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Texas Instruments ADS7279IRSAT
- Part No.:
- ADS7279IRSAT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ADS7279IRSAT.pdf
- Description:
- IC ADC 14BIT SAR 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,290
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Product details
Overview
ADS7279IRSAT 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 (–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 interfaces and data acquisition systems requiring high linearity and low power.
For engineers reviewing the ADS7279IRSAT datasheet, ADS7279IRSAT pinout, ADS7279IRSAT application, or ADS7279IRSAT equivalent, key selection criteria include unipolar input range (0 V to VREF), deep power-down mode (4 µA), daisy-chain capability, and QFN-16 package compatibility with tight layout constraints in industrial sensor nodes and medical instrumentation.
Technical Context
The ADS7279IRSAT implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, supporting both manual (CONVST-triggered) and auto-triggered conversion modes. Its internal 21–24.5 MHz conversion clock eliminates external timing components while enabling 1 MSPS throughput at 5V or 900 kSPS at 2.7V.
It uses a dual-supply architecture: +VA (2.7–5.5 V) powers the analog core and reference path, while +VBD (1.65–5.5 V) supplies digital I/O logic. The device supports programmable EOC/INT polarity, global CONVST independent of CS, and optional TAG bit output for multi-device synchronization in daisy-chain configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization in precision measurement. |
| Sampling Rate | 1 MSPS at +VA ≥ 3 V - enables real-time capture of fast transducer outputs or control-loop feedback signals. |
| INL / DNL | ±0.4 LSB typical - ensures monotonicity and minimal code-width variation critical for closed-loop control accuracy. |
| SNR | 85.9 dB at fIN = 10 kHz - supports >13.5 effective number of bits (ENOB) in low-noise sensor front-ends. |
| Power Dissipation | 13.7 mW at 1 MSPS, +VA = 3 V, +VBD = 1.8 V - allows battery-powered or thermally constrained embedded designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial process control, motor drives, and outdoor instrumentation environments. |
| Reference Input | 0.3 V to +VA - accepts externally generated references (e.g., 2.5 V or 5 V) for flexible full-scale scaling. |
Pinout & Package
ADS7279IRSAT is housed in a 4 × 4 mm, 16-pin QFN package (RSA) with exposed thermal pad internally connected to substrate. Pin 1 is REF+ (REFIN); pins 15 (AGND) and 8 (BDGND) are separate analog and digital ground terminals; pin 12 is RESERVED and must be tied to AGND or +VA per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (REFIN) | External reference input | Accepts precision voltage reference (0.3 V to +VA); defines full-scale range for unipolar conversion. |
| +IN | Analog input (noninverting) | Differential input pair with –IN; supports single-ended use when –IN is grounded. |
| –IN | Analog input (inverting) | Commonly tied to AGND for unipolar operation; enables true differential input if required. |
| CONVST | Conversion start trigger | Edge-sensitive input that freezes S/H and initiates conversion on next internal clock rising edge. |
| EOC/INT/CDI | Status/output configurable pin | Programmable as end-of-conversion flag (active-low default) or interrupt; doubles as chain-data input in daisy-chain mode. |
| FS/CS | Frame sync / chip select | Enables SPI or TMS320 DSP interface; controls serial data transfer initiation and device selection. |
| SCLK | Serial clock input | Supports up to 50 MHz external clock; serves as I/O clock only or combined I/O + conversion clock. |
| SDI / SDO | Serial data in/out | SDI accepts command bits (e.g., reset, channel select); SDO outputs 14-bit straight-binary result MSB-first. |
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 (18 CCLK). |
| Three power-down modes | Deep power-down (4 µA), Nap (0.3–0.5 mA), and Auto Nap reduce idle current without sacrificing wake-up latency. |
| Global CONVST independent of CS | Allows synchronized sampling across multiple ADS7279 devices even when CS is asserted individually. |
| Daisy-chain mode support | Enables cascaded readout of multiple converters using single SCLK/SDO/SDI lines - reduces PCB routing complexity. |
| Programmable EOC/INT polarity | Configurable active-high/low status output simplifies integration with diverse host controller interrupt logic. |
Applications
| Industrial Process Monitoring | Medical Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, or flow sensors in PLC-based control cabinets with limited thermal headroom. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from 4–20 mA transducers at 1 MSPS with <10 ps aperture jitter. Use Value: ±0.4 LSB INL ensures accurate calibration traceability; 13.7 mW dissipation avoids local heating-induced drift in sealed enclosures. | Use Scenario: High-resolution acquisition of bio-potential signals (ECG, EEG) in portable diagnostic equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, low-power ADC capturing differential electrode inputs with 85.9 dB SNR at 10 kHz. Use Value: Deep power-down mode (4 µA) extends battery life between measurements; unipolar 0–VREF input matches rail-to-rail amplifier output stages. |
| Automated Test Equipment | Magnetometer Signal Conditioning |
