TI1 ADS1146EVM Contains all support circuitry needed for the ads1146/ads1246 Datasheet

User's Guide
SBAU149A – June 2009 – Revised July 2009
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK,
ADS1246EVM-PDK
ADS1246EVM (Left) and ADS1246EVM-PDK (Right)
This user's guide describes the characteristics, operation, and use of the ADS1146EVM and
ADS1246EVM, both by themselves and as part of the ADS1146EVM-PDK or ADS1246EVM-PDK. These
evaluation modules (EVMs) are evaluation boards for the ADS1246, a 24-bit delta-sigma analog-to-digital
converter (ADC), and the ADS1146, a 16-bit version of the ADS1246. The EVM allows evaluation of all
aspects of the ADS1146 or ADS1246 devices. Complete circuit descriptions, schematic diagrams, and a
bill of materials are included in this document.
The following related documents are available through the Texas Instruments web site at
http://www.ti.com.
EVM-Compatible Device Data Sheets
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Device
Literature Number
ADS1146
SBAS453
ADS1246
SBAS426A
REF5020
SBOS410C
OPA227
SBOS110A
TPS3836L30
SLVS292D
TPS79225
SLVS337B
TPS72325
SLVS346B
SN74LVC2G157
SCES207K
PCA9535
SCPS129I
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
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Contents
EVM Overview ............................................................................................................... 3
Analog Interface.............................................................................................................. 4
Digital Interface .............................................................................................................. 4
Power Supplies .............................................................................................................. 5
Voltage Reference ........................................................................................................... 6
Clock Source ................................................................................................................. 7
EVM Operation ............................................................................................................... 7
ADS1246EVM-PDK Kit Operation ......................................................................................... 8
Evaluating Performance with the ADCPro Software ................................................................... 16
Schematics and Layout .................................................................................................... 23
List of Figures
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Reference Select Switch S1 ................................................................................................ 6
Jumper J2 ..................................................................................................................... 7
ADS1246EVM Default Jumper Locations ................................................................................ 8
Virtual COM Port Installer................................................................................................... 9
Virtual COM Port Setup ..................................................................................................... 9
MMB3 Switch Locations .................................................................................................. 10
Connecting ADS1246EVM to MMB3 ................................................................................... 10
MMB3 Block Diagram...................................................................................................... 11
ADCPro Software Start-Up Display Window............................................................................ 12
ADS1246EVM-PDK Plug-In Display Window........................................................................... 13
Connection Timeout ....................................................................................................... 14
Firmware Download Message Box ...................................................................................... 14
Firmware Download Progress Indicator ................................................................................. 15
Firmware Download Complete Message Box .......................................................................... 15
I/O Config Tab ............................................................................................................. 17
Enabling VBIAS on a Channel ........................................................................................... 18
Cal Tab ..................................................................................................................... 20
About Tab ................................................................................................................... 21
Progress Bar While Collecting Data ..................................................................................... 22
List of Tables
1
2
3
4
5
6
7
J8/J4: Analog Interface Pinout ............................................................................................. 4
J7: Serial Interface Pins ..................................................................................................... 4
J3 Configuration: Power-Supply Input .................................................................................... 5
J10 Configuration: Power Options ......................................................................................... 6
Reference Voltage Options ................................................................................................. 6
List of Switches .............................................................................................................. 8
ADS1146EVM/ADS1246EVM Bill of Materials ......................................................................... 23
ADCPro is a trademark of Texas Instruments.
Microsoft, Windows 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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EVM Overview
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EVM Overview
1.1
Features
ADS1146EVM/ADS1246EVM Features:
• Contains all support circuitry needed for the ADS1146/ADS1246
• ±2.5V and +5V power supply options for ADC
• Voltage reference options: external or onboard
• Compatible with the TI Modular EVM System
ADS1146EVM-PDK/ADS1246EVM-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 ADS1146EVM-PDK or ADS1246EVM-PDK is available. This kit combines
the ADS1146/ADS1246EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™
software for evaluation.
The MMB3 motherboard allows the ADS1146/ADS1246EVM to be connected to the computer via an
available USB port. This manual shows how to use the MMB3 as part of the
ADS1146EVM-PDK/ADS1246EVM-PDK, but does not provide technical details about the MMB3 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 ADS1146EVM-PDK/ADS1246EVM-PDK is controlled by a plug-in 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 from the TI web site.
