Texas Instruments ADS5423 EVM, ADS5424 EVM, ADS5433 EVM, ADS5411 EVM manual Overview, Purpose

Chapter 1

SLWU020B – February 2005 – Revised February 2006

Overview

This User’s Guide document gives a general overview of the ADS5423/24/33 and ADS5411 evaluation module (EVM) and provides a general description of the features and functions to be considered while using this module.

1.1Purpose

The EVM provides a platform for evaluating the ADS5423/24/33 14-bit analog-to-digital converter (ADC) under various signals, references, and supply conditions. This evaluation module also allows the evaluation of the ADS5411, an 11-bit analog-to-digital converter. This document should be used in combination with the EVM schematic diagram supplied.

1.2EVM Basic Functions

Analog input to the ADC is provided via external SMA connectors. The single-ended input the user provides is converted into a differential signal at the input of the device. One input path uses a differential amplifier, while the other input is transformer coupled.

The EVM provides an external SMA connector for input of the ADC clock. The single-ended input the user provides is converted into a differential signal at the input of the device.

Digital output from the EVM is via a 40-pin connector. The digital outputs from the ADC are buffered before going to the connector.

Power connections to the EVM are via banana jack sockets. Separate sockets are provided for the ADC analog and digital supplies, the external buffer supply, and the differential amplifier supply.

1.3Power Requirements

The EVM can be powered directly with only two supplies: a 3.3-V supply for the ADC digital driver supply and external buffer supply, and 5 V for the ADC analog supply if using the EVM with transformer coupled analog inputs. If using the differential amplifier analog inputs, ±5 V is required. Provision has also been made to allow the EVM to be powered with independent 3.3-V supplies to provide higher performance.

1.3.1 Voltage Limits

Exceeding the maximum input voltages can damage EVM components. Under voltage may cause improper operation of some or all of the EVM components.

1.4EVM Operational Procedure

The EVM provides a flexible means of evaluating the ADS5423/24/33 or ADS5411 in a number of modes of operation. A basic setup procedure that can be used as a board confidence check is as follows:

1. Verify all jumper settings against the schematic jumper list in Table 1-1.

SLWU020B –February 2005 –Revised February 2006 Overview 5

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