Use Scenario: Modular ATE slot card requiring multi-channel synchronized sampling with minimal board space and no external clock tree. IC Role / Device Role / Timing Role: Precision ADC operating in daisy-chain mode with global CONVST to align sampling across 8+ channels. Use Value: Built-in CCLK and programmable TAG bit enable deterministic inter-device timing alignment without FPGA-generated clocks. | Use Scenario: Digitizing low-level magnetic field outputs from fluxgate or AMR sensors in navigation-grade IMUs. IC Role / Device Role / Timing Role: High-linearity ADC converting microvolt-level differential signals amplified by low-drift instrumentation amplifiers. Use Value: ±0.4 LSB DNL prevents missing codes during slow-slewing field transitions; 70 dB CMRR suppresses common-mode noise from nearby switching regulators. |
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 |
|---|---|---|---|
| ADS7280IRSAT | Dual-channel 2:1 MUX input; adds COM pin and +IN0/+IN1; identical speed, resolution, and package. | Requires channel sequencing logic; suited for multiplexed sensor arrays rather than single-input systems. | Select ADS7280IRSAT only when dual-input sampling or automatic channel selection is needed - not a drop-in replacement. |
| ADS8329IPWR | 16-bit resolution, 500 kSPS, higher SNR (89 dB), but larger TSSOP-16 package and no built-in CCLK. | Higher precision at lower speed; requires external clock and occupies more PCB area. | Choose ADS8329IPWR when ENOB >14 bits is mandatory and throughput ≤500 kSPS suffices. |
Compared with ADS7280IRSAT, ADS7279IRSAT offers simpler single-input topology and smaller software overhead; versus ADS8329IPWR, it trades 2-bit resolution for 2× speed, integrated clocking, and lower power - making it optimal for cost- and size-constrained 14-bit real-time systems.
Availability
ADS7279IRSAT is available at Aetrix Electronics and suitable for industrial process control, portable medical instrumentation, and automated test equipment requiring stable component supply, long-term manufacturability, and guaranteed industrial-temperature performance.
Supply support for ADS7279IRSAT 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, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The ADS7279 belongs to TI's low-power, high-speed SAR ADC family designed for precision data acquisition in space- and power-constrained systems where accuracy, speed, and integration are jointly critical.
FAQ
What is the maximum sampling rate of the ADS7279IRSAT under 3V analog supply?
The ADS7279IRSAT achieves 900 kSPS when +VA is between 2.7 V and 3.0 V, and 1 MSPS when +VA is 3.0 V to 5.5 V. This dual-rate behavior is specified in the Electrical Characteristics table for 2.7–3.6 V operation, with timing validated at 3V using internal CCLK. The ADS7279IRSAT maintains full 14-bit performance across both ranges.
Does the ADS7279IRSAT require an external reference voltage?
Yes, the ADS7279IRSAT requires an external reference applied between REF+ (pin 1) and REF– (pin 16). The reference voltage must be within 0.3 V to +VA and can be 2.5 V or 5 V depending on system full-scale needs. The ADS7279IRSAT does not include an internal reference; its accuracy directly depends on reference stability and noise performance.
Can the ADS7279IRSAT operate in daisy-chain mode with other ADCs?
Yes, the ADS7279IRSAT supports daisy-chain mode using the EOC/INT/CDI pin as chain-data input and SDO as chain-data output. Multiple ADS7279IRSAT devices can be cascaded on a single SPI bus, with CS asserted sequentially and global CONVST synchronizing sampling. This configuration reduces GPIO count and simplifies firmware for multi-channel systems.
What is the function of the RESERVED pin (pin 12) on the ADS7279IRSAT?
The RESERVED pin (pin 12) on the ADS7279IRSAT must be externally connected to either AGND or +VA per the datasheet recommendation. It is not left floating. This connection stabilizes internal bias networks and ensures specified AC performance; failure to tie it may degrade SNR or cause timing uncertainty in high-speed operation.
How does the power-down functionality work in the ADS7279IRSAT?
The ADS7279IRSAT offers three power-down states: Deep Power-Down (4 µA), Nap (0.3–0.5 mA), and Auto Nap (automatically entered after conversion). Entry is controlled via SPI command or hardware pin configuration. Wake-up time is under 1 µs from Nap and ~10 µs from Deep mode, preserving system responsiveness while minimizing quiescent current in idle periods - critical for battery-operated ADS7279IRSAT deployments.
ADS7279IRSAT 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:
- 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-QFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7279IRSAT FAQ
1.How can I place an order for ADS7279IRSAT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7279IRSAT 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 ADS7279IRSAT reliable?
The price and inventory of ADS7279IRSAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7279IRSAT is usually 5 days.
3.What payment methods are accepted for ADS7279IRSAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7279IRSAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7279IRSAT?
ADS7279IRSAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7279IRSAT 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 ADS7279IRSAT?
For technical support, including ADS7279IRSAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7279IRSAT requirements.
6.How does Aetrix verify that ADS7279IRSAT is sourced from the original manufacturer or authorized distributors?
All ADS7279IRSAT 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 ADS7279IRSAT meets industry standards.
7.What is the process for return or replacement of ADS7279IRSAT?
All ADS7279IRSAT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7279IRSAT, 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 ADS7279IRSAT part is unused and in its original packaging.
Return procedure for ADS7279IRSAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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