Texas Instruments ADS1241MEVM Manual de usuario

User's GuideSBAU106 – October 2004

ADS1241MEVM

This user's guide describes the characteristics, operation, and use of theADS1241MEVM. This EVM is a 24-bit analog-to-digital converter evaluation module. Acomplete circuit description, schematic diagram, and bill of materials are included.

The following related documents are available through the Texas Instruments web siteat www.ti.com .

EVM-Compatible Device Data Sheets

LiteratureDevice Number

ADS1241 SBAS173REF1004 SBVS002OPA350 SBOS099SN74LVC1G126 SCES224

Contents1 EVM Overview ............................................................................................................... 22 Analog Interface ............................................................................................................ 23 Digital Interface ............................................................................................................. 34 Power Supplies ............................................................................................................. 35 EVM Operation .............................................................................................................. 56 EVM Bill of Materials and Schematic ................................................................................... 7

List of Figures

1ADS1241MEVM Switch and Jumper Locations ...................................................................... 5

List of Tables

1Analog Interface Pinout ................................................................................................... 22Digital Interface Pinout .................................................................................................... 33Power Supply Pinout ...................................................................................................... 34Reference Selection Options - S6 and S7 ............................................................................. 45Input Selection Options - S1 through S4 .............................................................................. 56AINCOM Selection Options - S5 ......................................................................................... 57ADS1241MEVM Bill of Materials ......................................................................................... 7

Speedy33 is a trademark of Hyperception, Inc..

1SBAU106 – October 2004 ADS1241MEVM

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1 EVM Overview

1.1 Features

1.2 Introduction

2 Analog Interface

EVM Overview

•Full-featured evaluation board for the ADS1241 24-bit analog-to-digital converter•On-board reference and oscillator circuits•

Modular

design

for

use

with

variety

DSP

and

microcontroller

interface

boards

The ADS1241MEVM is in Texas Instruments' modular EVM form factor, which allows directevaluation of the ADS1241 performance and operating characteristics, and eases softwaredevelopment and system prototyping. This EVM is compatible with the 5-6K Interface Board(SLAU104) from Texas Instruments and additional third-party boards such as the HPA449demonstration board from SoftBaugh, Inc. (www.softbaugh.com ) and the Speedy33™ fromHyperception, Inc. (www.hyperception.com ).

For maximum flexibility, the ADS1241MEVM is designed for easy interfacing to multiple analogsources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide aconvenient 10-pin, dual-row, header/socket combination at J1. This header/socket providesaccess to the analog input pins of the ADS1241. Consult Samtec at www.samtec.com or call1-800-SAMTEC-9 for a variety of mating connector options.

Table 1. Analog Interface Pinout

Pin Number Signal Description

J1.1 AN0- ADS1241 AN1J1.2 AN0+ ADS1241 AN0J1.3 AN1- ADS1241 AIN3J1.4 AN1+ ADS1241 AIN2J1.5 AN2- ADS1241 AIN5J1.6 AN2+ ADS1241 AIN4J1.7 AN3- ADS1241 AIN7J1.8 AIN3+ ADS1241 AIN6J1.10 AIN4+ ADS1241 AINCOMJ1.15 VCOM Tied to onboard 2.5V referenceJ1.18 REF(-) External reference source low sideJ1.20 REF(+) External reference source input (2.5V NOM)J1.9-J1.19 (odd) GND Analog ground connections (except J1.15)J1.12-J1.16 (even) Unused

ADS1241MEVM 2 SBAU106 – October 2004

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3 Digital Interface

4 Power Supplies

Digital Interface

The ADS1241MEVM is designed to easily interface with multiple control platforms. Samtec partnumbers 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 provides access to the digitalcontrol and serial data pins of the ADS1241. Consult Samtec at www.samtec.com or call1-800-SAMTEC-9 for a variety of mating connector options.

