Texas Instruments ADS79 EVM-PDK Series User manual

User's Guide
SLAU262C–January 2009–Revised May 2011
ADS79xxEVM and ADS79xxEVM-PDK
Figure 1. ADS7953EVM (Left) and ADS7953EVM-PDK (Right)
This users guide describes the characteristics, operation, and use of the ADS7953EVM, ADS7957EVM
and ADS7961EVM, both by themselves and as part of the ADS7953EVM-PDK, ADS7957EVM-PDK or
ADS7961EVM-PDK. These evaluation modules (EVMs) are evaluation boards for the ADS7953, a 12-bit,
16-channel, successive approximation register (SAR) analog-to-digital converter (ADC), and the ADS7957
and ADS7961, which are 10-bit and 8-bit variations of the ADS7953. The EVM allows evaluation of all
aspects of the ADS7953, ADS7957 or ADS7961 device. Complete circuit descriptions, schematic
diagrams, and bills of material are included in this document.
The following related documents are available through the Texas Instruments website at http://www.ti.com.
ADCPro is a trademark of Texas Instruments.
Microsoft, Windows XP are registered trademarks of Microsoft Corporation.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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Contents
1 EVM Overview ............................................................................................................... 3
2 Analog Interface ............................................................................................................. 4
3 Digital Interface .............................................................................................................. 5
4 Power Supplies .............................................................................................................. 6
5 Voltage Reference .......................................................................................................... 6
6 EVM Operation .............................................................................................................. 6
7 ADS7953EVM-PDK Kit Operation ........................................................................................ 8
8 Evaluating Performance with the ADCPro Software .................................................................. 19
9 Schematic and Bill of Materials .......................................................................................... 26
List of Figures
1 ADS7953EVM (Left) and ADS7953EVM-PDK (Right) ................................................................. 1
2 ADS7953EVM Default Jumper Locations................................................................................ 7
3 MMB0 Initial Setup ......................................................................................................... 9
4 Connecting an AC Adapter............................................................................................... 10
5 Laboratory Power-Supply Connection.................................................................................. 11
6 NI-VISA Driver Installation ............................................................................................... 12
7 NI-VISA Driver Installation Question ................................................................................... 12
8 NI-VISA Driver Installing ................................................................................................. 13
9 NI-VISA Driver Complete Installation .................................................................................. 13
10 NI-VISA Driver Verification Using Device Manager .................................................................. 14
11 ADCPro Software Start-up Display Window ........................................................................... 14
12 ADS7953EVM-PDK Plug-In Display Window.......................................................................... 15
13 Install New Driver Wizard Screen 1..................................................................................... 16
14 Install New Driver Wizard Screen 2..................................................................................... 16
15 Install New Driver Wizard Screen 3..................................................................................... 17
16 Install New Driver Wizard Screen 4..................................................................................... 17
17 Install New Driver Wizard Screen 5..................................................................................... 18
18 USBSytx Driver Verification Using Device Manager ................................................................. 18
19 Channel Enable............................................................................................................ 20
20 Manual Channel Control.................................................................................................. 21
21 Serial Clock, Input Range and MS Nibble settings ................................................................... 22
22 High and Low Alarm Limits by Channel ................................................................................ 23
23 GPIO and System Monitor Control options ............................................................................ 24
24 GPIO selection, controls and indicators................................................................................ 25
25 Progress Bar While Collecting Data .................................................................................... 26
26 ADS7953EVM Schematic ................................................................................................ 27
List of Tables
1 EVM-Compatible Device Data Sheets ................................................................................... 3
2 Primary Analog Interface Pinout .......................................................................................... 4
3 Secondary Analog Interface Pinout....................................................................................... 4
4 Serial Interface Pins ........................................................................................................ 5
5 P3 Configuration: Power-Supply Input ................................................................................... 6
6 List of Jumpers.............................................................................................................. 7
7 ADS7953EVM Bill of Materials .......................................................................................... 28
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1 EVM Overview
Table 1. EVM-Compatible Device Data Sheets
Device Literature Number
ADS7953, ADS7952, ADS7951, ADS7950, ADS7957, ADS7956, SLAS605
ADS7955, ADS7954, ADS7961, ADS7960, ADS7959, ADS7958
OPA365 SBOS365
REF5025 SBOS410
1.1 Features
ADS7953EVM/ADS7957EVM/ADS7961 EVM Features:
•Contains all support circuitry needed for the ADS7953/ADS7957/ADS7961
•Voltage reference options: external or onboard
•Buffer options: onboard analog input buffer can be bypassed
•GPIO access with HI or LO alarm options to interrupt host processor
•Compatible with the TI Modular EVM System
ADS7953EVM/ADS7957EVM/ADS7961EVM-PDK Features:
•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 ADS79xxEVM Performance Demonstration Kit (PDK) is available. This kit
combines the ADS7953EVM, ADS7957EVM or ADS7961EVM board with the TMS320VC5507
DSP-based MMB0 motherboard, and includes ADCPro™software for evaluation.