This manual covers the operation of both the ADS1146/ADS1246EVM and the
ADS1146EVM-PDK/ADS1246EVM-PDK. Throughout this document, the abbreviation EVM and the term
evaluation module are synonymous with the ADS1146/ADS1246EVM. For clarity of reading, the rest of
this manual will refer only to the ADS1246EVM or ADS1246EVM-PDK, but operation of the EVM and kit
for the ADS1146 is identical, unless otherwise noted.
1.2
Introduction
The ADS1246EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any modular EVM system interface card.
The ADS1246EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS1246EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the
ADS1246EVM is useful for prototyping designs and firmware.
Note that the ADS1246EVM has no microprocessor and cannot run software. To connect it to a computer,
some type of interface is required.
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Analog Interface
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Analog Interface
For maximum flexibility, the ADS1246EVM 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 J8. This header/socket provides access to the analog input pins of
the ADS1246. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options. These signals can also be connected to the terminal block J4.
All of the pins on J4 and J8 are connected with minimal filtering or protection. Use appropriate caution
when handling these pins. Table 1 summarizes the pinouts for analog interfaces J4 and J8.
Table 1. J8/J4: Analog Interface Pinout
Signal
Description,
ADS1146/ADS1246
J8.1, J4-2
A0(–)
AINN
J8.2, J4-1
A0(+)
AINP
J8.3-8
Unused
—
J8.18
REF–
External Reference source input
(– side of differential input)
J8.20
REF+
External Reference source input
(+ side of differential input)
J8.10-16 (even)
Unused
—
J8.15
Unused
J8.9-19 (odd), J4-9
AGND
Pin Number
3
Digital Interface
3.1
Serial Data Interface
—
Analog ground connections
(except J8.15)
The ADS1246EVM 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 J7. 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 J7 are 3.3V CMOS, except for the I2C™ pins. These pins conform to 3.3V I2C rules.
Table 2 describes the J7 serial interface pins.
Table 2. J7: Serial Interface Pins
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Pin No.
Pin Name
Signal Name
I/O Type
Pullup
J7.1
CNTL
CS
In
High
Function
J7.2
GPIO0
START
In
High
J7.3
CLKX
SCLK
In
None
ADS1246 SPI
clock
J7.4
DGND
DGND
In/Out
None
Digital ground
J7.5
CLKR
Unused
—
None
J7.6
GPIO1
MR
In
High
J7.7
FSX
Unused
—
None
J7.8
GPIO2
Unused
—
None
Master reset
J7.9
FSR
DRDY
Out
None
J7.10
DGND
DGND
In/Out
None
Digital ground
J7.11
DX
DIN
In
None
ADS1246 SPI
data in
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Power Supplies
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Table 2. J7: Serial Interface Pins (continued)
Pin No.
Pin Name
Signal Name
I/O Type
Pullup
J7.12
GPIO3
PWRSEL
In
High
Selects ±2.5V
or +5V supply
J7.13
DR
DOUT/DRDY
Out
None
ADS1246 data
out
J7.14
GPIO4
Unused
—
None
J7.15
INT
DRDY
Out
None
J7.16
SCL
SCL
I2C
High
I2C clock
J7.17
TOUT
CLK
In
None
Can be used to
provide a clock
from a
processor
Digital ground
J7.18
DGND
DGND
In/Out
None
J7.19
GPIO5
CLK Select
—
None
J7.20
SDA
SDA
I2C
High
Function
I2C data
Many pins on J7 have weak pull-up resistors. These resistors provide default settings for many of the
control pins. Many pins on J7 correspond directly to ADS1246 pins. See the ADS1246 data sheet for
complete details on these pins.
4
Power Supplies
J3 is the power-supply input connector. Table 3 lists the configuration details for J3.
Table 3. J3 Configuration: Power-Supply Input
Pin No.
Pin Name
Function
Required
J3.1
+VA
Unused
No
J3.2
–VA
Unused
No
J3.3
+5VA
+5V analog supply
Always
J3.4
–5VA
–5V analog supply
Only in bipolar mode
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
+3.3VD
3.3V digital supply
Always
J3.9
VD1
Unused
No
J3.10
+5VD
+5V digital supply
No
All of the power supplies (AVDD, AVSS, and DVDD) have corresponding jumpers on J10 that can be
replaced with a current meter to measure the respective supply currents.
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Voltage Reference
4.1
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Power Options
J10 is arranged as five rows, each of which can be shorted. Table 4 lists the power option details for J10.
For normal operation, J10.1-2, J10.3-4, and J10.5-6 must be connected (direct or through an ammeter),
and either (or both) of J10.7-8 and J10.9-10 must be connected; otherwise, the board will not function.