Table 2. Digital Interface Pinout

Pin Number Signal Description

J2.1 DSYNC Synchronization controlJ2.2 PWDN Power downJ2.3 SCLK Serial clockJ2.4 DGND Digital groundJ2.5 UnusedJ2.6 GPIO1 Oscillator kickstart (see Section 5.3.1.1 )J2.7 CS Chip select - Active low signal, enables data transfer. Frame sync on DSP host systems.J2.8 GPIO2 Oscillator kickstart enable (see Section 5.3.1.1 )J2.9 UnusedJ2.10 DGND Digital groundJ2.11 DIN Serial data input to ADS1241 from hostJ2.12 BUFEN Buffer enableJ2.13 DOUT Serial data output from ADS1241 to hostJ2.14 POL Serial clock polarityJ2.15 DRDY Data readyJ2.16 SCL I

C bus serial clockJ2.17 TOUT External clock input to ADS1241J2.18 DGND Digital groundJ2.19 RESET Resets ADS1241 deviceJ2.20 SDA I

C bus data line

J3 provides connection to the common power bus for the ADS1241MEVM. Power is supplied onthe pins listed in Table 3 .

Table 3. Power Supply Pinout

Signal Pin Number Signal

Unused 1 2 Unused+5VA 3 4 UnusedAGND 5 6 DGNDUnused 7 8 Unused+3.3VD 9 10 +5VD

When power is supplied to J3, J4 allows for either 3.3V of 5V to be applied to the digital sectionsof the ADS1241. J4 also provides for a method of measuring AVDD and DVDD supply currentsif the shunts on J4.1-2 and J4.3-4 are removed and a current meter is connected between theappropriate pins. See the schematic and Figure 1 for details.

ADS1241MEVMSBAU106 – October 2004 3

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4.1 ADC Power

4.2 Stand-Alone Operation

4.3 Reference Voltage

Power Supplies

Power for the ADS1241 analog supply voltage (AVDD) comes from +5VA, which is suppliedthrough J3.3. The shunt from J4 pins 1 to 2 applies this supply to the ADS1241 device.The ADS1241 digital supply voltage (DVDD) is selected using J4. When a shunt is applied fromJ4 pins 5 to 6, +5VD is selected, and this power comes from J3.10. If a shunt is placed from J4pins 7 to 8 (the default factory setting), +3.3VD is selected, which is provided from J3.9. J4 pins9 and 10 provide a way to connect the analog and digital grounds; these pins are connected bydefault when the EVM is shipped from the factory.

CAUTIONVerify that all power supplies are within the safe operating limits shown onthe ADS1241 data sheet before applying power to the EVM. Note that ashunt should only be connected between J4 pins 7 and 8 OR pins 5 and 6,but never both; doing so would short the +3.3V supply to the +5V digitalsupply.

When used as a stand-alone EVM, the analog power can be applied to J4.1, referenced toJ4.10. DVDD can be applied to J4.3, referenced to J4.10. Note that this EVM uses only a singleground plane.

The ADS1241 requires an external voltage reference. Two switches, S6 and S7, select thesource of the reference for the ADS1241. An external reference may be supplied through J1 pin20 on the ADS1241MEVM. A 2.5V reference is provided on the EVM for convenience, or thesupply voltage may also be used as the device reference voltage. These different referencesources can be selected using S6 and S7, as shown in Table 4 . Note that the ADS1241reference is differential, so both VREF+ and VREF- pins may take on several voltages. Refer tothe ADS1241 data sheet.

CAUTIONVerify that the external reference voltage is within the safe operating limitsshown on the ADS1241 data sheet before applying power to the EVM.