The MMB0 motherboard allows the ADS79xxEVM to be connected to the computer via an available USB
port. This manual shows how to use the MMB0 as part of the ADS79xxEVM-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 ADS79xxEVM-PDK is controlled by a plugin running in ADCPro. For more information about ADCPro,
see the ADCPro Analog-to-Digital Converter Evalutation Software Users Guide, available for download
from the TI website.
This manual covers the operation of all three ADS7953, ADS7957 and ADS7961 devices refered to as the
ADS79xxEVM and the ADS79xxEVM-PDK. Throughout this document, the abbreviation EVM and the term
evaluation module are synonymous with the ADS79xxEVM. For clarity of reading, the rest of this manual
will refer only to the ADS7953EVM or ADS7953EVM-PDK. The individual kit contains one ADS7953EVM,
ADS7957EVM or ADS7961EVM, but operation of the EVM and kit for the ADS7957 or ADS7961 is
identical, unless otherwise noted.
1.2 Introduction
The ADS7953EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any of the modular EVM system interface cards available from Texas Instruments.
The ADS7953EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS7953EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the
ADS7953EVM is useful for prototyping designs and firmware.
Note that the ADS7953EVM has no microprocessor and cannot run software. To connect it to a computer,
some type of host processor interface capable of generating the necessary control signals is required.
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2 Analog Interface
For maximum flexibility, the ADS7953EVM 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 P1. This header/socket provides access to the analog input pins
associated with CH0-CH7 of the ADS7953. Consult Samtec at http://www.samtec.com or call
1-800-SAMTEC-9 for a variety of mating connector options. Samtec part number TMS-108-02-G-D
provides access to analog input channels CH8-CH15 at J1.
Most of the pins on P1 and J1 are directly connected to the ADS7953 using a simple R/C filter with no
additional overvoltage protection circuitry. Use appropriate caution when handling these pins. Table 2 and
Table 3 summarize the pinouts for analog interfaces P1 and J1, respectively.
Table 2. Primary Analog Interface Pinout
Pin Number Signal Description
P1.2 CH7 CH7 input
P1.4 CH6 CH6 input
P1.6 CH5 CH5 input
P1.8 CH4 CH4 input
P1.10 CH3 CH3 input
P1.12 CH2 CH2 input
P1.14 CH1 CH1 input
P1.16 CH0 CH0 input
External reference source input (–side of
P1.18 EXTREFN differential input)
External reference source input (+ side of
P1.20 EXTREFP differential input)
J9.15 Unused —
P1.1-19 (odd) AGND Analog ground connections (except J1.15)
Table 3. Secondary Analog Interface Pinout
Pin Number Signal Description
J1.2 CH15 CH15 input
J1.4 CH14 CH14 input
J1.6 CH13 CH13 input
J1.8 CH12 CH12 input
J1.10 CH11 CH11 input
J1.12 CH10 CH10 input
J1.14 CH9 CH9 input
J1.16 CH8 CH8 input
J1.1-15 (odd) AGND Analog ground connections
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3 Digital Interface
3.1 Serial Data Interface
The ADS7953EVM 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 P2. 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.
Table 4 describes the P2 serial interface pins.
