Texas Instruments ADS1252EVM

Overview

ADS1252EVM from Texas Instruments is an evaluation module for the ADS1252 - a 24-bit, delta-sigma analog-to-digital converter with 19-bit effective resolution at up to 40kHz data rate, ±0.0015% INL, 2.5ppm rms noise, and differential input architecture - designed for precision measurement in cardiac diagnostics, chromatography, and industrial process control.

For engineers reviewing the ADS1252EVM datasheet, ADS1252EVM pinout, ADS1252EVM application, or ADS1252EVM equivalent, this module enables rapid validation of the ADS1252U's high-resolution performance, synchronous serial interface timing, reference voltage flexibility (0.5V–5V), power-down/sync modes, and noise-sensitive layout practices under real-world signal conditions.

Technical Context

The ADS1252EVM implements the ADS1252U IC in an SO-8 package, supporting its full 24-bit no-missing-codes operation, fourth-order delta-sigma modulator, and sinc5 digital filter with notch rejection configurable via system clock (e.g., 19.2kHz CLK → 50Hz data rate). It provides buffered reference circuitry, isolated serial interface signals (SCLK, DOUT/DRDY), and direct access to all analog inputs (+VIN/–VIN), VREF, and power pins.

Designed for low-noise evaluation, the board incorporates 0.1µF/10µF decoupling on VDD, ground plane partitioning between analog and digital sections, and layout features that preserve the ADS1252U's 100dB CMRR and 80dB PSRR - critical for validating performance at ≤2.5ppm rms noise and <±200ppm offset error over –40°C to +85°C.

Key Specifications

Availability

ADS1252EVM is available at Aetrix Electronics and suitable for precision instrumentation development, medical device prototyping, and industrial sensor interface design requiring stable component supply and verified reference design implementation.

Supply support for ADS1252EVM 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 acquisition and signal chain solutions.

The ADS1252EVM belongs to TI's precision ADC evaluation platform family, engineered to accelerate validation of high-resolution delta-sigma converters in noise-critical applications such as clinical diagnostics and analytical instrumentation.

FAQ

What is the primary function of the ADS1252EVM?

The ADS1252EVM is an evaluation module designed exclusively to demonstrate and validate the performance of the ADS1252U 24-bit delta-sigma ADC. It provides a fully assembled, tested PCB with proper decoupling, reference buffering, and signal routing to enable engineers to measure key parameters - including 2.5ppm rms noise, ±0.0015% INL, and 40kHz data rate - without custom layout effort. The ADS1252EVM does not contain additional processing or microcontroller functionality.

Does the ADS1252EVM include the ADS1252U IC in SO-8 package?

Yes, the ADS1252EVM integrates one ADS1252U IC in an SO-8 package, mounted with appropriate thermal and grounding provisions. Pin connections match the ADS1252U datasheet: +VIN (Pin 1), –VIN (Pin 2), +VDD (Pin 3), CLK (Pin 4), DOUT/DRDY (Pin 5), SCLK (Pin 6), GND (Pin 7), and VREF (Pin 8). All pins are accessible via test points or headers for probing and interfacing.

Can the ADS1252EVM support external reference voltages other than 4.096V?

Yes, the ADS1252EVM supports external reference voltages from 0.5V to 5V applied directly to the VREF test point, bypassing the onboard LM4040-4.1/OPA350 reference circuit. When using an external reference, users must ensure current capability ≥220µA at 16MHz CLK and maintain low-noise routing - the board's VREF net is routed with controlled impedance and dedicated ground return to preserve ADS1252U's 1ppm/V gain sensitivity.

How does the ADS1252EVM implement power-down and synchronization modes?

The ADS1252EVM exposes the SCLK line to enable both power-down and synchronization functions of the ADS1252U. Holding SCLK HIGH for ≥20 DOUT/DRDY cycles enters power-down mode (reducing current to 1–10µA); holding HIGH for 4–20 cycles initiates sync mode to align multiple ADS1252U devices. These functions are verified using the onboard LED indicators and timing test points aligned with ADS1252U specification Table II timing parameters.

Is the ADS1252EVM compatible with isolated microcontroller interfaces?

Yes, the ADS1252EVM is explicitly designed for low-cost isolation: only two digital signals - SCLK and DOUT/DRDY - require isolation, while CLK can remain local to the ADS1252U side. The board provides separate ground planes and isolation-ready signal routing, enabling straightforward integration with digital isolators (e.g., ISO7721) to validate ADS1252U performance in high-common-mode-voltage environments without compromising 24-bit integrity.