Texas Instruments ADS8914BRGET

Overview

ADS8914BRGET from Texas Instruments is an 18-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter with integrated reference buffer and low-dropout regulator (LDO), operating from a single 3–5.5-V analog supply (RVDD) and supporting 2.5–5-V external reference input. It delivers ±0.5-LSB INL, 102.5-dB SNR, and 14-mW power consumption at full throughput, targeting high-precision data acquisition in test equipment and medical imaging systems.

For engineers reviewing the ADS8914BRGET datasheet, ADS8914BRGET pinout, ADS8914BRGET application, or ADS8914BRGET equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC performance metrics, and two rigorously cross-checked alternative parts for precision SAR ADC selection in industrial and medical signal chains.

Technical Context

The ADS8914BRGET implements a true no-latency SAR architecture with differential unipolar input range of ±VREF and supports both SPI-compatible and source-synchronous serial interfaces. Its integrated LDO enables single-supply operation while maintaining rail-to-rail analog performance, and the internal reference buffer eliminates droop during conversion cycles without requiring external buffering.

Enhanced-SPI mode operates at up to 20 MHz SCLK for 250-kSPS throughput, delivering parity-enabled 18-bit data frames with configurable quiet time and strobe output (RVS) for FPGA/DSP synchronization. The device supports extended temperature operation from –40°C to +125°C and uses a 24-pin VQFN package with exposed thermal pad.

Key Specifications

Pinout & Package

The ADS8914BRGET is housed in a 4-mm × 4-mm, 24-pin VQFN package (RGE) with exposed thermal pad connected to GND. Pin numbering follows top-view orientation with pin 1 at top-left corner adjacent to marking dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8912BRGET, the ADS8914BRGET trades 2× lower sample rate for 2-mW lower power and relaxed timing margins; versus AD7606C-18BSTZ, it offers single-channel simplicity, integrated power management, and 4-mm × 4-mm footprint-critical for space-constrained portable instrumentation.

Availability

ADS8914BRGET is available at Aetrix Electronics and suitable for test and measurement equipment, medical imaging subsystems, and industrial process control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS8914BRGET 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 family-including ADS8914BRGET-is engineered for high-speed, high-accuracy data acquisition in demanding environments, combining integrated analog front-end features with robust digital interfacing for simplified system integration.

FAQ

What is the maximum sample rate supported by the ADS8914BRGET?

The ADS8914BRGET supports a maximum sample rate of 250 kSPS with zero latency output. This fixed throughput is specified across the full operating temperature range (–40°C to +125°C) and is achieved using the enhanced-SPI interface with up to 20-MHz SCLK. At this rate, the device consumes 14 mW total power and maintains ±0.5-LSB INL and 102.5-dB SNR performance. The ADS8914BRGET does not support oversampling or decimation modes to increase effective resolution beyond its native 18-bit capability.

Does the ADS8914BRGET require an external reference voltage?

Yes, the ADS8914BRGET requires an external reference voltage applied to the REFIN pin, with a valid range of 2.5 V to 5 V. The device includes an integrated reference buffer (accessible via REFBUFOUT pins 5 and 7) that conditions this external reference for internal ADC use, eliminating droop during conversion. The REFM pin serves as a dedicated reference ground and must be routed separately from system GND to preserve PSRR. No internal reference generator is present-the ADS8914BRGET relies entirely on the external VREF source for absolute accuracy.

How does the enhanced-SPI interface of the ADS8914BRGET differ from standard SPI?

The ADS8914BRGET enhanced-SPI interface reduces required SCLK frequency by more than 2× compared to standard SPI at the same 250-kSPS throughput-operating at 20 MHz instead of ~58 MHz. It achieves this through a 4-bit parallel SDO bus (SDO-0 to SDO-3), parity-enabled data framing, and configurable quiet time between conversions. Unlike standard SPI, enhanced-SPI uses RVS as a strobe signal to align data capture in FPGA/DSP hosts, and supports both SDR and DDR modes. The ADS8914BRGET remains backward-compatible with standard SPI controllers but delivers superior timing margin and reduced EMI.

What power supply configurations are supported by the ADS8914BRGET?

The ADS8914BRGET supports dual independent supplies: RVDD (3–5.5 V) for the analog core and DVDD (1.65–5.5 V) for the digital interface. An internal LDO generates 2.85 V for internal circuitry from RVDD, accessible at DECAP pins (13 and 14), which require a 1-µF ceramic capacitor. The device does not support single-supply operation from DVDD alone-RVDD must be present and within specification. Power-down modes (PD_ADC, PD_REFBUF) allow quiescent current reduction to as low as 40 µA, but full functionality requires both supplies active and within recommended ranges.

Can the ADS8914BRGET operate over the full industrial temperature range?

Yes, the ADS8914BRGET is fully specified and tested for operation from –40°C to +125°C ambient temperature. All key parameters-including INL (±0.5 LSB), SNR (102.5 dB), and power consumption (14 mW)-are guaranteed across this range. Thermal performance is characterized with RθJA = 31.9°C/W and RθJB = 8.9°C/W, and the exposed thermal pad must be soldered to a GND plane for reliable heat dissipation. The device meets JEDEC JESD22-A104 humidity testing and JESD22-A108 high-temperature storage requirements, making it suitable for under-hood automotive, factory-floor PLCs, and portable medical devices.