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User's Guide

SBAU106 – October 2004

ADS1241MEVM

This

user's

guide

describes

the

characteristics,

operation,

and

use

of

the

ADS1241MEVM. This EVM is a 24-bit analog-to-digital converter evaluation module. A
complete circuit description, schematic diagram, and bill of materials are included.

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

www.ti.com

.

EVM-Compatible Device Data Sheets

Literature

Device

Number

ADS1241

SBAS173

REF1004

SBVS002

OPA350

SBOS099

SN74LVC1G126

SCES224

Contents

1

EVM Overview

...............................................................................................................

2

2

Analog Interface

............................................................................................................

2

3

Digital Interface

.............................................................................................................

3

4

Power Supplies

.............................................................................................................

3

5

EVM Operation

..............................................................................................................

5

6

EVM Bill of Materials and Schematic

...................................................................................

7

List of Figures

1

ADS1241MEVM Switch and Jumper Locations

......................................................................

5

List of Tables

1

Analog Interface Pinout

...................................................................................................

2

2

Digital Interface Pinout

....................................................................................................

3

3

Power Supply Pinout

......................................................................................................

3

4

Reference Selection Options - S6 and S7

.............................................................................

4

5

Input Selection Options - S1 through S4

..............................................................................

5

6

AINCOM Selection Options - S5

.........................................................................................

5

7

ADS1241MEVM Bill of Materials

.........................................................................................

7

Speedy33 is a trademark of Hyperception, Inc..

1

SBAU106 – October 2004

ADS1241MEVM

Содержание ADS1241

Страница 1: ...erature Device Number ADS1241 SBAS173 REF1004 SBVS002 OPA350 SBOS099 SN74LVC1G126 SCES224 Contents 1 EVM Overview 2 2 Analog Interface 2 3 Digital Interface 3 4 Power Supplies 3 5 EVM Operation 5 6 EVM Bill of Materials and Schematic 7 List of Figures 1 ADS1241MEVM Switch and Jumper Locations 5 List of Tables 1 Analog Interface Pinout 2 2 Digital Interface Pinout 3 3 Power Supply Pinout 3 4 Refere...

Страница 2: ... hyperception com For maximum flexibility the ADS1241MEVM 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 This header socket provides access to the analog input pins of the ADS1241 Consult Samtec at www samtec com or call 1 800 SAMTEC 9 for a variety of mat...

Страница 3: ...able see Section 5 3 1 1 J2 9 Unused J2 10 DGND Digital ground J2 11 DIN Serial data input to ADS1241 from host J2 12 BUFEN Buffer enable J2 13 DOUT Serial data output from ADS1241 to host J2 14 POL Serial clock polarity J2 15 DRDY Data ready J2 16 SCL I2C bus serial clock J2 17 TOUT External clock input to ADS1241 J2 18 DGND Digital ground J2 19 RESET Resets ADS1241 device J2 20 SDA I2C bus data ...

Страница 4: ...ed to J4 10 DVDD can be applied to J4 3 referenced to J4 10 Note that this EVM uses only a single ground plane The ADS1241 requires an external voltage reference Two switches S6 and S7 select the source of the reference for the ADS1241 An external reference may be supplied through J1 pin 20 on the ADS1241MEVM A 2 5V reference is provided on the EVM for convenience or the supply voltage may also be...

Страница 5: ...g input sources can be applied directly to J1 top or bottom side or through optional amplifier and signal conditioning modules Consult the ADS1241 data sheet to determine the maximum analog input range Switches S1 S5 can be used to select the source for inputs AIN0 3 as shown in Table 5 AINCOM is selected by S5 as shown in Table 6 Table 5 Input Selection Options S1 through S4 Switch Position Input...

Страница 6: ...lock oscillator starts up and works reliably However some users may wish to try a different crystal or load capacitor values and in some cases the ADS1241 clock oscillator will take a long time to start up To help decrease startup time the circuit built around U5 is provided on the EVM This is only for experimental purposes and has not been proven nor is it recommended it is provided only as a pos...

Страница 7: ...X5R0J475M Chip Capacitor 20 X5R C17 22µF 16V Ceramic TDK C3225X5R1C226M Chip Capacitor 20 X5R C1 C3 C4 C6 C7 C8 C9 Ceramic Chip Capacitor Not C10 C11 C12 Installed X1 4 9152MHz Crystal Thru hole CTS ATS042 U1 Analog to Digital Converter Texas Instruments ADS1241E U2 Op Amp Texas Instruments OPA350UA U3 2 5V Reference Texas Instruments REF1004I 2 5 U4 256K I2C EEPROM MicroChip 24LC256 I SN U5 Tri S...

Страница 8: ... 8 A2 3 U4 MCP_24LC256 I SN X1 4 9152MHz C20 18P C21 12P DVDD SDA SCL RA1 100 RA2 100 DVDD 1 DGND 2 XIN 3 XOUT 4 RESET 5 DSYNC 6 PDWN 7 DGND 8 VREF 9 VREF 10 AIN0 D0 11 AIN1 D1 12 AIN4 D4 13 AIN5 D5 14 AIN6 D6 15 AIN7 D7 16 AIN2 D2 17 AIN3 D3 18 AINCOM 19 AGND 20 AVDD 21 POL 22 CS 23 DIN 24 DOUT 25 SCLK 26 DRDY 27 BUFEN 28 U1 ADS1241E CNTL DSYNC RA3 100 C19 18P GPIO1 GPIO0 GPIO5 C11 DNP C12 DNP C1...

Страница 9: ...E 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 ...

Страница 10: ...siness practice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necess...

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