Texas Instruments ADS1202 User manual

ADS1202 Modular EVM
August 2003 Data Acquisition - Digital/Analog Converters)
User’s Guide
SLAU111

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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
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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,
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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
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of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
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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
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TI assumesno 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.
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Texas Instruments
Post Office Box 655303
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Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of ±125 mV and the output
voltage range of 0 V to 5 V.
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
23°C. The EVM is designed to operate properly with certain components above 50°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 users guide describes the characteristics, operation, and use of the
ADS1202 Modular EVM. A complete circuit description as well as schematic
diagram is included.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—EVM Overview
-Chapter 2—Power Supply Options
-Chapter 3—EVM Operation
-Chapter 4—ADS1202 Modular EVM BOM and Schematic
Information About Cautions and Warnings
This book may contain cautions and warnings.
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
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
Related Documentation From Texas Instruments
To obtain a copy of any of the following TI documents, call the Texas
Instruments Literature Response Center at [phone] or the Product
Information Center (PIC) at [phone]. When ordering, please identify
this booklet by its title and literature number. Updated documents can also be
obtained through our website at www.ti.com.
Data Sheet: Literature Number:
ADS1202 SBAS275
User’s Guide: Literature Number:
5-6K Interface Board EVM SLAU104
FCC Warning
This equipment is intended for use in a laboratory test environment only. It gen-
erates, 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 en-
vironments 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 Texas Instruments.

Contents
v
Contents
1 EVM Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Digital Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Power Supply Options 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 EVM Operation 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 ADS1202 Modular EVM BOM and Schematic 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 ADS1202 Modular EVM BOM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Schematic 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
4-1. Bill of Materials 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

1-1
EVM Overview
EVM Overview
The ADS1202 modular EVM provides direct modulator output to a host
processor and allows all operating modes of the ADS1202. It provides various
isolation options for a variety of applications.
The new modular EVM form factor allows for direct evaluation of the ADC’s
performance and operating characteristics. This EVM is compatible with the
5-6K Interface Board (SLAU104) from Texas Instruments.
-Direct modulator output
-Various isolation options
-Direct operation with a variety of DSK platforms from Texas
Instruments
Topic Page
1.1 Analog Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Digital Interface 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Analog Interface
1-2
1.1 Analog Interface
The ADS1202 modular EVM is designed for easy interfacing to multiple analog
sources. Samtec part numbers SSW-110-22-F-D-VS-K and
TSM-110-01-T-DV-P provide a convenient 10-pin dual row header/socket
combination at J1. Connector J1 provides access to the ADS1202 input pins.
The modulator + input terminal is connected to pin 2, the - input terminal is
connected to pin 4. Pins 1-19 are connected to analog ground.
1.2 Digital Interface
The ADS1202 modular EVM is designed for easy interfacing to multiple control
platforms. Samtec part numbers SSW-110-22-F-D-VS-K and
TSM-110-01-T-DV-P provide a convenient 10-pin dual row header/socket
combination at J2. This header/socket combination provides access to the
clock and data output pins of the ADS1202 Sigma Delta modulator.
Signal Description
J2.1 Unused
J2.3 SCLK Serial clock input (for use with MODE 3 Operation)
J2.5 CLKR Modulator clock output (for use with MODES 0, 1 and 2)
J2.7 Unused
J2.9 Unused
J2.11 Unused
J2.13 SDO Bit stream data output from ADS1202
J2.15 Unused
J2.17 Unused
J2.19 SPARE