Texas Instruments ADS8331EVM

Overview

ADS8331EVM from Texas Instruments is an evaluation module designed exclusively for the ADS8331 - a 16-bit, 4-channel, 500-kSPS successive approximation register (SAR) analog-to-digital converter in a 24-pin VQFN package. It provides full hardware support including onboard REF5040 voltage reference, OPA211 input buffer, OPA350 reference buffer, and configurable SPI/I²C interfaces for ADC control and data capture.

For engineers reviewing the ADS8331EVM datasheet, ADS8331EVM pinout, ADS8331EVM application, or ADS8331EVM equivalent, this module enables rapid validation of high-precision data acquisition systems requiring 16-bit resolution, ±10V analog signal conditioning, and flexible clocking via internal oscillator or external SCLK.

Technical Context

The ADS8331EVM implements a modular interface architecture compliant with TI's Modular EVM System specification, enabling direct connection to compatible interface cards like the HPA-MCU or 5-6K Interface EVMs. It supports both ADS8331 (4-channel) and ADS8332 (8-channel) devices via shared board layout and jumper-configurable signal routing.

All analog inputs (IN0–IN3 for ADS8331) are routed directly to J1 header pins without filtering by default, while optional first-order RC filters and unity-gain OPA211 buffering can be enabled via JP3. Digital control uses standard SPI signals (CS/FS, SCLK, DIN, DOUT) plus I²C (SCL/SDA) for EEPROM configuration and CONVST/RESET for timing-critical sampling control.

Key Specifications

Availability

ADS8331EVM is available at Aetrix Electronics and suitable for precision test equipment, industrial data loggers, and medical instrumentation requiring stable component supply, traceable sourcing, and long-term evaluation platform continuity.

Supply support for ADS8331EVM 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 company specializing in analog and embedded processing technologies, with over 90 years of innovation in precision signal chain solutions.

The ADS8331EVM belongs to TI's precision data acquisition evaluation platform family, engineered to accelerate development of high-resolution, low-noise measurement systems using SAR ADCs in industrial, test & measurement, and medical applications.

FAQ

What is the primary purpose of the ADS8331EVM?

The ADS8331EVM is an evaluation module built specifically to characterize and validate the performance of the ADS8331 16-bit, 4-channel SAR ADC. It provides all necessary support circuitry-including REF5040 reference, OPA211 input buffer, and configurable power/signal routing-enabling engineers to evaluate DC accuracy, AC performance, and system-level integration without custom PCB design. The ADS8331EVM does not include a microprocessor and requires external host interface for data capture.

Which ADC devices does the ADS8331EVM support?

The ADS8331EVM supports both the ADS8331 (4-channel) and ADS8332 (8-channel) 16-bit SAR ADCs in identical 24-VQFN packages. Hardware compatibility is maintained through shared layout, jumper-selectable configurations (e.g., JP3 for input buffering, JP4 for CS routing), and dual-row headers (J1, J2, J3) that expose all critical analog/digital signals. The ADS8331EVM user guide explicitly states it is "an evaluation board for the ADS8331 and the ADS8332" and includes schematics for both variants.

How is the reference voltage configured on the ADS8331EVM?

The ADS8331EVM uses the onboard REF5040 (4.096 V precision reference) by default, selected via JP6 (1–2 position). The reference signal can be routed either directly to the ADS8331 REF+ pin or buffered through the OPA350 op amp-controlled by jumpers JP5 (signal path) and JP12 (output connection). Both JP5 and JP12 must be installed to enable buffering; removing JP12 and moving JP5 to 2–3 bypasses the op amp. This configuration ensures low-noise, high-stability reference drive per ADS8331 requirements.

What power supplies are required to operate the ADS8331EVM?

The ADS8331EVM requires ±10 V to ±15 V analog supplies (+VA/–VA) for the OPA211 input buffer and REF5040, +5VD or +3.3VD digital supply (selected via JP7), +5VA analog supply, and separate AGND/DGND connections. The +VA supply powers the REF5040 and TL750L05 LDO, which generates +5V for the ADS8331 VBD and OPA350. These multi-rail requirements ensure full 0 V to 4.096 V common-mode input range and prevent damage during power sequencing.

Can the ADS8331EVM be used standalone without external hardware?

No-the ADS8331EVM has no onboard microcontroller or firmware and cannot operate autonomously. It requires external hardware to generate SPI clock (SCLK), chip select (CS/FS), conversion start (CONVST), and reset (/RESET) signals, as well as to capture serial data (DOUT). Compatible interface options include TI's HPA-MCU or 5-6K Interface EVMs, or custom FPGA/microcontroller platforms connected via J1 (analog), J2 (digital), and J3 (power) headers.