Texas Instruments ADS5240EVM

Overview

ADS5240EVM from Texas Instruments is an evaluation module designed to simplify performance testing of the ADS5240/ADS5242 family of 12-bit, quad-channel analog-to-digital converters with LVDS outputs. It supports single-ended, transformer-coupled analog inputs via four SMA connectors (J2, J4, J7, J9), accepts up to 3 Vpp low-jitter clock input at J1, and routes LVDS data outputs to P6 for connection to the ADSDeSer-50EVM deserializer.

For engineers reviewing the ADS5240EVM datasheet, ADS5240EVM pinout, ADS5240EVM application, or ADS5240EVM equivalent, this module enables rapid register-level configuration, internal reference selection (int/ext), power-down control, custom pattern generation, and LSB/MSB-first data format switching - all via PC-based serial interface using the included software and DB9 connector (P5).

Technical Context

The ADS5240EVM interfaces directly with the ADS5240 ADC (64-pin QFN package) and integrates a Cypress CY8C27243-24PVXI microcontroller (U2) for register access and board control logic. It provides three independent supply rails - AVDD (3.3 V analog), DVDD (3.3 V digital), and LVDD (1.8–3.3 V LVDS driver) - configurable via ferrite beads FB1/FB2 for noise isolation.

Signal conditioning includes Mini-Circuits ADT2-1T transformers for AC-coupled input paths, MAX3221CDB RS-232 level shifter (U1) for PC communication, and MC100EPT21DT differential clock driver (U3). The board supports both internal and external reference modes, selectable via SW3 and indicated by CR4 LED.

Key Specifications

Availability

ADS5240EVM is available at Aetrix Electronics and suitable for high-speed data acquisition system validation, ADC performance benchmarking, LVDS interface prototyping, and embedded signal chain development requiring stable component supply and full evaluation support.

Supply support for ADS5240EVM 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and data converter technologies with over 50 years of innovation in precision signal chain solutions.

The ADS5240EVM belongs to TI's high-speed data converter evaluation platform family, engineered specifically to accelerate design-in and characterization of multichannel, low-power, LVDS-output ADCs for communications, medical imaging, and test equipment applications.

FAQ

What is the primary function of the ADS5240EVM?

The ADS5240EVM is a dedicated evaluation module for the ADS5240/ADS5242 12-bit, quad-channel ADCs. It provides complete hardware infrastructure - including clock conditioning, transformer-coupled analog inputs, LVDS output routing, and microcontroller-based register control - enabling engineers to validate dynamic performance, configure operating modes, and integrate the ADC into signal chain designs without custom PCB development. The ADS5240EVM simplifies early-stage testing and reduces time-to-results for high-speed data conversion applications.

Does the ADS5240EVM support external reference voltage inputs?

Yes, the ADS5240EVM supports external reference voltage inputs via terminal block P2 (REFT, GND, REFB). By asserting pushbutton SW3, the ADS5240 device switches from its internal reference to the externally supplied reference pair. This mode is confirmed in the User's Guide (SBAU116), and the Int/Ext Reference LED (CR4) illuminates when internal reference is active. The ADS5240EVM thus enables precise reference calibration and system-level accuracy validation.

How is the ADS5240EVM connected to a host PC for register control?

The ADS5240EVM connects to a host PC via a standard DB9 serial interface (P5), using the included serial cable and TI-provided Windows software. The onboard MAX3221CDB (U1) performs RS-232 level shifting, while the Cypress CY8C27243-24PVXI microcontroller (U2) handles command parsing and SPI-like register writes to the ADS5240. Users select the COM port during startup, then use the graphical Register Access Program to modify channel settings, generate test patterns, toggle power-down, and reset the device - all without modifying hardware.

Can the ADS5240EVM operate without the ADSDeSer-50EVM?

Yes, the ADS5240EVM can operate independently for basic functionality - including power-up initialization, register access, reference selection, and power-down control - but LVDS data output remains serialized and requires deserialization for parallel data analysis. P6 provides the raw LVDS output stream; connecting to the ADSDeSer-50EVM is necessary only to recover parallel digital outputs and clock signals for oscilloscope capture or FPGA ingestion. The ADS5240EVM's standalone operation supports configuration and diagnostics even without deserialization hardware.

What clock signal requirements must be met for reliable ADS5240EVM operation?

The ADS5240EVM requires a clean, low-jitter 3 Vpp clock signal applied to SMA connector J1. Either sinusoidal or square-wave waveforms are accepted, and the maximum usable frequency is constrained by the ADS5240 device's specifications - not the EVM itself. The board includes no on-board clock generation; users must supply an external clock source meeting jitter and slew-rate requirements outlined in the ADS5240 datasheet. Proper termination and impedance matching are essential to maintain signal integrity across the clock path.