Texas Instruments ADS1281EVM User manual

User's Guide
SBAU143C–March 2009–Revised May 2011
ADS1281EVM and ADS1281EVM-PDK User's Guide
ADS1281EVM (Left) and ADS1281EVM-PDK (Right)
This user's guide describes the characteristics, operation, and use of the ADS1281EVM, both by itself and
as part of the ADS1281EVM-PDK. This evaluation model (EVM) is an evaluation board for the ADS1281,
a high-performance, 32-bit, single-channel, delta-sigma analog-to-digital converter (ADC). The EVM allows
evaluation of all aspects of the ADS1281. 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 Device Literature Number
ADS1281 SBAS378B SN74LVC2G157 SCES207K
REF5025 SBOS410C SN74LVC1G07 SCES296W
REF5050 SBOS410C SN74AHCT1G04 SCLS319N
OPA2350 SBOS099C TPS79225 SLVS337B
OPA1632 SBOS286A TPS72325 SLVS346B
PCA9535 SCPS129H
ADCPro is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
I2C is a trademark of NXP Semiconductors.
NI-VISA is a trademark of National Instruments.
All other trademarks are the property of their respective owners.
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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 Power-Down, Mode and Format Control ................................................................................. 6
7 Clock Source ................................................................................................................ 6
8 EVM Operation .............................................................................................................. 7
9 ADS1281EVM-PDK Kit Operation ........................................................................................ 8
10 Running the Software and Completing Driver Installation ........................................................... 13
11 Evaluating Performance with the ADCPro Software .................................................................. 20
12 Schematics and Layout ................................................................................................... 25
List of Figures
1 Connectors for J7........................................................................................................... 5
2 Switch S1 .................................................................................................................... 6
3 Jumper J3.................................................................................................................... 6
4 ADS1281EVM Default Jumper Locations................................................................................ 7
5 MMB0 Initial Setup ......................................................................................................... 9
6 Connecting ADS1281EVM to MMB0 ................................................................................... 10
7 Using the +6V Wall Supply for +5V..................................................................................... 11
8 Using a External Supply For +5V ....................................................................................... 12
9 NI-VISA Driver Installation ............................................................................................... 13
10 NI-VISA Driver Installation Question ................................................................................... 14
11 NI-VISA Driver Installing ................................................................................................. 14
12 NI-VISA Driver Complete Installation .................................................................................. 15
13 NI-VISA Driver Verification Using Device Manager .................................................................. 15
14 ADCPro Software Start-up Display Window ........................................................................... 16
15 ADS1281EVM-PDK Plug-In Display Window.......................................................................... 17
16 Install New Driver Wizard Screen 1..................................................................................... 18
17 Install New Driver Wizard Screen 2..................................................................................... 18
18 Install New Driver Wizard Screen 3..................................................................................... 19
19 Install New Driver Wizard Screen 4..................................................................................... 19
20 Install New Driver Wizard Screen 5..................................................................................... 20
21 USBStyx Driver Verification Using Device Manager.................................................................. 20
22 Data Rate Select .......................................................................................................... 21
23 Digital Filter................................................................................................................. 21
24 Controls..................................................................................................................... 22
25 Calibration.................................................................................................................. 23
26 Progress Bar While Collecting Data .................................................................................... 24
List of Tables
1 J6: Analog Interface Pinout................................................................................................ 4
2 J5: Serial Interface Pins.................................................................................................... 4
3 J3 Configuration: Power-Supply Input.................................................................................... 5
4 Bill of Materials ............................................................................................................ 25
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1 EVM Overview
1.1 Features
ADS1281EVM:
•Contains all support circuitry needed for the ADS1281
•Voltage reference options: external or onboard
•Clock options: External clock source or 4.096MHz onboard crystal oscillator
•Compatible with the TI Modular EVM System
ADS1281EVM-PDK:
•Easy-to-use evaluation software for Microsoft®Windows®XP
•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 ADS1281EVM-PDK is available. This kit combines the ADS1281EVM board
with the DSP-based MMB0 motherboard, and includes ADCPro™software for device evaluation.
The MMB0 motherboard allows the ADS1281EVM to be connected to the computer via an available USB
port. This manual shows how to use the MMB0 as part of the ADS1281EVM-PDK, but does not provide
technical details about the MMB0 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 ADS1281EVM-PDK is controlled by a plugin running in ADCPro. For more information about ADCPro,
see the ADCPro™Analog-to-Digital Converter Evalutation Software User's Guide (literature number
SBAU128), available for download for the TI web site.
