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Texas Instruments ADS7279IPWR
- Part No.:
- ADS7279IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7279IPWR.pdf
- Description:
- IC ADC 14BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,413
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Product details
Overview
ADS7279IPWR from Texas Instruments is a low-power, 14-bit, 1-MSPS unipolar-input successive approximation register (SAR) analog-to-digital converter with SPI/DSP-compatible serial interface, built-in conversion clock, and industrial temperature range (–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.
For engineers reviewing the ADS7279IPWR datasheet, ADS7279IPWR pinout, ADS7279IPWR application, or ADS7279IPWR equivalent, this device supports high-accuracy data acquisition in power-constrained industrial systems requiring stable DC performance, low-noise sampling, and daisy-chain capability across multiple converters.
Technical Context
The ADS7279IPWR implements a capacitor-based SAR architecture with inherent 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 while enabling up to 1 MSPS throughput at 5V or 900 kSPS at 2.7V.
It uses dual-supply operation: +VA (2.7–5.5 V) for analog circuitry and +VBD (1.65–5.5 V) for digital I/O, with separate AGND and BDGND pins to minimize noise coupling. The unipolar input range is 0 V to VREF, with REF+ and REF– accepting external references from 0.3 V to +VA.
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 sensor and control loops |
| INL / DNL | ±0.4 LSB typical - ensures monotonicity and minimal code-width variation across full scale |
| SNR | 85.9 dB at fIN = 10 kHz - supports >13.9 effective number of bits (ENOB) in precision measurement |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3V, +VBD = 1.8V - suitable for battery-powered or thermally constrained designs |
| Operating Temp | –40°C to +85°C - qualified for industrial automation, motor control, and outdoor instrumentation |
| Reference Input | 0.3 V to +VA - allows flexible scaling with external precision references (e.g., 2.5 V or 5 V) |
Pinout & Package
TSSOP-16 package (PW designation), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad internally connected to substrate (recommended to connect to AGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VA | Analog supply | Primary analog domain power (2.7–5.5 V); must be filtered near pin to reduce noise coupling into SAR core |
| +VBD | Digital I/O supply | Independent buffer supply (1.65–5.5 V); decoupling required to maintain logic integrity during SDO transitions |
| AGND | Analog ground | Return path for analog circuitry; must be separated from digital ground except at single-point star connection |
| BDGND | Digital interface ground | Reference for SDI/SDO/SCLK/FS/CS; ties to +VBD return, not AGND, to isolate digital switching noise |
| +IN / –IN | Differential analog input | +IN accepts signal; –IN typically grounded for unipolar mode - defines 0 V to VREF input range |
| REF+ / REF– | External reference inputs | Accepts buffered reference voltage; REF– must connect to AGND via dedicated via to minimize ground bounce |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes sample-and-hold and initiates conversion on next internal clock edge |
| FS/CS | Frame sync / chip select | Active-low SPI slave select; also serves as frame sync for TMS320 DSP interfaces |
| SCLK | Serial clock input | Supports up to 50 MHz externally; used for both interface timing and internal conversion clock when configured |
| SDI | Serial data input | Accepts configuration commands (e.g., EOC polarity, TAG bit enable) and software reset instructions |
| SDO | Serial data output | 3-state output delivering 16-bit straight-binary result MSB-first; compatible with daisy-chain mode |
| EOC/INT/CDI | Status & chain input | Programmable as end-of-conversion flag or interrupt; functions as chain data input in multi-device daisy-chain |
| NC | No connection | Pin 8 in TSSOP - must remain unconnected; no internal bond wire or circuitry attached |
| RESERVED | Internal function | Pin 2 in TSSOP - connect to AGND or +VA per datasheet; not user-accessible for signal routing |
Key Features
| Feature | Design Value |
|---|---|
| Built-in conversion clock (CCLK) | Eliminates need for external oscillator; internal 21–24.5 MHz clock enables deterministic 18-cycle conversion time |
| Multi-chip daisy-chain mode | Allows synchronous sampling and serial readout of multiple ADS7279 devices using single SCLK/SDI/SDO lines |
| Three power-down modes | Deep power-down (4 µA), Nap (0.5 µA), and Auto Nap (self-activated between conversions) extend battery life |
| Programmable EOC/INT polarity | Configurable active-high/low status output simplifies integration with FPGA or microcontroller interrupt logic |
| Global CONVST with independent CS | Enables simultaneous sampling across multiple converters without requiring synchronized chip-select signals |
Applications
| Industrial Process Control | Medical Instrumentation |
|---|---|
Use Scenario: Monitoring pressure, flow, and temperature sensors in PLC-based control cabinets with limited board space and thermal budget. IC Role / Device Role / Timing Role: Primary ADC for analog sensor front-end; provides 14-bit resolution and <10 ps aperture jitter to preserve signal fidelity during closed-loop feedback. Use Value: ±0.4 LSB INL ensures accurate calibration traceability; 13.7 mW power at 3V enables fanless enclosure design. | Use Scenario: Digitizing ECG, EEG, and patient vital sign waveforms in portable diagnostic equipment requiring low noise and low power. IC Role / Device Role / Timing Role: High-fidelity signal acquisition stage; unipolar input simplifies anti-aliasing filter design for biopotential signals referenced to system ground. Use Value: 85.9 dB SNR at 10 kHz meets IEC 60601-2-27 requirements for clinical-grade waveform fidelity. |
