Texas Instruments ADS8914BRGER

Overview

ADS8914BRGER from Texas Instruments is an 18-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter with integrated reference buffer and LDO, designed for high-precision data acquisition in single-supply systems. It delivers ±0.5-LSB INL, 102.5-dB SNR, and operates from –40°C to +125°C in a 4-mm × 4-mm VQFN package.

For engineers reviewing the ADS8914BRGER datasheet, ADS8914BRGER pinout, ADS8914BRGER application, or ADS8914BRGER equivalent, key selection considerations include its enhanced-SPI interface (20-MHz SCLK at 250-kSPS), unipolar differential input range (±VREF), and low 14-mW power consumption at full throughput-critical for test equipment, medical imaging, and industrial DAQ systems requiring DC accuracy and noise immunity.

Technical Context

The ADS8914BRGER implements a SAR architecture with no latency output and uses TI's enhanced-SPI protocol to reduce required clock frequency while maintaining throughput-enabling reliable communication with FPGAs and DSPs without external timing complexity. Its integrated LDO accepts 3–5.5-V RVDD and generates stable internal supplies, eliminating need for external regulators.

It features a low-droop reference buffer supporting 2.5–5-V external references, configurable parity on SDO outputs for host-side data validation, and quiet-time acquisition control via CONVST. The device supports both SPI-compatible and source-synchronous serial interfaces, with RVS serving as a programmable status strobe synchronized to conversion completion.

Key Specifications

Pinout & Package

ADS8914BRGER is housed in a 24-pin VQFN (RGE) package with 4-mm × 4-mm footprint and exposed thermal pad connected to GND. Pin functions are validated per TI SBAS707B Rev B datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8912BRGER and ADS8902BRGER, the ADS8914BRGER provides optimal balance of resolution, power efficiency, and thermal performance for 250-kSPS industrial DAQ-offering lowest power among 18-bit variants while retaining full feature compatibility and pin alignment within the ADS891xB family.

Availability

ADS8914BRGER is available at Aetrix Electronics and suitable for test and measurement equipment, medical imaging subsystems, and industrial process control DAQ requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS8914BRGER 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 ADS891xB product line was developed to address high-speed, high-accuracy data acquisition needs in harsh environments-delivering integrated reference buffering, low-power operation, and robust digital interfaces for next-generation test, medical, and industrial systems.

FAQ

What is the maximum sample rate supported by the ADS8914BRGER?

The ADS8914BRGER supports a maximum sample rate of 250 kSPS, with a corresponding ADC cycle time of 4 µs. This throughput is achieved using the enhanced-SPI interface at up to 20 MHz SCLK, and the device maintains full 18-bit performance-including ±0.5-LSB INL and 102.5-dB SNR-at this rate. The ADS8914BRGER is optimized for applications where precision and power efficiency are prioritized over raw speed, distinguishing it from faster variants like the ADS8912BRGER (500 kSPS) in the same family.

Does the ADS8914BRGER require an external reference voltage?

Yes, the ADS8914BRGER requires an external reference voltage applied to the REFIN pin, within the 2.5-V to 5-V range. It integrates a high-performance reference buffer (REFBUFOUT) that accepts this external reference and conditions it for internal use-eliminating the need for an external op-amp buffer but not the reference source itself. The device does not include an internal voltage reference; REFIN must be supplied by a stable, low-noise source, and REFM must be connected to analog ground for proper operation.

How does the enhanced-SPI interface of the ADS8914BRGER differ from standard SPI?

The enhanced-SPI interface of the ADS8914BRGER reduces required SCLK frequency by more than 3× compared to standard SPI at the same throughput-enabling 250-kSPS operation with only a 20-MHz clock instead of ~70 MHz. It supports configurable parity bits on SDO outputs for data integrity verification and offers flexible framing options including source-synchronous modes using the RVS strobe. Unlike standard SPI, it also allows simultaneous multi-bit data reads (via SDO-0 to SDO-3) and integrates protocol-level timing control to simplify host synchronization.

What package type and thermal characteristics does the ADS8914BRGER have?

The ADS8914BRGER is packaged in a 24-pin VQFN (RGE) with a 4-mm × 4-mm body and 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. The thermal pad must be soldered to a solid GND plane for optimal performance and reliability. This compact, thermally enhanced package supports high-density layouts in space-constrained applications such as portable test instruments and modular DAQ systems.

Can the ADS8914BRGER operate from a single supply rail?

Yes, the ADS8914BRGER supports true single-supply operation via its integrated low-dropout regulator (LDO), which generates internal analog supplies from a single 3–5.5-V RVDD input. The LDO output is accessible at the DECAP pins and requires only a 1-µF ceramic capacitor. DVDD may be supplied separately (1.65–5.5 V) or tied to RVDD, allowing either fully integrated or split-rail configurations. This eliminates external regulators and simplifies power architecture in battery-powered or isolated systems.