User's Guide
SBAU126C – May 2007 – Revised May 2011
ADS1158EVM, ADS1258EVM, ADS1158EVM-PDK, and
ADS1258EVM-PDK
Figure 1. ADS1258EVM (Left) and ADS1258EVM-PDK (Right)
This user's guide describes the characteristics, operation, and use of the ADS1158EVM and
ADS1258EVM, both separately and as part of the ADS1158EVM-PDK or ADS1258EVM-PDK. These
evaluation modules (EVMs) are evaluation board for the ADS1258 multi-channel, delta-sigma (ΔΣ),
analog-to-digital converter (ADC), and the ADS1158, a 16-bit version of the ADS1258. It allows
evaluation of all aspects of the ADS1158 or ADS1258 device. Complete circuit descriptions, schematic
diagrams, and bills of materials are included in this document.
The related documents listed in Table 1 are available through the Texas Instruments web site at
www.ti.com.
Table 1. EVM-Compatible Device Data Sheets
Device
Literature Number
Device
ADS1158
SBAS429B
TPS79225
Literature Number
SLVS337B
ADS1258
SBAS297D
SN74AHCT1G04
SCLS319N
REF1004
SBVS002
SN74LVC1G07
SCES296V
DAC8571
SLAS373A
TPS72325
SLVS346B
OPA301
SBOS271D
SN74AVC2T45
SCES531J
SN74LVC1G126
SCES224N
SN74AVC8T245
SCES517H
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Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
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Contents
EVM Overview ............................................................................................................... 3
Analog Interface ............................................................................................................. 4
Digital Interface .............................................................................................................. 5
Power Supplies .............................................................................................................. 7
Voltage Reference .......................................................................................................... 8
Clock Source ................................................................................................................ 8
EVM Operation .............................................................................................................. 9
ADS1258EVM-PDK Kit Operation ....................................................................................... 11
Evaluating with the ADCPro Software .................................................................................. 26
Schematics and Layout ................................................................................................... 35
List of Figures
1
ADS1258EVM (Left) and ADS1258EVM-PDK (Right) ................................................................. 1
2
J3 Pin Configuration ........................................................................................................ 6
3
ADS1258EVM Default Jumper Locations .............................................................................. 10
4
MMB0 Initial Setup ........................................................................................................ 12
5
Connecting the ADS1258EVM to the MMB0 .......................................................................... 13
6
Connecting an AC Adapter ............................................................................................... 14
7
Laboratory Power-Supply Connection .................................................................................. 15
8
NI-VISA Driver Installation................................................................................................ 17
9
NI-VISA Driver Installation Question .................................................................................... 18
10
NI-VISA Driver Installing .................................................................................................. 19
11
NI-VISA Driver Complete Installation ................................................................................... 20
12
NI-VISA Driver Verification Using Device Manager ................................................................... 20
13
ADCPro Software Start-up Display Window ........................................................................... 21
14
ADS1258EVM-PDK Plug-In Display Window .......................................................................... 22
15
Install New Driver Wizard Screen 1 ..................................................................................... 23
16
Install New Driver Wizard Screen 2 ..................................................................................... 23
17
Install New Driver Wizard Screen 3 ..................................................................................... 24
18
Install New Driver Wizard Screen 4 ..................................................................................... 24
19
Install New Driver Wizard Screen 5 ..................................................................................... 25
20
USBSytx Driver Verification Using Device Manager .................................................................. 25
21
Mux Settings for Fixed Channel Mode.................................................................................. 27
22
Mux Settings for Auto Channel Mode................................................................................... 28
23
Switch Delay Settings ..................................................................................................... 29
24
External Chopping ......................................................................................................... 29
25
Chopping Settings ......................................................................................................... 30
26
Clock Settings .............................................................................................................. 31
27
GPIO Controls
28
Power and Reference Settings .......................................................................................... 33
29
Progress Bar While Collecting Data
.............................................................................................................
....................................................................................
32
34
List of Tables
2
1
EVM-Compatible Device Data Sheets ................................................................................... 1
2
J1—Analog Interface Pinout ............................................................................................... 4
3
J2—Supplemental Analog Interface Pinout
4
J6—Serial Interface Pins ................................................................................................... 6
5
J5 Configuration—Power-Supply Input
6
J4 Configuration—Power Options ........................................................................................ 7
.............................................................................
..................................................................................
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EVM Overview
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7
Reference Selection ........................................................................................................ 8
8
List of Switches ............................................................................................................ 10
9
ADS1258EVM Bill of Materials
1
EVM Overview
1.1
Features
..........................................................................................
35
ADS1158EVM/ADS1258EVM Features:
• Contains all support circuitry needed for the ADS1158/ADS1258
• Electronically switchable power supply allows both bipolar and unipolar configuration
• Voltage reference options: external or onboard digital-to-analog (DAC)-controlled programmable
reference
• Clock options: ADS1158/ADS1258 built-in PLL-based oscillator or external clock signal
• GPIO access
• Compatible with the TI Modular EVM System
ADS1158EVM-PDK/ADS1258EVM-PDK Features:
• Easy-to-use evaluation software for Microsoft® Windows®
• Data collection to ASCII 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 ADS1158EVM-PDK or ADS1258EVM-PDK is available. This kit combines
the ADS1158EVM/ADS1258EVM board with the DSP-based MMB0 motherboard.
The MMB0 motherboard allows the ADS1158EVM/ADS1258EVM to be connected to the computer via an
available USB port. This manual shows how to use the MMB0 as part of the
ADS1158EVM-PDK/ADS1258EVM-PDK, but does not provide technical detail on the MMB0 itself.
ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based
on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.
The ADS1158EVM-PDK/ADS1258EVM-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 (http://focus.ti.com/lit/ug/sbau128/sbau128.pdf), available for download from the TI web site.
This manual covers the operation of both the ADS1158EVM/ADS1258EVM and the
ADS1158EVM-PDK/ADS1258EVM-PDK. It does not describe the MMB0 motherboard in detail.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the ADS1158EVM/ADS1258EVM. For clarity of reading, this manual will refer only to the ADS1258EVM or
ADS1258EVM-PDK, but operation of the EVM and kit for the ADS1158 is identical, unless otherwise
noted.
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Analog Interface
1.2
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Introduction
The ADS1258EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any Modular EVM System interface card.
The ADS1258EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS1258EVM-PDK, which includes an MMB0 motherboard. As a stand-alone PCB, the ADS1258EVM is
useful for prototyping designs and firmware.
Note that the ADS1258EVM 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 ADS1258EVM 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 J1. This header/socket provides access to the analog input pins of
the ADS1258, as shown in Table 2. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a
variety of mating connector options.
In addition to J1, the J2 header (Samtec part number TSW-108-07-L-D) provides additional analog inputs
to accommodate the large number of input channels available on the ADS1258. Most of the pins on J1
and J2 are directly connected, with no filtering or protection. Use appropriate caution when handling these
pins.
Table 2. J1—Analog Interface Pinout
4
PIN NUMBER
SIGNAL
DESCRIPTION
J1.1
A1
AIN1, ADS1258
J1.2
A0
AIN0, ADS1258
J1.3
A3
AIN3, ADS1258
J1.4
A2
AIN2, ADS1258
J1.5
A5
AIN5, ADS1258
J1.6
A4
AIN4, ADS1258
J1.7
A7
AIN7, ADS1258
AIN6, ADS1258
J1.8
A6
J1.10
J2.11
J1.18
EXTREFN
External reference source input (– side of differential input)
External reference source input (+ side of differential input)
J1.20
EXTREFP
J1.12–J1.16 (even)
Unused
J1.15
Unused
J1.9–J19 (odd)
AGND
Connected to J2, pin 11
Analog ground connections (except J1.15)
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The AINCOM and multiplexer bypass pins are brought to J2, as shown in Table 3. AINCOM is connected
to pin 12 on J2. An additional connection is made between J2.11 and J1.10; as a result of this connection,
if J2.11 and J2.12 are shorted, and J1.9 and J1.10 are shorted, AINCOM is grounded; if only J2.11 and
J2.12 are shorted, AINCOM is available on the EVM analog connector.
The multiplexer bypass is available at J2.13–J2.14 (MUXOUP) and J2.15–J2.16 (MUXOUN). Shorting
these pairs of pins routes the multiplexer output back to the ADCINN and ADCINP pins through a
differential filter. Alternatively, a signal can be applied directly to ADCINN and ADCINP through the filter.
Table 3. J2—Supplemental Analog Interface Pinout
PIN NUMBER
SIGNAL
DESCRIPTION
J2.1–J2.2
GND
Analog ground
J2.3
A8
AIN8, ADS1258
J2.4
A9
AIN9, ADS1258
J2.5
A10
AIN10, ADS1258
J2.6
A11
AIN11, ADS1258
J2.7
A12
AIN12, ADS1258
J2.8
A13
AIN13, ADS1258
J2.9
A14
AIN14, ADS1258
J2.10
A15
AIN15, ADS1258
J2.11
J1.10
Connected to J1, pin 10
J2.12
ACOM
AINCOM, ADS1258
J2.13
ANP
ADCINP, ADS1258
J2.14
MOP
MUXOUP, ADS1258
J2.15
ANN
ADCINN, ADS1258
J2.16
MON
MUXOUN, ADS1258
3
Digital Interface
3.1
Serial Data Interface
The ADS1258EVM 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 J6. This header/socket provides access to the digital control and serial data pins of the
TSC. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector
options.
All logic levels on J6 are 3.3V CMOS, except for the I2C pins, which conform to 3.3V I2C rules. The
ADS1258 may run at different logic levels, as set using J4. All ADS1258 pins are therefore level-shifted.
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Many pins on J6 have weak pull-up resistors. These resistors provide default settings for many of the
control pins. Many pins on J6 correspond directly to ADS1258 pins, as shown in Table 4. See the
ADS1258 data sheet for complete details on these pins.
