TI1 ERJ-3GEY0R00V Contains all support circuitry needed for the ads1148/ads1248 Datasheet

User's Guide
SBAU142B – April 2009 – Revised May 2011
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and
ADS1248EVM-PDK
ADS1248EVM (Left) and ADS1248EVM-PDK (Right)
This user's guide describes the characteristics, operation, and use of the ADS1148EVM and
ADS1248EVM, both by themselves and as part of the ADS1148EVM-PDK or ADS1248EVM-PDK. These
evaluation modules (EVMs) are evaluation boards for the ADS1248, a 24-bit, multi-channel, delta-sigma
analog-to-digital converter (ADC), and the ADS1148, a 16-bit version of the ADS1248. This EVM allows
evaluation of all aspects of the ADS1148 or ADS1248 devices. Complete circuit descriptions, schematic
diagrams, and bills of material are included in this document.
The following related documents are available for download through the Texas Instruments web site at
http://www.ti.com.
EVM-Compatible Device Data Sheets
Device
Literature Number
ADS1148
SBAS453
ADS1248
SBAS426A
REF5020
SBOS410D
OPA227
SBOS110A
TPS3836L30
SLVS292D
TPS79225
SLVS337B
TPS72325
SLVS346B
SN74LVC2G157
SCES207K
PCA9535
SCPS129I
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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Contents
EVM Overview ............................................................................................................... 3
Analog Interface ............................................................................................................. 3
Digital Interface .............................................................................................................. 4
Power Supplies .............................................................................................................. 5
Voltage Reference .......................................................................................................... 6
Clock Source ................................................................................................................ 6
EVM Operation .............................................................................................................. 7
ADS1248EVM-PDK Kit Operation ........................................................................................ 8
Evaluating Performance with the ADCPro Software .................................................................. 17
Schematics and Layout ................................................................................................... 29
List of Figures
1
Reference Select Switch S1 ............................................................................................... 6
2
Jumper J2 .................................................................................................................... 7
3
ADS1248EVM Default Jumper Locations................................................................................ 8
4
Virtual COM Port Installer .................................................................................................. 9
5
Virtual COM Port Setup .................................................................................................... 9
6
MMB3 Switch Locations .................................................................................................. 10
7
Connecting ADS1248EVM to MMB3
8
MMB3 Block Diagram ..................................................................................................... 12
9
ADCPro Software Start-up Display Window ........................................................................... 13
10
ADS1248EVM-PDK Plug-In Display Window .......................................................................... 14
11
Connection Timeout ....................................................................................................... 15
12
Firmware Download Message Box ...................................................................................... 15
13
Firmware Download Progress Indicator ................................................................................ 16
14
Firmware Download Complete Message Box
15
16
17
18
19
20
21
22
23
24
...................................................................................
.........................................................................
ADS1248 Multiplexer......................................................................................................
I/O Config Tab .............................................................................................................
Enabling VBIAS on a Channel ...........................................................................................
GPIO Tab ...................................................................................................................
GPIO Set to Output Mode ................................................................................................
GPIO Output Set to High .................................................................................................
Power & Ref Tab ..........................................................................................................
Cal Tab .....................................................................................................................
About Tab ..................................................................................................................
Progress Bar While Collecting Data ....................................................................................
11
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22
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24
26
27
28
List of Tables
2
1
J8/J4: Analog Interface Pinout ............................................................................................ 4
2
J7: Serial Interface Pins .................................................................................................... 4
3
J11 Configuration: Power-Supply Input .................................................................................. 5
4
J10 Configuration: Power Options ........................................................................................ 5
5
REF1 Reference Voltage Options ........................................................................................ 6
6
List of Switches .............................................................................................................. 8
7
ADS1148EVM/ADS1248EVM Bill of Materials
.......................................................................
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
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EVM Overview
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EVM Overview
1.1
Features
ADS1148EVM/ADS1248EVM Features:
• Contains all support circuitry needed for the ADS1148/ADS1248
• ±2.5V and +5V power-supply options for ADC
• Voltage reference options: external or onboard
• GPIO access
• Compatible with the TI Modular EVM System
ADS1148EVM-PDK/ADS1248EVM-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 ADS1148EVM-PDK or ADS1248EVM-PDK is available. This kit combines
the ADS1148/ADS1248EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™
software for evaluation.
The MMB3 motherboard allows the ADS1148/ADS1248EVM to be connected to the computer via an
available USB port. This manual shows how to use the MMB3 as part of the
ADS1148EVM-PDK/ADS1248EVM-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 ADS1148EVM-PDK/ADS1248EVM-PDK is controlled by a plug-in that runs in ADCPro. For more
information about ADCPro, see the ADCPro™ Analog-to-Digital Converter Evaluation Software User's
Guide (literature number SBAU128), available for download from the TI web site.