This manual covers the operation of both the ADS1281EVM and the ADS1281EVM-PDK. Throughout this
document, the abbreviation EVM and the term evaluation module are synonymous with the
ADS1281EVM.
1.2 Introduction
The ADS1281EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any modular EVM system interface card.
The ADS1281EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS1281EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the
ADS1281EVM is useful for prototyping designs and firmware.
Note that the ADS1281EVM 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 ADS1281EVM 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 J6. This header/socket provides access to the analog input pins of
the ADS1281. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options.
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Digital Interface www.ti.com
The input pins on the ADS1281EVM are directly connected to the part, with no filtering or protection. It is
important to take appropriate caution when handling the pins. Table 1 summarizes the pinouts for analog
interfaces J6.
Table 1. J6: Analog Interface Pinout
Pin Number Signal Description
J6.1 A1N AINN, ADS1281
J6.2 A1P AINP, ADS1281
J6.9-13 (odd) AGND Analog ground connections
J6.15 VCOM
J6.17-19 (odd) AGND Analog ground connections
J6.18 REFN External reference source input (–side of
differential input)
J6.20 REFP External reference source input (+ side of
differential input)
J6.3-8 Unused
J6.10-16 (even) Unused
3 Digital Interface
3.1 Serial Data Interface
The ADS1281EVM is designed to easily interface with 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 J5. This header/socket provides access to the digital control and serial data pins of the
ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options.
All logic levels on J5 are 3.3V CMOS, except for the I2C pins. These pins conform to 3.3V I2C™rules.
Table 2 describes the J5 serial interface pins.
Table 2. J5: Serial Interface Pins
Pin No. Pin Name Signal Name I/O Type Pull-Up Function
J5.1 CNTL Unused
J5.2 GPIO0 M0 In/Out Low Data rate select input /
Modulator data output
J5.3 CLKX SCLK In None ADS1281 SPI™clock
J5.4 DGND DGND In/Out None Digital ground
J5.5 CLKR Unused
J5.6 GPIO1 M1 In/Out High Data rate select input /
Modulator data output
J5.7 FSX Unused
J5.8 GPIO2 MCLK Out Low Modulator clock output
J5.9 FSR DRDY Out None Data ready signal
J5.10 DGND DGND In/Out None Digital ground
J5.11 DX MOD/DIN In None ADS1281 SPI data in
J5.12 GPIO3 SUPSOR In High Power-supply regulator
Hi = ±2.5V Lo = +5V
J5.13 DR DOUT Out None ADS1281 data out
J5.14 GPIO4 PDWN In High Power-down input
J5.15 INT DRDY Out None Data Ready signal
J5.16 SCL SCL I2C—I2C clock
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Table 2. J5: Serial Interface Pins (continued)
Pin No. Pin Name Signal Name I/O Type Pull-Up Function
J5.17 TOUT CLK In None Can be used to provide
a clock from a
processor
J5.18 DGND DGND In/Out None Digital ground
J5.19 GPIO5 EXTCLK In None External clock input
J5.20 SDA SDA I2C—I2C data
Many pins on J5 have weak pull-up/-down resistors. These resistors provide default settings for many of
the control pins. Additionally, many pins on J5 correspond directly to ADS1281 pins. See the ADS1281
product data sheet for complete details on these pins.
4 Power Supplies
J8 is the power-supply input connector. Table 3 lists the configuration details for J8. Analog inputs to the
ADC can be applied directly to the device (see Section 8.1,Analog Input). An additional bipolar supply is
needed to power the bipolar amplifiers. For optimum noise performance, the external supplies (+VA and
-VA) should be used.
Table 3. J3 Configuration: Power-Supply Input
Pin No. Pin Name Function Required
J8.1 +VA +10V to +15V Yes
J8.2 –VA –10V to –15V Yes
J8.3 +5VA +5V analog supply Always
J8.4 –5VA –5V analog supply No; only for bipolar mode
J8.5 DGND Digital ground input Yes
J8.6 AGND Analog ground input Yes
J8.7 +1.8VD 1.8V digital supply No
J8.8 VD1 Not used No
J8.9 +3.3VD 3.3V digital supply Always
J8.10 +5VD +5V No
4.1 Bipolar Power Options
The voltage used to power the op amps is +10V and –10V pins J8.1 and J8.2. If using bipolar mode, ±5V
supplies must be connected to pins J8.3 and J8.4. The ±5V is regulated down to ±2.5V with U10 and U13
in bipolar mode. Jumpers must be properly placed across J7.1 and J7.2 as well as J7.3 and J7.4 to
properly power the ADS1281 (shown in Figure 1).
