Texas Instruments ADS8902BRGER

Overview

ADS8902BRGER 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 differential input acquisition across ±VREF (2.5 V to 5 V). It delivers 104.5 dB SNR and –125 dB THD at 2 kHz, operates from –40°C to +125°C, and uses a 4 mm × 4 mm VQFN-24 package for test and measurement instrumentation.

For engineers reviewing the ADS8902BRGER datasheet, ADS8902BRGER pinout, ADS8902BRGER application, or ADS8902BRGER equivalent, this page provides verified technical context, real-world timing and accuracy specifications, validated pin functions, confirmed alternative options for high-speed precision ADC selection, and supply-chain support details specific to industrial and medical data acquisition systems.

Technical Context

The ADS8902BRGER implements a charge-redistribution SAR architecture with internal clocking, enabling zero-latency output and burst-mode acquisition. Its integrated reference buffer eliminates droop during conversion cycles, while the on-chip LDO permits single-supply operation from RVDD (3–5.5 V) without external regulation.

It supports both standard and enhanced-SPI interfaces-achieving full throughput at 22 MHz SCLK (vs. 70 MHz for legacy SPI)-and includes configurable parity bits for host-side data validation. The device features four digital outputs (SDO-0 to SDO-3), RVS status signaling, and asynchronous reset with 100 ns minimum pulse width.

Key Specifications

Pinout & Package

ADS8902BRGER is housed in a 4 mm × 4 mm, 24-pin VQFN package (RGE) with exposed thermal pad connected to GND. Pin functions are validated per TI SBAS728B Rev. May 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8900BRGER and ADS8904BRGER, the ADS8902BRGER offers optimal balance of speed (500 kSPS), power (16–20 mW), and thermal performance in the ADS890xB family-making it ideal for mid-bandwidth industrial DAQ where 1 MSPS is excessive but 250 kSPS is insufficient.

Availability

ADS8902BRGER is available at Aetrix Electronics and suitable for test and measurement instrumentation, medical imaging subsystems, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS8902BRGER 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 ADS890xB family-including ADS8902BRGER-is engineered for high-speed, high-accuracy data acquisition in thermally demanding environments, targeting applications where traditional sigma-delta or pipeline ADCs fail to meet simultaneous resolution, speed, and power targets.

FAQ

What is the maximum sample rate supported by the ADS8902BRGER?

The ADS8902BRGER supports a fixed maximum sample rate of 500 kSPS. This is a family-defined specification-not user-configurable-and corresponds to a 2 µs conversion cycle time. At this rate, the device achieves its specified AC performance (104.5 dB SNR, –125 dB THD) and DC accuracy (±1 ppm INL) across the full –40°C to +125°C temperature range. Exceeding 500 kSPS is not supported and may result in data corruption or timing violations.

Does the ADS8902BRGER require an external reference voltage?

No-the ADS8902BRGER does not require an external reference voltage, but it supports one. It includes an integrated reference buffer that can operate with either an internal or external reference. When using the internal reference, the device relies on the REFIN pin supplied with 2.5 V to 5 V; no separate reference IC is needed. The buffer eliminates droop during burst-mode acquisition, making external references optional rather than mandatory for most precision applications.

What package type and pin count does the ADS8902BRGER use?

The ADS8902BRGER uses a 4 mm × 4 mm, 24-pin VQFN package (TI package code RGE) with an exposed thermal pad. It has 24 functional pins including AINP/AINM, REFIN/REFM, REFBUFOUT (dual-pin), CS/SCLK/SDI/SDO-0–3, RST/CONVST, RVDD/DVDD/GND/DECAP. Pin functions are fully documented in Table 4-1 of the SBAS728B datasheet, and the thermal pad must be soldered to a GND plane for proper thermal and electrical performance.

Can the ADS8902BRGER interface directly with an FPGA using SPI?

Yes-the ADS8902BRGER supports direct FPGA interfacing via its enhanced-SPI interface, which is backward-compatible with standard SPI. At 500 kSPS, it requires only a 22 MHz SCLK (not 70 MHz), reducing FPGA pin loading and PCB routing complexity. The device provides RVS status strobe and four SDO lines (SDO-0 to SDO-3) for parallel data capture, enabling deterministic timing alignment critical for multi-channel FPGA-based DAQ systems.

What is the purpose of the DECAP pins on the ADS8902BRGER?

The DECAP pins (13 and 14) connect to the internal LDO's output and require a 1 µF ceramic capacitor to ground for stability. This capacitor filters LDO ripple and ensures clean analog supply for the SAR core and reference buffer. TI specifies CLDO = 1 µF in Section 5.5; using values outside 0.47–2.2 µF may cause instability or increased noise. These pins are not general-purpose decoupling nodes-they serve exclusively the on-chip LDO.