TI1 OPA365AID Contains all support circuitry needed Datasheet

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
EVM Overview ............................................................................................................... 3
Analog Interface ............................................................................................................. 4
Digital Interface .............................................................................................................. 5
Power Supplies .............................................................................................................. 6
Voltage Reference .......................................................................................................... 6
EVM Operation .............................................................................................................. 6
ADS7953EVM-PDK Kit Operation ........................................................................................ 8
Evaluating Performance with the ADCPro Software .................................................................. 19
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
4
Connecting an AC Adapter ............................................................................................... 10
5
Laboratory Power-Supply Connection .................................................................................. 11
6
NI-VISA Driver Installation
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9
10
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12
13
14
15
16
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25
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NI-VISA Driver Installation Question ...................................................................................
NI-VISA Driver Installing .................................................................................................
NI-VISA Driver Complete Installation ..................................................................................
NI-VISA Driver Verification Using Device Manager ..................................................................
ADCPro Software Start-up Display Window ...........................................................................
ADS7953EVM-PDK Plug-In Display Window ..........................................................................
Install New Driver Wizard Screen 1 .....................................................................................
Install New Driver Wizard Screen 2 .....................................................................................
Install New Driver Wizard Screen 3 .....................................................................................
Install New Driver Wizard Screen 4 .....................................................................................
Install New Driver Wizard Screen 5 .....................................................................................
USBSytx Driver Verification Using Device Manager .................................................................
Channel Enable ............................................................................................................
Manual Channel Control ..................................................................................................
Serial Clock, Input Range and MS Nibble settings ...................................................................
High and Low Alarm Limits by Channel ................................................................................
GPIO and System Monitor Control options ............................................................................
GPIO selection, controls and indicators ................................................................................
Progress Bar While Collecting Data ....................................................................................
ADS7953EVM Schematic ................................................................................................
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List of Tables
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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
ADS79xxEVM and ADS79xxEVM-PDK
..........................................................................................
28
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EVM Overview
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EVM Overview
Table 1. EVM-Compatible Device Data Sheets
1.1
Device
Literature Number
ADS7953, ADS7952, ADS7951, ADS7950, ADS7957, ADS7956,
ADS7955, ADS7954, ADS7961, ADS7960, ADS7959, ADS7958
SLAS605
OPA365
SBOS365
REF5025
SBOS410
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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Analog Interface
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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
P1.2
CH7
CH7 input
Description
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
P1.18
EXTREFN
External reference source input (– side of
differential input)
P1.20
EXTREFP
External reference source input (+ side of
differential input)
J9.15
Unused
—
P1.1-19 (odd)
AGND
Analog ground connections (except J1.15)
Table 3. Secondary Analog Interface Pinout
4
Pin Number
Signal
J1.2
CH15
CH15 input
Description
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
ADS79xxEVM and ADS79xxEVM-PDK
Analog ground connections
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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
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
P2.14
GPIO4
Unused
NA
NA
P2.15
/INT
GPIO0/GPIO1
Out
None
2
SCL
SCL
IC™
P2.17
TOUT
Unused
NA
NA
P2.18
DGND
DGND
NA
None
P2.19
GPIO5
Unused
NA
NA
P2.20
SDA
SDA
I2C
n/a
P2.16
3.2
Function
n/a
ADS79xx data out
Hi/Lo Alarm Interrupt options
I2C clock
Digital Ground
I2C data
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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Power Supplies
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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
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
Not used
No
3.3V digital supply
Yes, if +5VD is not used
+5V
Yes, if +3.3VD is not used
J3.8
VD1
J3.9
+3.3VD
J3.10
+5VD
Function
Required
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
33Ω series 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
W1
Open
Switch Description
W2
Short 1-2
W2 selects the REFP source, onboard (default) or external via
P1.18
W3
Short 1-2
W3 selects the REFM source, AGND (default) or external via
P1.20
W4
Short 1-2
W4 selects the CH0 input configuration, buffered (default) or
bypassed
W5
Short 1-2
W5 selects the CS source on the ADS7953, FSX (default) or
CNTL
W6
Short 1-2
W6 selects the DVDD Voltage, +5VD (default) or +3.3VD
W7
Short 1-2
W7 selects the host processor interrupt source, GPIO1 (default)
or GPIO0
W1 is not installed in production boards
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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
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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.
