Texas Instruments ADS4128EVM

Overview

ADS4128EVM from Texas Instruments is an evaluation module designed to characterize the ADS4128 12-bit, 250-MSPS analog-to-digital converter (ADC) under configurable signal, clock, reference, and power supply conditions. It supports transformer-coupled single-ended analog input (J6), external or onboard CDCE72010-derived clocking (up to 245.76 MHz), dual 1.8-V analog/digital supplies (LDO or switching regulator), and LVDS digital output capture via J10.

For engineers reviewing the ADS4128EVM datasheet, ADS4128EVM pinout, ADS4128EVM application, or ADS4128EVM equivalent, this page details jumper-configurable power options (TPS79618 LDO vs. TPS62562 buck), clock routing paths (direct SMA J19 vs. VCXO+CDCE72010 filtered CMOS), analog input modes (transformer-coupled vs. THS4509-amplified), and digital interface setup for HSDC Pro/TSW1400 data capture.

Technical Context

The ADS4128EVM implements a modular, jumper-driven architecture to isolate and validate ADC performance variables: power integrity (separate 1.8VA/1.8VD rails with selectable LDO/switching regulation), clock fidelity (three distinct clock paths-direct AC-coupled, crystal-filtered LVCMOS, or differential LVPECL), and analog signal conditioning (transformer-based passive conversion or active THS4509 amplification).

Digital interfacing uses parallel LVDS outputs routed to 20-pin Samtec QSH connector J10, requiring external 100-Ω termination per pair unless connected to TSW1400, which provides automatic termination. SPI control of the ADS4128 is supported via optional serial register programming, though default operation uses parallel mode jumpers (JP12 = 1–2) for static configuration.

Key Specifications

Availability

ADS4128EVM is available at Aetrix Electronics and suitable for high-speed data converter evaluation, RF receiver characterization, and wideband instrumentation development requiring stable component supply and full signal-chain validation capability.

Supply support for ADS4128EVM 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 converter technologies, with over 90 years of innovation in precision electronics.

The ADS41xx EVM platform was developed specifically to accelerate evaluation of TI's high-speed pipeline ADCs-including the ADS4128-across RF, communications, and test equipment applications where clock jitter, power supply noise, and analog front-end linearity critically impact SNR and SFDR.

FAQ

What is the primary function of the ADS4128EVM?

The ADS4128EVM is an evaluation module built to characterize the ADS4128 12-bit, 250-MSPS analog-to-digital converter under real-world signal, clock, power, and reference conditions. It enables engineers to validate dynamic performance metrics-including SNR, SFDR, and ENOB-using configurable analog input paths, multiple clock sources, and flexible power delivery schemes before integrating the ADS4128 into final designs.

Which ADC does the ADS4128EVM support out of the box?

The ADS4128EVM is hardware-compatible with the full ADS41xx family, but its default configuration-including jumper settings, power rail assignments, and schematic layout-is optimized for the ADS4128. The board also supports ADS4126, ADS4146, ADS4129, ADS4149, ADS41B29, ADS41B49, and ADS58B18, as confirmed in the TI user's guide SLWU067D.

How do I configure the ADS4128EVM for transformer-coupled analog input?

To configure the ADS4128EVM for transformer-coupled analog input, install surface-mount resistors R84, R94, R97, and R98; remove R82, R95, R96, R99, and R106; and leave JP7 in 2–3 position (amplifier disabled). This routes the 50-Ω single-ended signal from SMA connector J6 through two ADT4-1WT transformers to generate a differential input for the ADS4128, matching the default shipped configuration described in Table 2-6 of the ADS4128EVM user guide.

Can the ADS4128EVM generate its own clock signal?

Yes-the ADS4128EVM can generate an onboard clock using the CDCE72010 clock buffer and an optional VCXO (not populated by default). When configured with JP4 = 1–2 (VCXO enabled), R107 installed (reference clock path), and R114 installed (Y0 output routed through crystal filter), the CDCE72010 delivers a 245.76-MHz filtered LVCMOS clock to the ADS4128, derived from a 983.04-MHz VCXO divided by 4, as specified in the EEPROM configuration shown in Figure 2-4 of the ADS4128EVM user guide.

What software tools are required to capture and analyze data from the ADS4128EVM?

Data capture and analysis for the ADS4128EVM require Texas Instruments' High Speed Data Converter Pro (HSDC Pro) software paired with the TSW1400 data capture board. HSDC Pro provides FFT, histogram, and spectral analysis; supports register programming of the ADS4128; and auto-detects the ADS4128EVM when connected via USB and J10. The TSW1400 handles LVDS signal acquisition and provides on-board 100-Ω termination, eliminating need for external logic analyzers or oscilloscope probes.