User's Guide

SBAU142B–April 2009– Revised May 2011

ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and

ADS1248EVM-PDK

ADS1248EVM (Left) and ADS1248EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the ADS1148EVM and

ADS1248EVM, both by themselves and as part of the ADS1148EVM-PDK or ADS1248EVM-PDK. These

evaluation modules (EVMs) are evaluation boards for the ADS1248, a 24-bit, multi-channel, delta-sigma

analog-to-digital converter (ADC), and the ADS1148, a 16-bit version of the ADS1248. This EVM allows

evaluation of all aspects of the ADS1148 or ADS1248 devices. Complete circuit descriptions, schematic

diagrams, and bills of material are included in this document.

The following related documents are available for download through the Texas Instruments web site at

http://www.ti.com.

EVM-Compatible Device Data Sheets

Device Literature Number

ADS1148 SBAS453

ADS1248 SBAS426A

REF5020 SBOS410D

OPA227 SBOS110A

TPS3836L30 SLVS292D

TPS79225 SLVS337B

TPS72325 SLVS346B

SN74LVC2G157 SCES207K

PCA9535 SCPS129I

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SBAU142B–April 2009–Revised May 2011 ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK

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Contents

1 EVM Overview ............................................................................................................... 3

2 Analog Interface ............................................................................................................. 3

3 Digital Interface .............................................................................................................. 4

4 Power Supplies .............................................................................................................. 5

5 Voltage Reference .......................................................................................................... 6

6 Clock Source ................................................................................................................ 6

7 EVM Operation .............................................................................................................. 7

8 ADS1248EVM-PDK Kit Operation ........................................................................................ 8

9 Evaluating Performance with the ADCPro Software .................................................................. 17

10 Schematics and Layout ................................................................................................... 29

List of Figures

1 Reference Select Switch S1............................................................................................... 6

2 Jumper J2.................................................................................................................... 7

3 ADS1248EVM Default Jumper Locations................................................................................ 8

4 Virtual COM Port Installer.................................................................................................. 9

5 Virtual COM Port Setup .................................................................................................... 9

6 MMB3 Switch Locations .................................................................................................. 10

7 Connecting ADS1248EVM to MMB3 ................................................................................... 11

8 MMB3 Block Diagram..................................................................................................... 12

9 ADCPro Software Start-up Display Window ........................................................................... 13

10 ADS1248EVM-PDK Plug-In Display Window.......................................................................... 14

11 Connection Timeout....................................................................................................... 15

12 Firmware Download Message Box...................................................................................... 15

13 Firmware Download Progress Indicator ................................................................................ 16

14 Firmware Download Complete Message Box ......................................................................... 17

15 ADS1248 Multiplexer...................................................................................................... 18

16 I/O Config Tab ............................................................................................................. 19

17 Enabling VBIAS on a Channel........................................................................................... 20

18 GPIO Tab................................................................................................................... 21

19 GPIO Set to Output Mode................................................................................................ 22

20 GPIO Output Set to High ................................................................................................. 23

21 Power & Ref Tab .......................................................................................................... 24

22 Cal Tab ..................................................................................................................... 26

23 About Tab .................................................................................................................. 27

24 Progress Bar While Collecting Data .................................................................................... 28

List of Tables

1 J8/J4: Analog Interface Pinout ............................................................................................ 4

2 J7: Serial Interface Pins.................................................................................................... 4

3 J11 Configuration: Power-Supply Input .................................................................................. 5

4 J10 Configuration: Power Options ........................................................................................ 5

5 REF1 Reference Voltage Options ........................................................................................ 6

6 List of Switches.............................................................................................................. 8

7 ADS1148EVM/ADS1248EVM Bill of Materials ....................................................................... 29

ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK SBAU142B– April 2009–Revised May 2011

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EVM Overview

1 EVM Overview

1.1 Features

ADS1148EVM/ADS1248EVM Features:

• Contains all support circuitry needed for the ADS1148/ADS1248

• ±2.5V and +5V power-supply options for ADC

• Voltage reference options: external or onboard

• GPIO access

• Compatible with the TI Modular EVM System

ADS1148EVM-PDK/ADS1248EVM-PDK Features:

• Easy-to-use evaluation software for Microsoft

Windows

• Data collection to text files

• Built-in analysis tools including scope, FFT, and histogram displays

• Complete control of board settings

• Easily expandable with new analysis plug-in tools from Texas Instruments

For use with a computer, the ADS1148EVM-PDK or ADS1248EVM-PDK is available. This kit combines

the ADS1148/ADS1248EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™

software for evaluation.

The MMB3 motherboard allows the ADS1148/ADS1248EVM to be connected to the computer via an

available USB port. This manual shows how to use the MMB3 as part of the

ADS1148EVM-PDK/ADS1248EVM-PDK, but does not provide technical details about the MMB3 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based

on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.

The ADS1148EVM-PDK/ADS1248EVM-PDK is controlled by a plug-in that runs in ADCPro. For more

information about ADCPro, see the ADCPro™ Analog-to-Digital Converter Evaluation Software User's

Guide (literature number SBAU128), available for download from the TI web site.

This manual covers the operation of both the ADS1148/ADS1248EVM and the

ADS1148EVM-PDK/ADS1248EVM-PDK. Throughout this document, the abbreviation EVM and the term

evaluation module are synonymous with the ADS1148/ADS1248EVM. For clarity of reading, the remainder

of this manual will refer only to the ADS1248EVM or ADS1248EVM-PDK, but operation of the EVM and kit

for the ADS1148 is identical, unless otherwise noted.

1.2 Introduction

The ADS1248EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any modular EVM system interface card.

The ADS1248EVM is available as a stand-alone printed circuit board (PCB) or as part of the

ADS1248EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the

ADS1248EVM is useful for prototyping designs and firmware.

Note that the ADS1248EVM has no microprocessor and cannot run software. To connect it to a computer,

some type of interface is required.

2 Analog Interface

For maximum flexibility, the ADS1248EVM 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 J8. This header/socket provides access to the analog input pins of

the ADS1248. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options. These signals can also be connected to the terminal block J4.

SBAU142B– April 2009–Revised May 2011 ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK

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Part #	ERJ-3EKF2001V
Description	RES THKFLM 0603 2K OHM 1% 1/10W 100PPM/ C SMD - Cut TR (SO
Category	RESISTOR
Availability	Out of Stock
Qty	0

ERJ-3EKF2001V

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