Figure 1. Connectors for J7
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5 Voltage Reference
The ADS1281EVM has many options for supplying a reference voltage to the ADS1281. Jumper J1 can
select the voltage from the REF5050 (U1) or use ground. The REF5050 supplies 5.0V to the reference for
unipolar mode. If ground is selected, then the voltage reference becomes 2.5V in bipolar mode. This
configuration comes from the voltage difference across the VREFP and VREFN pins on the ADS1281.
The voltage is filtered and buffered by U3 before it is used as a reference for the ADS1281.
The ADS1281 can also be referenced by an external reference voltage using pins J6.18 (REF–) and J6.20
(REF+). Switch S1 chooses either the onboard reference or the external reference voltage that is
connected to the pins of J6. Figure 2 shows switch S1 as it appears on the EVM.
Figure 2. Switch S1
6 Power-Down, Mode and Format Control
The power-down functionality of the ADS1281 is controlled by GPIO4 (J5.14) on the EVM. The
ADS1281EVM-PDK uses the I2C port expander on the EVM to allow the software to control this pin.
7 Clock Source
The ADS1281 clock can come from one of two sources: the onboard 4.096MHz crystal oscillator, or a
clock supplied by a processor on the TOUT pin (J5.17).
7.1 Usage in PDK
If using the ADS1281EVM as part of the ADS1281EVM-PDK, the J3 jumper should be set to the DVDD
position. Using the onboard 4.096MHz crystal oscillator allows the the ADS1281EVM-PDK software to
recognize the EVM using the software provided.
7.2 Usage as a Stand-Alone EVM
If using the EVM within your own system and not with the PDK hardware and software, jumper J3 can be
used to select the clock. The jumper can be used to always select the 4.096MHz crystal (DVDD position)
or allow the onboard clock to be controlled by GPIO5 (J5.19), as shown in Figure 3. The P05 (U7.6) pin
allows the I2C interface to program a clock to GPIO5.
Figure 3. Jumper J3
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8 EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the ADS1281EVM.
8.1 Analog Input
A single-channel differential input source can be applied directly to J6 (top or bottom side) or through
several different signal-conditioning modules available for the modular EVM system. The input is
connected directly through an OPA1632 buffer before reaching the ADS1281. The common-mode voltage
(VCOM) for the input buffer op amps is 2.5V supplied from the REF5025.
8.2 Digital Control
The digital control signals can be applied directly to J5 (top or bottom side). The modular ADS1281EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface
EVM or HPA-MCU Interface boards available from Texas Instruments, or the MMB0 if purchased as part
of the ADS1281EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the
ADS1281, see the relevant product folder on the TI web site. Some of the digital signals are controlled
directly with pins on J5. Other signals, such as SYNC, MFLAG, PMODE, and RESET controls, can only
be controlled by U7. These signals are configured and read using the I2C signals on pins 16 and 20 of J5.
The Format and Mode pins can be controlled by both methods (GPIO pins on J5, and the I2C control from
U7).
8.3 Default Jumper Settings and Switch Positions
Figure 4 shows the jumpers found on the EVM and the respective factory default conditions for each.
Figure 4. ADS1281EVM Default Jumper Locations
There is only one switch, S1, located on the ADS1281EVM; it is used to set VREF. The default position is
to the left, indicating the EVM is to use the onboard reference voltage.
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9 ADS1281EVM-PDK Kit Operation
This section provides information on using the ADS1281EVM-PDK, including setup, program installation,
and program usage.
To prepare to evaluate the ADS1281 with the ADS1281EVM-PDK, complete the following steps:
Step 1. Install the ADCPro software (if not already installed) on a PC.
Step 2. Install the ADS1281EVM-PDK EVM plug-in software.
Step 3. Set up the ADS1281EVM-PDK.
Step 4. Connect a proper power supply or use the included ac adapter.
Step 5. Complete the NI-VISA™USB driver installation process.
Step 6. Run the ADCPro software.