This manual covers the operation of both the ADS1148/ADS1248EVM and the
ADS1148EVM-PDK/ADS1248EVM-PDK. Throughout this document, the abbreviation EVM and the term
evaluation module are synonymous with the ADS1148/ADS1248EVM. For clarity of reading, the remainder
of this manual will refer only to the ADS1248EVM or ADS1248EVM-PDK, but operation of the EVM and kit
for the ADS1148 is identical, unless otherwise noted.
1.2
Introduction
The ADS1248EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any modular EVM system interface card.
The ADS1248EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS1248EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the
ADS1248EVM is useful for prototyping designs and firmware.
Note that the ADS1248EVM has no microprocessor and cannot run software. To connect it to a computer,
some type of interface is required.
2
Analog Interface
For maximum flexibility, the ADS1248EVM 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 ADS1248. 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.
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Digital Interface
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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
Pin Number
Signal
Description, ADS1148/ADS1248
J8.1, J4-1
A0(–)
AIN0
J8.2, J4-2
A0(+)
AIN1
J8.3, J4-3
A1(–)
AIN2
J8.4, J4-4
A1(+)
AIN3
J8.5, J4-5
A2(–)
AIN4
J8.6, J4-6
A2(+)
AIN5
J8.7, J4-7
A3(–)
AIN6
J8.8, J4-8
A3(+)
AIN7
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
3
Digital Interface
3.1
Serial Data Interface
Analog ground connections
(except J8.15)
The ADS1248EVM 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
Pin No.
4
Pin Name
Signal Name
I/O Type
Pullup
High
Function
J7.1
CNTL
CS
In
J7.2
GPIO0
START
In
High
J7.3
CLKX
SCLK
In
None
ADS1248 SPI clock
J7.4
DGND
DGND
In/Out
None
Digital ground
J7.5
CLKR
Unused
–
–
J7.6
GPIO1
MR
In
High
J7.7
FSX
Unused
–
–
J7.8
GPIO2
Unused
–
–
J7.9
FSR
DRDY
Out
None
J7.10
DGND
DGND
In/Out
None
Digital ground
Master reset
J7.11
DX
DIN
In
None
ADS1248 SPI data in
J7.12
GPIO3
PWRSEL
In
High
Selects ±2.5V or +5V
supply
J7.13
DR
DOUT/DRDY
Out
None
ADS1248 data out
J7.14
GPIO4
Unused
–
–
J7.15
INT
DRDY
Out
None
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Table 2. J7: Serial Interface Pins (continued)
Pin No.
Pin Name
Signal Name
I/O Type
Pullup
J7.16
SCL
SCL
I2C
High
I2C clock
Function
J7.17
TOUT
CLK
In
None
Can be used to provide
a clock from a
processor
J7.18
DGND
DGND
In/Out
None
Digital ground
J7.19
GPIO5
CLK Select
–
None
J7.20
SDA
SDA
I2C
High
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 ADS1248 pins. See the ADS1248 product data sheet
for complete details on these pins.
4
Power Supplies
J11 is the power-supply input connector. Table 3 lists the configuration details for J11.
Table 3. J11 Configuration: Power-Supply Input
Pin No.
Pin Name
Function
Required
J11.1
+VA
Unused
No
J11.2
–VA
Unused
No
J11.3
+5VA
+5V analog supply
Always
J11.4
–5VA
–5V analog supply
Only in bipolar mode
J11.5
DGND
Digital ground input
Yes
J11.6
AGND
Analog ground input
Yes
J11.7
+1.8VD
1.8V digital supply
No
J11.8
VD1
Unused
No
J11.9
+3.3VD
3.3V digital supply
Always
J11.10
+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.
4.1
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 does not function.
Table 4. J10 Configuration: Power Options
Row
Name
1-2
ADC AVDD
AVDD supply current measurement point for the ADC. Must be
connected for operation.
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.
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Voltage Reference
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Voltage Reference
The ADS1248 device has the option of selecting between three different references: REF0, REF1, and the
internal reference, through registers in the ADS1248 chip. The EVM provides a 2.048V reference for
REF1 from U1, filtered and buffered through U2. This 2.048V may be used to drive the REF1P input.
REF1P 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 (REF1N) 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. REF1 Reference Voltage Options
AVDD
AVSS
J1 Setting
(1)
REF1P
REF1N
REF1
Reference
Voltage
5V
0V
1-2
BUFF
2.048V
0V
2.048V
5V
0V
2-3
BUFF
0V
0V
Invalid
selection
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
S1 Position
(1)
Switch S1 should not be set to AVDD.
The REF0N and REF0P pins are connected directly to the external reference pins on J8.18 and J8.20,
respectively. These pins are diode-clamped to AVDD and AVSS, and protected with D3, a 5.1V zener. If
the external reference pins are not supplied with a external source, REF0N will be at approximately AVSS
+ 0.6V, and REF0P will be at approximately AVDD–0.6V.
The internal reference voltage can be measured between testpoints TP3 (Int REF) and TP5 (REFCOM).
