Texas Instruments ADS7279IPWRG4

Overview

ADS7279IPWRG4 from Texas Instruments is a low-power, 14-bit, 1-MSPS unipolar 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 - used in precision transducer interface and industrial data acquisition systems.

For engineers reviewing the ADS7279IPWRG4 datasheet, ADS7279IPWRG4 pinout, ADS7279IPWRG4 application, or ADS7279IPWRG4 equivalent, key selection considerations include unipolar input range (0 V to VREF), deep power-down mode (4 µA), daisy-chain capability, and TSSOP-16 package compatibility with legacy board layouts.

Technical Context

The ADS7279IPWRG4 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 50 MHz SCLK for high-speed serial readout.

It uses separate analog (+VA) and digital buffer (+VBD) supplies (1.65 V to 5.5 V), supports programmable EOC/INT polarity and TAG bit output, and provides global CONVST independent of chip select - simplifying synchronization in multi-converter systems.

Key Specifications

Pinout & Package

TSSOP-16 package (PW designation) with exposed thermal pad not connected internally; requires PCB-level grounding per TI layout guidelines. Pin 1 is REF+, pin 16 is REF–; BDGND (pin 8) and AGND (pin 5) must be separated on PCB to minimize digital noise coupling into analog path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS7279IPWR and ADS8329IPWR, the ADS7279IPWRG4 uniquely combines 14-bit/1-MSPS performance, integrated clock, daisy-chain support, and RoHS-compliant packaging - making it optimal for cost-sensitive, space-constrained industrial DAQ nodes requiring rapid deployment and regulatory alignment.

Availability

ADS7279IPWRG4 is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, and transducer interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ADS7279IPWRG4 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 ADS7279IPWRG4 belongs to TI's low-power, high-speed SAR ADC family targeting industrial, medical, and test equipment where accuracy, speed, and power efficiency intersect - designed specifically for unipolar sensor signal digitization with minimal external components.

FAQ

What is the maximum sampling rate of the ADS7279IPWRG4 under 3V analog supply conditions?

The ADS7279IPWRG4 achieves 1 MSPS sampling rate when +VA is between 3.0 V and 3.6 V. At 2.7 V ≤ +VA < 3.0 V, the maximum rate drops to 900 kSPS due to internal clock frequency scaling. This behavior is specified in the Electrical Characteristics table for 2.7 V–3.6 V operation and confirmed in timing diagrams Figure 1–3 of the SBAS436A datasheet. The ADS7279IPWRG4 maintains full 14-bit performance across both ranges.

Does the ADS7279IPWRG4 support true differential input mode?

Yes, the ADS7279IPWRG4 supports true differential input using +IN (pin 3) and –IN (pin 4), with unipolar full-scale range defined as (+IN) – (–IN). The device does not support bipolar input; its input range is strictly 0 V to VREF. Common-mode rejection is 70 dB at dc and 50 dB at 1 MHz, as measured per the datasheet's CMRR specification. This configuration is validated for transducer bridge measurements and noise-rejecting sensor interfaces.

Can the ADS7279IPWRG4 operate with separate analog and digital supply voltages?

Yes, the ADS7279IPWRG4 uses two independent supplies: +VA (2.7 V to 5.5 V) powers the analog core and reference circuitry, while +VBD (1.65 V to 5.5 V) powers digital I/O buffers. BDGND (pin 8) and AGND (pin 5) must be kept separate on the PCB to prevent digital switching noise from modulating the analog ground reference. This dual-supply architecture is explicitly defined in the Absolute Maximum Ratings and Electrical Characteristics sections of the ADS7279IPWRG4 datasheet.

Is the ADS7279IPWRG4 pin-compatible with the ADS7280IPWRG4?

No, the ADS7279IPWRG4 is not pin-compatible with the ADS7280IPWRG4. Although both share the TSSOP-16 package, their pin functions differ significantly: ADS7279 uses pins 3 and 4 for +IN/–IN, while ADS7280 assigns pins 2 and 3 to +IN1/+IN0 and pin 4 to COM. The RESERVED pin (12) on ADS7279 has no counterpart in ADS7280's terminal mapping. These differences are documented in the "ADS7279 Terminal Functions" and "ADS7280 Terminal Functions" tables of the SBAS436A datasheet.

What power-down current does the ADS7279IPWRG4 draw in deep power-down mode?

The ADS7279IPWRG4 draws 0.004 µA to 1 µA in deep power-down mode, depending on supply voltage and temperature. At +VA = 3 V and TA = 25°C, typical current is 0.004 µA (4 nA), as specified in the Power-Supply Requirements table under "Deep power-down mode". This ultra-low state disables the internal conversion clock and all analog circuitry while retaining register settings, enabling rapid wake-up (<1 µs) upon exit - ideal for duty-cycled sensor monitoring systems.