Texas Instruments ADS8902BRGET

Overview

ADS8902BRGET from Texas Instruments is a 20-bit, 500-kSPS successive-approximation-register (SAR) analog-to-digital converter with integrated reference buffer and low-dropout regulator (LDO), designed for high-precision data acquisition in space-constrained systems. It delivers ±1 ppm INL, ±0.2 ppm DNL, 104.5 dB SNR, and –125 dB THD across –40°C to +125°C, supporting unipolar differential input ranges up to ±5 V in test and measurement instrumentation.

For engineers reviewing the ADS8902BRGET datasheet, ADS8902BRGET pinout, ADS8902BRGET application, or ADS8902BRGET equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and timing behavior at 500 kSPS, and real-world implementation guidance for FPGA- and MCU-based high-speed acquisition systems.

Technical Context

The ADS8902BRGET implements a charge-redistribution SAR architecture with internal clocking, enabling deterministic, zero-latency conversion output. Its integrated reference buffer eliminates external op-amp droop during burst-mode sampling, while the on-chip LDO allows single-supply operation from RVDD (3–5.5 V) without requiring separate analog/digital rails.

It supports both standard and enhanced multiSPI™ interfaces-achieving full 20-bit throughput at only 22 MHz SCLK (vs. 70 MHz for legacy SPI)-and includes configurable parity bits for host-side ADC data validation. The device enters acquisition phase automatically after conversion completion, with 300 ns minimum acquisition time and 2 ps RMS aperture jitter.

Key Specifications

Pinout & Package

ADS8902BRGET is housed in a 24-pin VQFN package (RGE) with 0.5-mm pitch and exposed thermal pad. The thermal pad must be soldered to a GND plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8912BRGET and AD7616BSTZ, the ADS8902BRGET uniquely combines 20-bit resolution, integrated reference buffer/LDO, and 4 mm × 4 mm footprint-making it optimal for single-channel, ultra-high-accuracy, space-constrained designs where external component count and thermal management are critical.

Availability

ADS8902BRGET is available at Aetrix Electronics and suitable for test and measurement instrumentation, medical imaging subsystems, and high-precision industrial data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADS8902BRGET 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 ADS890xB family was developed to address demand for single-chip, high-resolution SAR ADCs in compact, thermally constrained systems-emphasizing integration (LDO + reference buffer), low-power operation, and simplified digital interfacing for FPGA and MCU platforms.

FAQ

What is the maximum sample rate of the ADS8902BRGET?

The ADS8902BRGET has a fixed maximum sample rate of 500 kSPS. This is a variant-specific specification within the ADS890xB family (ADS8900B = 1 MSPS, ADS8902B = 500 kSPS, ADS8904B = 250 kSPS). Conversion time is 1.1–1.2 µs, and the device guarantees zero-latency output with deterministic timing for real-time control loops.

Does the ADS8902BRGET require an external reference voltage?

No-the ADS8902BRGET can operate with either an external reference applied to REFIN (2.5 V to 5 V) or its internal reference buffer configured as the source. The integrated reference buffer eliminates droop during burst acquisition and supports margining (±4.5 mV), making external reference ICs optional in most implementations of ADS8902BRGET.

What package type and pin count does the ADS8902BRGET use?

The ADS8902BRGET uses a 24-pin VQFN package (RGE) measuring 4 mm × 4 mm with 0.5-mm pitch and an exposed thermal pad. Pin functions-including dual SDO outputs, CONVST, CS, and decoupled DECAP terminals-are fully documented in TI's SBAS728B datasheet and validated for this exact part number.

How does the enhanced multiSPI™ interface of the ADS8902BRGET differ from standard SPI?

The ADS8902BRGET's enhanced multiSPI™ interface reduces required SCLK frequency to 22 MHz at 500 kSPS (vs. 70 MHz for standard SPI), simplifies timing closure, and adds configurable parity bits to each 20-bit conversion word. It remains backward-compatible with standard SPI controllers but enables higher throughput at lower clock speeds-critical for FPGA and low-power MCU designs using ADS8902BRGET.

What is the operating temperature range for the ADS8902BRGET?

The ADS8902BRGET is specified for continuous operation from –40°C to +125°C ambient temperature. All key parameters-including ±1 ppm INL, ±0.2 ppm DNL, 104.5 dB SNR, and 16–20 mW power dissipation-are guaranteed across this full industrial/automotive range, as verified in TI's SBAS728B production data.