6
Clock Source
The ADS1248 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 J14.1 (ground)
and J14.2 (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 ADS1248 detects that
no external clock is present and enables its internal oscillator.
6.1
Usage in PDK
If using the ADS1248EVM as part of the ADS1248EVM-PDK, J14 should have a jumper installed.
Remove any shorting blocks on jumper J13, and make sure J2 has a jumper between pins 1 and 2 (the IO
position). This configuration grounds the CLK input to the ADS1248 and ensures that the internal oscillator
starts up.
6
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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:
• J13 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 ADS1248EVM.
7.1
Analog Input
Each of the analog input sources 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. Each input has a 47Ω/47pF RC filter in series with it, and
a differential 0.1μF capacitor is placed across each 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 ADS1248EVM
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
ADS1248EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the
ADS1248, 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. ADS1248EVM 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
S1
Left
Switch Description
Onboard reference
ADS1248EVM-PDK Kit Operation
This section provides information on using the ADS1248EVM-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 ADS1248 with the ADS1248EVM-PDK, complete the following steps:
Install the ADCPro software (if not already installed) on a PC.
Install the ADS1248EVM-PDK EVM plug-in software.
Complete the USB driver installation process.
Set up the ADS1248EVM-PDK.
Connect the ADS1248EVM-PDK to the computer with a USB cable.
Run the ADCPro software.
Each task is described in the subsequent sections of this document.
8
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8.1
Installing the ADCPro Software
CAUTION
Do not connect the ADS1248EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS1248EVM-PDK as a connected device.
The CD-ROM shipped with the ADS1248EVM contains an installer for ADCPro as well as an installer for
the ADS1248EVM 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 ADS1248EVM-PDK plug-in, run the file: ads1248evm-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 ADS1248EVM-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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ADS1248EVM-PDK Kit Operation
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Setting Up the ADS1248EVM-PDK
The ADS1248EVM-PDK contains both the ADS1248EVM and the MMB3 motherboard; however, the
devices are shipped unconnected. Follow these steps to set up the ADS1248EVM-PDK.
Step 1. Unpack the ADS1248EVM-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.
10
Plug the ADS1248EVM into the MMB3 as Figure 7 illustrates.
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Figure 7. Connecting ADS1248EVM to MMB3
CAUTION
Do not misalign the pins when plugging the ADS1248EVM 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 ADS1248EVM 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.
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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 ADS1248EVM-PDK at
this time.
The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA
and –5VA and ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA.
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 ADS1248EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3
provides 3.3V and ±5V to the ADS1248EVM.
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 ADS1248EVM-PDK is called ADCPro. This program uses plug-ins to
communicate with the EVM. The ADS1248EVM-PDK plug-in is included in the ADS1248EVM-PDK
package.
12
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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 Section 8.1, Installing the ADCPro Software.
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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ADS1248EVM-PDK Kit Operation
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Step 2.
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Select ADS1248EVM from the EVM drop-down menu. The ADS1248EVM-PDK plug-in
appears in the left pane, as shown in Figure 10.
Figure 10. ADS1248EVM-PDK Plug-In Display Window
Step 3.
14
The ADS1248EVM-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.
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
SBAU142B – April 2009 – Revised May 2011
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ADS1248EVM-PDK Kit Operation
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break
Step 4.
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 ADS1248EVM-PDK, the firmware for the MMB3 may need to be downloaded to
the MMB3. If the firmware needs to be loaded, you will see a screen as shown in Figure 12.
Figure 12. Firmware Download Message Box
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15
ADS1248EVM-PDK Kit Operation
www.ti.com
Switch the BSL switch (SW4) on the MMB3 to the BSL position (to the left) as instructed, then press
OK. The plug-in will download 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 ADS1248 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
16
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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
9
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 ADS1248EVM-PDK Plug-in
The ADS1248EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS1248. It
consists of a tabbed interface (see Figure 16), with different functions available on different tabs. These
controls are described in this section.
You can adjust the ADS1248EVM 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 ADS1248EVM plug-in, the setting immediately updates on the board.
Settings on the ADS1248EVM correspond to settings described in the ADS1248 data sheet (available for
download at www.ti.com) for details.
The ADS1248EVM-PDK plug-in has a tabbed interface, with five different tabs to control the functions of
the ADS1248. These tabs are described below.
SBAU142B – April 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
9.1.1
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I/O Config Tab
This tab is the primary tab that controls the function of the multiplexer in the ADS1248. Recall that the
ADS1248 multiplexer is configured as shown in Figure 15. By default, all channels are set as analog
inputs; the IDACs are not routed to any channel and the IDAC controls are disabled. These controls are
enabled when the correct IDAC settings are made on the Power & Ref tab (see Section 9.1.3).
AVDD
AVDD
IDAC2
IDAC1
System Monitors
AVSS
AVDD
VBIAS
AVDD
(MUXCAL = 001)
AVDD
AIN0
AVSS
AVDD
VBIAS
VREFN
AIN1
ADS1247/48 Only
Temperature
Diode
VREFP
AVSS
AVDD
VREFP1/4
VBIAS
VREFN1/4
VREFP0/4
AIN2
AVSS
AVDD
VREFN0/4
VBIAS
AVDD/4
AIN3
AVSS/4
DVDD/4
ADS1248 Only
AVSS
AVDD
DVSS/4
VBIAS
AIN4
AVDD
AVSS
AVDD
Burnout Current Source
(0.5mA, 2mA, 10mA)
VBIAS
AIN5
AINP
AVSS
AVDD
VBIAS
AVSS
AVDD
VBIAS
AINN
PGA
To
ADC
AIN6
AIN7
Burnout Current Source
(0.5mA, 2mA, 10mA)
AVSS
Figure 15. ADS1248 Multiplexer
The radio buttons at the far right of the panel (see Figure 16) select which pair of inputs are connected to
the PGA. Note that you may select the same input for both the positive (AINP) and negative (AINN) input;
this configuration is often selected to perform a noise test on the ADC itself.
18
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
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Evaluating Performance with the ADCPro Software
Input pins AIN2-AIN7 can be selected to be an analog input or GPIO. If an input is to be used as a GPIO,
check the GPIO box as shown in Figure 16.
Figure 16. I/O Config Tab
When an input is selected as a GPIO, its label turns green and the IDAC controls for that channel are
disabled.
SBAU142B – April 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
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Each input channel can also 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 17, using one channel tied to a value close to ground (make sure you observe the
common-mode restrictions listed in the ADS1248 product data sheet) as a reference for this signal.
Figure 17. Enabling VBIAS on a Channel
The System Monitor button allows you to access the internal system monitor channels of the ADS1248.
When pressed, this button disables the other analog input channel controls, and the system monitor
channel selections are enabled. You can select Offset, Gain, Temperature, VREF1, VREF0, AVDD, or
DVDD as the channel to convert. Note that some of these channels are scaled by a factor when read;
refer to the ADS1248 product 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 to a 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 to Off, or to 0.5μA,
2μA, or 10μA.
The Power Down control powers down the ADS1248. Note that no data can be collected if the Power
Down button is activated.
20
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
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9.1.2
Evaluating Performance with the ADCPro Software
GPIO Tab
When an input is selected to be a GPIO, its controls are enabled on the GPIO tab, shown in Figure 18. By
default, the GPIOs are enabled as inputs. Pressing the Input button reads the state of the enabled inputs;
if the input is high, the corresponding light turns green.
Figure 18. GPIO Tab
SBAU142B – April 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
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To make the GPIO an output, the toggle switch can be switched to output mode, as shown in Figure 19.
Figure 19. GPIO Set to Output Mode
22
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
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Evaluating Performance with the ADCPro Software
With the GPIO configured as an output, the pushbutton switch controls the state of the output pin. When
pressed (as illustrated in Figure 20), the button lights up and the GPIO is set to a high state; when the
switch is dark (as Figure 19 shows), the GPIO is in a low state.
Figure 20. GPIO Output Set to High
SBAU142B – April 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
9.1.3
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Power & Ref Tab
The Power & Ref tab is shown in Figure 21. This tab controls the selection of the power-supply mode,
reference sources, and IDACs.
Figure 21. Power & Ref Tab
Note that with the Internal Reference off, the IDAC controls are disabled, because the IDACs cannot be
used unless the internal reference is turned on.
24
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
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Evaluating Performance with the ADCPro Software
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 Reference Select control selects between VREF0, VREF1, and the Internal Reference. When
VREF1 is selected, 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.
There are two checkboxes that, when enabled, allow the REF0P and REF0N pins to be selected as
GPIOs. These checkboxes are enabled only in modes that allow these pins to be used as GPIOs.
The Internal Reference control selects whether the reference is off, on, or follows the START signal (refer
to the ADS1248 data sheet for more details on these choices). When the internal reference is enabled, the
IDAC controls are enabled as well, because the IDACs cannot function unless the internal reference is
turned on. Note that the internal reference does not necessarily have to be used as the ADC reference in
order to use the IDACs, but it does need to be turned on.
The IDAC Magnitude control sets the amount of current each of the two IDACs provide.
The IDAC0 and IDAC 1 Routing controls allow you to specify where the IDAC0 or IDAC1 current go: to
either the IEXC1 or IEXC2 pins, or to the Analog inputs, or you may turn the IDAC off. If the AIN button is
selected, this option enables the corresponding IDAC controls on the I/O Config tab.
SBAU142B – April 2009 – Revised May 2011
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Evaluating Performance with the ADCPro Software
9.1.4
www.ti.com
Cal Tab
The Cal tab (Figure 22) controls the calibration functions of the ADS1248.
Figure 22. Cal Tab
Pressing the Self Offset Calibrate button causes the ADS1248 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.
26
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
SBAU142B – April 2009 – Revised May 2011
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9.1.5
Evaluating Performance with the ADCPro Software
About Tab
The About tab displays information about the EVM and software, as shown in Figure 23.
Figure 23. 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 ADS1248 ID register.
The Notes indicator may show relevant notes about the plug-in or firmware code, if there are any.
SBAU142B – April 2009 – Revised May 2011
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Copyright © 2009–2011, Texas Instruments Incorporated
27
Evaluating Performance with the ADCPro Software
9.1.6
www.ti.com
Collecting Data
Once you have configured the ADS1248 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
ADS1248EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress
bar as shown in Figure 24.
Figure 24. 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.
28
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
SBAU142B – April 2009 – Revised May 2011
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Schematics and Layout
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9.2
Troubleshooting
If the ADS1248EVM plug-in cannot find the ADS1248EVM-PDK, press the USB RESET button on the
MMB3 (refer to Figure 6) and try again.
If ADCPro stops responding while the ADS1248EVM-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 ADS1148EVM and ADS1248EVM 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 Quality and Eco-Info information on the TI web
site.)
Table 7. ADS1148EVM/ADS1248EVM Bill of Materials
Item No.
Qty
1
1
Value
Ref Des
Vendor
Part Number
Texas
Instruments
6496961
2
4
1μF
C1-C3, C33
Capacitor, X7R Ceramic 1μF ±10%, 16WV,
Size = 0603
TDK
C1608X7R1C105KT
3
2
22μF
C4, C5
Capacitor, X5R Ceramic 22μF ±20%,
16WV, Size = 1210
TDK
C3225X5R1C226MT
4
12
0.1μF
C6-C13, C15, C34,
C35, C36
Capacitor, X7R Ceramic 0.1μF ±10%,
25WV, Size = 0603
TDK
C1608X7R1E104KT
5
1
0.15μF
C14
Capacitor, X7R Ceramic 0.15μF ±10%,
16WV, Size = 0603
Murata
GRM188R71C154KA
01D
6
8
10μF
C16-C23
Capacitor, X5R Ceramic 10μF ±20%,
6.3WV, Size = 0805
TDK
C2012X5R0J106MT
7
8
47pF
C24-C31
Capacitor, C0G Ceramic 47pF ±5%, 50WV,
Size = 0603
TDK
C1608C0G1H470JT
8
1
10nF
C32
Capacitor, C0G Ceramic 10nF ±5%, 25WV,
Size = 0603
TDK
C1608C0G1E103JT
N/A
Description
ADS1248 EVM PWB
9
4
D1, D2, D5, D6
10
2
D3, D4
5.1V, Zener Diode
11
2
J1, J2
Header Strip, 3-pin ( )
12
1
J4
13
4
J5, J6, J13, J14
Header Strip, 2-pin ( )
Samtec
TSW-102-07-L-S
14
2
J7A, J8A
20-pin SMT Plug
Samtec
TSM-110-01-L-DV-P
15
2
J7B, J8B
20-pin SMT Socket
Samtec
SSW-110-22-F-D-VSK
16
1
J9
Terminal Block, 3 position
On Shore
Technology
ED555/3DS
17
1
J10
Header Strip, 10-pin ( )
Samtec
TSW-105-07-L-D
18
1
J11A
10-pin SMT Plug
Samtec
TSM-105-01-L-DV-P
19
1
J11B
10-pin SMT Socket
Samtec
SSW-105-22-F-D-VSK
20
0
J12
21
2
Q1, Q2
MOSFET, P-Channel, 2.5V
Fairchild
FDN302P
22
1
Q3
Enhancement Mode FET, N-Channel
Fairchild
FDN337N
23
1
RA1
Resistor, 8 Thick Film Chip Array 100kΩ,
5%, 63mW
CTS
745C101104JPTR
100kΩ
SBAU142B – April 2009 – Revised May 2011
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DIODE SCHOTTKY 30V 200MA SOT-23
Terminal Block, 9-position
Fairchild
BAT54
On
Semiconductor
MMBZ5231BLT1G
Samtec
TSW-103-07-L-S
On Shore
Technology
ED555/9DS
Header Strip, 6-pin ( )
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright © 2009–2011, Texas Instruments Incorporated
29
Revision History
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Table 7. ADS1148EVM/ADS1248EVM Bill of Materials (continued)
Item No.
