compatible interface.
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 ≥ 3 V - enables real-time capture of fast-changing sensor outputs |
| INL / DNL | ±0.4 LSB typical - ensures monotonicity and minimal code-width variation across full scale |
| SNR / SFDR | 85.9 dB / 105.3 dB at 10 kHz - supports clean acquisition of low-distortion signals in noisy environments |
| Supply Range | +VA: 2.7–5.5 V; +VBD: 1.65–5.5 V - allows mixed-voltage system integration with I/O level flexibility |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - suitable for battery-powered or thermally constrained designs |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade reliability without derating |
Pinout & Package
TSSOP-16 package (PW designation), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed thermal pad not connected internally - requires PCB-level grounding decision per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN | Analog input (noninverting) | Primary signal input; referenced to –IN or COM; accepts 0 V to VREF unipolar range |
| –IN | Analog input (inverting) | Typically tied to AGND; defines differential input common-mode point for single-ended use |
| REF+ | Reference voltage input | Accepts external reference (0.3–5.5 V); sets full-scale range for conversion |
| REF– | Reference return | Must be connected to AGND via dedicated via to minimize noise coupling |
| 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 | Programmable as end-of-conversion flag, interrupt output, or daisy-chain data input |
| FS/CS | Frame sync / chip select | Active-low SPI slave select or TMS320 DSP frame sync; controls serial interface enable |
| SCLK | Serial clock input | Supports up to 50 MHz; serves as I/O clock only or combined I/O + conversion clock |
| SDI | Serial data input | Accepts command bits for configuration (e.g., EOC polarity, TAG bit, channel select) |
| SDO | Serial data output | 3-state output delivering 14-bit straight-binary result MSB-first on falling SCLK edge |
| +VA | Analog supply | Powers core ADC and reference circuitry; must be decoupled near pin with 0.1 µF + 10 µF |
| +VBD | Interface supply | Powers digital I/O buffers; independent of +VA to support mixed-voltage host interfaces |
| AGND | Analog ground | Return for analog circuitry; must be separated from BDGND to prevent digital noise injection |
| BDGND | Interface ground | Return for digital I/O; kept isolated from AGND except at single-point system ground |
| NC | No connection | Pin 8 in TSSOP - left unconnected; no internal bond wire or circuit attachment |
| RESERVED | Internal function | Pin 2 in TSSOP - connect to AGND or +VA per datasheet guidance; not user-accessible |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external oscillator; internal 21–24.5 MHz clock enables deterministic timing and reduces BOM count |
| Global CONVST trigger | Starts conversion independently of CS state - simplifies synchronization across multiple devices or with external events |
| Programmable EOC/INT polarity | Allows active-high or active-low status signaling to match host controller GPIO logic requirements without external inverters |
| Daisy-chain mode support | Enables cascaded readout of multiple ADS7279 units using single SCLK/SDI/SDO lines - reduces MCU pin count and routing complexity |
| Three power-down modes | Deep (4 µA), Nap (500 nA), and Auto Nap (triggered post-conversion) - extend battery life in intermittent-sampling applications |
Applications
| Transducer Interface | Industrial Process Control |
|---|---|
Use Scenario: Digitizing output from strain gauges, RTDs, or pressure sensors with millivolt-level signals amplified by instrumentation amplifiers. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC capturing slow-to-moderate bandwidth sensor data with minimal gain/offset drift. Use Value: ±0.4 LSB INL and ±0.8 mV offset error at 3 V ensure <0.01% measurement uncertainty over temperature - critical for calibration-critical systems. | Use Scenario: Monitoring flow, level, or temperature in PLC analog input modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Industrial-grade SAR ADC providing robust, repeatable conversion under wide supply and temperature variation. Use Value: –40°C to +85°C qualification, 70 dB CMRR, and 78 dB PSRR maintain accuracy despite supply ripple and common-mode noise on sensor lines. |
| Medical Instrumentation | Data Acquisition Systems |
Use Scenario: Signal conditioning path in portable ECG or patient monitoring devices requiring low power and high SNR. IC Role / Device Role / Timing Role: Low-power 14-bit ADC sampling biopotential signals at ≤1 kSPS with minimal self-heating and thermal drift. Use Value: 13.7 mW dissipation at 3 V and 85.9 dB SNR at 10 kHz enable >24-hour battery operation while preserving diagnostic waveform fidelity. | Use Scenario: Modular DAQ chassis with multiple synchronized channels for lab-grade test equipment or automated test systems. IC Role / Device Role / Timing Role: Precision ADC node supporting daisy-chain configuration for scalable channel expansion without additional SPI peripherals. Use Value: Multi-chip daisy-chain mode and global CONVST allow simultaneous sampling across 4+ channels using one MCU SPI port and one trigger line. |
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 |
|---|---|---|---|
| ADS7229IPW | 12-bit resolution, 1 MSPS, same TSSOP-16 package and pinout; lower power (8.5 mW @ 3 V) | Lower resolution limits dynamic range - suitable for cost-sensitive, non-precision applications like basic voltage monitoring | Select when 12-bit accuracy suffices and power budget is tighter; retains identical layout and firmware interface |
| ADS8329IPW | 16-bit resolution, 500 kSPS, same TSSOP-16 footprint; higher SNR (89 dB), slower throughput | Higher resolution trades speed for precision - appropriate for high-accuracy, low-bandwidth measurements such as weigh scales | Choose when DC accuracy and noise floor outweigh sampling rate needs; requires firmware update for 16-bit data handling |
Compared with ADS7229IPW and ADS8329IPW, the ADS7279IPWG4 uniquely balances 14-bit resolution, 1 MSPS speed, and ultra-low power - making it optimal for applications demanding both fidelity and responsiveness without sacrificing efficiency.