Table 4. J6—Serial Interface Pins
PIN NUMBER
PIN NAME
SIGNAL NAME
I/O TYPE
PULL-UP
J6.1
CNTL
CNTL
In
None
Optional ADS1258 START pin
control; see text
J6.2
GPIO0
PDWN
In
High
ADS1258 power-down pin
J6.3
CLKX
SCLK
In
None
ADS1258 SPI clock
J6.4
DGND
DGND
In/Out
None
Digital ground
J6.5
CLKR
—
—
None
Unused
J6.6
GPIO1
RST
In
High
ADS1258 reset pin
J6.7
FSX
CS
In
Low
Optional ADS1258 chip-select
control; see text
J6.8
GPIO2
CLKSEL
In
High
Clock select:
0 = internal / out, 1 = external
J6.9
FSR
—
—
None
Unused
J6.10
DGND
DGND
In/Out
None
Digital ground
J6.11
DX
DIN
In
None
ADS1258 SPI data in
J6.12
GPIO3
N/A
In
High
Power-supply mode:
0 = bipolar, 1 = unipolar
J6.13
DR
DOUT
Out
None
ADS1258 SPI data out
J6.14
GPIO4
—
—
None
Unused
J6.15
INT
DRDY
Out
None
ADS1258 data-ready output
J6.16
SCL
SCL
I2C
N/A
I2C clock
J6.17
TOUT
CLK
In
None
External clock input
J6.18
DGND
DGND
In/Out
None
Digital ground
J6.19
GPIO5
—
—
None
Unused
N/A
I2C data
J6.20
3.2
FUNCTION
SDA
2
SDA
IC
GPIO
G4
G2
G0
ST
J6-1
4
6
8
10
12
G6
2
The GPIO connector, J3, carries the GPIO pins for the ADS1258. J3 is arranged so that GPIO0 and
GPIO1 can be used to control START and CS, respectively; see Figure 2 and Figure 5. The PDK firmware
controls START through GPIO0. CNTL(J6-1) and FSX(J6-7) are also brought to J3, so they can also be
used to control START and CS. Both FSX and CNTL are pulled down, so these pins can be used to keep
START and CS low if they are not to be used.
9
7
G1
11
5
G3
CS
3
G5
J6-7
1
12
2
G7
11
1
Figure 2. J3 Pin Configuration
6
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Power Supplies
J5 is the power-supply input connector, as shown in Table 5.
Table 5. J5 Configuration—Power-Supply Input
4.1
PIN NUMBER
PIN NAME
FUNCTION
REQUIRED?
J5.1
+VA
Not used
No
J5.2
–VA
Not used
No
J5.3
+5VA
+5V analog supply
Always
J5.4
–5VA
–5V analog supply
Only in bipolar mode
J5.5
DGND
Digital ground input
Only if DGND is selected on J4
J5.6
AGND
Analog ground input
Only if AGND is selected on J4
J5.7
+1.8VD
1.8V digital supply
Only if 1.8V is selected on J4
J5.8
VD1
Not used
No
J5.9
+3.3VD
3.3V digital supply
Always
J5.10
+5VD
Not used
No
Power Options
J4 is arranged as seven rows, each of which can be shorted, as shown in Table 6. For normal operation,
J4.1-2, J4.3-4, and J4.9-10 must be connected (directly or through an ammeter); either J4.5-6 or J4.7-8
must be connected, and either (or both) of J4.11-12 and J4.13-14 must be connected; otherwise, the
board will not function.
Table 6. J4 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
1.8V select
When shorted, DVDD is sourced from the 1.8V power-supply input pin.
Should not be connected at the same time as 7-8.
7-8
3.3V select
When shorted, DVDD is sourced from the 3.3V power-supply input pin.
Should not be connected at the same time as 5-6.
9-10
ADC DVDD
DVDD supply current measurement point for the ADC.
Must be connected for operation.
11-12
DGND
Connects DGND to board ground.
13-14
AGND
Connects AGND to board ground.
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Voltage Reference
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Voltage Reference
The ADS1258EVM has a DAC-controlled voltage reference circuit. The DAC used is a TI DAC8571,
controlled through the I2C. The address is set to 1001100. The output of the DAC is multiplied by two,
giving a range of approximately 0V to 5V. The DAC circuit is designed for low drift, but is uncalibrated. For
absolute accuracy, measure the DAC output and adjust as needed. The DAC high resolution reduces the
need for mechanical trimming.
Because of the high capacitance load on the buffer amplifier, the DAC step must be limited. The code
must not be changed by more than one at a time. (The PDK firmware incorporates a stepper task that
limits the slew-rate of the DAC by software.) If the DAC step is too high, the circuit saturates at a certain
voltage. To reset the circuit, return the DAC output to 0V.
Switches S1 and S2 allow various combinations of the DAC, external supply pins, and the power supply to
be selected, as shown in Table 7.
Table 7. Reference Selection
6
POSITION
S1 REFP
S2 REFN
Left
AVDD
AVSS
Center
DAC
GND
Right
EXTREFP (J1.20)
EXTREFN (J1.18)
Clock Source
The ADS1258 can use either an internal PLL-based clock source or an externally supplied clock. The
ADS1258EVM supports either type of clock.
For PLL operation, the ADS1258EVM is supplied with a 32.768kHz crystal. This clock mode is selected by
pulling GPIO2 on J6 (pin 8) low. In this mode, the generated clock can be measured on TP1, if the proper
bit is set in the ADS1258. The clock does not interfere with TOUT.
For external operation, a clock signal must be supplied on TOUT on J6 (pin 17), and GPIO2 must be
driven high. The level-shifted clock can be measured at TP1.
8
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7
EVM Operation
The following sections provide information on the analog input, digital control, and general operating
conditions of the ADS1258EVM.
7.1
Analog Input
The analog input sources can be applied directly to J1 (top or bottom side) or through signal-conditioning
modules available for the the modular EVM system. Signals can be applied directly to J2 for the additional
available channels.
7.2
Digital Control
The digital control signals can be applied directly to J6 (top or bottom side). The modular ADS1258EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6KInterface or
HPA-MCUInterface boards available from Texas Instruments, or the MMB0 if purchased as part of the
ADS!258EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM, the ADS1258,
or the ADS1158, see the relevant product folder on the TI web site (www.ti.com).
7.3
Power Supply
The ADS1258 device can operate in either unipolar or bipolar mode. The ADS1258EVM can therefore
function in one of two power-supply configurations, unipolar or bipolar.