14
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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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ADS79xxEVM and ADS79xxEVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
17
ADS7953EVM-PDK Kit Operation
www.ti.com
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.
18
ADS79xxEVM and ADS79xxEVM-PDK
SLAU262C – January 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
Evaluating Performance with the ADCPro Software
www.ti.com
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.
SLAU262C – January 2009 – Revised May 2011
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ADS79xxEVM and ADS79xxEVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
19
Evaluating Performance with the ADCPro Software
8.1.1
www.ti.com
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
Evaluating Performance with the ADCPro Software
www.ti.com
In addition, the Manual Control button (shown in Figure 20) can be used to enable or disable auto scan
modes 1 and 2. Auto 1 Mode allows the selection of any number of channels from the channel selection
list. Auto 2 Mode allows the selection of the highest channel to convert. All channels below this will be
converted once this selection is made by pressing the 'Accept Selection' button.
Figure 20. Manual Channel Control
SLAU262C – January 2009 – Revised May 2011
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ADS79xxEVM and ADS79xxEVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
21
Evaluating Performance with the ADCPro Software
8.1.2
www.ti.com
Other Tab
The ADS7953 requires a clock to operate. The maximum frequency is selected by default for the different
operating modes, providing the maximum 1MSPS throughput rate specified in the datasheet.
The clock setting can be modified in this tab by accepting the default SPI or clock stop mode, a
continuous clock mode with the fastest possible serial clock, or a continuous clock mode with a variable
frequency.
The analog input range can also be specified in this tab as well as the contents of the four MSBs of
channel data (GPIO status or Channel Address of the conversion results).
Figure 21. Serial Clock, Input Range and MS Nibble settings
22
ADS79xxEVM and ADS79xxEVM-PDK
SLAU262C – January 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
www.ti.com
8.1.3
Alarm Tab
The ADS7953 offers configurable alarm outputs for both high and low alarm selections. The configuration
of the alarm function takes place in two steps, the first of which is the setting of the alarm limits. In the
Alarm Tab, the hex values for high and low limits are entered for each channel requiring the alarm
function. To enable the alarm functions, the GPIO Function tab must be considered next.
Figure 22. High and Low Alarm Limits by Channel
SLAU262C – January 2009 – Revised May 2011
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ADS79xxEVM and ADS79xxEVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
23
Evaluating Performance with the ADCPro Software
8.1.4
www.ti.com
GPIO Function Tab
The GPIO0, GPIO1, GPIO2 and GPIO3 pins on the ADS7953 can function as simple general purpose
inputs/outputs or as specialized control and monitor functions. The alarm function described in the
previous section is processed by GPIO0 and GPIO1. Refer to the data sheet for specific details on GPIO0
and GPIO1 options. GPIO2 can be used to configure the input range of the ADS7953 (2.5V max or 5.0V
max), and GPIO3 can be used as a power down input pin.
Figure 23. GPIO and System Monitor Control options
24
ADS79xxEVM and ADS79xxEVM-PDK
SLAU262C – January 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
Evaluating Performance with the ADCPro Software
www.ti.com
8.1.5
GPIO Tab
The GPIO Tab provides a means to monitor and control GPIO functions. If a GPIO is selected in the GPIO
Function tab to perform a specialized function, it will appear 'grayed out' in the GPIO tab. For pins
configured as GP outputs, a push button will enable the user to set the desired output state. GP Inputs are
monitored with an LED display (bright green = logic high).
Figure 24. GPIO selection, controls and indicators
SLAU262C – January 2009 – Revised May 2011
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ADS79xxEVM and ADS79xxEVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
25
Schematic and Bill of Materials
8.1.6
www.ti.com
Collecting Data
Once the user has configured the ADS7953 for the test scenario, press the ADCPro Acquire button to
start the collection of the number of datapoints specified in the Test plug-in Block Size control. The
ADS7953EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress
bar as shown in Figure 25.
