Texas Instruments ADS8028IRTJR

Overview

ADS8028IRTJR from Texas Instruments is a 12-bit successive-approximation register (SAR) analog-to-digital converter with 8 single-ended analog inputs, internal 2.5-V reference, and integrated temperature sensor offering 0.25°C resolution. It achieves 1 MSPS throughput, ±0.5 LSB INL, and 72 dB SNR at 50 kHz, enabling high-accuracy sensor monitoring in industrial PLCs and power-supply systems.

For engineers reviewing the ADS8028IRTJR datasheet, ADS8028IRTJR pinout, ADS8028IRTJR application, or ADS8028IRTJR equivalent, key selection criteria include its SPI-compatible 20-MHz interface, dual supply operation (AVDD: 2.7–5.25 V, DVDD: 1.65–5.25 V), internal temperature sensing capability, and QFN-20 package with exposed thermal pad for thermal management in compact embedded designs.

Technical Context

The ADS8028IRTJR implements a SAR architecture with inherent sample-and-hold, supporting sequential scanning of eight analog channels plus the internal temperature sensor via a nine-channel multiplexer. Its control logic enables indefinite auto-sequencing without host intervention after initial configuration.

It features two distinct conversion paths: standard analog input channels (AIN0–AIN7) outputting straight-binary 12-bit codes, and the temperature sensor channel outputting twos-complement 12-bit data with fixed 0.25°C LSB. The TM_BUSY pin provides hardware timing indication specifically for temperature conversions (max 100 µs).

Key Specifications

Pinout & Package

The ADS8028IRTJR is housed in a 4-mm × 4-mm thin QFN-20 package with an exposed thermal pad that must be soldered to PCB ground for thermal dissipation and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8028IRTJR, ADS8038IRTJR offers higher resolution at the cost of increased power and reduced temperature sensor integration, while ADS7953SRHBT trades built-in reference and thermal sensing for greater channel count and design flexibility in reference-sourced systems.

Availability

ADS8028IRTJR is available at Aetrix Electronics and suitable for programmable logic controls, industrial process controls, and power-supply monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8028IRTJR 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 ICs.

The ADS8028IRTJR belongs to TI's high-performance SAR ADC product line, designed specifically for demanding industrial measurement applications requiring integrated functionality, wide supply tolerance, and extended temperature operation (–40°C to +125°C).

FAQ

What is the maximum sampling rate supported by the ADS8028IRTJR?

The ADS8028IRTJR supports a maximum throughput rate of 1 MSPS under specified conditions (fSCLK = 20 MHz, AVDD/DVDD ≥ 3.0 V). At this rate, conversion time is 700 ns for analog channels and 100 µs for the internal temperature sensor channel. Performance remains stable across the full industrial temperature range of –40°C to +125°C.

Does the ADS8028IRTJR require an external reference voltage?

No, the ADS8028IRTJR does not require an external reference voltage because it integrates a precision 2.5-V internal reference with ±0.3% initial accuracy and 12 ppm/°C temperature coefficient. The REF pin provides this reference output, and a 10-µF decoupling capacitor is recommended between REF and AGND. An external reference can be used optionally by setting the EXT_REF bit.

How is the internal temperature sensor accessed and what is its accuracy?

The internal temperature sensor in the ADS8028IRTJR is selected by setting the TSENSE bit in the control register. It provides 0.25°C resolution and ±1°C accuracy over the full operating range (–40°C to +125°C). The TM_BUSY pin asserts high during conversion (max 100 µs), and output data are in twos-complement format for direct temperature calculation per the datasheet equations.

What power-saving modes does the ADS8028IRTJR support?

The ADS8028IRTJR supports three low-power states: STANDBY mode (1.5–2.5 mA), power-down mode (1–10 µA), and normal operational mode (4.1–7.5 mA depending on supply voltage). Power-down is entered via the PD/RST pin or software command, and wake-up time is 6 ms with internal reference enabled. These modes allow dynamic power scaling in battery-powered or thermally constrained systems.

Is the ADS8028IRTJR pin-compatible with other devices in the ADS80xx family?

Yes, the ADS8028IRTJR shares the same QFN-20 (RTJ) package and pinout with ADS8038IRTJR and ADS8048IRTJR, differing only in resolution (12-bit vs. 14-bit vs. 16-bit) and associated performance parameters. This enables drop-in upgrades in existing designs where higher resolution is later required without PCB redesign.