Texas Instruments DAC8574 User manual

DAC8574 Evaluation Module
June 2003 Data Acquisition - Digital/Analog Converters
User’s Guide
SLAU109

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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

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
Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input and output voltage ranges 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.
During normal operation, some circuit components may have case temperatures greater than
60°C. The EVM is designed to operate properly with certain components above 60°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

Information About Cautions and Warnings
iii
Preface
Read This First
About This Manual
This user’s guide describes the characteristics, operation, and the use of the
DAC8574 evaluation module. It covers all pertinent areas involved to properly
use this EVM board along with the devices that it supports. The physical PCB
layout, schematic diagram and circuit descriptions are included.
How to Use This Manual
This document contains the following chapters:
Chapter 1 —EVM Overview
Chapter 2—PCB Design and Performance
Chapter 3—EVM Operation
Information About Cautions and Warnings
This book may contain cautions and warnings.
The information in a caution or a warning is provided for your protection. Read
each caution and warning carefully.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.

Trademarks
iv
Related Documentation From Texas Instruments
To obtain a copy of any of the following TI documents, call the Texas
Instruments Literature Response Center (PIC) at [phone] or the
Product Information Center (PIC) at [phone]. When ordering, identify
this manual by its title and literature number. Updated documents can also be
obtained through our website at www.ti.com.
Data Sheets: Literature Number:
DAC8574 SLAS377A
REF02 SBVS-003A
OPA627 PDS-998H
OPA2132 PDS-1309B
Questions about this or other Data Converter EVM’s?
If you have questions about this or other Texas Instruments Data Converter
evaluation modules, feel free to e-mail the Data Converter Application Team
at [email protected]. Inlcude in the subject heading the product you
have questions or concerns with.
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 subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Trademarks
TI Logo is a trademark of Texdas Instruments Incorporated.
I2C is a trademark of Phillips Corporation.

Contents
v
Contents
1 EVM Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.1 Supply Voltage 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.2 Reference Voltage 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 EVM Basic Functions 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 PCB Design and Performance 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 EVM Performance 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Bill of Materials 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Factory Default Setting 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Host Processor Interface 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 EVM Stacking 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 The Output Op-Amp 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 Unity Gain Output 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 Output Gain of Two 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3 Capacitive Load Drive 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 Optional Signal Conditioning Op-Amp (U8B) 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 Jumper Setting 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 Schematic 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi
Figures
1-1 EVM Block Diagram 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Top Silkscreen 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Layer 1 (Top Signal Plane) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Layer 2 (Ground Plane) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Layer 3 (Power Plane) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Layer 4 (Bottom Signal Plane) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 Bottom Silkscreen 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7 Drill Drawing 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8 DAC8574 EVM Test Parameters and Results 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9 INL and DNL Characterization Graph of DAC A 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10 INL and DNL Characterization Graph of DAC B 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11 INL and DNL Characterization Graph of DAC C 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-12 INL and DNL Characterization Graph of DAC D 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2-1 Parts List 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Factory Default Jumper Setting 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 DAC Output Channel Mapping 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Unity Gain Output Jumper Settings 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Gain of Two Output Jumper Settings 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Capacitive Load Drive Output Jumper Settings 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Jumper Setting Functions 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
EVM Overview
EVM Overview
This chapter gives a general overview of the DAC8574 evaluation module
(EVM), and describes some of the factors that must be considered in using this
module.
Topic Page
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 EVM Basic Functions 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Features
1-2
1.1 Features
This EVM features the DAC8574 digital-to-analog converter (DAC). The
DAC8574 EVM is a simple evaluation module designed for a quick and easy
way to evaluate the functionality and performance of the high resolution,
quad-channel, and serial I2Cinput DAC. This EVM features a serial I2C
interface to communicate with any host microprocessor or TI DSP base
system.
1.2 Power Requirements
The following sections describe the power requirements of this EVM.
1.2.1 Supply Voltage
The dc power supply requirement for the digital section (VDD) of this EVM is
typically 5 V connected to the J5-1 or via J6-10 terminal (when plugged in with
another EVM board or interface card) and is referenced to ground through the
J5-2 and J6-5 terminal. The dc power supply requirements for the analog
section of this EVM are as follows; the VCC and VSS ranges from 15.75 V to
-15.75 V maximum and connects through J1-3 and J1-1 respectively, or
through J6-1 and J6-2 terminals. The 5 VA connects through J5-3 or J6-3
and the 3.3 VA connects through J6-8. All of the analog power supplies are
referenced to analog ground through J1-2 and J6-6 terminals.
The device under test, U1, analog power supply can be powered by either 5 VA
or 3.3 VA by selecting the proper position of jumper W1. This allows the
DAC8574 analog section to operate in either supply power while the I/O and
digital section is powered by 5 V, VDD.
The VCC supply source is mainly used to provide the positive rail of the external
output op-amp, U2, the reference chip, U3 and the reference buffer, U8. The
negative rail of the output op-amp, U2, can be selected between VSS and
AGND via W5 jumper. The external op-amp is installed as an option to provide
output signal conditioning or boost capacitive load drive and for other output
mode requirement desired.
Caution
To avoid potential damage to the EVM board, make sure that the
correct cables are connected to their respective terminals as
labeled on the EVM board.
Stresses above the maximum listed voltage ratings may cause
permanent damage to the device.