Texas Instruments ADS5421EVM

Overview

ADS5421EVM from Texas Instruments is an evaluation module designed to accelerate prototyping and performance validation of the ADS5421 14-bit, 40-MSPS analog-to-digital converter. It provides two independent signal paths - one transformer-coupled (AC) and one differential amplifier-based (DC) - with dedicated power domains, buffered CMOS digital outputs, and configurable full-scale input ranges up to 4 V_PP.

For engineers reviewing the ADS5421EVM datasheet, ADS5421EVM pinout, ADS5421EVM application, or ADS5421EVM equivalent, this module supports rapid ADC characterization in high-speed data acquisition, communications test equipment, and instrumentation systems where signal integrity, clock jitter sensitivity, and flexible front-end coupling are critical selection criteria.

Technical Context

The ADS5421EVM implements dual front-end architectures: a 1:2 step-up transformer (T4–6T) for AC-coupled RF/IF inputs and a THS4502 differential amplifier for DC-coupled baseband signals. Each path includes matched termination, RC filtering, and independent power routing to minimize crosstalk and preserve SNR.

It integrates SN65LVDS101 clock conditioners for low-jitter differential clock distribution and SN74ALVCH16244 buffers for robust 32-bit parallel CMOS output drive. Power is segregated into +5 V analog (DUT), +3.3 V I/O (buffer & clock ICs), and ±5 V op-amp rails - all delivered via screw terminals with explicit labeling (J1/J2/J200–J202).

Key Specifications

Availability

ADS5421EVM is available at Aetrix Electronics and suitable for high-speed data acquisition systems, communications test equipment, and instrumentation design requiring stable component supply, traceable evaluation hardware, and TI-validated reference layouts.

Supply support for ADS5421EVM 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, embedded processing, and high-performance data conversion technologies, with decades of leadership in precision ADC design.

The ADS5421EVM belongs to TI's high-speed ADC evaluation platform family, engineered specifically to de-risk system-level integration of 14-bit, 40+ MSPS converters in demanding signal chain applications.

FAQ

What is the primary purpose of the ADS5421EVM?

The ADS5421EVM is a Texas Instruments evaluation module built exclusively to characterize and validate the ADS5421 14-bit, 40-MSPS analog-to-digital converter. It provides two fully assembled, independent signal paths - transformer-coupled and amplifier-based - enabling immediate lab testing without layout or component assembly. The ADS5421EVM is not a production-ready subsystem but a development tool for signal integrity analysis, timing margining, and interface verification under real operating conditions.

Does the ADS5421EVM support both AC- and DC-coupled analog inputs?

Yes, the ADS5421EVM supports both coupling methods via physically separate sections. The first uses a Mini-Circuits T4–6T transformer for AC-coupled RF/IF signals; the second employs a THS4502 differential amplifier for DC-coupled baseband inputs with 2× gain. Each path has dedicated power, grounding, and layout - no reconfiguration is needed. This dual-path architecture allows direct comparison of coupling trade-offs on the same board using the ADS5421EVM.

What power supplies are required to operate the ADS5421EVM?

The ADS5421EVM requires three distinct power domains: +5 V for the ADS5421 analog core (via J2/J201), +3.3 V for digital output buffers and clock translators (via J1/J200), and ±5 V for the THS4502 op-amp section (via J202). All are supplied through labeled screw terminals. Incorrect voltage application or reversed polarity may damage components. The ADS5421EVM User's Guide (SBAU084) specifies absolute maximum ratings and sequencing guidance for safe operation.

Can the ADS5421EVM be used with the ADS5422 ADC?

Yes - the ADS5421EVM is shared hardware for both ADS5421 and ADS5422 devices. The board accommodates either converter in its PQFP-64 socket (DUT1 or DUT200), and all signal paths, power domains, and configuration options remain valid. However, the ADS5422 supports up to 62 MSPS sampling, so clock and data capture setup must reflect that higher rate. When using the ADS5421EVM with ADS5422, ensure clock jitter and PCB trace integrity meet the tighter timing requirements of the faster device.

Is the ADS5421EVM compliant with CE, FCC, or UL standards?

No - the ADS5421EVM is explicitly designated for engineering development and evaluation only, not for commercial end products. As stated in the EVM Important Notice, it lacks full EMC shielding, safety isolation, and regulatory certification (e.g., CE, FCC, UL). Its open construction and prototype nature mean users must implement their own ESD precautions, thermal management, and compliance validation. TI does not guarantee regulatory conformance for the ADS5421EVM in final system deployments.