Qty
24
0
Value
Ref Des
25
1
10kΩ
R1
26
1
2kΩ
27
10
28
Description
Vendor
Part Number
Resistor, Thick Film Chip 10kΩ, 5%, 1/10W,
Size = 0603
Panasonic
ERJ-3GEYJ103V
R2
Resistor, Thick Film Chip 2kΩ, 1%, 1/16W,
Size = 0603
Panasonic
ERJ-3EKF2001V
47Ω
R3-R12
Resistor, Thick Film Chip 47Ω, 5%, 1/10W,
Size = 0603
Panasonic
ERJ-3GEYJ470V
2
100kΩ
R13, R23
Resistor, Thick Film Chip 100kΩ, 5%,
1/10W, Size = 0603
Panasonic
ERJ-3GEYJ104V
29
4
0Ω
R14, R15, R16, R17
Resistor, Thick Film Chip 0Ω, 5%, 1/10W,
Size = 0603
Panasonic
ERJ-3GEY0R00V
30
1
47kΩ
R18
Resistor, Thick Film Chip 47kΩ, 5%, 1/10W,
Size = 0603
Panasonic
ERJ-3GEYJ473V
31
2
470kΩ
R19, R20
Resistor, Thick Film Chip 470kΩ, 5%,
1/10W, Size = 0603
Panasonic
ERJ-3GEYJ474V
32
2
100Ω
R21, R22
Resistor, Thick Film Chip 100Ω, 5%, 1/10W,
Size = 0603
Panasonic
ERJ-3GEYJ101V
33
2
2.7kΩ
R24, R25
Resistor, Thick Film Chip 2.7kΩ, 5%,
1/10W, Size = 0603
Panasonic
ERJ-3GEYJ272V
34
1
S1
NKK
SS12SDP2
35
0
TP1-TP5
36
1
TP6
PCB Test Point, Large Loop, Through-Hole
Keystone
Electronics
5011
37
1
U1
Precision Voltage Reference, 2.048V
Texas
Instruments
REF5020ID
38
1
U2
Precision Operational Amplifier
Texas
Instruments
OPA227U
39
1
U3
16-Bit I2C I/O Expander
Texas
Instruments
PCA9535RGE
40
1
U4
Inverter, Single Gate
Texas
Instruments
SN74AHCT1G04DBV
R
41
1
U5
Buffer, Open Drain, Single Gate
Texas
Instruments
SN74LVC1G07DBVR
G4
42
1
U6
LDO Voltage Regulator, 2.5V, 100mA
Texas
Instruments
TPS79225DBVRG4
43
1
U7
Single, 2-Line to 1 Data Selector/Multiplexer
Texas
Instruments
SN74LVC2G157DCT
44
0
U8
3.3 V Oscillator
45
1
U9
LDO Voltage Regulator, 2.5V, 200mA
Texas
Instruments
TPS72325DBVTG4
46
1
U10
Precision Delta-Sigma ADC, 24-bit/16-bit
Texas
Instruments
ADS1248IPW/ADS11
48IPW
47
1
U11
EEPROM, 1.8V, 256k
48
1
U12
Supervisor, 2.64V Threshold
49
10
N/A
Shorting Blocks
RA2
Resistor, Chip Array 4 Independent Bus
100kΩ, 5%, 1/16W, SMD
Switch, Mini Slide, SPDT
PCB Test Point, Mini Loop, Through-Hole
Microchip
24AA256-I/ST
Texas
Instruments
TPS3836L30DBVT
Samtec
SNT-100-BK-T
Revision History
Changes from A Revision (July, 2009) to B Revision .................................................................................................... Page
•
Updated Table 3
..........................................................................................................................
5
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
30
Revision History
Copyright © 2009–2011, Texas Instruments Incorporated
SBAU142B – April 2009 – Revised May 2011
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1
2
3
4
5
150nF
7
1
8
1
2
3
TP2
REFP
D5
FRC_BAT54
0.1uF
DVDD
U2
2
R1
10K
C1
1uF
VIN
TEMP
GND
4
VOUT
TRIM
6
C4
22uF
5
47
C5
22uF
C36
C16
10uF
D6
FRC_BAT54
C34
U1
2
3
4
S1
R3
6
OPA227
3
APPROVED
RA1A
100K
AVDD
C6
+5V
ENGINEERING CHANGE NUMBER
C14
+5V
D
REV
DVDD
2K
J1
JPR-1X3
6
REVISION HISTORY
R2
D
0.1uF
U12
5
0.1uF
C15
0.1uF
-5V
R14
0
TP1
AVSS
R15
0
C20
REF5020ID
4
VDD
RESET
CT
GND
MR
1
2
3
TPS3836DBV
10uF
TP3
Int REF
1
47
R12
47
9
B
3
C10
0.1uF
47pF
8
C31
+5V
IN
3
DVDD
+2.5V
U6
J10
5
4
2
OUT
BYP
GND
EN
C11
0.1uF
5
2
5
SN74AHCT1G04DBV
+5V
U4
U5
2
4
4
2
6
5
4
3
2
1
2
R20
470K
4
2
VCC
GND
DVDD
C12
C32
10nF C0G
CRY_C3391-4.096
0.1uF
PCA9535RGE
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
FRC_FDN302P
D3
ONS_MMBZ5231BLT1
1
3
5
7
9
-2.5V
U9
-5VA
2
IN
EN
OUT
BYP
GND
+VA
+5VA
DGND
+1.8VD
+3.3VD
-VA
-5VA
AGND
VD1
+5VD
A0
A1
A2
WP
R13
100K
TP6
GND
C13
0.1uF
C19
10uF
J11A (TOP) = SAM_TSM-105-01-L-DV-P
J11B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
ti
PRECISION ANALOG PRODUCTS
Q3
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA
FRC_FDN337N
FRC_FDN302P
ENGINEER RUSSELL ANDERSON
GND
TITLE
DRAWN BY RUSSELL ANDERSON
DOCUMENT CONTROL NO. 6496962
SHEET
2
C35
0.1uF
MCP_24AA256-I/ST
2
4
6
8
10
+5V
Q2
8
5
6
4
VCC
SDA
SCL
GND
DAUGHTER-POWER
5
4
1
TPS72325DBV
D2
FRC_BAT54
1
2
3
7
2
4
6
HEADER-3X2
J11
DVDD
U11
1
3
5
5.1V
-5V
C33
1uF
1
24
23
22
21
20
19
P13
P14
P15
P16
P17
A0
DVDD
EOH
OUT
J12
D4
ONS_MMBZ5231BLT1
3
J8A (TOP) = SAM_TSM-110-01-L-DV-P
J8B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
C18
10uF
SN74LVC1G07DBV
DAUGHTER-ANALOG
A
1
3
R23
100K
3
D1
FRC_BAT54
RefRef+
U8
OBCLK
Q1
+5V
3
AVDD
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
6
1
2
4
A2
A1
INT
VCC
SDA
SCL
JPR-2X5
TP4
AVDD
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
P06
P07
GND
P10
P11
P12
AVDD
TPS79225DBV
2
4
6
8
10
12
14
16
18
20
VCC A/B
Y
A
Y
B
G
GND
SN74LVC2G157DCT
+3.3V
C2
1uF
1
3
5
7
9
11
13
15
17
19
1
DVDD
VREFP
VREFCOM
REF1P
REF1N
2
JPR-2X1
1
J8
7
8
9
10
11
12
EXT CLK INPUT
U7
J6
47pF
TERMBLOCK-9
R18
47K
1uF
1
TERMBLOCK-3
U3
J14
R19
470K
JPR-1X3
C3
8
5
3
7
100
C30
3
2
1
13
14
15
16
17
18
7
DVDD
R22
2
J13
DVDD
J2
100
47pF
R11
C
J7A (TOP) = SAM_TSM-110-01-L-DV-P
J7B (BOTTOM) = SAM_SSW-110-22-F-D-VS
R21
1
R25
2.7K
SERIALHDR
47
JPR-2X1
J9
C29
2
R24
2.7K
GPIO5
47
6
J5
C9
0.1uF
47pF
R9
5
2
4
R10
U10
ADS1148IPW
ADS1248IPW
C28
3
47
24
28
27
25
26
23
4
TOUT
R8
DGND
47pF
3
AIN4/Iexc/GPIO4
AIN5/Iexc/GPIO5
15
AIN6/Iexc/GPIO6
16
AIN7/Iexc/GPIO7
CLK
14
CS
SCLK
DIN
DRDY
DOUT/DRDY
START
RESET
IOUT2
13
C27
19
47
20
2
18
AVSS
47pF
R7
AIN0/Iexc
AIN1/Iexc
AIN2/Iexc/GPIO2
AIN3/Iexc/GPIO3
IOUT1
12
17
C8
0.1uF
AVDD
C26
21
1
REF0P/GPIO0
REF0N/GPIO1
47
J4
11
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
P05
P04
P03
P02
P01
P00
22
10uF
47pF
R6
C
C23
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
2
4
6
8
10
12
14
16
18
20
1
DVDD
0
1
3
5
7
9
11
13
15
17
19
1
R17
9
10
Ref+
C25
C21
10uF
7
8
47
DVDD
J7
TP5 10uF
REFCOM
0
C7
0.1uF
47pF
R5
C17
R16
Ref-
C24
5
6
47
AVDD
C22
10uF
R4
3
4
5
1
OF 1
SIZE B
ADS1148EVM
ADS1248EVM
DATE
11-Feb-2009
REV
FILE
6
A
A
1
2
3
4
5
REV
DVDD
2K
J1
JPR-1X3
6
REVISION HISTORY
R2
ENGINEERING CHANGE NUMBER
APPROVED
C14
RA1A
100K
AVDD
150nF
+5V
7
1
8
1
2
3
C6
TP2
D5
REFP
FRC_BAT54
0.1uF
U2
2
D
R1
+5V
10K
C1
1uF
VIN
TEMP
GND
4
VOUT
TRIM
6
C4
22uF
5
47
C5
22uF
D
0.1uF
D6
FRC_BAT54
C34
U1
2
3
4
R3
6
OPA227
3
DVDD
C36
U12
5
0.1uF
C15
0.1uF
-5V
4
TP1
AVSS
C20
R14
REF5020ID
0
C16
10uF
R15
VDD
RESET
CT
GND
MR
1
2
3
TPS3836DBV
0
10uF
TP3
Int REF
1
22
1
47
R12
47
9
B
3
C10
