User's Guide
SBAU194– August 2011
ADS794xEVM and ADS794xEVM-PDK
ADS794xEVM-PDK
This user's guide describes the characteristics, operation, and use of the ADS794xEVM by itself and as
part of the ADS794xEVM-PDK kit. These evaluation modules (EVMs) allow evaluation of all aspects of
either the ADS7946 or ADS7945 devices (ADS794x). Both devices are 14-bit, dual-channel,
ultralow-power, differential successive-approximation-register (SAR) analog-to-digital converters (ADCs)
with a maximum throughput rate of 2 MSPS. The ADS7945 offers fully-differential input voltages while the
pseudo-differential inputs of the ADS7946 offer single-ended input voltages with small common-mode
noise-cancelling capabilities. Complete circuit descriptions, schematic diagrams, and bill of materials are
included in this document.
The following related documents are available through the Texas Instruments web site at
http://www.ti.com.
Related Documentation
Device Literature Number
ADS7945
ADS7946
OPA350 SBOS099C
OPA836 SLOS712B
REF5040 SBOS410E
SN74LVC2G74 SCES203M
ADCPro is a trademark of Texas Instruments.
Microsoft, Windows 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.
SBAS539
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Contents
1 EVM Overview ............................................................................................................... 3
2 Analog Interface ............................................................................................................. 4
3 Digital Interface .............................................................................................................. 7
4 Power Supplies .............................................................................................................. 8
5 EVM Operation .............................................................................................................. 9
6 ADS794xEVM-PDK: Software Installation ............................................................................. 10
7 ADS794xEVM-PDK Kit Operation ....................................................................................... 17
8 Bill of Materials, Schematics, and Layout .............................................................................. 20
List of Figures
1 ADS794xEVM and ADS7945 Analog Inputs ............................................................................ 5
2 ADS794xEVM and ADS7946 Analog Inputs ............................................................................ 6
3 ADS794xEVM Default Jumper Locations .............................................................................. 10
4 ADS794xEVM-PDK Plug-In Installer.................................................................................... 11
5 Completed ADS794xEVM-PDK Installer ............................................................................... 11
6 MMB0 Jumper Locations................................................................................................. 12
7 Connecting ADS794xEVM to MMB0.................................................................................... 13
8 Powering Up ADS794xEVM-PDK....................................................................................... 14
9 NI-VISA Driver Installation Prompt...................................................................................... 15
10 Loading ADS794xEVM Plug-in From ADCPro ........................................................................ 15
11 USBStyx Driver Installation Prompt..................................................................................... 16
12 ADS794xEVM Plug-in: Device Configuration Tab .................................................................... 18
13 ADCPro Test Plug-ins .................................................................................................... 19
14 ADS794xEVM PCB: Top Layer.......................................................................................... 22
15 ADS794xEVM PCB: Ground Layer ..................................................................................... 22
16 ADS794xEVM PCB: Power Layer....................................................................................... 23
17 ADS794xEVM PCB: Bottom Layer...................................................................................... 23
1 P2: Analog Interface Pinout (Samtec 10 x 2) ........................................................................... 4
2 SMA Analog Inputs ......................................................................................................... 4
3 P1: Serial Interface Header................................................................................................ 7
4 P3 Configuration: Power-Supply Interface Header..................................................................... 8
5 ADS794xEVM Bill of Materials .......................................................................................... 20
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List of Tables
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1 EVM Overview
1.1 Features
ADS794xEVM Features:
• Contains all support circuitry needed for the ADS7946/ADS7945 (ADS794x)
• 5-V, 3.3-V, and 1.8-V logic compatible with 16-bit, 40-MHz SPI™ serial interface
• Simple channel selection with a single 16-bit word command
• Serial interface header for easy connection to TI DSP-based communication systems
• Compatible with the TI Modular EVM System
• Voltage reference options: onboard REF5040 (4.096-V) reference or external reference
• Voltage reference buffering with OPA350
• Onboard OPA836 (200-MHz BW, 1-mA quiescent current) ADC input drivers
• Jumper-selectable bipolar (–V
ADS794xEVM-PDK Features:
• Easy-to-use evaluation software for Microsoft®Windows®XP operating system PCs
• 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
The ADS794xEVM-PDK is available for use with a computer. This kit combines the ADS794xEVM board
with the DSP-based MMB0 motherboard, and includes ADCPro™ software for evaluation.
The MMB0 motherboard allows the ADS794xEVM to be connected to the computer via an available USB
port. This manual shows how to use the MMB0 as part of the ADS794xEVM-PDK, but does not provide
technical details about the MMB0 itself.
ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based
on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.