• In unipolar mode, the ADS1258 device uses a 5V analog supply. No negative power supply is needed
in this mode. The PDK requires a +5V dc supply that can be derived from a wall-mount power adapter.
• In bipolar mode, the ADS1258 is powered from a ±2.5V dual supply. This configuration requires both
a +5V supply and a –5V supply.
The power-supply mode is selected using GPIO3 (pin 12) on J6 of the ADS1258EVM. If this pin is low, the
mode is bipolar; if high, the mode is unipolar. This pin is pulled high when nothing is connected.
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EVM Operation
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Default Jumper Settings and Switch Positions
Figure 3 shows the jumpers found on the EVM and the factory default conditions for each one.
Figure 3. ADS1258EVM Default Jumper Locations
The jumpers on J4 provide a convenient way to measure the current for any of the power-supply currents:
AVDD (analog +V power), DVDD (digital power), AVSS (analog –V power), or the ground connections
VGND and DGND. Simply remove the jumper for the appropriate power supply and use a current meter
between the jumper pins. The supply voltage for the digital supply (DVDD) can also be selected to be
either 1.8V or 3.3V; see Table 6.
Table 8 provides a list of switches found on the EVM and the factory default conditions for each one.
Table 8. List of Switches
10
SWITCH
DEFAULT POSITION
S1
Left
REF positive
S2
Left
REF negative
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SWITCH DESCRIPTION
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8
ADS1258EVM-PDK Kit Operation
This section provides information on using the ADS1258EVM-PDK, including setup, program installation,
and program usage.
To prepare
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
to evaluate the ADS1258 with the ADS1258EVM-PDK, complete the following steps:
Install the ADCPro software (if not already installed).
Install the ADS1258EVM-PDK EVM plug-in software.
Set up the ADS1258EVM-PDK.
Connect a proper power supply or use the included ac adapter.
Complete the NI-VISA USB driver installation process.
Run the ADCPro software.
Complete the Microsoft Windows USB driver installation process.
Each task is described in the subsequent sections of this document.
8.1
Installing the ADCPro Software
CAUTION
Do not connect the ADS1258EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS1258EVM-PDK.
The latest software is available from the TI website at
ftp://ftp.ti.com/pub/data_acquisition/ADCPro/Plugins/ads1158evm-pdk-plugin-1.2.0.exe. The ADCPro
installer will check for updates when executed (if connected to the Internet), and then give you the option
of downloading and installing the latest version. Refer to the ADCPro User Guide for instructions on
installing and using ADCPro.
To install the ADS1258EVM-PDK plug-in, run the file: ads1258evm-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 ADS1258EVM-PDK plug-in, once you have
installed one version of it.
The software should now be installed, but the USB drivers may not yet have been loaded by the PC
operating system. This step will complete when the ADCPro software is executed; see Section 8.5,
Running the Software and Completing Driver Installation.
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8.2
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Setting Up the ADS1258EVM-PDK
The ADS1258EVM-PDK contains both the ADS1258EVM and the MMB0 motherboard; however, the
devices are shipped unconnected. Follow these steps to set up the ADS1258EVM-PDK:
Step 1. Unpack the ADS1258EVM-PDK kit.
Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 4:
• Set the Boot Mode switch to USB.
• Connect +5V and +5VA on jumper block J13 (if +5V is supplied from +5VA).
• Leave +5V and +VA disconnected on jumper block J13.
• If the PDK will be powered from an ac adapter, and used in unipolar mode, connect J12.
If the PDK will be powered through the terminal block or will be used in bipolar mode,
disconnect J12. (See Section 8.4 for details on connecting the power supply.)
J12
S4
WALL SUPPLY CONNECTION
BOOT MODE SWITCH
CONNECT IF NEEDED.
SEE TEXT.
J13
POWER
SUPPLY
CONFIG
Figure 4. MMB0 Initial Setup
12
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3. Plug the ADS1258EVM into the MMB0, as shown in Figure 5.
Figure 5. Connecting the ADS1258EVM to the MMB0
CAUTION
Do not misalign the pins when plugging the ADS1258EVM into the MMB0.
Check the pin alignment carefully before applying power to the PDK.
Step 3.
8.3
Set the jumpers and switches on the ADS1258EVM as illustrated in Figure 3 (note that these
settings are the factory-configured settings for the EVM):
• Set jumper block J4 as illustrated in Figure 3.
• Set the reference source select switches S1 and S2 to the center position.
• Set up jumper block J3 as illustrated in Figure 3.
About the MMB0
The MMB0 is a Modular EVM System motherboard. It is designed around the TMS320VC5507, a DSP
from Texas Instruments that has an onboard USB interface. The MMB0 also has 16MB of SDRAM
installed.
The MMB0 is not sold as a DSP development board, and it is not available separately. TI cannot offer
support for the MMB0 except as part of an EVM kit. For schematics or other information about the MMB0,
contact Texas Instruments.
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Connecting the Power Supply
The ADS1258EVM-PDK can be operated with a unipolar +5V supply or a bipolar ±5V supply.
If the ADS1258EVM-PDK is to be operated in unipolar mode only, either an ac adapter or a lab power
supply can be used. If the ADS1258EVM-PDK is to be operated in bipolar mode, a ±5V power supply
must be connected; an ac adapter cannot be used.
When the MMB0 DSP is powered properly, LED D2 glows green. The green light indicates that the 3.3V
supply for the MMB0 is operating properly. (It does not indicate that the EVM power supplies are
operating properly.)
