Texas Instruments ADS8922BRGET

Overview

ADS8922BRGET from Texas Instruments is a 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with integrated reference buffer and low-dropout regulator (LDO). It delivers ±0.25-LSB INL, 96.8-dB SNR, and –125-dB THD in a 4-mm × 4-mm VQFN package, enabling high-precision data acquisition in space-constrained industrial and medical systems.

For engineers reviewing the ADS8922BRGET datasheet, ADS8922BRGET pinout, ADS8922BRGET application, or ADS8922BRGET equivalent, this page provides verified specifications, validated pin functions, confirmed thermal performance (RθJA = 31.9°C/W), and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

The ADS8922BRGET implements a single-channel SAR architecture with internal LDO and reference buffer, supporting unipolar differential input ranges of ±VREF (2.5 V to 5 V) and operating across –40°C to +125°C. Its enhanced SPI interface enables 18-MHz SCLK at 500-kSPS with configurable parity output for host-side data validation.

Conversion timing is deterministic: 1.1–1.2 µs conversion time, 300-ns acquisition window, and quiet-time aperture control. The device supports both SPI-compatible and source-synchronous serial protocols, with RVS serving as a multifunction status/strobe output depending on CS state and protocol selection.

Key Specifications

Pinout & Package

ADS8922BRGET uses a 24-pin VQFN package (RGE) with exposed thermal pad connected to GND. Pin count, layout, and thermal metrics are identical across the ADS892xB family. Decoupling is required on DECAP (pins 13/14) and REFBUFOUT (pins 5/7), which must be shorted externally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8922BRGET, ADS8920BRGET offers 2× throughput at identical accuracy and interface, while ADS8924BRGET trades speed for 30% lower power-both maintain pin-to-pin compatibility, shared register map, and identical reference buffer/LDO architecture.

Availability

ADS8922BRGET is available at Aetrix Electronics and suitable for test and measurement equipment, medical imaging subsystems, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8922BRGET 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 ADS892xB family was engineered for high-speed, high-accuracy data acquisition in harsh environments-delivering integrated reference buffering, LDO regulation, and enhanced SPI to simplify system-level timing and power design.

FAQ

What is the maximum sample rate of the ADS8922BRGET?

The ADS8922BRGET has a fixed maximum sample rate of 500 kSPS, validated across its full operating temperature range (–40°C to +125°C) and supply conditions. This rate is determined by internal SAR timing and is not user-configurable; it corresponds to a 2-µs ADC cycle time per conversion.

Does the ADS8922BRGET require an external reference voltage?

Yes, the ADS8922BRGET requires an external reference voltage applied to the REFIN pin within 2.5 V to 5 V. Its integrated reference buffer accepts this input and provides low-droop, low-drift buffering-but does not generate the reference itself. No internal reference is present.

What package type and thermal characteristics does the ADS8922BRGET have?

The ADS8922BRGET uses a 24-pin VQFN (RGE) package measuring 4 mm × 4 mm with an exposed thermal pad. Its thermal resistance is characterized as RθJA = 31.9°C/W and RθJB = 8.9°C/W, enabling efficient heat transfer to the PCB when the thermal pad is soldered to a solid GND plane.

How does the enhanced SPI interface of the ADS8922BRGET differ from standard SPI?

The ADS8922BRGET's enhanced SPI operates at 18-MHz SCLK for 500-kSPS throughput-significantly lower than the 52-MHz clock required by standard SPI for equivalent speed. It also supports optional parity bits appended to the 16-bit data word, enabling host-side error detection without protocol overhead.

Can the ADS8922BRGET operate from a single supply rail?

Yes, the ADS8922BRGET supports single-supply operation via its integrated LDO, which generates a regulated 2.85-V supply for internal analog circuitry from the RVDD rail (3 V to 5.5 V). However, separate RVDD (analog) and DVDD (digital) supplies are still required-though both may be derived from the same source with proper decoupling.