| Data Acquisition Systems | Transducer Interface |
Use Scenario: Modular DAQ modules for test benches capturing multi-channel sensor data with synchronized sampling and SPI streaming. IC Role / Device Role / Timing Role: Single-ended 14-bit ADC with daisy-chain support; enables scalable channel count without additional SPI peripherals. Use Value: 1 MSPS throughput and global CONVST allow time-aligned sampling across 8+ channels using one master clock. | Use Scenario: Interfacing strain gauges, RTDs, and LVDTs in structural health monitoring nodes powered by energy harvesting. IC Role / Device Role / Timing Role: Precision unipolar ADC with programmable reference input; accommodates 2.5 V or 5 V excitation sources and ratiometric measurements. Use Value: ±0.8 mV offset error at 3V ensures <0.03% FSR error in 10-bit-equivalent bridge measurements without trimming. |
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, 4×4 mm QFN-16 package with exposed thermal pad; 3000-unit tape-and-reel packaging | Higher thermal conductivity (θJA = 47°C/W vs. 86°C/W) suits continuous 1 MSPS operation in compact enclosures | Select IRSAR for thermally demanding, space-constrained layouts where PCB area and junction temperature are critical |
| ADS8329IPWR | 16-bit, 500 kSPS SAR ADC; higher resolution but lower speed; 2.7–5.5 V supply; SPI interface; same TSSOP-16 footprint | Better DC accuracy (±0.5 LSB INL) but half the throughput; suited for static or slow-varying measurements | Select IPWR if 16-bit resolution outweighs 1 MSPS requirement - e.g., precision weigh scales or calibration standards |
Compared with ADS7279IRSAR, the ADS7279IPWR offers identical electrical performance but higher thermal resistance due to TSSOP packaging, limiting sustained 1 MSPS use above 65°C ambient. Compared with ADS8329IPWR, it trades 2 bits of resolution for double the sampling rate and lower power at full speed.
Availability
ADS7279IPWR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, data acquisition systems, and transducer interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS7279IPWR 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 and medical signal acquisition; it was engineered to deliver 14-bit accuracy with sub-15 mW power at 1 MSPS while maintaining robust noise immunity and flexible digital interfacing.
FAQ
What is the maximum sampling rate of the ADS7279IPWR under 3V analog supply conditions?
The ADS7279IPWR achieves 1 MSPS maximum sampling rate when +VA is 3.0 V or higher. At 2.7 V ≤ +VA < 3.0 V, the maximum rate drops to 900 kSPS due to internal clock frequency derating. This behavior is specified in the Electrical Characteristics table for 2.7–3.6 V operation and confirmed in timing diagrams Figure 1–3.
Does the ADS7279IPWR support true differential input operation?
No, the ADS7279IPWR is a unipolar-input ADC. Its +IN and –IN pins implement pseudo-differential input topology where –IN is intended for grounding or common-mode reference, not active differential signaling. True differential input capability is provided only by the ADS7280 variant, which includes COM and dual +IN0/+IN1 inputs.
Can the ADS7279IPWR operate with a 1.8V digital I/O supply (+VBD)?
Yes, the ADS7279IPWR supports +VBD from 1.65 V to 5.5 V, including 1.8 V. At +VBD = 1.8 V and +VA = 3 V, it draws only 0.1–0.5 mA I/O supply current and dissipates 13.7 mW total - making it suitable for mixed-voltage systems interfacing with 1.8 V FPGAs or microcontrollers.
How does the daisy-chain mode work on the ADS7279IPWR?
In daisy-chain mode, multiple ADS7279IPWR devices share SCLK, SDI, and FS/CS lines. The SDO of each device connects to the SDI of the next. A single 16 × N-bit SPI frame reads all N converters' results sequentially, with EOC/INT/CDI repurposed as chain data input on downstream devices. Global CONVST ensures synchronized sampling.
What is the purpose of the RESERVED pin (Pin 2) on the ADS7279IPWR TSSOP package?
The RESERVED pin (TSSOP Pin 2) has no user-accessible function and must be connected either to AGND or +VA per the datasheet recommendation. It is not an NC pin - leaving it floating may cause undefined behavior. This pin is reserved for internal test or future functionality and must not be used for signal routing or decoupling.
ADS7279IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
ADS7279IPWR FAQ
1.How can I place an order for ADS7279IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7279IPWR 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 ADS7279IPWR reliable?
The price and inventory of ADS7279IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7279IPWR is usually 5 days.
3.What payment methods are accepted for ADS7279IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7279IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7279IPWR?
ADS7279IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7279IPWR 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 ADS7279IPWR?
For technical support, including ADS7279IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7279IPWR requirements.
6.How does Aetrix verify that ADS7279IPWR is sourced from the original manufacturer or authorized distributors?
All ADS7279IPWR 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 ADS7279IPWR meets industry standards.
7.What is the process for return or replacement of ADS7279IPWR?
All ADS7279IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7279IPWR, 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 ADS7279IPWR part is unused and in its original packaging.
Return procedure for ADS7279IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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