Texas Instruments MSOP-8EVM Manuale utente

User's GuideSBAU140 – December 2008

MSOP-8EVM and MSOP-8EVM-PDK

Figure 1. MSOP-8EVM (Left) and MSOP-8EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the MSOP-8EVM, both by itself andas part of the MSOP-8EVM-PDK. This EVM is an evaluation board for single-channel, 14- to 16-bit,analog-to-digital converter (ADC) devices in an MSOP-8 package. A complete circuit description,schematic diagram, and bill of materials are included with this document.

This manual covers the operation of both the MSOP-8EVM and the MSOP-8EVM-PDK. It does notdescribe the MMB0 motherboard in detail. Throughout this document, the abbreviation EVM and the termevaluation module are synonymous with the MSOP-8EVM.

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Contents1 EVM Overview ............................................................................................................... 32 Analog Interface .............................................................................................................. 43 Digital Interface .............................................................................................................. 44 Power Supplies .............................................................................................................. 55 EVM Operation ............................................................................................................... 76 MSOP-8EVM-PDK Kit Operation .......................................................................................... 87 Evaluating with the ADCPro Software ................................................................................... 18Appendix A Bill of Materials (BOM) and Schematic ........................................................................ 21

List of Figures

1 MSOP-8EVM (Left) and MSOP-8EVM-PDK (Right) .................................................................... 12 MMB0 Initial Setup........................................................................................................... 93 MSOP-8 EVM Board Initial Setup ........................................................................................ 104 Connecting the MSOP-8EVM to the MMB0 Motherboard ............................................................ 105 Connecting an AC Adapter ............................................................................................... 116 Laboratory Power-Supply Connection ................................................................................... 127 ADCPro Software Start-up Display Window ............................................................................ 138 ADS8326EVM-PDK Plug-In Display Window........................................................................... 149 Found New Hardware Wizard, Screen 1 ................................................................................ 1510 Found New Hardware Wizard, Screen 2 ................................................................................ 1511 Found New Hardware Wizard, Screen 3 ................................................................................ 1612 Found New Hardware Wizard, Screen 4 ................................................................................ 1613 Found New Hardware Wizard, Screen 5 ................................................................................ 1714 Continuous Clock—Max SCLK ........................................................................................... 1815 Clockstop Mode—Max SCLK ............................................................................................. 1916 Continuous Mode—Stretched SCLK .................................................................................... 1917 Progress Bar While Collecting Data ..................................................................................... 20

List of Tables

1 Related Documentation ..................................................................................................... 32 J1—Analog Interface Pinout ................................................................................................ 43 J2—Digital Interface Pinout ................................................................................................ 44 J3 Pinout ...................................................................................................................... 55 Jumper Descriptions ......................................................................................................... 7A-1 Bill of Materials ............................................................................................................. 21

ADCPro is a trademark of Texas Instruments.Windows is a registered trademark of Microsoft Corporation.All other trademarks are the property of their respective owners.

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1 EVM Overview

1.1 Features

1.2 Introduction

1.3 Related Documentation

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EVM Overview

MSOP-8EVM Features:•Full-featured evaluation board for a variety of single-channel, 8-pin, micro-SOP, 14- to 16-bit, serialoutput, ADCs•Onboard reference and buffer circuits•High-speed serial interface•Modular design for use with a variety of DSP and microcontroller interface boards

For use with a computer, the MSOP-8EVM-PDK is available. This kit combines the MSOP-8EVM boardwith the DSP-based MMB0 motherboard, and includes ADCPro software for evaluation.

The MMB0 motherboard allows the MSOP-8EVM to be connected to the computer via an available USBport. This manual shows how to use the MMB0 as part of the MSOP-8EVM-PDK, but does not providetechnical details on the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is basedon a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.The MSOP-8EVM-PDK is controlled by a plug-in that is executed in ADCPro.

The modular MSOP-8 evaluation module is an updated version of the popular Burr-Brown DEM-MSOP-8evaluation board. The EVM is designed so that a single printed wiring board (PWB) supports a variety oftest configurations for high-speed 14- and 16-bit serial ADCs.

The modular EVM form factor allows for direct evaluation of the ADC performance and operatingcharacteristics. This EVM is compatible with the 5-6K Interface Board (SLAU104 ), also available fromTexas Instruments.

Table 1 lists documents related to the MSOP-8EVM. To obtain a copy of any of these TI documents, callthe Texas Instruments Literature Response Center at (800) 477-8924 or the Product Information Center(PIC) at (972) 644-5580. When ordering, identify this booklet by its title and literature number. Updateddocuments can also be obtained through our website at www.ti.com .

Table 1. Related Documentation

EVM-Compatible Device Data Sheets Literature Number

ADS8320 SBAS108ADS8321 SBAS123ADS8324 SBAS172ADS8325 SBAS226ADS8326 SBAS343

Application Notes/Additional Literature from TI Literature Number

Op Amps for Everyone SLOD0065-6K Interface Board SLAU104Single and Bipolar Signal Conditioning Boards SLAU105

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2 Analog Interface

3 Digital Interface

Analog Interface

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For maximum flexibility, the modular MSOP-8EVM 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 a convenient,10-pin, dual-row header/socket combination at J1. This header/socket provides access to the analog inputpins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety ofmating connector options.

Table 2. J1—Analog Interface Pinout

Pin Number Signal Description

J1.2 AD_IN+ Noninverting input for differential devices, and analog input for single-ended devicesJ1.4 AD_IN– Inverting input for differential devices, and analog ground for single-ended devicesJ1.6 UnusedJ1.8 UnusedJ1.10 Unused

Pins are unused and should be left open for use with future amplifier and sensor inputmodulesJ1.12 UnusedJ1.14 UnusedJ1.16 UnusedJ1.18 REF(–) UnusedJ1.20 REF(+) External reference source inputJ1.15 Unused UnusedJ1.1 to J1.19

AGND Analog ground connections (except J1.15)(odd)

The modular MSOP-8EVM is designed for easy interfacing to 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-rowheader/socket combination at J2. This header/socket provides access to the digital control and serial datapins of the MSOP-8EVM. Consult Samtec at http://www.samtec.com or 1-800-SAMTEC-9 for a variety ofmating connector options.

Table 3. J2—Digital Interface Pinout

Pin Number Signal Name Description

Chip select, active low signal. Enables data transfer, jumper configurable (see theJ2.1 CS

schematic located at the end of this document)J2.3 SCLK Serial clockJ2.5 SCLKr Serial clock return (for DSP host systems)Frame sync for DSP host systems; alternate chip select through JMP2 (see the schematicJ2.7 FS

located at the end of this document)J2.9 FSr Frame sync return (for DSP host systems)J2.11 Unused UnusedJ2.13 SDO Serial data outputJ2.15 Unused UnusedJ2.17 Unused UnusedJ2.19 SPARE

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4 Power Supplies

4.1 ADC Power

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Power Supplies

The modular MSOP-8EVM board requires +5V dc for the analog section. This power source supplies thevoltage reference (U2), the reference buffer (U4), and optionally, the ADC installed on the EVM (viaJMP1). Supply voltages of +1.8V to +5V dc for the digital section are also required. When used incombination with one of the DAP Interface boards, J3 provides connection to the common power busdescribed in the 5-6 K Interface Board User's Guide, (SLAU104 ). Table 4 shows the pinout for J3.

Table 4. J3 Pinout

Pin Number Signal Pin Number Signal

1 Unused 6 AGND2 Unused 7 +1.8VD3 +5VA 8 +VD14 Unused 9 +3.3VD5 DGND 10 +5VD

When power is supplied to J3, JMP3 allows for one of four different dc voltages to be applied to the digitalsections of the ADC. Review the schematic (located at the end of this document) and PWB silkscreen(see Figure 3 ) for further details.

The device installed on the modular MSOP-8EVM has several options with regard to its power source.Refer to the schematic shown at the end of this document for details about the following information.

JMP1 and JMP3 allow the user to select the power supply used by the ADC. When JMP1 is in the defaultfactory position (shunt on pins 1-2), power to the ADC comes from J3.3 or TP5. Single gate digital buffers(U3, U5, and U6) are installed on the ADC digital input/output lines to allow operation with low-voltagecontrollers, such as the MSP430. The supply voltage to these buffers is determined by JMP3 or thevoltage applied to TP7.

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4.2 Standalone Operation

4.3 Reference Voltage

Power Supplies

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When used as a standalone EVM, the analog power can be applied to TP5 and referenced to TP6. Digitalpower can be applied to TP7, referenced to TP4. While filters are provided for all power-supply inputs,optimal performance of the EVM requires a clean, well-regulated power source.

CAUTION

The ADCs that are compatible with this EVM have a variety of power-supplyrequirements. Check the appropriate data sheet and verify that all powersupplies are within the safe operating limits of the ADC before applying powerto the EVM.

The modular MSOP-8 can be configured to use the onboard reference/buffer circuits (U2 and U4) or anexternal reference applied to J1.20. Jumpers JMP5 and JMP6 control the reference source. In the factorydefault position (shunt on JMP5 pins 1-2), a 2.5V reference is supplied by U2. Moving the shunt at JMP5to positions 2-3 allows an external reference applied to J1.20 to be used.

CAUTION

The ADCs that are compatible with this EVM have a variety of referencerequirements. Check the appropriate data sheet and verify that the externalreference sources are within the safe operating limits of the ADC beforeapplying power to the EVM.

JMP6 controls the actual application of the reference source to the ADC. In the factory default position(shunt on pins 1-2), the reference source is the onboard reference/buffer circuit. Moving the shunt to JMP6to pins 2-3 allows the voltage applied to the ADC (+V

ADC

) to be used as the reference source.

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5 EVM Operation

5.1 Analog Input

5.2 Digital Control

5.3 Chip Select (Shutdown)

5.4 Digital I/O Buffers

5.5 Default Jumper Locations

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EVM Operation

This section provides information on the analog input, digital control, and general operating conditions ofthe MSOP-8EVM.

The analog input source can be applied directly to J1 (top or bottom side) or through optional amplifier andsignal conditioning modules. The analog input range depends on the configuration of the EVM and theADC installed at location U1. Consult the specific device data sheet to determine the maximum analoginput range.

The digital control signals can be applied directly to J2 (top or bottom side). The modular MSOP-8EVMcan also be connected directly to a DSP or microcontroller interface board. Visit the product folder for theMSOP-8EVM or the installed device for a current list of compatible interfaces and/or recommendedaccessory boards.

Jumper JMP2 is provided to allow the selection of the signals applied to the chip select ( CS) or shutdown(SHDN) pin of the ADC installed on the EVM. The factory default condition for the EVM has a shuntjumper placed between pins 1-2 of JMP2. This configuration allows the Frame Sync (FS) signal from aDSP host system to be used as a chip select for the ADC. This signal originates from J2.7. When JMP2 ismoved to pins 2-3, the CS (SHDN) signal is applied via J2.1.

Single gate buffers U3, U5, and U6 are provided to ensure the safe operation of the modular MSOP-8EVMwith low-voltage host controllers. The digital I/O voltage applied to these buffers via JMP3 should be set inaccordance with the operating voltage of the host controller.

Table 5 lists the jumpers found on the EVM and the respective factory default condition of each.

Table 5. Jumper DescriptionsJumper Shunt Position Jumper Description

JMP1 Pins 1-2 Controls ADC supply voltage (default is +5V analog source)

JMP2 Pins 1-2 Controls ADC CS (SHDN) pin (default is FS from DSP host)

JMP3 Pins 5-6 Controls digital I/O voltage (default is +3.3V digital source)

JMP4 CLOSED Ties analog and digital grounds together

JMP5 Pins 1-2 Controls external reference source (default is +2.5V from U2)

JMP6 Pins 1-2 Controls reference source to ADC (default is onboard reference/buffer circuit)

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6 MSOP-8EVM-PDK Kit Operation

6.1 Installing the ADCPro Software

MSOP-8EVM-PDK Kit Operation

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This section provides information on using the MSOP-8EVM-PDK, including setup, program installation,and program usage.