The ADS794xEVM-PDK is controlled by a plug-in running 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 ADS794xEVM and the ADS794xEVM-PDK. Throughout this
document, the abbreviation EVM and the term evaluation module are synonymous with the ADS794xEVM.
Operation of the EVM and kit for both the ADS7946 and the ADS7945 devices is identical, unless
otherwise noted.
/2 to +V
REF
/2) or unipolar (0 V to V
REF
) input range
REF
EVM Overview
1.2 Introduction
The ADS794xEVM is an evaluation module built to the TI Modular EVM System specifications. It can be
connected to any modular EVM system interface card.
The ADS794xEVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS794xEVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the
ADS794xEVM is useful for prototyping designs and firmware because it offers circuitry that meets the
product data sheet specifications of either the ADS7946 or ADS7945 devices.
The ADS7945 and ADS7946 are 14-bit, 2-MSPS ADCs with fully differential and pseudo-differential
unipolar inputs, respectively. These devices operate at a 2-MSPS sample rate with a 16-clock SPI data
frame that features both outstanding dc and excellent dynamic performance. These devices also include a
two-channel input multiplexer and a low-power SAR ADC with an inherent sample-and-hold (S/H) input
stage. During normal operation at 2 MSPS, the ADS794x dissipates a mere 11.6 mW.
Note that the ADS794xEVM has no microprocessor and cannot run software. Therefore, some type of
interface is required to connect the ADS794xEVM to a computer. In the ADS794xEVM-PDK kit, the MMB0
motherboard serves as the interface between the computer and the ADS794xEVM board.
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Analog Interface
2 Analog Interface
The ADS794xEVM is designed for easy interfacing to multiple analog sources. SMA connectors allow the
EVM to have input signals connected via coaxial cables. In addition, the Samtec connector provides a
convenient 10-pin, dual-row, header/socket combination at P2. This header/socket provides access to the
analog input pins of the ADS794x. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for
a variety of mating connector options. All analog inputs are buffered by OPA836 high-speed operational
amplifiers in order to properly drive the ADS794x ADC inputs.
Use appropriate caution when handling these pins. Table 1 summarizes the pinout for analog interface P2.
Pin Number Signal Description
P2.2 A0(+) / OPEN
P2.4 A0(–)
P2.10 A1(+) / OPEN
P2.12 A1(–)
P2.1-19 (odd) GND Analog ground connections (except J1.15)
P2.6 and P2.8 GND Analog ground connections
P2.14, P2.16, and P2.18 GND Analog ground connections
P2.15 V
P2.20 Ext V
Table 1. P2: Analog Interface Pinout (Samtec 10 x 2)
CH0 positive differential input for ADS7945; open if
ADS7946 is installed
CH0 negative differential input for ADS7945;
single-ended input for ADS7946
CH1 positive differential input for ADS7945; open if
ADS7946 is installed
CH1 negative differential input for ADS7945;
single-ended input for ADS7946
REF
/4 or V
REF
REF
Unbuffered output. V
/2
closed)
External reference voltage input
/4 (J6 open) or V
REF
REF
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/2 (J6
Table 2 lists the SMA analog inputs.
Table 2. SMA Analog Inputs
Pin Number Signal Description
J10 A0(+) / No SMA
J11 A0(–)
J4 A1(+) / No SMA
J5 A1(–)
CH0 positive differential input for ADS7945; no
SMA if ADS7946 is installed
CH0 negative differential input for ADS7945;
single-ended input for ADS7946
CH1 positive differential input for ADS7945; no
SMA if ADS7946 is installed
CH1 negative differential input for ADS7945;
single-ended input for ADS7946
As noted in Table 1 and Table 2, there are different hardware configurations depending on the installed
converter. The ADS7945 uses two inputs per channel because of its fully differential inputs. The ADS7946
uses one input per channel for its pseudo-differential inputs.
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10
12
SMA
J10
SMA
J11
SMA
J4
SMA
J5
A0(+)
A1(+)
A0( )-
A1( )-
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
P2
AIN1P (pin 8)
AIN1N (pin 7)
AIN0P (pin 5)
AIN0N (pin 6)
ADS7945
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2.1 ADS794xEVM Analog Inputs with ADS7945 Installed
Each channel of the ADS7945 uses two OPA836 operational amplifiers to drive the fully differential inputs.
The input signals can be applied to either the SMA or P2 header connectors. These operational amplifiers
offset the input signal to use an inverting configuration with a single supply. The EVM Operation section
explains in detail how this offset is used to allow bipolar signals for the ADS7945 with jumper J6.
Figure 1 illustrates the ADS794xEVM analog inputs with the ADS7945 installed.