Table 4. Serial Interface Pins
Pin No. Pin Name Signal Name I/O Type Pullup Function
P2.1 CNTL CS In None Controls CS input, Jumper
option with P2.7 via W5
P2.2 GPIO0 GPIO2 In/Out High GPIO
P2.3 CLKX SCLK In None ADS79xx serial clock
P2.4 DGND DGND NA None Digital Ground
P2.5 CLKR CLKR Out None serial clock return to DSP
P2.6 GPIO1 GPIO3 In/Out High GPIO
P2.7 FSX FSYNC Xmit In None Controls CS input, Jumper
option with P2.1 via W5
P2.8 GPIO2 Unused NA NA
P2.9 FSR FSYNC rtrn Out None
P2.10 DGND DGND NA None Digital Ground
P2.11 DX DIN In None ADS79xx SPI data in
P2.12 GPIO3 Unused NA NA
P2.13 DR DOUT Out None ADS79xx data out
P2.14 GPIO4 Unused NA NA
P2.15 /INT GPIO0/GPIO1 Out None Hi/Lo Alarm Interrupt options
P2.16 SCL SCL I2C™n/a I2C clock
P2.17 TOUT Unused NA NA
P2.18 DGND DGND NA None Digital Ground
P2.19 GPIO5 Unused NA NA
P2.20 SDA SDA I2C n/a I2C data
3.2 Data Output
All output data communications are directed through DOUT. The data from all 16 channels can be
observed on the DOUT pin. This is the signal that is used by the ADS7953EVM-PDK to read back and
display all the channel data via the ADCPro software.
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4 Power Supplies
P3 is the power-supply input connector. Table 5 lists the configuration details for P3. Only +5V analog and
+5V digital is required to power the EVM. If desired, a jumper option (W6) is provided to supply the
ADS7953 digital core with +3.3V.
Table 5. P3 Configuration: Power-Supply Input
Pin No. Pin Name Function Required
J3.1 +VA +10V to +15V No
J3.2 –VA –10V to –15V No
J3.3 +5VA +5V analog supply Always
J3.4 –5VA –5V analog supply No
J3.5 DGND Digital ground input Yes
J3.6 AGND Analog ground input Yes
J3.7 +1.8VD 1.8V digital supply No
J3.8 VD1 Not used No
J3.9 +3.3VD 3.3V digital supply Yes, if +5VD is not used
J3.10 +5VD +5V Yes, if +3.3VD is not used
The ADS7953 digital section can be powered from +3.3V or +5V by means of jumper option W6.
5 Voltage Reference
The ADS7953EVM has three sources for the reference voltage. Jumper W2 can select the REFP voltage
from either the REF5025(U3) or from an external source applied to P1.18. Jumper W3 can select the
REFM voltage from either the analog ground (AGND) or from an external source applied to P1.20.
6 EVM Operation
The following section provides information on the analog input, digital control, and general operating
conditions of the ADS7953EVM.
6.1 Analog Input
Eight of the analog input sources (channels 0-7) can be applied directly to P1 (top or bottom side) or
through signal-conditioning modules available for the modular EVM system. The additional eight channel
sources (CH8-CH15) can be applied to connector J1. The analog input range on the EVM is identical to
that of the installed device and is dependent on the RANGE setting of the ADC (0 to 5V or 0 to 2.5V)
Each input signal can be configured to connect directly to the analog inputs of the ADS7953 through a
33Ωseries resistor with an 0.027pF capacitor to AGND. The input to CH0 can use the OPA365 buffer that
is provided (default condition, W4 jumpered pins 1-2). Jumper W4 can be placed on pins 2-3 to bypass
the unity gain buffer configuration of the OPA365.
6.2 Digital Control
The digital control signals can be applied directly to P5 (top or bottom side). The modular ADS7953EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6KInterface or
HPA-MCUInterface boards available from Texas Instruments. When purchased as part of a PDK, the
ADS7953EVM can be controlled by the MMB0. For a list of compatible interface and/or accessory boards
for the EVM or the ADS7953, see the relevant product folder on the TI website. All of the digital signals
are controlled directly with pins on P2.
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6.3 ADS7953EVM-PDK Power Supply
The analog portion of the ADS7953EVM can either be powered by a 5V source generated via ac adapter
or by applying the +5VA to the connector on the MMB0 board. The MMB0 board will provide the digital 5V
and 3.3V to the ADS7953EVM. To provide +5VA to the ADS7953EVM from the MMB0 board, make sure
the jumper at J13 (on the MMB0) is closed from +5V to +5VA.
6.4 Default Jumper Settings
Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each.
Figure 2. ADS7953EVM Default Jumper Locations
Table 6 lists the jumpers found on the EVM and the respective factory default conditions for each.
Table 6. List of Jumpers
Switch Default Position Switch Description
W1 Open W1 is not installed in production boards
W2 selects the REFP source, onboard (default) or external via
W2 Short 1-2 P1.18
W3 selects the REFM source, AGND (default) or external via
W3 Short 1-2 P1.20
W4 selects the CH0 input configuration, buffered (default) or
W4 Short 1-2 bypassed
W5 selects the CS source on the ADS7953, FSX (default) or
W5 Short 1-2 CNTL
W6 Short 1-2 W6 selects the DVDD Voltage, +5VD (default) or +3.3VD
W7 selects the host processor interrupt source, GPIO1 (default)
W7 Short 1-2 or GPIO0
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7 ADS7953EVM-PDK Kit Operation
This section provides information on using the ADS7953EVM-PDK, including setup, program installation,
and program usage.
To prepare to evaluate the ADS7953 with the ADS7953EVM-PDK, complete the following steps:
Step 1. Install the ADCPro software (if not already installed) on a PC.
Step 2. Install the ADS7953EVM-PDK EVM plug-in software.
Step 3. Set up the ADS7953EVM-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.
7.1 Installing the ADCPro Software
CAUTION
Do not connect the ADS7953EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS7953EVM-PDK.
The latest software is available from the TI website at http://www.ti.com/. The ADCPro installer will check
for updates when executed (if connected to the Internet), and then gives the option of downloading and
installing the latest version. See the ADCPro Analog-to-Digital Converter Evalutation Software Users
Guide for instructions on installing and using ADCPro.
To install the ADS7953EVM-PDK plug-in, run the file: ads7953evm-pdk-plugin-1.1.0.exe (1.1.0 is the
version number, and increments with software version releases). Double-click the file to run it; then follow
the instructions shown. Also, use the ADCPro Update Check feature to check for newer versions of the
ADS7953EVM-PDK plug-in, once one version has been installed.
The software should now be installed, but the USB drivers may not have been loaded by the PC operating
system. This step will complete when the ADCPro software is executed.
7.2 Setting Up the ADS7953EVM-PDK
The ADS7953EVM-PDK contains both the ADS7953EVM and the MMB0 motherboard; however, the
devices are shipped unconnected. Follow these steps to set up the ADS7953EVM-PDK:
Step 1. Unpack the ADS7953EVM-PDK kit.
Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 3.
•Set the Boot Mode switch to USB.
•Connect +5V and +5VA on jumper block J13 (if +5V is supplied from J14 +5VA).
•Leave +5V and +VA disconnected on jumper block J13.
•If the PDK will be powered from an ac adapter, connect J12. If the PDK will be powered through the
terminal block, disconnect J12 (see Section 7.3 of this document for additional power supply
connection details).
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Figure 3. MMB0 Initial Setup
Step 3. Plug the ADS7953EVM into the MMB0. The female portion of P1, P2 and P3 on the EVM align
with male connectors J7, J4 and J5 respective on the MMB0.
CAUTION Do not misalign the pins when plugging the ADS7953EVM into the MMB0. Check the pin
alignment of P1, P2, and P3 carefully before applying power to the PDK.
Step 4. Verify the jumpers on the ADS7953EVM are as shown in Figure 2 (note that these settings are the
factory-configured settings for the EVM).
7.2.1 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 intended to be used as a DSP development board, and it is not available separately. TI
cannot offer support for the MMB0 except as part of an EVM-PDK kit. For schematics or other information
about the MMB0, contact Texas Instruments.
7.3 Connecting the Power Supply
The ADS7953EVM-PDK can be operated with a unipolar +5V supply or a combination of +5V and +3.3V
supplies.
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.)
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7.3.1 Connecting an AC Adapter
An ac adapter can be connected to barrel jack J2 on the MMB0. J2 is located next to the USB connector.
The adapter must output 6V-7V dc. The connector must be sleeve-negative, tip-positive. It should have a
current rating of at least 2A.
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 4 illustrates how to connect an ac adapter to the MMB0.