To prepare to evaluate the MSOP-8EVM with the MSOP-8EVM-PDK, complete the following steps:Step 1. Install the ADCPro software (if not already installed).Step 2. Install the MSOP-8EVM-PDK EVM plug-in software.Step 3. Set up the MSOP-8EVM-PDK.Step 4. Connect a proper power supply or use the included ac adapter.Step 5. Run the ADCPro software.Step 6. Complete the Microsoft Windows

USB driver installation process.

Each step is described in the subsequent sections of this document.

Do not connect the MSOP-8EVM-PDK before installing the software. Failure to observe this proceduremay cause Windows to not recognize the MSOP-8EVM-PDK.

The latest software is available from Texas Instruments' website at http://www.ti.com/ . The CD-ROMshipped with the MSOP-8EVM may not contain the latest software, but the ADCPro installer will check forupdates when run, if connected to the Internet, and then give you the option of downloading and installingthe latest version. Refer to the ADCPro User's Guide for instructions on installing and using ADCPro.

To install the MSOP-8EVM-PDK plug-in, run the file: adsXXXXevm-pdk-plugin-1.0.0.exe for the installeddevice ( 1.0.0 is the version number, and increments with software version releases; you may have adifferent version on your CD). Double-click the file to run it; then follow the instructions shown. You canalso use the ADCPro Update Check feature to check for newer versions of the MSOP-8EVM-PDK plug-in,once you have installed one version of it.

The software should now be installed, but the USB drivers may not yet have been loaded by the PCoperating system. This step completes when the ADCPro software is executed; see the section titledRunning the Software and Completing Driver Installation .

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6.2 Setting Up the MSOP-8EVM-PDK

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MSOP-8EVM-PDK Kit Operation

The MSOP-8EVM-PDK contains both the MSOP-8EVM and the MMB0 motherboard; however, thedevices are shipped unconnected. Follow these steps to set up the MSOP-8EVM-PDK:Step 1. Unpack the MSOP-8EVM-PDK kit.Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 2 .a. Set the Boot Mode switch to USB.b. Connect +5V and +5VA on jumper block J13 (if +5V is supplied from J14 +5VA).c. Leave +5V and +VA disconnected on jumper block J13.d. If the PDK will be powered from an ac adapter, and used in unipolar mode, connect J12. Ifthe PDK will be powered through the terminal block or will be used in bipolar mode,disconnect J12.

Figure 2. MMB0 Initial Setup

Step 3. Set the jumpers on the MSOP-8 EVM board as shown in Figure 3 (note that these jumpersare the factory-configured settings for the MSOP-8 EVM):a. Set I/O Voltage jumper block JMP3 as shown in Figure 3 .b. Set the reference source select jumpers (JMP5 and JMP6) to the onboard/BUF positions.c. Set the CS/SHDN source select jumper (JMP2) to the FS position.d. Set up VCC jumper block JMP1 as shown in Figure 3 .

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6.2.1 About the MMB0

MSOP-8EVM-PDK Kit Operation

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Figure 3. MSOP-8 EVM Board Initial Setup

Step 4. Plug the MSOP-8EVM into the MMB0.

Figure 4. Connecting the MSOP-8EVM to the MMB0 Motherboard

CAUTION

Do not misalign the pins when plugging the MSOP-8EVM into the MMB0.Check the pin alignment of J1, J2 and J3 carefully before applying power to thePDK.

The MMB0 is a modular EVM system motherboard. It is designed around the TMS320VC5507 , a DSPfrom Texas Instruments that has an onboard USB interface. The MMB0 also has 16MB of SDRAMinstalled.

The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offersupport for the MMB0 except as part of an EVM kit. For schematics or other information about the MMB0,contact Texas Instruments.

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