Texas Instruments ADC081S021EVAL

Overview

ADC081S021EVAL from Texas Instruments is an evaluation board for the ADC081S021, a single-channel, 8-bit successive-approximation analog-to-digital converter (SAR ADC) operating at 50–200 ksps with SPI-compatible serial interface. It supports 2.7–5.25 V supply, delivers 49.6 dB SNR (typ), and features power-down mode reducing consumption to 2.6 µW. Designed for rapid prototyping of low-power sensor signal chains in portable instrumentation.

For engineers reviewing the ADC081S021EVAL datasheet, ADC081S021EVAL pinout, ADC081S021EVAL application, or ADC081S021EVAL equivalent, this board enables functional validation of the ADC081S021's serial timing, acquisition performance, and power management across sample rates and supply voltages - critical for battery-powered data loggers and industrial remote sensing nodes.

Technical Context

The ADC081S021EVAL implements direct connection between host controller (e.g., MCU SPI port) and the ADC081S021 IC, preserving all timing-critical paths including SCLK, CS, SDATA, VIN, and VA/GND. It includes on-board decoupling (1 µF + 0.1 µF) per TI layout guidelines and exposes test points for analog input, reference, and digital signals to support jitter, noise, and THD measurements.

Board-level design follows TI's recommended practices for SAR ADC evaluation: ground plane isolation between analog and digital sections, minimal trace length for VIN and SDATA, and no onboard voltage regulation - requiring external 2.7–5.25 V supply. It does not include signal conditioning or anti-aliasing filters, placing full responsibility for front-end design on the user.

Key Specifications

Availability

ADC081S021EVAL is available at Aetrix Electronics and suitable for portable instrumentation, remote data acquisition, and industrial control system development requiring stable component supply and verified evaluation platform access.

Supply support for ADC081S021EVAL 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 leadership in data converters, power management, and interface solutions.

The ADC081S021EVAL belongs to TI's precision data converter evaluation platform family, designed specifically to accelerate hardware validation and firmware integration of low-power, high-speed SAR ADCs in resource-constrained embedded systems.

FAQ

What is the primary function of the ADC081S021EVAL?

The ADC081S021EVAL is a dedicated evaluation board for the ADC081S021 8-bit SAR ADC. It provides a validated hardware interface to assess the device's serial communication timing, analog input behavior, power consumption in normal/shutdown modes, and dynamic performance (SNR, THD) under real-world conditions. It does not add signal conditioning or processing - its purpose is faithful reproduction of the ADC081S021's native electrical interface.

Does ADC081S021EVAL include a voltage regulator or level shifter?

No. The ADC081S021EVAL requires an external 2.7–5.25 V DC supply connected via screw terminal or test point. It contains no onboard voltage regulator, LDO, or logic-level translator. Digital I/O (CS, SCLK, SDATA) operates at the same voltage as VA, matching the ADC081S021's native interface requirements per TI SNAS308G specifications.

Can ADC081S021EVAL be used to measure THD or SFDR?

Yes - but only with proper external test setup. The board provides direct access to VIN, SDATA, SCLK, and CS via test points, enabling connection to precision signal generators and spectrum analyzers. However, ADC081S021EVAL itself includes no anti-aliasing filter, clock jitter reduction circuitry, or calibrated reference; THD/SFDR results depend entirely on the quality of external stimulus and measurement equipment per TI's typical characterization conditions (fIN = 100 kHz, CL = 15 pF).

What are the key layout features of ADC081S021EVAL that align with TI's recommendations?

The ADC081S021EVAL implements TI's SNAS308G layout guidance: separate analog/digital ground planes joined at a single point near the ADC081S021 GND pin; 1 µF + 0.1 µF decoupling capacitors placed within 1 cm of VA; short, direct traces for VIN and SDATA; and exposed copper pour for thermal dissipation. No vias are placed under the ADC081S021 WSON or SOT-23 footprint to preserve thermal and electrical integrity.

Is ADC081S021EVAL compatible with both WSON and SOT-23 package variants of the ADC081S021?

Yes. The ADC081S021EVAL board includes dual footprints supporting both the 6-pin WSON (NGF) and 6-pin SOT-23 (DBV) packages of the ADC081S021, as specified in TI's SNAS308G datasheet. Pin mapping (VA, GND, VIN, SCLK, SDATA, CS) is identical across both packages, ensuring electrical and functional equivalence during evaluation regardless of chosen package variant.