Table 4. J10 Configuration: Power Options
5
Row
Name
1-2
ADC AVDD
AVDD supply current measurement point for the
ADC. Must be connected for operation.
Function
3-4
ADC AVSS
AVSS supply current measurement point for the
ADC. Must be connected for operation.
5-6
ADC DVDD
DVDD supply current measurement point for the
ADC. Must be connected for operation.
7-8
DGND
Connects DGND to board ground.
9-10
AGND
Connects AGND to board ground.
Voltage Reference
The ADS1246 device always uses an external reference. The EVM provides a 2.048V reference for the
device from U1, filtered and buffered through U2. This 2.048V may be used to drive the REFP input, or
REFP can be connected to the external reference on J8 through switch S1. REFP should not be
connected to AVDD through switch S1 because this connection will violate the specification for the
maximum reference input. Figure 1 shows switch S1 as it appears on the EVM. The low side of the
reference (REFN) is tied to AVSS. The different reference options under different supply conditions are
outlined in Table 5.
Figure 1. Reference Select Switch S1
Table 5. Reference Voltage Options
(1)
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AVDD
AVSS
J1 Setting
S1 Position (1)
REFP
REFN
5V
0V
1-2
BUFF
2.048V
0V
2.048V
5V
0V
2-3
BUFF
0V
0V
Invalid Selection
Reference Voltage
5V
0V
—
Center
REF+ (J8.20)
0V
Up to AVDD – 1
2.5V
–2.5V
1-2
BUFF
–0.452V
–2.5V
2.048V
2.5V
–2.5V
2-3
BUFF
0V
–2.5V
2.5V
2.5V
–2.5V
—
Center
REF+ (J8.20)
–2.5V
Up to AVDD – AVSS – 1
Switch S1 should not be set to AVDD.
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Clock Source
The ADS1246 has an internal clock or can be provided an external clock. The EVM uses the internal clock
mode only. Provision is made on the EVM circuit board, however, for an external clock source. A footprint
is provided at U8 for a crystal oscillator to be mounted on the board. An external clock may also be
provided by a processor on the TOUT pin (J7.17), or an external clock source connected to J9.1 (ground)
and J9.2 (signal).
J2 controls how the clock source is selected. With pins J2.1 and J2.2 shorted, GPIO5 from J7.19 can
control whether the A or B side of U7 is selected. If the A side is selected, the clock should come from an
external source provided as described above. If the B side is selected, the clock should come from the
crystal oscillator. If a selection is made and no clock is provided on that input, the ADS1246 detects that
no external clock is present and enables its internal oscillator.
6.1
Usage in PDK
If using the ADS1246EVM as part of the ADS1246EVM-PDK, remove any shorting blocks on jumper J6,
and make sure J2 has a jumper between pins 1 and 2 (the IO position). This configuration grounds the
CLK input to the ADS1246 and ensures that the internal oscillator starts up.
6.2
Usage as a Stand-Alone EVM
If using the EVM in your own system and not with the PDK hardware and software, observe the following
recommendations:
• J6 should be removed if the external clock source is used and the TOUT pin is still driven by a
processor in order to avoid conflicts.
• Jumper J2 can be used to always select the U8 oscillator (DVDD position) or allow the
onboard/external clock selection to be controlled by GPIO5 (J7.19) as shown in Figure 2.
Figure 2. Jumper J2
7
EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the ADS1246EVM.
7.1
Analog Input
The analog input source can be applied directly to J8 (top or bottom side) or through signal-conditioning
modules available for the the modular EVM system. Terminal block J4 is connected in parallel with the
analog signal connections to J8. The input has a 47Ω/47pF RC filter in series with it, and a differential
0.1µF capacitor is across the input pair for use with differential signals.
7.2
Digital Control
The digital control signals can be applied directly to J7 (top or bottom side). The modular ADS1246EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface or
HPA-MCU Interface boards available from Texas Instruments, or the MMB3 if purchased as part of the
ADS1246EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the
ADS1246, see the relevant product folder on the TI web site.
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7.3
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Default Jumper Settings and Switch Positions
Figure 3 shows the jumpers found on the EVM and the respective factory default conditions for each.
Figure 3. ADS1246EVM Default Jumper Locations
Table 6 lists the switches found on the EVM and the respective factory default conditions for each.
Table 6. List of Switches
8
Switch
Default Position
Switch Description
S1
Left
Onboard reference
ADS1246EVM-PDK Kit Operation
This section provides information on using the ADS1246EVM-PDK, including setup, program installation,
and program usage.
To prepare
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
to evaluate the ADS1246 with the ADS1246EVM-PDK, complete the following steps:
Install the ADCPro software (if not already installed) on a PC.