Figure 25. Progress Bar While Collecting Data
For more information on testing analog-to-digital converters in general and using ADCPro and Test
plug-ins, refer to the ADCPro Analog-to-Digital Converter Evalutation Software Users Guide.
8.2
Troubleshooting
If ADCPro stops responding while the ADS7953EVM-PDK is connected, try unplugging the power supply
from the PDK. Unload and reload the plug-in before reapplying power to the PDK.
9
Schematic and Bill of Materials
Complete schematics for the ADS7953EVM are appended to this user guide. The bill of materials is
provided in Table 7. Gerber files are available on request. Please e-mail [email protected] and ask for
details on how to receive the files.
26
ADS79xxEVM and ADS79xxEVM-PDK
SLAU262C – January 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
AGND
J1
2
4
6
8
10
12
14
16
10
8
6
4
2
9
7
5
3
1
VCC_D
12
Copyright © 2009–2011, Texas Instruments Incorporated
10uF
C31
8X2X.1
1
3
5
7
9
11
13
15
14
16
15
11
18
17
13
20
19
P1
W6
REF-
CH1
CH7
CH6
CH5
CH4
CH3
CH2
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
REF+
CH0
9
7
5
3
1
SLAU262C – January 2009 – Revised May 2011
Submit Documentation Feedback
10
8
6
4
2
P3B
10
R22
GND
10uF
C17
AGND
TP3
33
R6
33
R7
33
R8
33
R9
33
R10
W1
Ch2_FLT
C9
Ch5_FLT
270pF
C8
270pF
Ch4_FLT
270pF
C10
Ch3_FLT
270pF
C11
+VCC
AGND
AGND
AGND
AGND
AGND
Ch1_FLT
C12
270pF
2
3
GND
+In
-In
C15
C28
6
1.0uF
U1
OPA365
Output
0
+VCC
NI
R12
7
4
R11
NI
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
33
R3
33
R2
33
R1
33
R21
33
R20
33
R19
33
R18
33
R17
W4
CH0
AGND
AGND
AGND
AGND
AGND
AGND
AGND
270pF
C22
C2
270pF
C5
270pF
C4
270pF
C3
270pF
C24
270pF
C14
270pF
C13
270pF
REF_P
REF_M
Ch0_FLT
270pF
C1
AGND
AGND
33
R13
C27
10uF
C23
0.1uF
+VCC
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
VCC_D
R25
47.5K
+VCC
AGND
ADS79XX
AGND
Ch8
Ch9
Ch10
Ch11
NC/Ch12
NC/Ch13
NC/Ch14
NC/Ch15
AGND
3
1
2
J2
4
1.0uF
C29
AGND/AINM
AINP
MXD
AGND
+VA
REFP
AGND/REFM
GPIO3
GPIO2
U2
R26
47.5K
4
2
REF5025
GND
Vin
U3
AGND
Ch7
Ch6
Ch5
Ch4
Ch3
Ch2
Ch1
Ch0
VCC
VEE
CS
SCLK
SDI
SDO
BDGND
+VBD
GPIO0
GPIO1
Temp
NC
NC
NC
Trim
Vo
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
3
1
7
8
5
6
Ch5_FLT
Ch4_FLT
Ch3_FLT
Ch2_FLT
Ch1_FLT
Ch0_FLT
CS*
SCLK
SDI
SDO
TP1
1.0uF
C30
10uF
C26
VREF+
270pF
AGND
C6 33
R4
270pF
AGND
C7 33
10uF
R5
+VCC
VCC_D
W7
C21
AGND
0.1uF
C16
0.1uF
C25
TP2
CH7
CH6
W5
R16
33
INT
SDO
SDI
FSX
19
17
15
13
11
9
7
5
3
1
P2
REF_M
REF_P
C19
0.1uF R23
33
VCC_D
33
R14
33
R15
CLKX
W3
REF-
VREF+
REF+
AGND
1.0uF 10uF
C18
W2
MCP_24LC256
8
5
6
4
VCC_D
DGND
A0 VCC
A1 SDA
A2 SCL
WP GND
U4
C20
1
2
3
7
NI
R24
20
18
16
14
12
10
8
6
4
2
www.ti.com
Schematic and Bill of Materials
Figure 26. ADS7953EVM Schematic
ADS79xxEVM and ADS79xxEVM-PDK
27
Schematic and Bill of Materials
9.1
www.ti.com
Bill of Materials
Note: All components should be compliant with the European Union Restriction on Use of Hazardous
Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased
components are RoHS-compliant. (For more information about TI's position on RoHS compliance, see the
TI website.)