8.4.1
Connecting an AC Adapter
An ac adapter can be connected to barrel jack J2 on the MMB0. J2 is located next to the USB connector.
The adapter must output 6V–9V dc. The connector must be sleeve-negative, tip-positive. It should have a
current rating of at least 500mA, as shown in Figure 6.
When an ac adapter is used, the ADS1258EVM cannot be used in bipolar mode.
Jumper J12 on the MMB0 connects a wall-mounted power supply to the board. To use the wall-mount
supply, J12 must be shorted.
J2
J12
AC ADAPTER INPUT
WALL SUPPLY CONNECTION
J13
POWER
SUPPLY
CONFIG
Figure 6. Connecting an AC Adapter
14
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8.4.2
Connecting a Laboratory Power Supply
A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in
Figure 7. Both unipolar and bipolar configurations are supported.
To
•
•
•
use a unipolar lab power-supply configuration:
Disconnect J12 on the MMB0.
Connect a +5V dc supply to the +5VD terminal on J14.
Connect ground of the dc supply to the GND terminal on J14.
For bipolar mode, also connect a –5V dc supply to the –5VA terminal on J14.
It is not necessary to connect +5V dc supply voltage to the +5VA terminal on J14 if the +5V/+5VA position
on J13 is shorted.
J12
WALL SUPPLY CONNECTION
J13
POWER
SUPPLY
CONFIG
J14
POWER
GND
+5VDC
(OPTIONAL) -5VDC
INPUT
Figure 7. Laboratory Power-Supply Connection
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ADS1258EVM-PDK Kit Operation
8.5
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Running the Software and Completing Driver Installation
NOTE: The software is continually under development. These instructions and screen images are
current at the time of this writing, but may not exactly match future releases.
The program for evaluating the ADS1258EVM-PDK is called ADCPro. This program uses plug-ins to
communicate with the EVM. The ADS1258EVM-PDK plug-in is included in the ADS1258EVM-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
complete the necessary driver installation. Make sure the ADCPro software and device plug-in software
are installed from the CD-ROM as described in Section 8.1, Installing the ADCPro Software.
8.5.1
NI-VISA USB Device Driver Installation
1. After the ADCPro software is installed, apply power to the PDK and connect the board to an available
PC USB port.
2. The computer should recognize new hardware and begin installing the drivers for the hardware.
Figure 8 through Figure 11 are provided for reference to show the installation steps.
• For the first screen, Figure 8, it is not necessary to search for the software; it has already been
installed to your PC.
• For the remaining steps, accept the default settings.
16
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Figure 8. NI-VISA Driver Installation
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Figure 9. NI-VISA Driver Installation Question
18
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Figure 10. NI-VISA Driver Installing
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Figure 11. NI-VISA Driver Complete Installation
This should complete the installation of the NI-VISA drivers. You can verify proper installation by opening
the Device Manager and locating the driver as shown in Figure 12.
Figure 12. NI-VISA Driver Verification Using Device Manager
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8.5.2
USBStyx Driver Installation
1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 13
appears.
Figure 13. ADCPro Software Start-up Display Window
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2. Select ADS1258EVM from the EVM drop-down menu. The ADS1258EVM-PDK plug-in appears in the
left pane, as shown in Figure 14.
Figure 14. ADS1258EVM-PDK Plug-In Display Window
3. The ADS1258EVM-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.
4. If you have not yet loaded the operating system drivers, Windows will display the Windows Install New
Driver Wizard sequence (illustrated in Figure 15 through Figure 19). Accept the default settings.
NOTE: During the driver installation, a message may appear indicating the firmware load has
TIMED OUT. Click OK and continue driver installation. The plug-in will attempt to download
the firmware again once the driver installation completes.
22
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Figure 15. Install New Driver Wizard Screen 1
Figure 16. Install New Driver Wizard Screen 2
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Figure 17. Install New Driver Wizard Screen 3
Figure 18. Install New Driver Wizard Screen 4
24
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Figure 19. Install New Driver Wizard Screen 5
5. Once Windows finishes installing the software driver, the plug-in downloads the firmware to the MMB0.
The status area will display Connected to EVM when the device is connected and ready to use. If the
firmware does not load properly, you can try resetting the MMB0 by pressing reset and then reloading
the plug-in.
6. You can verify the proper installation of the USBStyx driver using the Device Manager. Note that the
first driver item, NI-VISA USB Devices, will disappear and a new item, LibUSB-Win32 Devices will
appear, as Figure 20 shows.
Figure 20. USBSytx Driver Verification Using Device Manager
The driver installation wizard sequence should not appear again, unless you connect the board to a
different USB port.
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Evaluating with the ADCPro Software
9
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Evaluating with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The
ADS1258EVM plug-in is installed as described in the installation section.)
To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM
menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option
from the corresponding menu.
Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous
plug-in is unloaded.
9.1
Using the ADS1258EVM-PDK Plugin
The ADS1258EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS1258. It
consists of a tabbed interface (see Figure 25), with different functions available on different tabs. These
controls are described in this section.
You can adjust the ADS1258EVM 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 ADS1258EVM
plug-in, the setting is immediately updated on the board. If you unload and reload the plug-in, the software
will try to load settings from the board. Settings on the ADS1258EVM correspond to settings described in
the ADS1258 data sheet; see the ADS1258 data sheet for details.
Because the effective data rate of the ADS1258 depends upon settings of the multiplexer mode, clocks,
switch time delay, chopping, and averages, the Effective Data Rate indicator in the upper right corner of
the plug-in interface is always visible and updated whenever a setting that effects the data rate is
changed. In the upper left corner, the Averages control sets the ADS1258 averaging mode. This may be
set to 1, 4, 16, or 64. Note that this is a setting for the ADS1258 device itself; no software averaging is
done in the ADS1258EVM-PDK plug-in.
26
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9.1.1
MUX Tab
The ADS1258 multiplexer can work in two modes, selected by the controls Fixed Channel or Auto Scan.
When set to Fixed Channel mode, the screen will appear as shown in Figure 21.
Figure 21. Mux Settings for Fixed Channel Mode
On the Fixed Channel tab, the AINP and AINN of the ADS1258 are connected to the pins selected by the
radio buttons. In Figure 18, these are both set to AIN0—not a useful setting for measuring an input signal,
but quite commonly used for noise testing of the ADS1258. Any channel may be referenced to any other
channel; for example, if AINP were set to AIN1, and AINN were set to AIN0, then the signal could be
applied between AIN1 and AIN0.
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When set to Auto Scan mode, the screen appears as shown in Figure 22. In this mode, the ADS1258
scans through all of the channels selected by checking the box next to the channel name. Note that the
AIN channels are single-ended channels, referred to AINCOM. See the ADS1258 data sheet for details on
all of the channel configurations. Also notice when changing from Fixed Channel mode to Auto Scan
mode, the data rate will be changed to match the limits of the ADS1258.
Figure 22. Mux Settings for Auto Channel Mode
28
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The ADS1258 switch time delay can be set on the Switch Time Delay tab shown in Figure 23. This
setting has effect only when in Auto Scan mode. The delay time can be set on this screen, from no delay
(0μs) to 384μs.
Figure 23. Switch Delay Settings
Through the use of the External Chopping mode, the ADS1258 can remove the offset which might be
introduced by signal conditioning circuits. It makes two measurements, which means the sampling rate is
half as fast. After the first measurement, the polarity is swapped and the second measurement is made.
The ADS1258 averages the two readings, canceling the offset as shown in Figure 24.
Multiplexer
(chopping)
MUXOUTP
AINn
ADCINP
Optional
Signal
Conditioning
ADC
AINn
MUXOUTN
ADCINN
Figure 24. External Chopping
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This action can be enabled on the Chopping tab shown in Figure 25.
Figure 25. Chopping Settings
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9.1.2
Clocks Tab
The ADS1258 requires a clock to operate. This clock may be selected on this tab, as shown in Figure 26,
using the Clock Source controls.
Figure 26. Clock Settings
The ADS1258 can operate from a 32kHz crystal, and using an internal PLL, generate a 15.729MHz clock.
If the Internal setting is selected, this frequency is displayed in the Clock Frequency control.
When MMB0 is selected, a 4MHz to 20MHz clock is supplied to the ADS1258EVM. The default frequency
is 16MHz, but it can be adjusted in the Clock Frequency control.
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9.1.3
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GPIO Tab
The GPIO Tab (shown in Figure 27) allows control of the ADS1258 GPIO pins. Down the center of this
screen, the I/O Mode switches set whether each GPIO pin is an input or an output.
Figure 27. GPIO Controls
When selected as outputs, the Output buttons set the state of the GPIO pins; when pressed and lit, the
pin will be driven high; when unlit, the pin will be driven low.
If selected as inputs, the LED indicators next on the right hand side of the screen will display the state of
the pin (lit for HIGH and unlit for LOW). The state of the GPIO pins is sampled only when the Input button
is pressed—in other words, the display will only update when this pin is pressed.
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9.1.4
Power and Ref Tab
On this tab (shown in Figure 28), the power-supply mode for the ADS1258 may be selected. As explained
earlier, the bipolar mode requires both a +5V and a –5V power supply and the appropriate jumper
selections on the MMB0, so bipolar mode cannot be selected here if you are using an ac adaptor. With the
appropriate power connections, the Power supply can be set to either Unipolar or Bipolar.
The ADS1258 Idle mode can be selected to be either Standby (low power, fast startup), or Sleep (lowest
power).
The VREF Source voltage can either come from an External voltage or you can choose DAC and specify
the VREF voltage (up to 5V).
When enabled, the Sensor Bias Current Sources (SBCS) can be set for either 1.5μA or 24μA.
Figure 28. Power and Reference Settings
The Low Supply indicator will indicate that the analog supply voltage (AVDD – AVSS) is less than about
4.3V.
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Collecting Data
Once you have configured the ADS1258 for your test scenario, pressing ADCPro's Acquire button will
start the collection of the number of data points specified in the Test plug-in Block Size control. The
ADS1258EVM-PDK plug-in will disable all the front panel controls while acquiring, and display a progress
bar as shown in Figure 29.
Figure 29. Progress Bar While Collecting Data
For more information on testing ADCs in general and using ADCPro and Test plug-ins, refer to the
ADCPro user guide.
9.2
Troubleshooting
If ADCPro stops responding while the ADS1258EVM-PDK is connected, try unplugging the power supply
from the PDK. Unload and reload the plug-in before reapplying power to the PDK.
34
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10
Schematics and Layout
Schematics for the ADS1258EVM are appended to this user's guide. The bill of materials is provided in
Table 9.
10.1 Bill of Materials
NOTE: All components should be RoHS-compliant. Some part numbers may be either leaded or
RoHS. Verify that purchased components are RoHS-compliant.
Table 9. ADS1258EVM Bill of Materials
Item No.
Qty
Value
1
2
0
R11, R12
Ref Des
Resistor, Thick Film Chip, 0Ω, 5%,
1/4W, Size = 1206
Panasonic
ERJ-8GEY0R00V
2
1
20
R5
Resistor, Thick Film Chip, 20Ω,
5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ200V
3
2
1k
R3, R4
Resistor, Metal Film Chip, 1kΩ,
0.1%, 1/16W, Size = 0603
Panasonic
ERA-3YEB102V
4
2
10k
R1, R2
Resistor, Thick Film Chip, 10kΩ,
5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ103V
5
7
100k
R6–R10, R13,
R14
Resistor, Thick Film Chip, 100kΩ,
5%, 1/10W, Size = 0603
Panasonic
ERJ-3GEYJ104V
6
2
4.7pF
C25, C26
Capacitor, C0G Ceramic, 4.7pF
±5%, 50WV, Size = 0603
TDK
C1608C0G1H047JT
7
1
2200pF
C24
Capacitor, C0G Ceramic, 2200pF
±5%, 630WV, Size = 1206
TDK
C3216C0G2J222JT
8
1
22000pF
C6
Capacitor, X7R Ceramic, 22000pF
±1%, 50WV, Size = 0603
TDK
C1608X7R1H223KT
9
11
0.1μF
C1–C5, C7, C8, Capacitor, X7R Ceramic, 0.1μF
C18–C21
±10%, 50WV, Size = 0603
TDK
C1608X7R1H104KT
10
5
1μF
C12–C16
Capacitor, X7R Ceramic, 1μF
±10%, 16WV, Size = 0603
TDK
C1608X7R1C105KT
11
3
10μF
C9–C11
Capacitor, X5R Ceramic, 10μF
±20%, 16WV, Size = 1206
TDK
C3216X5R1C106MT
12
1
220μF
C17
Chip Capacitor, Low ESR
Tantalum 220uF ±10%, 10WV,
Size = V
Kemet
T495D227K010ATE125
Not Installed
2
C22, C23
Capacitor, Ceramic, Size = 1206
13
1
U4
Precision Delta-Sigma ADC, 16
Input, 16-bit or 24-bit
Texas Instruments
ADS1158IRTCTG4 or
ADS1258IRTCTG4
14
1
U1
Precision Voltage Reference, 2.5V
Texas Instruments
REF1004I-2.5
15
1
U2
DAC, 16-bit, Low Power
Texas Instruments
DAC8571IDGKG4
16
1
U3
Operational Amplifier
Texas Instruments
OPA301AIDBVRG4
17
1
U5
Buffer, Tri-State, Single Gate
Texas Instruments
SN74LVC1G126DBVRG4
18
1
U6
LDO Voltage Regulator, 2.5V,
100mA
Texas Instruments
TPS79225DBVRG4
19
1
U7
Inverter, Single Gate
Texas Instruments
SN74AHCT1G04DBVR
20
1
U8
Buffer, Open Drain, Single Gate
Texas Instruments
SN74LVC1G07DBVRG4
21
1
U9
LDO Voltage Regulator, 2.5V,
200mA
Texas Instruments
TPS72325DBVTG4
22
1
U11
Dual Split Rail Level Shifter
Transceiver
Texas Instruments
SN74AVC2T45DCT
23
1
U12
Bus Transceiver, 8-bit, Level
Translator
Texas Instruments
SN74AVC8T245RHLRG4
24
2
J1A, J6A
20-pin SMT Plug
Samtec
TSM-110-01-L-DV-P
25
2
J1B, J6B
20-pin SMT Socket
Samtec
SSW-110-22-F-D-VS-K
26
1
J5A
10-pin SMT Plug
Samtec
TSM-105-01-L-DV-P
27
1
J5B
10-pin SMT Socket
Samtec
SSW-105-22-F-D-VS-K
28
1
J2
Header Strip, 16 pin
Samtec
TSW-108-07-L-D
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Table 9. ADS1258EVM Bill of Materials (continued)
Item No.