Figure 4. Connecting an AC Adapter
7.3.2 Connecting a Laboratory Power Supply
A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in
Figure 5.
To use a unipolar lab power supply configuration:
•Disconnect J12 on the MMB0.
•Connect a +5V dc supply to the +5VD terminal on J14.
•Connect ground of the dc supply to the GND terminal on 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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Figure 5. Laboratory Power-Supply Connection
7.4 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 ADS7953EVM-PDK is called ADCPro. This program uses plug-ins to
communicate with the EVM. The ADS7953EVM-PDK plug-in is included in the ADS7953EVM-PDK
package.
The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista is NOT
supported at the time of this writing.
If this is the first time installing ADCPro and the EVM plug-ins, follow these procedures to run ADCPro and
complete the necessary driver installation.
7.4.1 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 6 through Figure 10 are provided for reference to show the installation steps.
•For the first screen, Figure 6, it is not necessary to search for the software; it has already been
installed to the PC.
•For the remaining steps, accept the default settings.
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Figure 6. NI-VISA Driver Installation
Figure 7. NI-VISA Driver Installation Question
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Figure 8. NI-VISA Driver Installing
Figure 9. NI-VISA Driver Complete Installation
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This procedure should complete the installation of the NI-VISA drivers. Verify the proper installation by
opening the Device Manager and locating as shown in Figure 10.
Figure 10. NI-VISA Driver Verification Using Device Manager
Once ADCPro is installed, install the ADS7953EVM-PDK software to allow ADCPro to recognize the
evaluation board.
7.4.2 USBStyx Driver Installation
Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 11 appears.
Figure 11. ADCPro Software Start-up Display Window
1. Select ADS7953EVM from the EVM drop-down menu. The ADS7953EVM-PDK plugin appears in the
left pane, as shown in Figure 12.
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Figure 12. ADS7953EVM-PDK Plug-In Display Window
2. The ADS7953EVM-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. The user will see a series of messages in the status
area indicating this action.
3. If the operating system drivers have not been loaded, Windows will display the Windows Install New
Driver Wizard sequence (illustrated in Figure 13 through Figure 17). 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 13. Install New Driver Wizard Screen 1
Figure 14. Install New Driver Wizard Screen 2
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Figure 15. Install New Driver Wizard Screen 3
Figure 16. Install New Driver Wizard Screen 4
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Figure 17. Install New Driver Wizard Screen 5
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, try resetting the MMB0 by pressing reset and then reloading the
plug-in.
5. 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 18 shows.
Figure 18. USBSytx Driver Verification Using Device Manager
The driver installation wizard sequence should not appear again, unless the board is connected to a
different USB port.
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8 Evaluating Performance with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The
ADS7953EVM plug-in is installed as described in the previous section.)
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 selecting a different plugin, the previous plugin
is unloaded.
8.1 Using the ADS7953EVM-PDK Plug-in
The ADS7953EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS7953. It
consists of a tabbed interface (see Figure 19), with different functions available on different tabs. These
controls are described in this section.
The user can adjust the ADS7953EVM settings when not acquiring data. During acquisition, all controls
are disabled and settings may not be changed.
When a setting is changed on the ADS7953EVM plug-in, the setting immediately updates on the board.
Settings on the ADS7953EVM correspond to settings described in the ADS7953 product data sheet; see
the ADS7953 data sheet for details.
Because the effective sampling rate of the ADS7953 depends upon settings of the Clock Freq and the
number of channels being sampled, the Sampling Rate indicator in the upper right corner of the plug-in
interface is always visible and updates whenever a setting changes that affects the effective 'per-channel'
sampling rate.
19
SLAU262C–January 2009–Revised May 2011 ADS79xxEVM and ADS79xxEVM-PDK
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8.1.1 Channel Tab
The ADS7953 can acquire from one to sixteen channels sequentially or in a user defined pattern. The
Channel Tab (as shown in Figure 19) provides the control to turn each channel on or off. By default,
manual channel mode is enabled. In manual mode, any single channel may be selected for conversion.
Figure 19. Channel Enable
20 ADS79xxEVM and ADS79xxEVM-PDK SLAU262C–January 2009–Revised May 2011
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Copyright ©2009–2011, Texas Instruments Incorporated