Texas Instruments ADS8922BRGER

Overview

ADS8922BRGER from Texas Instruments is a 16-bit, 500-kSPS successive approximation register (SAR) analog-to-digital converter with integrated reference buffer and LDO, differential unipolar input range of ±VREF, SNR of 96.8 dB, and INL of ±0.25 LSB - deployed in high-precision data acquisition systems requiring low-latency, single-supply operation.

For engineers reviewing the ADS8922BRGER datasheet, ADS8922BRGER pinout, ADS8922BRGER application, or ADS8922BRGER equivalent, this page delivers verified electrical specifications, validated 24-pin VQFN package mapping, confirmed Enhanced-SPI interface behavior at 18-MHz SCLK, and real-world use context for test equipment and medical imaging signal chains.

Technical Context

The ADS8922BRGER implements a SAR architecture with no latency output and internal reference buffering that eliminates droop during conversion cycles. Its integrated LDO accepts 3–5.5 V RVDD and generates stable analog supply rails, enabling true single-supply system design without external regulators.

It supports both standard SPI and TI's Enhanced-SPI mode (with configurable parity), achieving full 16-bit throughput at 18-MHz SCLK - significantly lower than conventional 52-MHz requirements for comparable 16-bit SAR ADCs. The device operates across –40°C to +125°C with guaranteed 16-bit no-missing-codes performance.

Key Specifications

Pinout & Package

ADS8922BRGER is housed in a 4-mm × 4-mm, 24-pin VQFN package (RGE) with exposed thermal pad connected to GND. Pin count, layout, and thermal metrics (RθJA = 31.9°C/W) are identical across the ADS892xB family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8920BRGER and ADS8924BRGER, the ADS8922BRGER delivers optimal balance of speed (500 kSPS), power (20 mW), and thermal robustness (–40°C to +125°C), making it the preferred choice for mid-tier industrial and medical signal acquisition where latency, linearity, and supply simplicity are jointly critical.

Availability

ADS8922BRGER is available at Aetrix Electronics and suitable for test and measurement equipment, medical imaging front-ends, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8922BRGER 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 signal chain solutions.

The ADS892xB family was designed specifically for high-accuracy, high-speed data acquisition systems needing integrated reference buffering, single-supply operation, and deterministic low-latency conversion - targeting test equipment, medical diagnostics, and industrial automation.

FAQ

What is the maximum sample rate supported by the ADS8922BRGER?

The ADS8922BRGER supports a fixed maximum sample rate of 500 kSPS. This is a family-defined specification - not user-configurable - and is guaranteed across the full operating temperature range (–40°C to +125°C) with all AC and DC performance parameters met. The ADS8922BRGER achieves this rate using an internal timing architecture that requires no external clock divider or configuration registers.

Does the ADS8922BRGER require an external reference voltage source?

Yes, the ADS8922BRGER requires an external reference voltage applied to the REFIN pin within 2.5 V to 5 V. While it includes an integrated reference buffer and LDO, it does not contain an internal voltage reference. The reference buffer conditions the external reference to drive the ADC core with zero droop, but the precision and stability of the overall system depend on the quality of the external reference supplied to REFIN.

How does the Enhanced-SPI interface of the ADS8922BRGER differ from standard SPI?

The ADS8922BRGER Enhanced-SPI interface uses a 4-bit parallel SDO bus (SDO-0 through SDO-3) and supports configurable parity bits per frame - unlike standard SPI's single SDO line. This architecture enables full 16-bit data transfer at 18-MHz SCLK instead of the 52-MHz clock required for equivalent throughput in standard SPI, reducing EMI and simplifying PCB layout while adding host-side data integrity checking.

What power supply configurations are supported by the ADS8922BRGER?

The ADS8922BRGER supports independent analog (RVDD) and digital (DVDD) supplies: RVDD ranges from 3 V to 5.5 V and powers the ADC core and reference buffer; DVDD ranges from 1.65 V to 5.5 V and powers the SPI interface. Its integrated LDO eliminates the need for a separate analog rail regulator, but both supplies must be independently decoupled - RVDD with 1 µF at DECAP pins, DVDD with local 100-nF ceramic.

Is the ADS8922BRGER pin-compatible with other devices in the ADS892xB family?

Yes, the ADS8922BRGER is fully pin-to-pin compatible with ADS8920BRGER and ADS8924BRGER in the same RGE (24-pin VQFN) package. All share identical pin functions, thermal pad connection, and PCB footprint. This allows direct substitution between 1-MSPS, 500-kSPS, and 250-kSPS variants without layout changes - only firmware timing adjustments may be needed to match the target sample rate.