Install the ADS1246EVM-PDK EVM plug-in software.
Complete the USB driver installation process.
Set up the ADS1246EVM-PDK.
Connect the ADS1246EVM-PDK to the computer with a USB cable.
Run the ADCPro software.
Each task is described in the subsequent sections of this document.
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8.1
Installing the ADCPro Software
CAUTION
Do not connect the ADS1246EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS1246EVM-PDK as a connected device.
The CD-ROM shipped with the ADS1246EVM contains an installer for ADCPro as well as an installer for
the ADS1246EVM plug-in. The latest software is available from the TI website at http://www.ti.com/. Refer
to the ADCPro User Guide for instructions on installing and using ADCPro.
To install the ADS1246EVM-PDK plug-in, run the file: ads1246evm-pdk-plug-in-1.0.0.exe (1.0.0 is the
version number, and increments with software version releases - you may have a different version on your
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 ADS1246EVM-PDK plug-in, once you have
installed a version of it.
Follow the on-screen prompts. Once the ADCPro plug-in installs, you will be prompted to install the Virtual
COM port driver as shown in Figure 4.
Figure 4. Virtual COM Port Installer
Press OK and the screen shown in Figure 5 is displayed.
Figure 5. Virtual COM Port Setup
If you already have a TUSB3410 Virtual COM port driver installed on your system, select Cancel;
otherwise, press Setup and follow the on-screen prompts. You may be notified that the driver is not
digitally signed. If this message appears, select Continue Anyway and proceed.
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Setting Up the ADS1246EVM-PDK
The ADS1246EVM-PDK contains both the ADS1246EVM and the MMB3 motherboard; however, the
devices are shipped unconnected. Follow these steps to set up the ADS1246EVM-PDK.
Step 1. Unpack the ADS1246EVM-PDK kit.
Step 2. Set the switches on the MMB3 as described below, as shown in Figure 6.
• Set switch SW4 to the right.
• Set the DAC switch (SW5) to the OUT position (to the right).
Figure 6. MMB3 Switch Locations
Step 3.
Plug the ADS1246EVM into the MMB3 as Figure 7 illustrates.
Figure 7. Connecting ADS1246EVM to MMB3
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CAUTION
Do not misalign the pins when plugging the ADS1246EVM into the MMB3.
Check the pin alignment carefully before applying power to the PDK.
Step 4.
8.2.1
Set the jumpers and switches on the ADS1246EVM as shown in Figure 3 (note that these
settings are the factory-configured settings for the EVM).
About the MMB3
The MMB3 is a Modular EVM System motherboard. It is designed around the MSP430F449, a low-power
microcontroller from Texas Instruments. Figure 8 shows a block diagram of the MMB3.
USB
USB
RESET
+5VA
-5VA
+5VD
PWR & VREF
+3.3V
+1.8V
+10V
TUSB3410
-10V
Supplied to
Daughtercard
Power Connector
LCD DISPLAY
2.5V
OPER
BSL
+1
DAC1220
MSP430F449
RESET
-1
DAC
IN
OUT
Analog
Daughtercard
Modular
Connectors
Serial
Power
Joystick
Power from
PWR & VREF Block
Figure 8. MMB3 Block Diagram
The MMB3 was designed to be used as a stand-alone demonstration platform for low-speed data
converters. It features an onboard 20-bit digital-to-analog converter (DAC) that can be used as a signal
source for an ADC under test, and has a joystick for control of functions on the board when it is not
controlled by a PC. These features are experimental and not supported in the ADS1246EVM-PDK at
this time.
The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA,
–5VA, and ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA.
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The MMB3 is not sold as a microcontroller development board, and it is not available separately. TI cannot
offer support for the MMB3 except as part of an EVM kit. For schematics or other information about the
MMB3, contact Texas Instruments.
8.3
EVM Power Supply
The ADS1246EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3
provides 3.3V and ±5V to the ADS1246EVM.
8.4
Running the Software and Download of Firmware to MMB3
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 ADS1246EVM-PDK is called ADCPro. This program uses plug-ins to
communicate with the EVM. The ADS1246EVM-PDK plug-in is included in the ADS1246EVM-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 installing ADCPro and plug-ins, follow these procedures to run ADCPro and perform
any necessary firmware installations. Make sure the ADCPro software and device plug-in software are
installed from the CD-ROM as described in .
Step 1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 9
appears.
Figure 9. ADCPro Software Start-Up Display Window
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space
Step 2.
Select ADS1246EVM from the EVM drop-down menu. The ADS1246EVM-PDK plug-in
appears in the left pane, as shown in Figure 10.
Figure 10. ADS1246EVM-PDK Plug-In Display Window
Step 3.
The ADS1246EVM-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.
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ADS1246EVM-PDK Kit Operation
space
Step 4.
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If the plug-in cannot connect to the EVM, you will see a window as shown in Figure 11. This
message may indicate that the firmware is not loaded on the MMB3. You may select Retry
Auto Connect; if that action fails, select Retry Manual Connect and specify the COM port to
be used.
Figure 11. Connection Timeout
Step 5.
The plug-in detects whether or not the board has the correct firmware loaded. The first time
you use the ADS1246EVM-PDK, the firmware for the MMB3 may need to be downloaded to
the MMB3. If the firmware must be loaded, you will see a screen similar to that shown in
Figure 12.
Figure 12. Firmware Download Message Box
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Switch the BSL switch (SW4) on the MMB3 to the BSL position (to the left) as instructed, then press OK.
The plug-in downloads the firmware to the MMB3. This operation may take a couple of minutes, so the
progress is updated in the message at the top of the ADS1246 plug-in window (as Figure 13 shows). The
firmware is saved in flash memory on the MMB3, so this operation should only need to be performed
once.
Figure 13. Firmware Download Progress Indicator
When the firmware download completes, the message box shown in Figure 14 appears. Follow the
on-screen instructions and the plug-in should now connect to the EVM.
Figure 14. Firmware Download Complete Message Box
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
15
Evaluating Performance with the ADCPro Software
9
www.ti.com
Evaluating Performance with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. 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.
9.1
Using the ADS1246EVM-PDK Plug-in
The ADS1246EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS1246. It
consists of a tabbed interface (see Figure 15), with different functions available on different tabs. These
controls are described in this section.
You can adjust the ADS1246EVM settings when you are not acquiring data. During acquisition, all
controls are disabled and settings may not be changed.
When you change a setting on the ADS1246EVM plug-in, the setting immediately updates on the board.
Settings on the ADS1246EVM correspond to settings described in the ADS1246 data sheet (available for
download at http://www.ti.com); see the data sheet for details.
The ADS1246EVM-PDK plug-in has a tabbed interface, with three different tabs to control the functions of
the ADS1246. These tabs are described below.
16
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
www.ti.com
9.1.1
Evaluating Performance with the ADCPro Software
Configuration Tab
This tab (shown in Figure 15) is the primary tab that controls the function of the multiplexer and power and
reference settings in the ADS1246. The tab is divided into two sections: I/O Configuration and Supply
Configuration.
Figure 15. I/O Config Tab
SBAU149A – June 2009 – Revised July 2009
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17
Evaluating Performance with the ADCPro Software
9.1.1.1
www.ti.com
I/O Configuration Section
Each input channel can have a VBIAS applied to it. Checking the VBIAS box on a channel applies the
VBIAS voltage, which is approximately half the value of the supply. You can test this option as shown in
Figure 16, using one input tied to something close to ground (make sure you observe the common-mode
restrictions listed in the ADS1246 device data sheet) as a reference for this signal.
Figure 16. Enabling VBIAS on a Channel
18
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
Evaluating Performance with the ADCPro Software
www.ti.com
The System Monitor button allows you to access the internal system monitor channels of the ADS1246.
When pressed, this button disables the other analog input channel controls, and the system monitor
channel selections are enabled. You can select Offset, Gain, or Temperature as the channel to convert.
Note that some of these channels are scaled by a factor when read; refer to the ADS1246 data sheet to
determine these factors.
The PGA Gain control sets the PGA gain, and the Data Rate control sets the data rate for the device.
Note that the data rate can go quite low; therefore, if the block size is large, the time it takes to collect a
block of data can be quite long. It is advisable to first test collection at the higher data rates. Once a test is
known to work properly, drop down to the lower data rate and allow sufficient time to collect the data.
The BCS control sets the current level of the burnout current sources; it may be set Off, or to 0.5µA, 2µA,
or 10µA.
The Power Down control powers down the ADS1246. Note that no data can be collected if the Power
Down button is activated.
9.1.1.2
Supply Configuration
This section controls the selection of the power supply mode and reference voltage.
The Power Supply control selects between single supply (+5V) mode and bipolar supply (±2.5V) mode.
The EVM draws its supply voltages from the MMB3 motherboard, and has onboard circuitry to select
between the +5V and bipolar supplies.
