Texas Instruments ADS8350EVM-PDK User manual

User's Guide
SBAU218A–April 2014–Revised October 2014
ADS8350EVM-PDK
ADS8350EVM-PDK
This user's guide describes the characteristics, operation and use of the ADS8350EVM performance
demonstration kit (PDK). This kit is an evaluation platform for the ADS8350, dual-channel, 16-bit,
simultaneous sampling, successive approximation register (SAR) analog-to-digital converter (ADC) that
supports pseudo-differential analog inputs. This EVM eases the evaluation of the ADS8350 device with
hardware and software for computer connectivity through a universal serial bus (USB). This user's guide
includes complete circuit descriptions, a schematic diagram, and a bill of materials.
Throughout this document, the terms demonstration kit, evaluation board, evaluation module are
synonymous with the ADS8350EVM-PDK.
The following related documents are available through the Texas Instruments web site at
http://www.ti.com.
Related Documentation
Device Literature Number
ADS8350 SBAS580
REF5025 SBOS410
OPA2350 SBOS099
OPA376 SBOS432
OPA2836 SLOS712
TPS3836E18 SLVS292
TPS7A4700 SBVS204
REG71055 SBAS221
Windows XP, Windows 7, Windows 8, Excel are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola Inc.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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Contents
1 Overview...................................................................................................................... 3
2 EVM Analog Interface....................................................................................................... 3
3 Digital Interface .............................................................................................................. 7
4 Power Supplies .............................................................................................................. 8
5 ADS8350EVM-PDK Initial Setup .......................................................................................... 9
6 ADS8350EVM-PDK Kit Operation ....................................................................................... 16
7 Bill of Materials, PCB Layout, and Schematics......................................................................... 25
List of Figures
1 ADS8350EVM Analog Interface Input Connections .................................................................... 4
2 Bipolar Input Signal Configuration......................................................................................... 5
3 Unipolar Input Signal Configuration ....................................................................................... 5
4 REFIN_A and REFIN_B Reference Connections ...................................................................... 6
5 ADS8350EVM Default Jumper Settings .................................................................................. 9
6 Bottom View of Simple Capture Card Board with microSD Memory Card Installed .............................. 11
7 Bottom View of ADS8350EVM Rev B with microSD Card Installed................................................. 11
8 Connecting ADS8350EVM Board to Simple Capture Card Controller Board ...................................... 12
9 LED Indicators on the Simple Capture Card Board.................................................................... 12
10 Welcome Screen and Destination Directory Screens ................................................................. 13
11 License Agreement and Start Installation Screens .................................................................... 13
12 Progress Bar and Installation Complete Screens...................................................................... 14
13 Windows 7 Driver Installation Warning.................................................................................. 14
14 Simple Capture Card Device Driver Installation........................................................................ 15
15 Simple Capture Card Device Driver Completion....................................................................... 15
16 GUI Display Prompt........................................................................................................ 16
17 Open the ADS8350EVM Settings Page................................................................................ 17
18 ADS8350EVM Settings Page............................................................................................ 17
19 Bipolar or Unipolar Signal Jumper Settings Description on the GUI ................................................ 18
20 Open the Data Monitor page on the GUI .............................................................................. 18
21 Data Monitor Page ......................................................................................................... 19
22 Saving Data to a Text File ................................................................................................ 20
23 FFT Performance Analysis Page......................................................................................... 21
24 Histogram Analysis Page.................................................................................................. 23
25 Open the GUI Settings page............................................................................................. 24
26 Set Capture Mode to SDCC Interface While Using the EVM Hardware ........................................... 24
27 ADS8350EVM PCB: Top Layer .......................................................................................... 27
28 ADS8350EVM PCB: Ground Layer...................................................................................... 27
29 ADS8350EVM PCB: Power Layer ....................................................................................... 28
30 ADS8350EVM PCB: Bottom Layer ...................................................................................... 28
List of Tables
1 JP1 and JP2: Analog Interface Connections............................................................................. 4
2 SMA Analog Interface Connections ....................................................................................... 4
3 Connector J6 Pinout......................................................................................................... 7
4 Power-Supply Jumpers ..................................................................................................... 8
5 Default Jumper Configuration.............................................................................................. 9
6 ADS8350EVM Bill of Materials .......................................................................................... 25
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1 Overview
The ADS8350EVM-PDK is a platform for evaluation of the ADS8350 analog-to-digital converter (ADC).
The evaluation kit combines the ADS8350EVM board with a simple capture card controller board. The
simple capture card controller board consists of a TI Sitara embedded microcontroller (AM3352) and a
field programmable gate array (FPGA). The simple capture card controller board provides an interface
from the EVM to the computer through a universal serial bus (USB) port. The included software
communicates with the simple capture card controller board platform, and the simple capture card board
provides the power and digital signals used to communicate with the ADS8350EVM board. These
demonstration kits include the ADS8350EVM board, the simple capture card controller board, a microSD
memory card, and an A-to-micro-B USB cable.
1.1 ADS8350EVM Features
• Contains support circuitry as a design example to match ADC performance
• 3.3-V slave serial peripheral interface (SPI™)
• Onboard 5-V analog supply
• Onboard REF5025 (2.5-V) reference
• Voltage reference buffering with OPA2350
• Onboard OPA2836 (205-MHz BW, 1-mA quiescent current) ADC operational amplifier input drivers
1.2 ADS8350EVM-PDK Features
• USB port for computer interfacing
• Easy-to-use evaluation software for Windows XP®, Windows 7®, Windows 8®operating systems
• Data collection to text files
• Built-in analysis tools including scope, FFT, and histogram displays
• Complete control of board settings
2 EVM Analog Interface
The ADS8350 is a dual-channel, simultaneous-sampling ADC that supports pseudo-differential analog
inputs. Each channel of the ADS8350 uses a OPA2836 dual operational amplifier to drive the inputs of the
ADC; see Figure 1. The positive input terminals of each ADC are driven by the OPA836 operational
amplifier configured in the inverting configuration. The negative input terminals of each ADC are driven by
the OPA836 in the buffer configuration and biased at the 2.5-V, onboard reference voltage (+Vref). The
ADS8350EVM is designed for easy interfacing to multiple analog sources. SMA connectors allow the EVM
to have input signals connected through coaxial cables. In addition, header connectors JP1 and JP2
provide a convenient way to connect input signals.
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ADS8350
AINM-A (Pin 16)
AINP-A (Pin 15)
AINM-B (Pin 5)
AINP-B (Pin 6)
OPA836
Inverting Configuration
SMA J1
Header JP1.2
AIN_A
OPA836 Buffer
Vref_A
SMA J2
Header JP2.2
AIN_B
JP7
+
AVDD
VCM
JP8
OPA836
Inverting Configuration
+
AVDD
VCM
OPA836 Buffer
Vref_B
EVM Analog Interface www.ti.com
Figure 1. ADS8350EVM Analog Interface Input Connections
Table 1 summarizes the JP1 and JP2 analog interface connectors.
Table 1. JP1 and JP2: Analog Interface Connections
Terminal Number Signal Description
Channel A inverted input. The signal is routed through an
JP1.2 AIN_A OPA836 in the inverting configuration.
Channel B inverted input. The signal is routed through an
JP2.2 AIN_B OPA836 in the inverting configuration.
Table 2 lists the SMA analog inputs.
Table 2. SMA Analog Interface Connections
Terminal Number Signal Description
Channel A inverted input. The signal is routed through an
J1 AIN_A OPA836 in the inverting configuration.
Channel B inverted input. The signal is routed through an
J2 AIN_B OPA836 in the inverting configuration.
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JP9 / JP10 (Open)
+2.5 V
AINP
AINN
8200 pF
10 
OPA836
1 k5 V
1 k
10 
+
Å
+2.5 V
0.2 V
4.8 V
2.5 V
AIN_x
0.2 V
4.8 V
2.5 V
Unipolar Input Signal
+2.5 V
AINP
AINN
8200 pF
10 
OPA836
1 k5 V
1 k
10 
+
Å
+1.25 V
0.2 V
4.8 V
2.5 V
JP9 / JP10 (CLOSED)
AIN_x
±2.3 V
+2.3 V
0 V
Bipolar Input Signal
www.ti.com EVM Analog Interface
2.1 Bipolar Input Signal Configuration
When jumpers JP9 and JP10 are closed, the inverting amplifier positive input is biased with +1.25 V. This
bias voltage is created by dividing the ADS8350EVM 2.5-V onboard reference by two. The bias voltage at
the input results in a 2.5-V offset at the amplifier output. In this configuration, apply a bipolar input signal
with 0-V common-mode voltage.
To keep the OPA836 distortion as low as possible, the input signal swing is limited from –2.3 V to +2.3 V,
as shown in Figure 2.
Figure 2. Bipolar Input Signal Configuration
2.2 Unipolar Input Signal Configuration
When jumpers JP9 and JP10 are open, the inverting amplifier positive input is biased with +2.5 V. This
bias voltage is created using the ADS8350EVM 2.5-V onboard reference. In this configuration, apply a
unipolar input signal with 2.5-V common-mode voltage. To keep the OPA836 distortion as low as possible,
the input signal swing is limited from +0.2 V to +4.8 V, as shown in Figure 3.
Figure 3. Unipolar Input Signal Configuration
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5 V
1 k
1 µF
OPA2350
A/B
JP5 / JP6
2.5 V from
REF5025
REFIN-A / REFIN-B
0.22 
10 µF
0.22 
10 µF
+
EVM Analog Interface www.ti.com
2.3 ADS8350EVM Onboard Reference
The ADS8350 dual, simultaneous ADC operates with reference voltages Vref_A and Vref_B present on pins
REFIN_A and REFIN_B, respectively. The ADS8350EVM provides an onboard 2.5-V reference source,
REF5025 (U5), buffered with a dual OPA2350 amplifier and routed through jumpers JP5 and JP6. By
default, the EVM is set up with jumpers JP5 and JP6 installed, as shown in Figure 4.
Figure 4. REFIN_A and REFIN_B Reference Connections
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3 Digital Interface
Socket strip connector J6 provides the digital I/O connections between the ADS8350EVM board and the
simple capture card board.
Table 3 summarizes the pinout for connector J6.
Table 3. Connector J6 Pinout
Terminal Number Signal Description
J6.2, J6.10, J6.15, J6.16, GND Ground connections
J6.18
J6.4 EVM PRESENT EVM present, active low
I2C bus; used only used to program the U7
J6.11, J6.12 I2C™ bus EEPROM on the EVM board
3.3-V digital supply from simple capture card
J6.13 DVDD controller board
J6.34 CS Chip select, active low
J6.36 SCLK Serial interface clock
J6.40 SDO_A Serial data output for channel A
J6.42 SDO_B Serial data output for channel B
3.1 Serial Peripheral Interface (SPI)
The ADS8350 digital output is available in SPI-compatible format, which makes interfacing with
microprocessors, digital signal processors (DSPs), and FPGAs easy. The ADS8350EVM offers 47-Ω
resistors between the SPI signals and connector J6 to aid with signal integrity. Typically, in high-speed
SPI communication, fast signal edges can cause overshoot; these 47-Ωresistors slow down the signal
edges in order to minimize signal overshoot.
3.2 I2C Bus for Onboard EEPROM
The ADS8350EVM has an I2C bus to communicate with the onboard EEPROM that records the board
name and assembly date. It is not used in any form by the ADS8350 converter.
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4 Power Supplies
The analog portion of the ADS8350EVM-PDK requires a 5-V supply. The ADS8350EVM-PDK is
configured at the factory using the onboard regulated analog 5-V supply (+VA); and an onboard 3.3-V
digital supply. Alternatively, set the AVDD analog supply voltage by connecting an external power source
through two-terminal connector J5. Table 4 lists the configuration details for P3.
Table 4. Power-Supply Jumpers
Terminal Number Position Function
Shunt 2-3 (default) Onboard 5-V AVDD analog supply selected
JP12 External 5-V AVDD connected through two-terminal
Shunt 1-2 block J5
Open (default) Open sets onboard AVDD supply to 5 V
JP11 Closed Closed sets onboard AVDD supply to 5.2 V
CAUTION
The external AVDD supply applied to external two-terminal connector J5 must
not exceed 5.5 V or device damage may occur. The external AVDD supply
must be in the range of 5.0 V to 5.5 V for proper ADS8350EVM operation.
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5 ADS8350EVM-PDK Initial Setup
This section presents the steps required to set up the ADS8350EVM-PDK kit before operation.
5.1 Default Jumper Settings
A silkscreen plot detailing the default jumper settings is shown in Figure 5.Table 5 explains the
configuration for these jumpers.
Figure 5. ADS8350EVM Default Jumper Settings
Table 5. Default Jumper Configuration
Terminal Number Default Position Switch Description
JP1 Open JP1.2 header connector to inverted channel A input
JP2 Open JP1.2 header connector to inverted channel B input
JP3 N/A JP3 not installed on PCB board
JP4 N/A JP4 not installed on PCB board
JP5 Closed Closed to connect onboard 2.5-V reference to REFIN_A
JP6 Closed Closed to connect onboard 2.5-V reference to REFIN_B
JP7 Short 2-3 Short 2-3 connects AINM_A(-) to 2.5-V
JP8 Short 2-3 Short 2-3 connects AINM_B(-) to 2.5-V
Open for channel A unipolar input signals at SMA connector; closed for
JP9 Closed channel A bipolar input signals at SMA connector.
Open for channel B unipolar input signals at SMA connector; closed for
JP10 Closed channel B bipolar input signals at SMA connector.
JP11 Open Open sets onboard AVDD to 5 V; closed sets onboard AVDD to 5.2 V.
Short 2-3 selects onboard regulated AVDD supply; short 1-2 selects
JP12 Short 2-3 external AVDD through J5.
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5.2 Software Installation
This section presents the steps required to the install the software. Section 6 explains how to operate the
software to acquire data.
NOTE: The ADS8350EVM-PDK with ADS8350 PWB Board revision A includes (1) microSD card.
Ensure the microSD memory card included in the kit is installed in the microSD socket on the
back of the simple capture card board before connecting the EVM to the PC. Otherwise, as a
result of improper boot up, Windows cannot recognize the ADS8350EVM-PDK as a
connected device.
The ADS8350EVM-PDK with ADS8350 PWB Board revision B includes (2) microSD cards.
Ensure both microSD memory cards that contain the software are installed in the microSD
sockets on the back of the simple capture card board and on the back of ADS8350EVM
board respectively. Otherwise, as a result of improper boot up, Windows cannot recognize
the ADS8350EVM-PDK as a connected device.
Complete the following steps to install the software:
Step 1. Verify the microSD memory card(s) are installed:
• ADS8350EVM PWB revision A: This PDK kit version includes (1) microSD Card. Verify
the microSD memory card is installed on the simple capture card controller board
• ADS8350EVM PWB revision B: This PDK kit version includes (2) microSD Cards. Ensure
both microSD memory cards are installed in the microSD sockets on the back of the
simple capture card board and ADS8350EVM board respectively
Step 2. Verify jumpers are in the factory-default position and connect the hardware.
Step 3. Install the ADS8350EVM-PDK software.
Step 4. Complete the simple capture card device driver installation.
Each task is described in the following subsections.
5.2.1 Verify the microSD Memory Card is Installed on the Simple Capture Card Controller Board
The ADS8350EVM-PDK includes the microSD card(s) that contain the EVM software and simple capture
card controller board firmware required for the EVM operation.
NOTE: Ensure the microSD memory card that contains the software is installed in the microSD
socket (P6) on the back of the simple capture card board.
Figure 6 illustrates the bottom view of the simple capture card controller board with the
microSD card installed.
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Figure 6. Bottom View of Simple Capture Card Board with microSD Memory Card Installed
NOTE: ADS8350EVM-PDK with ADS8350EVM PWB Board revision B (only):
This ADS8350EVM PWB version includes two (2) microSD cards. Ensure both microSD
memory cards are installed in the microSD sockets on the back of the simple capture card
board and on the back of the ADS8350EVM, as shown in Figure 6 and Figure 7 respectively.
Figure 7. Bottom View of ADS8350EVM Rev B with microSD Card Installed
The microSD cards are formatted from the factory with the necessary firmware files for the simple capture
card controller board to boot properly. In addition to the simple capture card firmware files (app and MLO
files), the microSD cards contain the ADS8350EVM-PDK software installation files inside the ADS8350
EVM V#.#.# folder. <V#.#.#> refers to the installation software version number, and increments with
software installer releases.
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5.2.2 Verify Jumpers are in the Factory-Default Position and Connect the Hardware
The ADS8350EVM-PDK includes both the ADS8350EVM and the simple capture card controller board;
however, the devices are shipped unconnected. Follow these steps to verify that ADS8350EVM-PDK kit is
configured and connected properly.
Step 1. Verify the microSD card is installed on the back of the simple capture card board; see
Figure 6.
Step 2. Verify the ADS8350EVM jumpers are configured; see Figure 5.
Step 3. Connect the ADS8350EVM board to the simple capture card controller board as Figure 8
shows.
Figure 8. Connecting ADS8350EVM Board to Simple Capture Card Controller Board
Step 4. Connect the simple capture card controller board to the PC through the micro USB cable.
Step 5. Verify that the LED D5 Power Good indicator is illuminated. Wait approximately ten seconds
and verify that diode D2 blinks, indicating that USB communication with the host PC is
functioning properly. Figure 9 shows the location of the LED indicators in the simple capture
card controller board.
Figure 9. LED Indicators on the Simple Capture Card Board
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5.2.3 Install the ADS8350EVM-PDK Software
The ADS8350 EVM V#.#.# software must be installed on the PC. This software supports the
ADS8350EVM-PDK. The user must have administrator privileges to install the EVM software. The
following steps list the directions to install the software.
1. Open Windows explorer and find the microSD memory card in the browser as a storage device.
2. Navigate to the ...\ADS8350 EVM Vx.x.x\Volume\ folder.
3. Run the installer by right-clicking the setup.exe and selecting Run as Administrator. This action installs
the EVM GUI software and the required simple capture card device driver components.
4. After the installer begins, a welcome screen displays. Click Next to continue.
5. A prompt appears with the destination directory; select the default directory under: ...\Program
Files(x86)\Texas Instruments\ADS8350evm\, as shown in Figure 10.
Figure 10. Welcome Screen and Destination Directory Screens
6. One or more software license agreements appear. Select I Accept the License Agreement and click
Next.
7. The Start Installation screen appears, as shown in Figure 11. Click Next.
Figure 11. License Agreement and Start Installation Screens
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8. A progress bar appears; this step takes a few minutes.
9. The progress bar is followed by an installation complete notice, as shown in Figure 12.
Figure 12. Progress Bar and Installation Complete Screens
5.2.4 Complete the Simple Capture Card Device Driver Installation
During installation of the simple capture card device driver, a prompt may appear with the Windows
security message shown in Figure 13. Select Install this driver software anyway to install the driver
required for proper operation of the software. The drivers contained within the installers are safe for
installation to your system.
Figure 13. Windows 7 Driver Installation Warning
NOTE: Driver installation prompts do not appear if the simple capture card device driver is installed
on your system previously.
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The following steps describe how to install the simple capture card device driver.
Step 1. Immediately after the ADS8350 EVM software installation is complete, prompts appear to
install the simple capture card device driver, as shown in Figure 14 and Figure 15
Step 2. A computer restart may be required to finish the software installation. If prompted, restart the
PC to complete the installation.
Figure 14. Simple Capture Card Device Driver Installation
Figure 15. Simple Capture Card Device Driver Completion
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6 ADS8350EVM-PDK Kit Operation
This section describes how to use ADS8350EVM-PDK and the ADS8350EVM software to configure the
EVM and acquire data.
6.1 About the Simple Capture Card Controller Board
The simple capture card controller board provides the USB interface between the PC and the
ADS8350EVM. The controller board is designed around the AM335x processor, a USB 2.0 high-speed
capability, 32-bit ARM core. The simple capture card controller board incorporates an onboard FPGA
subsystem and 256MB of onboard DDR SRAM memory.
The simple capture card controller board is not sold as a development board, and it is not available
separately. TI cannot offer support for the simple capture card controller` board except as part of this EVM
kit.
6.2 Loading the ADS8350EVM-PDK Software
The ADS8350 EVM software provides control over the settings of the ADS8350. Adjust the ADS8350EVM
settings when the EVM is not acquiring data. During acquisition, all controls are disabled and settings
cannot be changed.
Settings on the ADS8350EVM correspond to settings described in the ADS8350 product data sheet
(available for download at http://www.ti.com); see the product data sheet for details.
To load the ADS8350 EVM software, follow these steps:
Step 1. Make sure the EVM kit is configured and powered up as explained in Section 5.
Step 2. Start the ADS8350 EVM software. Go to Start →All Programs →Texas Instruments →
ADS8350 EVM and run the software by right-clicking ADS8350 EVM and selecting Run as
Administrator.
Step 3. Verify that the software detects the ADS8350EVM. The GUI identifies the EVM hardware that
is connected to the controller board and displays Loading the ADS8350evm Settings. After
the settings are loaded, ADS8350EVM GUI displays at the top of the GUI screen, as shown
in Figure 16.
Figure 16. GUI Display Prompt
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6.3 ADS8350EVM Settings
Configure the ADS8350EVM for evaluation. The ADS8350EVM Settings page explains in detail the analog
input connections available on the evaluation board. In order to configure the EVM analog input
connections, follow these steps:
1. Load the ADS8350EVM Settings page in the GUI. Hover the cursor over the red arrow at the left-
center side of the GUI screen; a menu with different GUI pages appears. Click on ADS8350 EVM
Settings, as shown in Figure 17.
Figure 17. Open the ADS8350EVM Settings Page
2. The ADS8350 dual, simultaneous ADC requires reference voltages Vref_A and Vref_B present on pins
REFIN-A and REFIN_B, respectively. The ADS8350EVM provides an onboard 2.5-V reference source,
REF5025 (U5), buffered with a dual OPA2350 amplifier and routed through jumpers JP5 and JP6.
Therefore, jumpers JP5 and JP6 must be installed. Figure 18 shows the reference connections as
described on the ADS8350EVM Settings page of the GUI.
Figure 18. ADS8350EVM Settings Page
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3. Scroll down in the ADS8350EVM Settings page and find the ADS8350 Analog Inputs connections
descriptions on the GUI. The ADS8350EVM can be driven with a signal generator producing a bipolar
source signal centered on GND or a unipolar signal centered at +Vref / 2. Jumpers JP9 and JP10 are
installed when supporting a bipolar signal centered at GND. Jumpers JP9 and JP10 must be removed
when supporting a unipolar signal source signal centered at 2.5-V. Figure 19 shows jumpers JP9 and
JP10 on the ADS8350EVM Settings page of the GUI.
Figure 19. Bipolar or Unipolar Signal Jumper Settings Description on the GUI
6.4 Capturing Data with the ADS8350EVM-PDK
Access the Data Monitor page in the GUI to monitor data acquired by the ADS8350. This GUI page
displays the acquired data versus time. To access the Data Monitor page, hover the cursor over the red
arrow at the left center side of the GUI screen; a menu with different GUI pages appear. Click on the Data
Monitor option in the menu, as shown in Figure 20.
Figure 20. Open the Data Monitor page on the GUI
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Figure 21 shows the Data Monitor page of the EVM GUI. Configure the device sampling rate and capture
settings by using the Capture Settings portion of the Data Monitor page. The change in configuration
settings are executed immediately after pressing the Configure Device button. The following list describes
the different options available on the Data Monitor page.
No. of Samples— This option is used to select the number of samples captured in a block.
The number of samples captured in a block are contiguous. The drop-down menu is used to select
a data block in the range of 1024 samples to 1,048,576 samples per channel. This control provides
a drop-down list for values restricted to 2n, where nis an integer.
SCLK— This control sets the clock frequency used by the SPI interface to capture data.
By configuring the SCLK frequency, the data rate of the ADS8350 is configured. The
ADS8351EVM-PDK software supports SCLK frequencies of 24 MHz, 20 MHz, and 16.2 MHz.
These SCLK frequencies correspond to data rates of 750 kSPS, 625 kSPS, and 506.2 kSPS
respectively.
Device Status— This panel shows the current clock frequency and data rate of the ADS8350.
Figure 21. Data Monitor Page
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6.4.1 Data Collection to Text Files
The Data Monitor page of the GUI allows data to be saved in a tab-delimited text file format that can be
imported into Excel®, or other spreadsheet software tools. The text file contains the raw ADC data of both
channel A and channel B in decimal data format. Information such as the device name, date and time, the
sampling frequency, and number of samples of the data record are also stored. In order to save any data
captured by the EVM, click on the Save Data button and specify the file path and file name of the data file,
as shown in Figure 22.
Figure 22. Saving Data to a Text File
20 ADS8350EVM-PDK SBAU218A–April 2014–Revised October 2014
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