Qty
29
1
J4
Header Strip, 14-pin
Samtec
TSW-107-07-L-D
30
1
J3
Header Strip, 12-pin
Samtec
TSW-106-07-L-D
31
1
N/A
ADS1258EVM PWB
Texas Instruments
6474410
32
2
D1, D2
Schottky Diode
Fairchild
BAT54
33
1
D3
5.1V, Zener Diode
On Semiconductor
MMBZ5231BLT1G
Not Installed
1
D4
5.1V, Zener Diode
On Semiconductor
MMBZ5231BLT1G
34
2
Q1, Q3
MOSFET, P-Channel, 2.5V
Fairchild
Semiconductor
FDN302P
35
1
Q2
Enhancement Mode FET,
N-Channel
Fairchild
Semiconductor
FDN337N
36
2
S1, S2
Single Pole - Triple Throw Switch
NKK
SS14MDP2
Not Installed
2
TP1, TP2
PCB Test Point, Miniature,
Through-Hole
Keystone
Electronics
5000
X1
Quartz Crystal
Epson Electronics
C-001R 32.7680K-A:PBFREE
N/A
Shorting Blocks
Samtec
SNT-100-BK-G-H
37
1
38
10
Value
32.678kHz
Ref Des
Description
Vendor
Part Number
Revision History
Changes from B Revision (October, 2008) to C Revision .............................................................................................. Page
•
•
•
Revised front-page figure ................................................................................................................ 1
Updated Table 5 .......................................................................................................................... 7
Updated Section 8.1 to reflect software availability through FTP site ............................................................ 11
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
36
Revision History
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1
2
3
4
5
6
REVISION HISTORY
REV
ENGINEERING CHANGE NUMBER
APPROVED
J3
1
3
5
7
9
11
D
C12
4
SCL
SDA
0.1U
R3
R4
1K 0.1%
1K 0.1%
+5V
S1
+3.3V
VDD
VREF
VSENSE
VOUT
5
NKK_SS14MDP2
1
2
3
4
S2
4
1 R5
3
DAC8571IDGK
C4
0.1U
C3
0.1U
20
U3
OPA301AIDBV
2
U2
TP2
OBREF
C17
220U
NKK_SS14MDP2
C13
1U
DVDD
GPIO5
C25
DVDD
1
4.7pF
TP1
4
C26
4.7pF
EPS_C-001R
C6
C21
0.1U
CNTL_S
FSX_S
GPIO7
CS
SCLK
DIN
DOUT
DRDY
START
PDWN
RST
CLKSEL
CLK
XTAL1
XTAL2 X1
29
C19
0.1U
0.1U
U5
22N
VCCA
A1
A2
GND
C20
3
4
5
6
7
8
9
10
11
12
13
R8
100K
+3.3V
VCCA
23
24
21
20
19
18
17
16
15
14
2
22
VCCB
VCCB
B1
B2
B3
B4
B5
B6
B7
B8
DIR
OE
A1
A2
A3
A4
A5
A6
A7
A8
GND
GND
GND
R2
10K
J6A
FSX
R13
100K
SN74AVC8T245RHL
2
R9
100K
0.1U
U12
1
+3.3V
8
7
6
5
VCCB
B1
B2
DIR
SN74AVC2T45DCT
GPIO3
CNTL 1
CLKX 3
5
7
9
DX
11
DR
13
INT
15
17
TOUT
19
R14
100K
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
2
4
6
8
10
12
14
16 SCL
18
20 SDA
+3.3V
R10
100K
C
DAUGHTER-SERIAL
J6A (TOP) = SAM_TSM-110-01-L-DV-P
J6B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
+3.3V+1.8V
SN74LVC1G126DBV
DVDD
+5V
IN
3
C15
1U
EN
OUT
BYP
GND
5
4
2
C8
0.1U
TPS79225DBV
C10
10U
+5V
U7
SN74AHCT1G04DBV
2
4
+5V
2
Q1
FRC_FDN302P
R6
100K
U8
JUMPER FUNCTIONS
J4
U6
1
5
C9
10U
C2
A0
SCL
SDA
GND
C23
DNP
GPIO1
1
3
5
7
9
11
13
2
4
6
8
10
12
14
ADC AVDD
ADC AVSS
DIGITAL=1.8V
DIGITAL=3.3V
ADC DVDD
DGND
AGND
JPR-2X7
4
J5A
SN74LVC1G07DBV
1
3
5
7
9
3
8
6
U1
REF1004I-2.5
5
6
7
8
C24 2.2nF
C22
DNP
DGND
1
2
3
4
1U
5
R11 0R
+5V
R1
C5
0.1U
D2
FRC_BAT54
0R
D3
J1A (TOP) = SAM_TSM-110-01-L-DV-P
J1B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K
28
14
15
16
17
18
19
20
21
27
22
23
24
25
26
10
11
12
13
8
9
7
C18
+3.3V
U11
C14
TOUT_S
R12
HEADER-6X2
5
HEADER-8X2
DAUGHTER-ANALOG
10K
C1
0.1U
2
4
6
8
10
12
14
16
DVDD
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
CS
SCLK
DIN
DOUT
DRDY
START
PDWN
RST
CLKSEL
CLKIN/CLKOUT
XTAL1
XTAL2
PLLCAP
3
1
3
5
7
9
11
13
15
ONS_MMBZ5231BLT1
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
D1
FRC_BAT54
C
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
J2
2
4
6
8
10
12
14
16
18
20
AVDD
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
AIN8
AIN9
AIN10
AIN11
AIN12
AIN13
AIN14
AIN15
AINCOM
MUXOUN
MUXOUP
ADCINN
ADCINP
VREFN
VREFP
AVSS
D
DVDD
3
J1A
1
3
5
7
9
11
13
15
17
19
6
4
3
2
1
48
47
46
45
40
39
38
37
36
35
34
33
32
43
44
41
42
30
31
5
ADS1258IRTC
D4
ONS_MMBZ5231BLT1
U4
GPIO6
GPIO4
GPIO2
GPIO0
1U
2
4
6
8
10
12
U9
B
2
3
IN
EN
C16 1U
OUT
BYP
GND
TPS72325DBV
+VA
+5VA
DGND
+1.8VD
+3.3VD
-VA
-5VA
AGND
VD1
+5VD
2
4
6
8
10
B
DAUGHTER-POWER
5
4
1
C11
10U
C7
0.1U
J5A (TOP) = SAM_TSM-105-01-L-DV-P
J5B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
+5V
Q3
R7
100K
Q2
FRC_FDN337N
FRC_FDN302P
0 = +/- 2.5V
1 = 0V - 5V
ti
A
DATA ACQUISITION PRODUCTS
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
6730 SOUTH TUCSON BLVD., TUCSON, AZ 85706 USA
TITLE
ENGINEER M. P. ASHTON
ADS1258EVM
DRAWN BY M. P. ASHTON
DOCUMENT CONTROL NO. 6474411
SHEET
1
2
3
4
5
1
OF
1
FILE
SIZE B
REV D
DATE 7 FEB 2006
???
6
A
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