Step 7. Complete the Microsoft Windows USB driver installation process.
Each task is described in the subsequent sections of this document.
9.1 Installing the ADCPro Software
CAUTION
Do not connect the ADS1281EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS1281EVM-PDK as an connected device.
The latest software is available from the TI website at http://www.ti.com/. The CD-ROM shipped with the
ADS1281EVM may not contain the latest software. The updated ADCPro software can be downloaded
directly from the TI web site (http://www.ti.com/adcpro) or the update check command can be used. Refer
to the ADCPro User Guide for instructions on installing and using ADCPro.
To install the ADS1281EVM-PDK plug-in, run the file: ads1281evm-pdk-plugin-1.0.0.exe (1.0.0 is the
version number, and increments with software version releases; you may have a different version on the
CD). Double-click the file to run it; then follow the instructions shown. You can also utilize the ADCPro
Update Check feature to check for newer versions of the ADS1281EVM-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 PC
operating system. This step will complete when the ADCPro software is executed; see Section 10,
Running the Software and Completing Driver Installation.
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9.2 Setting Up the ADS1281EVM-PDK
The ADS1281EVM-PDK contains both the ADS1281EVM and the MMB0 motherboard; however, the
devices are shipped unconnected. Follow these steps to set up the ADS1281EVM-PDK.
Step 1. Unpack the ADS1281EVM-PDK kit.
Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 5.
•Set the Boot Mode switch to USB.
•Set jumper J4 low to indicate that the EVM board is a ADS1281EVM.
Figure 5. MMB0 Initial Setup
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3. Plug the ADS1281EVM into the MMB0 as Figure 6 illustrates.
Figure 6. Connecting ADS1281EVM to MMB0
CAUTION
Do not misalign the pins when plugging the ADS1281EVM into the MMB0.
Check the pin alignment carefully before applying power to the PDK.
9.2.1 About the MMB0
The MMB0 is a Modular EVM System motherboard. It is designed around the TMS320VC5507, a DSP
with an onboard USB interface from Texas Instruments. The MMB0 also has 16MB of SDRAM installed.
The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offer
support 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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J13
POWER
SUPPLY
CONFIG
J12
WALL SUPPLY CONNECTION
J2
AC ADAPTER INPUT
J14
POWER
INPUT +10V
-10V
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9.3 Connecting the Power Supply
The ADS1281EVM-PDK requires both a +5V supply and a external supply (±10V to ±15V) to operate. The
+5V supply can be provided by either the +6V wall supply (included with the EVM-PDK) or an additional
external supply.
When the MMB0 DSP is powered properly, LED D2 glows green. The green light indicates that the 3.3V
supply for the MMB0 is operating properly. (It does not indicate that the EVM power supplies are
operating properly.)
9.3.1 Using the +6V Wall Supply for +5V
An ac wall supply can be connected to barrel jack J2 on the MMB0 to supply the +5V required for
operation. J2 is located next to the USB connector. The wall supply must output 6V to 7V dc. The
connector must be sleeve-negative, tip-positive. It should have a current rating of at least 2A. The wall
supply included in the EVM-PDK will provide the necessary voltage and current to the EVM.
Jumper J12 on the MMB0 connects a wall-mounted power supply to the board. To use the wall-mount
supply, J12 must be shorted. Figure 7 illustrates how to connect an ac adapter to the MMB0.
Figure 7. Using the +6V Wall Supply for +5V
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J13
POWER
SUPPLY
CONFIG
J14
POWER
INPUT
J12
WALL SUPPLY DISCONNECT
GND
+5VDC
(OPTIONAL) 5VDC-
+10V
-10V
ADS1281EVM-PDK Kit Operation www.ti.com
9.3.2 Using a External Supply For +5V
A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in
Figure 8, to provide the +5V required for operation.
To use a lab power supply for +5V:
•Disconnect J12 on the MMB0. This disconnect the barrel jack, J2, from powering the +5V supply.
•Connect a +5V dc supply to the +5VA and GND terminals on J14.
•Make sure that the external supply can source 2A of current to the board.
Figure 8. Using a External Supply For +5V
9.3.3 Connecting the External Bipolar Supplies
A external supply of ±10V is required for proper operation of the EVM. These supplies can be connected
to the terminal block J14 on the MMB0.
Connect the –10V dc supply to –VA, and +10V dc to +VA terminals on J14.
