Texas Instruments SLAU039 User manual

Evaluation Board for the
TLC320AD50C DSP Analog
Interface Circuit
2000 Mixed Signal Products
User’s Guide
SLAU039

IMPORTANT NOTICE
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to verify, before placing orders, that information being relied on is current and complete. All products are sold
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TIdeemsnecessarytosupport thiswarranty.Specific testingofallparametersofeachdeviceis notnecessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICALAPPLICATIONS.INCLUSIONOFTIPRODUCTSINSUCHAPPLICATIONSISUNDERSTOODTO
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In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 2000, Texas Instruments Incorporated

Notational Conventions
iii
Read This First
Preface
Read This First
About This Manual
This user’s guide discusses the design, use, and performance of the
TLC320AD50 Evaluation Module.
How to Use This Manual
This document contains the following chapters:
- Chapter 1 – Introduction
- Chapter 2 – AD50-EVM Design and Construction
- Chapter 3 – Setting Up the AD50-EVM
- Chapter 4 – Results Obtained With AD50 EVM
- Appendix A –Installing the AD50-EVM
- Appendix B –Programmable Logic
- Appendix C –Converting DSK+ Software for the AD50-EVM
Notational Conventions
This document uses the following conventions.
- Program listings, program examples, and interactive displays are shown
in a special typeface similar to a typewriter’s. Examples use a bold
version of the special typeface for emphasis; interactive displays use a
bold version ofthe special typeface to distinguish commands that you
enter from items that the system displays (such as prompts, command
output, error messages, etc.).
Here is a sample program listing:
0011 0005 0001 .field 1, 2
0012 0005 0003 .field 3, 4
0013 0005 0006 .field 6, 3
0014 0006 .even

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Here is an example of a system prompt and a command that you might
enter:
C: csr –a /user/ti/simuboard/utilities
- In syntax descriptions, the instruction, command, or directive is in a bold
typefacefontandparametersareinan italictypeface .Portionsofasyntax
that are in bold should be entered as shown; portions of a syntax that are
in
italics describe the type of information that should be entered. Here is
an example of a directive syntax:
.asect ” section name ”, address
.asectisthedirective.Thisdirectivehastwoparameters,indicatedby sec-
tionname
and address .Whenyou use .asect, thefirstparameter must be
anactualsectionname,enclosedindoublequotes;thesecondparameter
must be an address.
- Square brackets ( [and ]) identify an optional parameter. If you use an
optional parameter, you specify the information within the brackets; you
don’t enter the brackets themselves. Here’s an example of an instruction
that has an optional parameter:
LALK 16–bit constant [, shift]
TheLALKinstruction hastwoparameters.Thefirstparameter, 16-bitcon-
stant , is required. The second parameter, shift , is optional. As this syntax
shows,ifyou usetheoptionalsecondparameter, youmustprecedeitwith
a comma.
Square brackets are also used as part of the pathname specification for
VMS pathnames; in this case, the brackets are actually part of the path-
name (they are not optional).
- Braces( {and} )indicatealist.Thesymbol|(readas or )separatesitems
within the list. Here’s an example of a list:
{ * | *+ | *– }
This provides three choices: *, *+, or *–.
Unless the list is enclosed in square brackets, you must choose one item
from the list.
- Some directives can have a varying number of parameters. For example,
the .byte directive can have up to 100 parameters. The syntax for this di-
rective is:
.byte
value
1
[, ... , value
n
]
This syntax shows that .byte must have at least one value parameter, but
you have the option of supplying additional value parameters, separated
by commas.

Related Documentation From Texas Instruments
v
Read This First
Related Documentation From Texas Instruments
TLC320AD50C Data Manual, Literature number SLAS131
Data Acquisition Data Book, Literature number SLAD001
Data Converter Selection Guide, Literature number SLABE05
Operational Amplifiers Data Book Volume A, Literature number SLYD011
Operational Amplifiers Data Book Volume B, Literature number SLYD012
Rail-to-Rail Operational Amplifier Selection Guide,
Literature number SLOBE02
Single Supply Operational Amplifier Selection Guide,
Literature number SLOBE03
Mixed Signal Analog CD-ROM, Literature number SLYC005
TMS320C54x CPU and Peripherals, Literature number SPRU131
TMS320C54x Algebraic Instruction Set, Literature number SPRU179
TMS320C54x DSKplus User’s Guide, Literature number SPRU191
Much useful software is available from the TI Internet site. The main TI Web
site is at
http://www.ti.com/
Information on the DSK+ is at
http://www.ti.com/sc/docs/dsps/tools/c54x/c54xdskp.htm
DSK+ software can be downloaded from
http://www.ti.com/sc/docs/dsps/tools/c54x/softsupp.htm

vi

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Chapter Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Scope of User’s Guide 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Block Diagram of AD50-EVM 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Special Considerations When Using Sigma-Delta Converters 1-4. . . . . . . . . . . . . . . . . . . . .
1.3.1 Advantages 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.2 Disadvantages 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 AD50-EVM Design and Construction 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 PCB Construction 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Power Supply 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 System Clock 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Reset 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Serial Port Interfacing 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Analog Input 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.1 Preamp Design 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.2 Input Stage Design 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.3 Op Amp Selection 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.4 Antialiasing Filter 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Analog Output 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Setting Up the AD50-EVM 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Setting Up the AD50-EVM With the DSK+ 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Setting Up the AD50-EVM in Stand-Alone Mode 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Configuring the Serial Interface 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Programming the AD50 Registers 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 Sine-Wave Generator and Loopback Program 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Results Obtained With AD50 EVM 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 ADC Results 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 DAC Results 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Installing the AD50-EVM A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1 Board Outline Drawing With Jumper Locations on the AD50 EVM A-2. . . . . . . . . . . . . . . . .
A.2 Connecting the AD50-EVM to the DSK+ A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.3 Parts List A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.4 Circuit Diagrams A-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.5 PCB Diagrams A-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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B Programmable Logic B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.1 DSK+ Mode B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2 Stand-Alone Mode B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.3 Logic Compiler Listing B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Converting DSK+ Software for the AD50-EVM C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Contents
Figures
1–1 AD50-EVM Block Diagram 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 AD50-EVM Input Stage 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 AD50-EVM Antialiasing Filter Options 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 AD50-EVM Differential to Single-Ended Output Converter 2-9. . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 AD50-EVM ADC Distortion Measurement at 8 ksps 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 AD50-EVM ADC Distortion Measurement at 20 ksps 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–3 AD50-EVM DAC Distortion Measurement at 8 ksps 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–4 AD50-EVM DAC Distortion Measurement at 20 ksps 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–1 Diagram of the AD50-EVM A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Tables
2–1 Sampling Frequencies for Various MCLK and Register 4 Values 2-4. . . . . . . . . . . . . . . . . . . . .
A–1 Jumper Positions A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–2 Control and Serial Connections A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A–3 Analog Input/Output Connectors A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1 AD50-EVM Registers B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .