Texas Instruments ADS1254EVM

Overview

ADS1254EVM from Texas Instruments is an evaluation module for the ADS1254 24-bit delta-sigma analog-to-digital converter, designed to accelerate development of high-precision measurement systems. It supports up to 20.8kHz data rate, delivers 19-bit effective resolution (1.8ppm rms noise), features four differential input channels, external reference support (0.5V–5V), and low-power operation (4.3mW at 20kHz). The EVM enables rapid prototyping in cardiac diagnostics, chromatography, and industrial process control applications.

For engineers reviewing the ADS1254EVM datasheet, ADS1254EVM pinout, ADS1254EVM application, or ADS1254EVM equivalent, this page provides verified technical context, key specifications, availability details, manufacturer background, and targeted FAQs - all focused on validating system integration, signal chain accuracy, isolation compatibility, and evaluation board interoperability with host microcontrollers.

Technical Context

The ADS1254EVM implements the ADS1254 IC in an SSOP-20 package with full access to its 4-channel differential analog inputs (CH1± through CH4±), dual power domains (AVDD = 5V, DVDD = 1.8–3.6V), and synchronous two-wire serial interface (SCLK/DOUT-DRDY). It exposes all control pins including CHSEL0/CHSEL1 for channel selection and supports both sync mode and power-down mode via SCLK manipulation.

The EVM includes onboard clock generation, buffered reference circuitry (LM4040-4.1 + OPA350), decoupling, and test points aligned to TI's SBAS213B datasheet timing and layout guidelines. It is not a standalone IC but a functional hardware platform enabling characterization of the ADS1254's sinc5 digital filter response, 60Hz/50Hz notch rejection, and multiplexed settling behavior across temperature and VREF conditions.

Key Specifications

Availability

ADS1254EVM is available at Aetrix Electronics and suitable for precision instrumentation, medical sensor interface, and industrial data acquisition requiring stable component supply, full documentation access, and TI-validated reference design fidelity.

Supply support for ADS1254EVM 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, embedded processing, and high-performance signal chain solutions, with over 50 years of innovation in precision data conversion.

The ADS1254EVM belongs to TI's Precision Data Converters product line, engineered specifically to accelerate evaluation and system-level validation of high-resolution delta-sigma ADCs in demanding measurement applications where noise, linearity, and power efficiency are critical.

FAQ

What is the primary function of the ADS1254EVM?

The ADS1254EVM is an evaluation module designed exclusively to demonstrate and validate the performance of the ADS1254 24-bit delta-sigma analog-to-digital converter. It provides complete hardware access to all ADS1254 pins, onboard clocking and reference circuitry, and documented test points aligned to TI's SBAS213B datasheet. The ADS1254EVM does not contain additional processing or wireless functionality - its sole purpose is accurate, repeatable characterization of the ADS1254's dynamic range, noise floor, INL, and multiplexed channel settling under real-world conditions.

Does the ADS1254EVM include firmware or software drivers?

No, the ADS1254EVM is a hardware-only evaluation platform with no onboard microcontroller, firmware, or preloaded drivers. Users must provide an external host (e.g., MSP430, C2000, or PC-based USB interface) to generate CLK and SCLK signals, read DOUT/DRDY status, and capture 24-bit serial output. TI provides example code and GUI software (e.g., TIDA-00145 reference design resources) separately - the ADS1254EVM itself contains only passive components, the ADS1254 IC, and supporting analog circuitry as specified in the official evaluation module user's guide.

Can the ADS1254EVM operate with a 3.3V digital supply instead of 1.8V?

Yes, the ADS1254EVM supports DVDD from 1.8V to 3.6V per the ADS1254 datasheet specifications. When using 3.3V for DVDD, ensure the SCLK and DOUT/DRDY logic levels remain within VIH/VIL thresholds (VIH ≥ 0.65 × DVDD, VIL ≤ 0.35 × DVDD), and verify that the host controller's I/O voltage matches. The ADS1254EVM's onboard jumpers and schematics accommodate both 1.8V and 3.3V digital domains without modification - this flexibility allows direct interfacing with common microcontrollers while maintaining full 19-bit effective resolution at 20 kHz.

How does the ADS1254EVM support 50Hz/60Hz notch rejection?

The ADS1254EVM enables precise 50Hz or 60Hz line-frequency rejection by allowing users to configure the ADS1254's data output rate (DOR) via the system clock (CLK). As documented in SBAS213B Table II, setting CLK to 19.2 MHz yields 50 Hz DOR, and 23.04 MHz yields 60 Hz DOR - each placing a deep digital filter notch exactly at the target frequency. The ADS1254EVM's accessible CLK input and test points let engineers verify notch depth (>100 dB), passband flatness, and step-response settling - critical for blood analysis, pyrometry, and smart transmitter designs where AC interference must be suppressed without analog filtering.

Is the ADS1254EVM compatible with isolated data acquisition systems?

Yes, the ADS1254EVM is explicitly optimized for isolated implementations. Its two-wire serial interface (SCLK and DOUT/DRDY) minimizes isolation channel count, and the separation of AVDD and DVDD rails allows independent grounding - essential for galvanic isolation. TI's reference design guidance (e.g., TIPD178) confirms the ADS1254EVM can be paired with digital isolators (e.g., ISO7741) or optocouplers on SCLK/DOUT-DRDY lines while keeping CLK local to the analog side. This architecture preserves the ADS1254EVM's 1.8 ppm noise performance and avoids ground-loop-induced errors in portable instrumentation or industrial field transmitters.