The VREF value is set to 2.048V, with switch S1 set to BUFF. S1 should not be set to the AVDD position,
in order to prevent the reference from exceeding the maximum specified input.
SBAU149A – June 2009 – Revised July 2009
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ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
19
Evaluating Performance with the ADCPro Software
9.1.2
www.ti.com
Cal Tab
The Cal tab (shown in Figure 17) controls the calibration functions of the ADS1246.
Figure 17. Cal Tab
Pressing the Self Offset Calibrate button causes the ADS1246 to perform a self calibration; the offset
and full-scale register values are then updated on the plug-in screen. You may also write to these
registers by typing in hex values in the New fields, then press the Set button. You may read the values at
any time by pressing the Read button.
20
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
www.ti.com
9.1.3
Evaluating Performance with the ADCPro Software
About Tab
The About tab displays information about the EVM and software, as shown in Figure 18.
Figure 18. About Tab
The Plugin Version and Firmware Version indicators show the version numbers of the plug-in and
firmware code, respectively.
The ID indicator shows the value of the ID [3:0] bits in the ADS1246 ID register.
The Notes indicator may show relevant notes about the plug-in or firmware code, if there are any.
SBAU149A – June 2009 – Revised July 2009
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ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
21
Evaluating Performance with the ADCPro Software
9.1.4
www.ti.com
Collecting Data
Once you have configured the ADS1246 for your 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
ADS1246EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress
bar as shown in Figure 19.
Figure 19. 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 User Guide.
22
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
SBAU149A – June 2009 – Revised July 2009
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Schematics and Layout
www.ti.com
9.2
Troubleshooting
If the ADS1246EVM plug-in cannot find the ADS1246EVM-PDK, press the USB RESET button on the
MMB3 (refer to Figure 6) and try again.
If ADCPro stops responding while the ADS1246EVM-PDK is connected, try unplugging the USB cable
from the PDK. Unload and reload the plug-in before reapplying power to the PDK.
10
Schematics and Layout
Schematics for the ADS1146EVM and ADS1246EVM are appended to this user's guide. The bill of
materials is provided in Table 7.
10.1 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 http://www.ti.com.)
Table 7. ADS1146EVM/ADS1246EVM Bill of Materials
Item No.
Qty
1
1
Value
Ref Des
2
4
1µF
C1-C3, C17
3
2
22µF
4
9
5
N/A
Description
Vendor
Part Number
Texas Instruments
6508033
Capacitor, X7R Ceramic 1µF
±10%, 16WV, Size = 0603
TDK
C1608X7R1C105KT
C4, C5
Capacitor, X5R Ceramic 22µF
±20%, 16WV, Size = 1210
TDK
C3225X5R1C226MT
0.1µF
C6-C13, C15
Capacitor, X7R Ceramic 0.1µF
±10%, 25WV, Size = 0603
TDK
C1608X7R1E104KT
1
0.15µF
C14
Murata
GRM188R71C154KA0
1D
6
6
10µF
C16, C18, C19,
C21-C23
Capacitor, X5R Ceramic 10µF
±20%, 6.3WV, Size = 0805
TDK
C2012X5R0J106MT
7
2
47pF
C24, C25
Capacitor, C0G Ceramic 47pF
±5%, 50WV, Size = 0603
TDK
C1608C0G1H470JT
8
1
10nF
C20
Capacitor, C0G Ceramic 10nF
±5%, 25WV, Size = 0603
TDK
C1608C0G1E103JT
9
3
D1, D2, D5
Fairchild
BAT54
10
2
D3, D4
5.1V, Zener Diode
On Semiconductor
MMBZ5231BLT1G
11
2
J1, J2
Header Strip, 3-pin ( )
Samtec
TSW-103-07-L-S
12
1
J3A
10-pin SMT Plug
Samtec
TSM-105-01-L-DV-P
13
1
J3B
10-pin SMT Socket
14
1
J4
Terminal Block, 3 position
15
0
J5
Header Strip, 6-pin ( )
16
2
J6, J9
17
2
18
2
19
1
J10
20
2
Q1, Q2
21
1
22
1
100kΩ
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
ADS1246 EVM PWB
Capacitor, X7R Ceramic
0.15µF ±10%, 16WV, Size =
0603
DIODE SCHOTTKY 30V
200MA SOT-23
Samtec
SSW-105-22-F-D-VS-K
On Shore
Technology
ED555/3DS
Header Strip, 2 pin ( )
Samtec
TSW-102-07-L-S
J7A, J8A
20-pin SMT Plug
Samtec
TSM-110-01-L-DV-P
J7B, J8B
20-pin SMT Socket
Samtec
SSW-110-22-F-D-VS-K
Header Strip, 10-pin ( )
Samtec
TSW-105-07-L-D
MOSFET, P-Channel, 2.5V
Fairchild
FDN302P
Q3
Enhancement Mode FET,
N-Channel
Fairchild
FDN337N
RA1
Resistor, 8 Thick Film Chip
Array 100kΩ, 5%, 63mW
CTS
745C101104JPTR
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
23
Schematics and Layout
www.ti.com
Table 7. ADS1146EVM/ADS1246EVM Bill of Materials (continued)
24
Item No.