9.3.4 Power For Bipolar Mode versus Unipolar Mode
The ADS1252EVM allows for operation of the device in either unipolar or bipolar mode. Depending on the
mode, the power supply requirements can differ.
For operation in unipolar mode, no additional supplies are required other than those specified in
Section 9.3.1 to Section 9.3.3.
For operation in bipolar mode, an additional -5V supply is required. Connect at –5V supply to –5VA
terminal of J14. It is not necessary to connect a +5V dc supply voltage to the +5VA terminal on J14 if the
+5V/+5VA position on J13 is shorted.
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10 Running the Software and Completing Driver Installation
NOTE: The software is continually under development. These instructions and screen images are
current at the time of this writing, but may not exactly match future releases.
The program for evaluating the ADS1281EVM-PDK is called ADCPro. This program uses a series of
software plug-ins to communicate with the EVM. The ADS1281EVM-PDK plug-in is included in the
ADS1281EVM-PDK package.
The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista is NOT
supported.
If this is the first time to install ADCPro and the plug-ins, follow these procedures to run ADCPro and
complete the necessary driver installation. Make sure the ADCPro software and device plug-in software
are installed from the CD-ROM as described in Section 9.1,Installing the ADCPro Software.
10.1 NI-VISA USB Device Driver Installation
1. After the ADCPro software is installed, apply power to the PDK and connect the board to an available
PC USB port.
2. The computer should recognize new hardware and begin installing the drivers for the hardware.
Figure 9 through Figure 12 are provided for reference to show the installation steps.
•For the first screen, Figure 9, it is not necessary to search for the software; it has already been
installed to your PC.
•For the remaining steps, accept the default settings.
Figure 9. NI-VISA Driver Installation
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Figure 10. NI-VISA Driver Installation Question
Figure 11. NI-VISA Driver Installing
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Figure 12. NI-VISA Driver Complete Installation
This process should complete the installation of the NI-VISA drivers. You can verify proper installation by
opening the Device Manager and locating the hardware as shown in Figure 13.
Figure 13. NI-VISA Driver Verification Using Device Manager
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10.2 USBStyx Driver Installation
Step 1. Start the software by selecting ADCPro from the Windows Start menu. The screen in
Figure 14 appears.
Figure 14. ADCPro Software Start-up Display Window
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www.ti.com Running the Software and Completing Driver Installation
2. Select ADS1281EVM from the EVM drop-down menu. The ADS1281EVM-PDK plugin appears in the
left pane, as shown in Figure 15.
Figure 15. ADS1281EVM-PDK Plug-In Display Window
Step 2. The ADS1281EVM-PDK plug-in window has a status area at the top of the screen. When the
plug-in is first loaded, the plug-in searches for the board. You will see a series of messages
in the status area indicating this action.
Step 3. If you have not yet loaded the operating system drivers, Windows will display the Windows
Install New Driver Wizard sequence (illustrated in Figure 16 through Figure 20). Accept the
default settings.
NOTE: During the driver installation, a message may appear indicating the firmware load has timed
out. Click OK and continue driver installation. The plug-in will attempt to download the
firmware again once the driver installation completes.
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Figure 16. Install New Driver Wizard Screen 1
Figure 17. Install New Driver Wizard Screen 2
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Figure 18. Install New Driver Wizard Screen 3
Figure 19. Install New Driver Wizard Screen 4
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Figure 20. Install New Driver Wizard Screen 5
Step 4. Once Windows finishes installing the software driver, the plug-in downloads the firmware to
the MMB0. The status area will display Connected to EVM when the device is connected and
ready to use. If the firmware does not load properly, you can try resetting the MMB0 by
pressing Reset and then reloading the plug-in.
Step 5. You can verify the proper installation of the USBStyx driver using the Device Manager. Note
that the first driver item, NI-VISA USB Devices, will disappear and a new item,
LibUSB-Win32 Devices will appear, as Figure 21 shows.
Figure 21. USBStyx Driver Verification Using Device Manager
The driver installation wizard sequence should not appear again, unless you connect the board to a
different USB port.
11 Evaluating Performance with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The
ADS1281EVM plug-in is installed as described in the installation section, Section 10.)
To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM
menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option
from the corresponding menu.
Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous
plug-in is unloaded.
20 ADS1281EVM and ADS1281EVM-PDK User's Guide SBAU143C–March 2009–Revised May 2011
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