Texas Instruments ADS8028IRTJT

Overview

ADS8028IRTJT from Texas Instruments is a 12-bit successive-approximation register (SAR) analog-to-digital converter with 8 single-ended analog inputs, integrated 2.5-V internal reference, and on-die 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 telemetry.

For engineers reviewing the ADS8028IRTJT datasheet, ADS8028IRTJT pinout, ADS8028IRTJT application, or ADS8028IRTJT equivalent, key selection considerations include its QFN-20 package with exposed thermal pad, SPI-compatible 20-MHz serial interface, internal nine-channel multiplexer (8 analog + temp), and dual power-down modes supporting battery-powered and thermally constrained designs.

Technical Context

The ADS8028IRTJT implements a SAR architecture with inherent sample-and-hold, supporting one-cycle latency for deterministic timing. Its internal nine-channel multiplexer enables sequential scanning of AIN0–AIN7 or the temperature sensor without host intervention, controlled via SPI-configurable control register bits (TSENSE, TMP_AVG, EXT_REF).

It operates across AVDD = 2.7–5.25 V and DVDD = 1.65–5.25 V, with digital I/O compatible down to 1.65 V. The internal reference delivers 2.5 V ±0.3% at +25°C, 12 ppm/°C drift, and 60 µV_RMS noise over 10 MHz bandwidth-enabling stable conversions without external reference circuitry in cost-sensitive applications.

Key Specifications

Pinout & Package

The ADS8028IRTJT is housed in a 4-mm × 4-mm, 20-pin thin QFN (RTJ) package with an exposed thermal pad that must be soldered to PCB ground for thermal integrity and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8028IRTJT, ADS8038IRTJT trades power efficiency for speed, while ADS7953SRHBT expands channel count and intelligence at the cost of thermal integration and reference simplicity-making ADS8028IRTJT optimal for compact, self-contained 8-channel sensing with thermal awareness.

Availability

ADS8028IRTJT is available at Aetrix Electronics and suitable for industrial process controls, programmable logic controllers, and power-supply monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8028IRTJT 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 ADS8028IRTJT belongs to TI's high-performance SAR ADC product line, designed specifically for demanding industrial measurement applications where integration, accuracy, and thermal awareness are critical.

FAQ

What is the maximum sampling rate supported by the ADS8028IRTJT?

The ADS8028IRTJT supports a maximum throughput rate of 1 million samples per second (1 MSPS) when operating with SCLK = 20 MHz. This is achieved with a 700-ns conversion time for analog input channels and full 12-bit resolution. At this rate, the device consumes 17 mW total power with AVDD = DVDD = 3.6 V, making it suitable for real-time industrial monitoring without excessive thermal load. The ADS8028IRTJT maintains specified INL and SNR performance up to this maximum rate.

Does the ADS8028IRTJT require an external reference voltage?

No, the ADS8028IRTJT does not require an external reference voltage because it integrates a precision 2.5-V internal reference with ±0.3% initial accuracy at +25°C, 12 ppm/°C temperature coefficient, and 60 µV_RMS noise. The REF pin provides this reference for use by the ADC core. An external reference may be used instead by setting the EXT_REF bit in the control register, but the internal reference is enabled by default at power-up and eliminates the need for external components in most applications. The ADS8028IRTJT remains fully functional with only the internal reference active.

How is the internal temperature sensor used in the ADS8028IRTJT?

The internal temperature sensor in the ADS8028IRTJT measures the die temperature with 0.25°C resolution and ±1°C accuracy over –40°C to +125°C. It is selected by setting the TSENSE bit in the control register, which causes TM_BUSY to go high for 100 µs during conversion. Output data are in 12-bit two's complement format, directly convertible to degrees Celsius using documented equations. The ADS8028IRTJT also supports rolling average filtering (via TMP_AVG bit) to improve measurement stability. No external components are required-the sensor is fully integrated and calibrated.

What power-saving modes does the ADS8028IRTJT support?

The ADS8028IRTJT supports three distinct low-power states: normal mode (6.3 mA at 3.6 V), standby mode (2.5 mA), and power-down mode (10 µA). Power-down is entered via the PD/RST pin or software command and reduces current draw by >99% compared to active operation. Standby mode retains register settings and reference bias while halving supply current. All modes retain full functionality upon exit, with power-up times of 1 µs (standby) or 6 ms (power-down). These modes make the ADS8028IRTJT suitable for battery-powered and energy-conscious industrial devices.

What package type and thermal requirements apply to the ADS8028IRTJT?

The ADS8028IRTJT uses a 4-mm × 4-mm, 20-pin thin QFN (RTJ) package with an exposed thermal pad on the underside. This pad must be soldered to a PCB ground plane to ensure proper thermal dissipation (θ_JA = 32.8°C/W) and electrical stability. TI specifies that failure to connect the thermal pad may result in degraded performance or reliability. The package supports reflow soldering per JEDEC J-STD-020, and the pad's connection is mandatory-not optional-for compliance with datasheet specifications. The ADS8028IRTJT's thermal design is validated only with this mechanical implementation.