Table 7. ADS7953EVM Bill of Materials
28
Item No.
Qty
Ref Des
1
1
N/A
Printed Wiring
Board
Description
2
0
C15
Not Installed
Not Installed
Vendor
Part Number
TI
3
0
R11 R14 R24
4
16
C1 - C14 C22 C24
CAP CER 270PF
50V C0G 5% 0603
TDK
C1608C0G1H271J
5
4
C16 C19 C23 C25
CAP CER 0.10UF
25V X7R 10% 0603
TDK
C1608X7R1E104K
6
6
C17 C18 C21 C26
C27
CAP CERAMIC
10UF 6.3V X5R
0603
Panasonic
7
4
C20 C28 C29 C30
CAP CER 1.0UF
16V X7R 0603
Taiyo Yuden
8
1
J1
8X2X.1 Header
Samtec
TMS-108-02-G-D
9
1
J2
2X2X.1 Header
Samtec
TMS-102-02-G-S
10
2
P1 P2 (top side)
10 Pin, Dual Row,
SMT Header (20 P
Samtec
TSM-110-01-T-DVP
11
2
P1B P2B (bottom
side)
10 Pin, Dual Row,
SMT Socket (20 P
Samtec
SSW-110-22-F-DVS-K
12
1
P3 (top side)
5 Pin, Dual Row,
SMT Header (10 Po
Samtec
TSM-105-01-T-DVP
13
1
P3B (bottom side)
5 Pin, Dual Row,
SMT Socket (10 Po
Samtec
SSW-105-22-F-DVS-K
14
19
Yageo
RC0603FR-0733RL
15
1
R12
RES 0.0 OHM
1/10W 5% 0603
SMD
Yageo
RC0603JR-070RL
16
1
R22
RES 10.0 OHM
1/10W 1% 0603
SMD
Yageo
RC0603FR-0710RL
17
2
R25 R26
RES 47.5K OHM
1/10W 1% 0603
SMD
Yageo
RC0603FR0747K5L
18
3
TP1 TP2 TP3
TEST POINT PC
MINI .040D RED
Keystone
5001
19
2
GND GND
TEST POINT PC
MULTI PURPOSE
BLK
Keystone
5011
20
1
U1
2.2V, 50MHz,
Low-Noise,
Single-Sup
TI
OPA365AID
21
1
U2
12/10/8-Bit, 1
MSPS,
16/12/8/4-Cha
TI
ADS7953/52/51/50
22
1
U3
Low-Noise, Very
Low Drift, Precisi
TI
REF5025ID
23
1
U4
IC SERIAL
EEPROM 256K
2.5V 8-SOIC
Microchip
ADS79xxEVM and ADS79xxEVM-PDK
R1 - R10 R13 R15 - RES 33.0 OHM
1/10W 1% 0603
SMD
ECJ-1VB0J106M
EMK107B7105KA-T
24LC256T-I/SN
SLAU262C – January 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
Revision History
www.ti.com
Table 7. ADS7953EVM Bill of Materials (continued)
Item No.
Qty
Ref Des
24
0
W1
25
6
W2 - W7
Vendor
Part Number
Not Installed
Description
Samtec
TMS-102-02-G-S
3 Pin , 2mm Header
Samtec
TMM-103-01-T-S
Revision History
Changes from B Revision (March, 2011) to C Revision ................................................................................................. Page
•
Updated Table 5
..........................................................................................................................