Qty
23
0
Value
Ref Des
Vendor
Part Number
24
1
10kΩ
R1
Resistor, Thick Film Chip
10kΩ, 5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ103V
25
1
2kΩ
R2
Resistor, Thick Film Chip 2kΩ,
1%, 1/16W, Size = 0603
Panasonic
ERJ-3EKF2001V
26
4
47Ω
R3, R4, R7, R10
Resistor, Thick Film Chip 47Ω,
5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ470V
27
2
2.7kΩ
R5, R6
Resistor, Thick Film Chip
2.7kΩ, 5%, 1/10W, Size =
0603
Panasonic
ERJ-3GEYJ272V
28
2
100kΩ
R8, R13
Resistor, Thick Film Chip
100kΩ, 5%, 1/10W, Size =
0603
Panasonic
ERJ-3GEYJ104V
29
1
47kΩ
R11
Resistor, Thick Film Chip
47kΩ, 5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ473V
30
2
0
R14, R15
Resistor, Thick Film Chip 0Ω,
5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEY0R00V
31
2
470kΩ
R9, R12
Resistor, Thick Film Chip
470kΩ, 5%, 1/10W, Size =
0603
Panasonic
ERJ-3GEYJ474V
32
1
S1
NKK
SS14MDP2
33
0
TP1, TP2, TP4
34
1
TP3
PCB Test Point, Large Loop,
Through-Hole
Keystone
Electronics
5011
35
1
U1
Precision Voltage Reference,
2.048V
Texas Instruments
REF5020ID
36
1
U2
Precision Operational Amplifier
Texas Instruments
OPA227U
37
1
U3
16-Bit I2C I/O Expander
Texas Instruments
PCA9535RGE
38
1
U4
Inverter, Single Gate
Texas Instruments
SN74AHCT1G04DBVR
39
1
U5
Buffer, Open Drain, Single
Gate
Texas Instruments
SN74LVC1G07DBVRG
4
40
1
U6
LDO Voltage Regulator, 2.5V,
100mA
Texas Instruments
TPS79225DBVRG4
41
1
U7
Single, 2-Line to 1 Data
Selector/Multiplexer
Texas Instruments
SN74LVC2G157DCT
42
0
U8
3.3 V Oscillator
43
1
U9
LDO Voltage Regulator, 2.5V,
200mA
Texas Instruments
TPS72325DBVTG4
44
1
U10
Precision Delta-Sigma ADC,
24-bit/16-bit
Texas Instruments
ADS1246IPW/ADS114
6IPW
45
1
U11
EEPROM, 1.8V, 256k
46
1
U12
Supervisor, 2.64V Threshold
47
8
N/A
Shorting Blocks
RA2
Description
Resistor, Chip Array 4
Independent Bus 100kΩ, 5%,
1/16W, SMD
Switch, Mini Slide, SP3T
PCB Test Point, Mini Loop,
Through-Hole
ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK
Microchip
24AA256-I/ST
Texas Instruments
TPS3836L30DBVT
Samtec
SNT-100-BK-T
SBAU149A – June 2009 – Revised July 2009
Submit Documentation Feedback
1
2
3
4
5
150nF
DVDD
4
VIN
TEMP
GND
C1
1uF
VOUT
TRIM
6
C4
22uF
5
C5
22uF
0.1uF
0.1uF
U12
5
C15
0.1uF
-5V
4
TP1
AVSS
REF5020ID
D
VDD
RESET
CT
GND
MR
1
2
3
TPS3836DBV
C22
10uF
AVDD
DVDD
J7
DVDD
R15
0
C21
10uF
10uF
1
5
6
10
R14
0
1
3
5
7
9
11
13
15
17
19
C23
12
16
15
13
14
11
4
R10
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
R5
2.7K
2
47
C
J6
6
5
4
3
2
1
1
J7A (TOP) = SAM_TSM-110-01-L-DV-P
J7B (BOTTOM) = SAM_SSW-110-22-F-D-VS
DVDD
ADS1146IPW
ADS1246IPW
C3
3
2
1
J9
R12
470K
R11
47K
JPR-1X3
1uF
7
8
9
10
11
12
EXT CLK INPUT
GPIO5
DVDD
U3
2
J2
TERMBLOCK-3
U7
B
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