Availability
ADS7279IPWG4 is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, transducer interface, and data acquisition systems requiring stable component supply and long-term production continuity.
Supply support for ADS7279IPWG4 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 ADS7279 belongs to TI's low-power, high-speed SAR ADC family targeting industrial, medical, and test equipment applications where accuracy, speed, and power efficiency must coexist - exemplified by its integrated CCLK, flexible supply domains, and robust noise immunity.
FAQ
What is the maximum sampling rate of the ADS7279IPWG4 under 3 V analog supply?
The ADS7279IPWG4 achieves a maximum sampling rate of 1 MSPS 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 due to internal timing constraints. This behavior is fully specified in the Electrical Characteristics tables and validated across the –40°C to +85°C temperature range. The ADS7279IPWG4 maintains full 14-bit performance at both rates.
Does the ADS7279IPWG4 require an external reference voltage?
Yes, the ADS7279IPWG4 requires an external reference voltage applied between REF+ and REF– pins. It does not include an internal reference. The reference range is 0.3 V to +VA, with typical values of 2.5 V (at +VA = 3 V) or 5 V (at +VA = 5 V). Reference input resistance is 40 kΩ, and REF– must be connected directly to AGND via a dedicated via to preserve accuracy. The ADS7279IPWG4's performance metrics (INL, SNR, etc.) are specified with these external references.
Can the ADS7279IPWG4 operate with different analog and I/O supply voltages?
Yes, the ADS7279IPWG4 supports independent analog (+VA) and buffer I/O (+VBD) supplies. +VA ranges from 2.7 V to 5.5 V for the ADC core, while +VBD ranges from 1.65 V to 5.5 V (or up to 1.5×+VA) for digital I/O. This dual-supply architecture allows interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers without level shifters. The ADS7279IPWG4's VIH/VIL thresholds scale with +VBD, ensuring reliable logic communication across voltage domains.
How does the daisy-chain mode work on the ADS7279IPWG4?
In daisy-chain mode, multiple ADS7279IPWG4 devices share SCLK, SDI, and FS/CS lines. The EOC/INT/CDI pin of each downstream device connects to the SDI pin of the next, forming a serial data path. A single SCLK sequence clocks out 14 bits from each device sequentially. The ADS7279IPWG4 supports this mode natively via its configurable CDI function and does not require external glue logic. All devices must use the same SCLK frequency and be triggered simultaneously via global CONVST.
What power-down modes are available on the ADS7279IPWG4 and how are they controlled?
The ADS7279IPWG4 offers three power-down modes: Deep Power-Down (4 µA), Nap (500 nA), and Auto Nap (activated automatically after conversion completes). These are controlled via SPI commands written to the configuration register - no hardware pin toggling is required. The ADS7279IPWG4 exits Deep and Nap modes upon CS assertion; Auto Nap exits on next CONVST pulse. All modes retain register settings and require no reinitialization, enabling rapid wake-up in event-driven sampling systems.
ADS7279IPWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
ADS7279IPWG4 FAQ
1.How can I place an order for ADS7279IPWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7279IPWG4 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 ADS7279IPWG4 reliable?
The price and inventory of ADS7279IPWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7279IPWG4 is usually 5 days.
3.What payment methods are accepted for ADS7279IPWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7279IPWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7279IPWG4?
ADS7279IPWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7279IPWG4 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 ADS7279IPWG4?
For technical support, including ADS7279IPWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7279IPWG4 requirements.
6.How does Aetrix verify that ADS7279IPWG4 is sourced from the original manufacturer or authorized distributors?
All ADS7279IPWG4 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 ADS7279IPWG4 meets industry standards.
7.What is the process for return or replacement of ADS7279IPWG4?
All ADS7279IPWG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7279IPWG4, 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 ADS7279IPWG4 part is unused and in its original packaging.
Return procedure for ADS7279IPWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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