0.1uF
47pF
8
C31
+5V
IN
3
DVDD
+2.5V
U6
J10
5
4
2
OUT
BYP
GND
EN
C11
0.1uF
5
2
5
SN74AHCT1G04DBV
+5V
U4
U5
2
4
4
2
6
5
4
3
2
1
2
EOH
OUT
R20
470K
DVDD
4
2
VCC
GND
24
23
22
21
20
19
DVDD
C12
C32
10nF C0G
CRY_C3391-4.096
0.1uF
PCA9535RGE
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
D3
ONS_MMBZ5231BLT1
J12
FRC_FDN302P
1
3
5
7
9
-2.5V
U9
-5VA
2
IN
EN
OUT
BYP
GND
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
1
2
3
7
A0
A1
A2
WP
R13
100K
TP6
GND
C13
0.1uF
C19
10uF
J11A (TOP) = SAM_TSM-105-01-L-DV-P
J11B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
ti
PRECISION ANALOG PRODUCTS
Q3
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA
FRC_FDN337N
FRC_FDN302P
ENGINEER RUSSELL ANDERSON
GND
TITLE
DRAWN BY RUSSELL ANDERSON
DOCUMENT CONTROL NO. 6496962
SHEET
2
C35
0.1uF
MCP_24AA256-I/ST
+5V
Q2
8
5
6
4
VCC
SDA
SCL
GND
DAUGHTER-POWER
5
4
1
TPS72325DBV
D2
FRC_BAT54
+VA
+5VA
DGND
+1.8VD
+3.3VD
DVDD
U11
2
4
6
HEADER-3X2_SPECIAL
J11
5.1V
-5V
C33
1uF
1
A2
A1
INT
VCC
SDA
SCL
P13
P14
P15
P16
P17
A0
1
3
1
3
5
D4
ONS_MMBZ5231BLT1
3
J8A (TOP) = SAM_TSM-110-01-L-DV-P
J8B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
C18
10uF
SN74LVC1G07DBV
DAUGHTER-ANALOG
A
U8
OBCLK
R23
100K
3
D1
FRC_BAT54
RefRef+
6
1
2
4
Q1
+5V
3
AVDD
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
P06
P07
GND
P10
P11
P12
JPR-2X5
TP4
AVDD
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
7
8
9
10
11
12
EXT CLK INPUT
AVDD
TPS79225DBV
2
4
6
8
10
12
14
16
18
20
VCC A/B
Y
A
Y
B
G
GND
SN74LVC2G157DCT
+3.3V
C2
1uF
1
3
5
7
9
11
13
15
17
19
1
DVDD
VREFP
VREFCOM
REF1P
REF1N
2
JPR-2X1
1
J8
R18
47K
U7
J6
47pF
TERMBLOCK-9
U3
J14
R19
470K
1uF
1
TERMBLOCK-3
3
2
1
JPR-1X3
C3
8
5
3
7
100
C30
J13
13
14
15
16
17
18
7
DVDD
R22
2
R25
2.7K
C
DVDD
J2
100
47pF
R11
R24
2.7K
J7A (TOP) = SAM_TSM-110-01-L-DV-P
J7B (BOTTOM) = SAM_SSW-110-22-F-D-VS
R21
1
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
SERIALHDR
47
JPR-2X1
J9
C29
2
2
4
6
8
10
12
14
16
18
20
GPIO5
47
6
J5
C9
0.1uF
47pF
R9
5
2
4
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
R10
U10
ADS1148IPW
ADS1248IPW
C28
3
47
24
28
27
25
26
23
4
TOUT
R8
DGND
47pF
3
AIN4/Iexc/GPIO4
AIN5/Iexc/GPIO5
15
AIN6/Iexc/GPIO6
16
AIN7/Iexc/GPIO7
CLK
14
CS
SCLK
DIN
DRDY
DOUT/DRDY
START
RESET
IOUT2
13
C27
19
47
20
2
18
AVSS
47pF
R7
AIN0/Iexc
AIN1/Iexc
AIN2/Iexc/GPIO2
AIN3/Iexc/GPIO3
IOUT1
12
17
C8
0.1uF
AVDD
C26
21
1
11
REF0P/GPIO0
REF0N/GPIO1
47
J4
C23
10uF
47pF
R6
C
1
3
5
7
9
11
13
15
17
19
P05
P04
P03
P02
P01
P00
DVDD
0
9
10
R17
7
8
Ref+
C25
C21
10uF
5
6
47
DVDD
J7
TP5 10uF
REFCOM
0
C7
0.1uF
47pF
R5
C17
R16
Ref-
C24
1
R4
47
AVDD
C22
10uF
3
4
5
1
OF 1
SIZE B
ADS1148EVM
ADS1248EVM
DATE
31-Jul-2009
REV
FILE
6
B
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
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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It is important to operate this EVM within the input voltage range of –5V to +5V and the output voltage range of 0V to +3.3V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
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