2
4
6
8
10
12
14
16
18
20
8
5
3
7
TP4
AVDD
AVDD
VCC A/B
Y
A
Y
B
G
GND
6
1
2
4
SN74LVC2G157DCT
+3.3V
D1
FRC_BAT54
DAUGHTER-ANALOG
1
C2
1uF
D3
ONS_MMBZ5231BLT1
IN
3
OUT
BYP
GND
EN
DVDD
J10
5
4
2
C11
0.1uF
TPS79225DBV
C18
10uF
1
3
EOH
OUT
R9
470K
DVDD
4
2
VCC
GND
A2
A1
INT
VCC
SDA
SCL
C20
10nF C0G
CRY_C3391-4.096
24
23
22
21
20
19
DVDD
C12
0.1uF
PCA9535RGE
AVDD
+2.5V
U6
+5V
RefRef+
U8
OBCLK
P06
P07
GND
P10
P11
P12
P13
P14
P15
P16
P17
A0
J8
1
3
5
7
9
11
13
15
17
19
R6
2.7K
SERIALHDR
TOUT
9
47pF
CLK
AINN
2
3
8
C25
3
R7
47
DVDD
C7
0.1uF
1
2
CS
SCLK
DIN
DRDY
DOUT/DRDY
START
RESET
DGND
47pF
AINP
AVSS
J4
C24
REFP
REFN
47
7
AVDD
U10
R4
C
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
2
4
6
8
10
12
14
16
18
20
P05
P04
P03
P02
P01
P00
2
3
4
C16
10uF
NKK_SS14MDP2
D2
FRC_BAT54
13
14
15
16
17
18
10K
U1
47
C8
1
7
1
8
1
2
3
OPA227
C10
S1
Ref+
R3
6
3
TP2
REFP
D5
FRC_BAT54
0.1uF
U2
2
R1
APPROVED
RA1A
100K
AVDD
C6
+5V
ENGINEERING CHANGE NUMBER
C14
+5V
D
REV
DVDD
2K
J1
JPR-1X3
6
REVISION HISTORY
R2
1
3
5
7
9
2
4
6
8
10
B
JUMPER FUNCTIONS
DVDD
ADC AVDD
ADC AVSS
DIGITAL=3.3V
DGND
AGND
RA2
100K
JPR-2X5
J8A (TOP) = SAM_TSM-110-01-L-DV-P
J8B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
5
SN74AHCT1G04DBV
+5V
4
FRC_FDN302P
3
4
-2.5V
U9
-5V
-5VA
2
3
C17
1uF
1
3
5
7
9
D4
ONS_MMBZ5231BLT1
5.1V
IN
EN
OUT
BYP
GND
2
4
6
HEADER-3X2_SPECIAL
J3
SN74LVC1G07DBV
3
2
1
3
5
R8
100K
U5
2
5
U4
U11
J5
Q1
+5V
+VA
+5VA
DGND
+1.8VD
+3.3VD
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
1
2
3
7
A0
A1
A2
WP
MCP_24AA256-I/ST
C13
0.1uF
C19
10uF
J3A (TOP) = SAM_TSM-105-01-L-DV-P
J3B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
ti
+5V
A
R13
100K
TP3
GND
PRECISION ANALOG PRODUCTS
Q3
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA
FRC_FDN337N
FRC_FDN302P
DRAWN BY BOB BENJAMIN
DOCUMENT CONTROL NO. 6508032
SHEET
2
ADS1146EVM
ADS1246EVM
TITLE
ENGINEER RICK DOWNS
GND
1
C9
0.1uF
DAUGHTER-POWER
5
4
1
TPS72325DBV
Q2
DVDD
8
5
6
4
VCC
SDA
SCL
GND
3
4
5
1
OF 1
SIZE B
DATE
30-MAR-2009
FILE
6
REV
A
A
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 3.3V to 5V and the output voltage range of 0V to 5V.
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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2009, Texas Instruments Incorporated
IMPORTANT NOTICE
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DLP® Products
DSP
Clocks and Timers
Interface
Logic
Power Mgmt
Microcontrollers
RFID
RF/IF and ZigBee® Solutions
amplifier.ti.com
dataconverter.ti.com
www.dlp.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lprf
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
www.ti.com/wireless
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Copyright © 2009, Texas Instruments Incorporated