Table 4. Reference Selection Options - S6 and S7

S6 Position S7 Position VREF+ VREF- Comment

Left Left External (J1.20) External (J1.18)Middle Left 2.5V External (J1.18)Right Left AVDD External (J1.18)Left Middle External (J1.20) GroundMiddle Middle 2.5V GroundRight Middle AVDD GroundLeft Right External (J1.20) 2.5V

This results in a 0VMiddle Right 2.5V 2.5V reference - not a veryuseful setting.Right Right AVDD 2.5V

ADS1241MEVM 4 SBAU106 – October 2004

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5 EVM Operation

MIDDLE

RIGHTLEFT

LEFT

(External)

RIGHT

(Onboard)

5.1 Analog Input

EVM Operation

The following section provides information on the analog input, digital control, and generaloperating conditions of the ADS1241MEVM. Refer to Figure 1 for switch and jumper locations,and the meanings of left,middle, and right for switch settings in the following discussion.

Figure 1. ADS1241MEVM Switch and Jumper Locations

The analog input sources can be applied directly to J1 (top or bottom side) or through optionalamplifier and signal-conditioning modules. Consult the ADS1241 data sheet to determine themaximum analog input range. Switches S1-S5 can be used to select the source for inputsAIN0-3, 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 Selected

J1.2 for AIN0J1.1 for AIN1Left

J1.4 for AIN2J1.3 for AIN3Middle Ground for AIN0-3Right 2.5V for AIN0-3

Table 6. AINCOM Selection Options - S5

Switch Position Input Selected

Left J1.10Middle GroundRight 2.5V

ADS1241MEVMSBAU106 – October 2004 5

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5.2 Digital Control

5.3 Clock Source

EVM Operation

The digital control signals can be applied directly to J2 (top or bottom side). The modular

ADS1241MEVM can also be connected directly to a DSP or microcontroller interface board,

such as the HPA449. For a current list of compatible interface and/or accessory boards for the

EVM or the ADS1241, see the relevant product folder on the TI web site.

5.3.1 Onboard Oscillator

The ADS1241 requires a clock. A 4.9152MHz crystal is provided on the EVM, and may be

selected as the clock source for the device when switch S8 is in the right-hand position.

5.3.1.1 Oscillator Kickstart (Experimental)

Because the ADS1241 is a low power device, its clock oscillator circuit does not have extremely

strong drive capabilities. Using the crystal and load capacitor values provided on the EVM, the

clock 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 possibility for decreasing oscillator startup times. This kickstart circuit is designed to provide a

pulse of energy to the crystal to help get it started oscillating.

In use, the enable for the kickstart circuit (GPIO2) would be pulled high to activate the circuit. A

rising edge would then be applied to GPIO1, which should result in a pulse appearing at the

output of C19. Once the crystal has begun oscillating, GPIO2 should be brought low to remove

the kickstart circuit from the oscillator.

5.3.2 External Oscillator

When S8 is switched to the left, the clock source for the ADS1241 is provided from J2.13.

ADS1241MEVM6 SBAU106–October 2004

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6 EVM Bill of Materials and Schematic

6.1 ADS1241MEVM Schematic

EVM Bill of Materials and Schematic

The following table contains a complete bill of materials for the modular ADS1241MEVM.

