Texas Instruments ADS5411 User Manual
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ADS5423/24/33 and ADS5411 EVM

User Guide

User's Guide

February 2006

SLWU020B

2

SLWU020B –February2005–RevisedFebruary 2006

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Contents

1

Overview ...................................................................................................................

5

 

1.1

Purpose ..............................................................................................................

5

 

1.2

EVM Basic Functions...............................................................................................

5

 

1.3

Power Requirements ...............................................................................................

5

 

 

1.3.1 Voltage Limits ..............................................................................................

5

 

1.4

EVM Operational Procedure ......................................................................................

5

2

Circuit Description .....................................................................................................

7

 

2.1

Schematic Diagram.................................................................................................

7

 

2.2

Circuit Function .....................................................................................................

7

 

 

2.2.1

Analog Inputs ..............................................................................................

7

 

 

2.2.2

Power ........................................................................................................

7

 

 

2.2.3

Outputs ......................................................................................................

7

3

Parts List

..................................................................................................................

9

4

Physical Description .................................................................................................

11

 

4.1

PCB ........................................................................................................Layout

11

 

4.2

Schematics .........................................................................................................

17

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Contents

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List of Figures

4-1

Top Layer....................................................................................................................

11

4-2

Layer 2, Ground Plane ....................................................................................................

12

4-3

Layer 3, Power Plane #1 ..................................................................................................

13

4-4

Layer 4, Power Plane #2 ..................................................................................................

14

4-5

Layer 5, Ground Plane ....................................................................................................

15

4-6

Layer 6, Bottom Layer ....................................................................................................

16

 

 

List of Tables

1-1

Three Pin Jumper List Table

............................................................................................... 6

2-1

Output Connector J9 ........................................................................................................

8

2-2

Test Point Description.......................................................................................................

8

3-1

Bill of Materials for EVM ....................................................................................................

9

4

List of Figures

SLWU020B –February2005–RevisedFebruary 2006

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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-bitanalog-to-digitalconverter (ADC) under various signals, references, and supply conditions. This evaluation module also allows the evaluation of the ADS5411, an11-bitanalog-to-digitalconverter. 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-endedinput 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-endedinput the user provides is converted into a differential signal at the input of the device.

Digital output from the EVM is via a 40-pinconnector. 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-Vsupply 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 independent3.3-Vsupplies 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 –February2005–RevisedFebruary 2006

Overview

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EVM Operational Procedure

Table 1-1.Three Pin Jumper List Table

JUMPER

FUNCTION

LOCATION: PINS 1–2

LOCATION: PINS 2–3

DEFAULT

SJP3

Provides AIN+ source to ADC

Source provided from T2

Source provided from Diff Amp

1–2

 

device

 

 

 

SJP4

Provides AIN– source to ADC

Source provided from Diff Amp

Source provided from T2

2-3

 

device

 

 

 

2.Connect supplies to the EVM as follows:

+5 V (4.75 V–5.25V) ADC analog supply to J3 and return to J2. +3.3 V (3V–3.6V) digital buffer supply to J4 and J1 and return to J6

3.Switch power supplies on.

4.Use a function generator with 50-Ω output to input a105-MHz,0-Voffset,1-Vrmssine-wavesignal into J5. The frequency of the clock must be within the specification for the device speed grade.

5.Supply an input signal by using a frequency generator with a 50-Ω output to provide a 15.5 MHz,0-Voffset,–1-dBFSamplitudesine-wavesignal into J11. Afull-scaleinput tone into the ADC device is a differential 2.2 Vpp and dBFS can be calculated by using the following formula:

* dBFS+ 20 log

captured max code * captured min code

 

, where N is the number of bits.

2N

 

 

6.The digital pattern on the output connector J9 should now represent a 2'scompliment sine wave and can be monitored using a logic analyzer.

6

Overview

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