6
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
SLAU262C – January 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
Revision History
29
1
2
3
4
6
5
Revision History
REV
W1
Approved
C15
R11
NI
AGND
ECN Number
NI
R12
VCC_D
0
+VCC
CH0
R25
47.5K
R26
47.5K
C28
D
W4
7
P1
20
17
18
15
16
13
14
11
9
8
5
6
3
4
1
2
3
R10
CH1
Ch0_FLT
+In
1
C22
270pF
U1
OPA365
2
270pF
R9
Ch2_FLT
33
CH5
REF_M
3
REF_P
4
C11
270pF
CH6
C27
5
+VCC
AGND
6
10uF
R8
CH7
C23
Ch3_FLT
33
7
0.1uF
C10
8
270pF
AGND
9
R7
C
Ch4_FLT
33
CH15
10
C9
CH15
270pF
CH14
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
Ch5_FLT
33
CH12
11
C1
12
270pF
R6
CH13
R17
33
AGND
J1
AGND
C8
CH14
270pF
CH11
13
R18
14
33
AGND
C2
15
270pF
CH10
AGND
CH9
CH13
8X2X.1
AGND
TP2
U2
1
AGND
CH4
TP1
4
J2
C12
CH3
2
3
6
AGND
Ch1_FLT
33
CH2
10
7
Output
CH0
D
R13
33
-In
REF+
12
1.0uF
4
19
2
REF-
R19
17
33
CH8
16
C13
18
270pF
AGND
CH12
19
R20
W7
GPIO2
GPIO1
GPIO3
GPIO0
AGND/REFM
+VBD
REFP
BDGND
+VA
SDO
AGND
SDI
MXD
SCLK
AINP
CS
AGND/AINM
VEE
AGND
VCC
NC/Ch15
Ch0
NC/Ch14
Ch1
NC/Ch13
Ch2
NC/Ch12
Ch3
Ch11
Ch4
Ch10
Ch5
Ch9
Ch6
Ch8
Ch7
AGND
AGND
38
37
36
VCC_D
C25
35
34
SDO
33
SDI
32
SCLK
31
CS*
0.1uF
33
W5
30
29
Ch0_FLT
C16
C21
27
Ch1_FLT
0.1uF
10uF
26
Ch2_FLT
25
Ch3_FLT
24
Ch4_FLT
23
Ch5_FLT
FSX
33
SDI
SDO
AGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CH6
C7 33
21
VCC_D
VCC_D
270pF
AGND
20
R24
NI
C14
U4
R4
CH7
C19
0.1uF R23
33
C6 33
270pF
AGND
R21
33
C
DGND
R5
22
270pF
1
2
3
7
A0
A1
A2
WP
8
5
6
4
VCC
SDA
SCL
GND
MCP_24LC256
C24
B
270pF
TP3
AGND
R22
10
33
INT
AGND
B
R15
R14
+VCC
28
CLKX
ADS79XX
33
CH11
P2
R16
+VCC
CH10
C17
R1
33
C3
10uF
270pF
REF+
AGND
CH9
R2
33
C4
2
+VCC
9
7
5
3
1
C31
10uF
6
VREF+
P3B
CH8
GND
GND
C20
C18
10uF
1.0uF
R3
33
REF_P
C26
AGND
10
8
6
4
2
W6
Vo
Vin
C29
270pF
VCC_D
W2
U3
Trim
1.0uF 10uF
5
C30
C5
270pF
AGND
4
GND
Temp
NC
NC
NC
3
1
7
8
REF_M
VREF+
REFW3
1.0uF
AGND
REF5025
AGND
ti
A
A
12500 TI Boulevard. Dallas, Texas 75243
Title:
Engineer:
Tom Hendrick
Drawn By:
FILE:
1
2
3
4
5
ADS79xx Evaluation Module
DOCUMENTCONTROL #
REV:
6503756
Lisa Parker
ADS795x_A.sch
DATE:
17-Nov-2008
SIZE:
6
SHEET:
1
OF:
1
1
Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY
SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY 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 all
claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to
take any and all appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the
product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and
can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this
equipment in other environments may cause interference with radio communications, in which case the user at his own expense
will be required to take whatever measures may be required to correct this interference.
EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 3.3 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 are
questions 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 the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +30°C. The EVM is designed to
operate properly with certain components above +85°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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