Table 7. ADS1241MEVM Bill of Materials

Reference Designator Description Manufacturer Mfg. Part Number

R3, R4, R5, R6, R7, R8, R9, 0 Ω1/8W 5% Chip Resistor Panasonic ERJ-6GEY0R00VR10

R2, R11 10K Ω1/10W 5% Chip Resistor Panasonic ERJ-3GEYJ103VR1 24.9K Ω1/16W 1% Chip Panasonic ERJ-3EKF2492VResistorRA1, RA2, RA3 100 Ω1/8W 5% 4 Resistor, CTS Corporation 744C083101JTR8 Terminal NetworkC21 12pF 50V Ceramic TDK C1608C0G1H120JChip Capacitor, ±5%, C0GC19, C20 18pF 50V Ceramic TDK C1608C0G1H180JChip Capacitor, ±5%, C0GC2, C5 0.01µF 50V Ceramic TDK C2012X7R1H103KChip Capacitor, ±10%, X7RC13 1µF 16V Ceramic TDK C1608X5R1C105KChip Capacitor, ±10%, X5RC14, C16 1µF 16V Ceramic TDK C2012X7R1C105KChip Capacitor, ±10%, X7RC15, C18 4.7µF 6.3V Ceramic TDK C1608X5R0J475MChip Capacitor, ±20%, X5RC17 22µF 16V Ceramic TDK C3225X5R1C226MChip Capacitor, ±20%, X5RC1, C3, C4, C6, C7, C8, C9, Ceramic Chip Capacitor - NotC10, C11, C12 InstalledX1 4.9152MHz Crystal, Thru-hole CTS ATS042U1 Analog to Digital Converter Texas Instruments ADS1241EU2 Op Amp Texas Instruments OPA350UAU3 2.5V Reference Texas Instruments REF1004I-2.5U4 256K I

C EEPROM MicroChip 24LC256-I/SNU5 Tri-State Buffer, Single Gate Texas Instruments SN74LVC1G126DBVADS1241MEVM PCB Texas Instruments 6462006J1A, J2A 20-pin SMT Plug Samtec TSM-110-01-L-DV-PJ1B, J2B 20-pin SMT Socket Samtec SSW-110-22-F-D-VS-KJ3A 10-pin SMT Plug Samtec TSM-105-01-L-DV-PJ3B 10-pin SMT Socket Samtec SSW-105-22-F-D-VS-KJ4 5 X 2 Position Header Samtec TSW-105-07-L-D0.1" spacingJ5 1 X 2 Position Header Samtec TSW-102-07-L-S0.1" spacingS1, S2, S3, S4, S5, S6, S7 SP3T Ultra-miniature switch NKK Switches SS14MDP2S8 DPDT Ultra-miniature switch NKK Switches SS22SDP2TP1 Miniature Test Point Terminal Keystone Electronics 5000Header Shorting Block Samtec SNT-100-BK-T

The schematic diagram is provided as a reference.

