Texas Instruments DAC1220EVM Manuale utente



 

August 2004

User’s Guide

SBAU102

Data Acquisition Products

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

in which TI products or services are used. Information published by TI regarding third-party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

such altered documentation.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

Following are URLs where you can obtain information on other Texas Instruments products and application

solutions:

Products Applications

Amplifiers amplifier.ti.com Audio www.ti.com/audio

Data Converters dataconverter.ti.com Automotive www.ti.com/automotive

DSP dsp.ti.com Broadband www.ti.com/broadband

Interface interface.ti.com Digital Control www.ti.com/digitalcontrol

Logic logic.ti.com Military www.ti.com/military

Power Mgmt power.ti.com Optical Networking www.ti.com/opticalnetwork

Microcontrollers microcontroller.ti.com Security www.ti.com/security

Telephony www.ti.com/telephony

Video & Imaging www.ti.com/video

Wireless www.ti.com/wireless

Mailing Address: Texas Instruments

Post Office Box 655303 Dallas, Texas 75265

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the specified input and output ranges of 0V to 5V that

are described in the EVM User’s Guide.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Contents

iii

Contents

Preface



About This Manual

This manual describes the DAC1220EVM evaluation fixture and how to use

it. Throughout this document, the abbreviation EVM and the term evaluation

module are synonymous with the DAC1220EVM.

Related Documentation From Texas Instruments

The following documents provide information regarding Texas Instruments

integrated circuits used in the assembly of the DAC1220EVM. These docu-

ments are available from the TI web site, and are current at the time of the

writing of this User’s Guide. To obtain a copy of the following TI documents,

visit our website at http://www.ti.com/ or call the Texas Instruments Litera-

ture Response Center at (800) 477−8924 or the Product Information Center

at (972) 644−5580. When ordering, identify the document by both title and

literature number.

Data sheet Literature number

DAC1220 Data Sheet SBAS273

REF1004 Data Sheet SBVS002

OPA335 Data Sheet SBOS245

OPA350 Data Sheet SBOS099

SN74LVC1G80 Data Sheet SCES221

Additional Documentation

The following document provides information regarding selected non-TI

components, which may be used in the testing of the DAC1220EVM. This

document is available from the corresponding manufacturer.

Document Manufacturer

HPA449 User’s Guide SoftBaugh, http://www.softbaugh.com

Contents

If You Need Assistance

If you have questions regarding either the use of this evaluation module or

the information contained in the accompanying documentation, please con-

tact the Texas Instruments Product Information Center at (972) 644−5580

or visit the TI web site at www.ti.com.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It

generates, uses, and can radiate radio frequency energy and has not been

tested for compliance with the limits of computing devices pursuant to sub-

part J of part 15 of FCC rules, which are designed to provide reasonable

protection against radio frequency interference. Operation of this equip-

ment in other environments may cause interference with radio communica-

tions, in which case the user at his own expense will be required to take

whatever measures may be required to correct this interference.

Trademarks

SPI is a registered trademark of Motorola, Inc.

I2C is a registered trademark of Royal Philips Electronics B.V., The Nether-

lands.

All other trademarks are the property of their respective owners.

Contents



1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Built-In Accessories 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Connectors 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Controls 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Setting Up 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Circuit Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 DAC1220 and Ancillary Components 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.1 Filter Capacitors 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1.2 Power 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Clock Oscillator 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Voltage Reference 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Output Buffer Amplifier 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Layout 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Usage 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 I/O Connectors and Testpoints 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.1 J1: Analog Connector 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.2 J2: Serial Connector 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.3 J4: Power Connector 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1.4 Testpoints 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Jumpers 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.1 J3: DAC1220 Supply Current Measurement Jumpers 3-6. . . . . . . . . . . . . . . . . . . . . . .

3.2.2 J5: DAC1220 Analog-Digital Ground Shorting Jumpers 3-6. . . . . . . . . . . . . . . . . . . . .

3.3 Switches 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.1 S1: Reference Input Select 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3.2 S2: System Clock Select 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Schematic and Layout 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Schematic 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Board Layout 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Bill of Materials 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents



3−1. DAC1220EVM Connectors and Testpoints 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−2. Analog Connector Pinout for the DAC1220EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−3. Serial Connector Pinout for the DAC1220EVM 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−4. Power Connector Pinout for the DAC1220EVM 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−5. DAC1220EVM Jumpers 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−6. Jumper Block J3 on the DAC1220EVM 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−7. DAC1220EVM Switches 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−1. DAC1220EVM Schematic 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−2. DAC1220EVM—Layer 1 (Top) 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−3. DAC1220EVM—Layer 2 (Bottom) 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



3−1. Analog Connector Pin Descriptions for the DAC1220EVM 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−2. Serial Connector Pin Descriptions for the DAC1220EVM 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−3. Power Connector Pin Descriptions for the DAC1220EVM 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4−1. Bill of Materials 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Overview



The DAC1220EVM is an evaluation fixture designed for the DAC1220 20-bit

delta-sigma (∆Σ) digital-to-analog data converter. The EVM is designed for

prototyping and evaluation, and includes a reference circuit, an oscillator circuit,

and an output buffer amplifier. Use of the output buffer amplifier is optional.

Topic Page

1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Built-In Accessories 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Connectors 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Controls 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Setting Up 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Introduction

1-2

1.1 Introduction

Many data converter evaluation fixtures contain a computer interface or a

microcontroller, but the DAC1220EVM contains only the DAC1220 device and

a few supporting components. All DAC1220 pins are accessible through

various pins on the analog and digital connectors of the DAC1220EVM.

The DAC1220EVM is designed using a simple card format developed by TI.

This simple, consistent design makes the DAC1220EVM very easy to connect

to your own prototype system. One can even think of the DAC1220EVM as an

alternate package for the DAC1220—one much larger than the device itself,

but also much easier to wire up by hand on a test bench.

The DAC1220EVM can be plugged directly into suitable motherboards, such

as the HPA449 MSP430 microcontroller development system from Soft-

Baugh, Inc. (http://www.softbaugh.com). See also TI’s web site for example

code using the DAC1220EVM with the HPA449.

The DAC1220EVM, together with the HPA449 and the appropriate software,

also forms a complete evaluation system for verifying the DAC1220 perfor-

mance. See the Texas Instruments web site for additional information and soft-

ware.

1.2 Built-In Accessories

The DAC1220EVM includes a system clock generator and a low-noise voltage

reference. Using either of these components is optional; you can select an ex-

ternal system clock and/or an external reference, using the slide switches on

the EVM.

The +2.5V reference circuit is based on a REF1004-2.5 voltage reference. Its

noise performance is sufficient to allow the DAC1220 to perform at its lowest

noise level.

The on-board clock circuit uses a 2.4576MHz crystal. A switch selects be-

tween the crystal and an external clock signal applied to the TOUT pin of the

serial connector, J2.

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