ADS1241MEVMSBAU106 – October 2004 7

1 2 3 4 5 6

54321

6730 SOUTH TUCSON BLVD., TUCSON, AZ 85706 USA

TITLE

SHEET OF FILE

SIZE DATE REV22-Sep-2004

DRAWN BY

ENGINEER

REVISION HISTORY

REV ENGINEERING CHANGE NUMBER APPROVED

DATA ACQUISITION PRODUCTS

HIGH-PERFORMANCE ANALOG DIVISION

SEMICONDUCTOR GROUP

M. ASHTON

D:\ads1241mevm\ads1241mpm.ddb - ads1241mevm.sch

ADS1241MEVM

DOCUMENT CONTROL NO. 6462007

+VA

1-VA 2

+5VA

3-5VA 4

AGND

5DGND 6

+1.8VD

7VD1 8

+3.3VD

9+5VD 10

POWERHDR

OPA350

REF1004I-2.5

10K

24.9K 1%

AVDD

C16

1U 16V X7R

AVDD

C17

22U

AN0+ 2

AN1+ 4

AN2+ 6

AN3+ 8

AN4+ 10

AN5+ 12

AN6+ 14

AN7+ 16

REF- 18

REF+ 20

AGND

AN0-

AN1-

AN2-

AN3-

AGND

VCOM

ANALOGHDR

SCLK

DIN

DOUT

DRDY

PDWN

RESET

CLKX

FSX

INT

ADCDVDD

GND 4

SDA 5

SCL 6

VCC 8

MCP_24LC256-I/SN

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+

VREF-

AIN0/D0

AIN1/D1

AIN4/D4

AIN5/D5

AIN6/D6

AIN7/D7

AIN2/D2

AIN3/D3

AINCOM

AGND

AVDD

POL 22

CS 23

DIN 24

DOUT 25

SCLK 26

DRDY 27

BUFEN 28

ADS1241E

CNTLDSYNC

RA3

100

C19

18P

GPIO1

GPIO0

GPIO5

C11

DNP

C12

DNP

C10

DNP

10N

DNP

10N

DNP

AIN0

AIN1

AIN2

AIN3

AINCOM

AN0-

AN1-

AN2-

AN3-

BUFEN

POL

XIN

XOUT

DVDD

TP1

XOUT

GPIO3

GPIO4

TOUT

GPIO2

SN74LVC1G126DBV

R3 0

R4 0

R5 0

R6 0

R7 0

R8 0

R9 0

R10 0

AIN4

AIN5

AIN6

AIN7

C13

NKK_SS14MDP2

AVDD

C14

1 2

3 4

5 6

7 8

9 10

JPR-2X5

DVDD

AVDD

OBREF

AN0+

AN1+

AN2+

AN3+

C15

4.7U

C18

4.7U

REF-

REF+

AN4+

ADCAVDD

NKK_SS22SDP2

AVDD

GPIO0 2

DGND 4

GPIO1 6

GPIO2 8

DGND 10

GPIO3 12

GPIO4 14

SCL 16

DGND 18

SDA 20

CNTL

CLKX

CLKR

FSX

FSR

INT

TOUT

GPIO5

J2 SERIALHDR

1 2

R11

10K

DVDD

FCC Warnings

This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequencyenergy 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 otherenvironments may cause interference with radio communications, in which case the user at his own expense will be required totake whatever measures may be required to correct this interference.

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 ONLYand is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms ofrequired design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typicallyfound in the end product incorporating the goods. As a prototype, this product does not fall within the scope of the European Uniondirective 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 daysfrom the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLERTO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANYWARRANTY 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 allclaims arising from the handling or use of the goods. Please be aware that the products received may not be regulatory compliantor agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is the user's responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE Liable to the other FORANY 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 ofpatents 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 tohandling the product. This notice contains important safety information about temperatures and voltages. For further safetyconcerns, 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, orcombination in which such TI products or services might be or are used.

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 2.7 V to 5 V 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 arequestions 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 theEVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the loadspecification, please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than 30 °C. The EVM is designed tooperate properly with certain components above 85 °C as long as the input and output ranges are maintained. These componentsinclude but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types ofdevices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes nearthese devices during operation, please be aware that these devices may be very warm to the touch.

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements,improvements, and other changes to its products and services at any time and to discontinue any product or service without notice.Customers should obtain the latest relevant information before placing orders and should verify that such information is current andcomplete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’sstandard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support thiswarranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarilyperformed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products andapplications using TI components. To minimize the risks associated with customer products and applications, customers shouldprovide adequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, maskwork right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or servicesare used. Information published by TI regarding third-party products or services does not constitute a license from TI to use suchproducts or services or a warranty or endorsement thereof. Use of such information may require a license from a third party underthe patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and isaccompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is anunfair and deceptive business practice. TI is not responsible or liable for such altered documentation.Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or servicevoids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive businesspractice. 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 wouldreasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreementspecifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramificationsof their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-relatedrequirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding anyapplications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and itsrepresentatives against any damages arising out of the use of TI products in such safety-critical applications.TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products arespecifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet militaryspecifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade issolely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements inconnection with such use.TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI productsare designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use anynon-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements.Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products Applications

Amplifiers amplifier.ti.com Audio www.ti.com/audioData Converters dataconverter.ti.com Automotive www.ti.com/automotiveDSP dsp.ti.com Broadband www.ti.com/broadbandInterface interface.ti.com Digital Control www.ti.com/digitalcontrolLogic logic.ti.com Military www.ti.com/militaryPower Mgmt power.ti.com Optical Networking www.ti.com/opticalnetworkMicrocontrollers microcontroller.ti.com Security www.ti.com/securityRFID www.ti-rfid.com Telephony www.ti.com/telephonyLow Power www.ti.com/lpw Video & Imaging www.ti.com/videoWireless

Wireless www.ti.com/wireless

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