Analog Interface
Figure 1. ADS794xEVM and ADS7945 Analog Inputs
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5
4
10
12
No SMA
J10
SMA
J11
No SMA
J4
SMA
J5
A0(+)
A1(+)
A0( )-
A1( )-
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
P2
AIN1P (pin 8)
AIN1N (pin 7)
AIN0P (pin 5)
AIN0N (pin 6)
ADS7946
Open
Open
Analog Interface
2.2 ADS794xEVM Analog Inputs with ADS7946 Installed
Each channel of the ADS7946 uses one OPA836 to drive a single-ended input voltage. The input signals
can be applied to either the SMA or P2 header connectors. These operational amplifiers offset the input
signal to use an inverting configuration with a single supply. The EVM Operation section explains in detail
how this offset is used to allow bipolar signals for the ADS7946 with jumper J6.
Figure 2 shows the ADS794xEVM analog inputs with the ADS7946 installed.
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Figure 2. ADS794xEVM and ADS7946 Analog Inputs
2.3 External Reference Input
Pin P2.20 is an analog input for an external reference voltage when J2 is in position 2-3. The source that
provides this external reference should have a voltage between 2.5 V and the analog power-supply
voltage.
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3 Digital Interface
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-L-DV-P provide a convenient 10-pin,
dual-row, header/socket combination at P1. This header/socket provides access to the digital control pins
of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options.
Table 3 summarizes the pinouts for digital interface P1.
Pin Number Signal Description
P1.1 CS Chip select input. Pulled high with 10-kΩ resistor.
P1.3 SCLK Serial clock input
P1.7 CS
P1.11 SDI or MOSI SDI or MOSI input
P1.13 SDO or MISO SDO or MISO output
P1.19 PDEN
P1.4, P1.10, and P1.18 GND Digital ground connections
P1.16, P1.20 I2C™ bus
P1.2, P1.5-6, P1.8-9,
P1.12, P1.14-15, and Unused Unused
P1.17
Digital Interface
Table 3. P1: Serial Interface Header
Chip select input. This pin is intended to be used by
the MMB0 motherboard
Power-down input (active high). Pulled down with
10-kΩ resistor.
I2C bus; used only used to program the U4
EEPROM on the EVM board
3.1 Serial Interface (SPI)
The ADS794x ADC uses SPI serial communication in mode 0 (CPOL = 0, CPHA = 0). Because the serial
clock (SCLK) frequency can be as fast as 40 MHz, the ADS794xEVM offers 47-Ω resistors between the
SPI signals and P1 to aid with signal integrity. Typically, in high-speed SPI communication, fast signal
edges can cause overshoot; these 47-Ω resistors slow down the signal edges in order to minimize signal
overshoot.
3.2 ADS794x Channel Select as SDI (MISO)
The ADS794x ADC offers direct control over the internal multiplexer using pin 11. The ADS794xEVM uses
a flip-flop (see U9 in the attached schematic) to convert this pin into a typical SPI SDI (MOSI) pin. This
architecture takes advantage of the SPI full-duplex data transmission sequence to control channel
selection at the same time conversion data are acquired. The digital word 0x000 can be used to select
channel 0, and the word 0xFFFF can be used to select channel 1.
3.3 I2C Bus for Onboard EEPROM
The ADS794xEVM 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 ADS794x converter.
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Power Supplies
4 Power Supplies
P3 is the power-supply input connector. Table 4 lists the configuration details for P3.
Table 4. P3 Configuration: Power-Supply Interface Header
Pin Number Pin Name Function Required
P3.3 +5VA 5-V analog supply Yes
P3.5 GND Digital ground input Yes
P3.6 GND Analog ground input Yes
P3.7 +1.8VD 1.8-V digital supply Yes/Optional
P3.9 +3.3VD 3.3-V digital supply Yes/Optional
P3.10 +5VD 5-V digital supply Yes/Optional
P3.1-2, P3.4, and
P3.7-8
4.1 Analog Power Options
The ADS794xEVM board is designed to work with a 5-V analog power supply connected to P3.3.
4.2 Digital Power Options
The ADS794xEVM uses a jumper in J3 to connect the digital power supply to either +3.3 VD (P3.10) or +5
VD (P3.9). J3 in position 1-2 connects the digital power supply to +5 VD; position 2-3 connects the digital
power supply to +3.3 VD. Without a jumper in J3, the digital power supply can be connected to +1.8
VD(P3.7) with a jumper wire to pin J3.2. The jumper in J3 must always be in position 2-3 (+3.3 VD) while
using the MMB0 with the EVM.
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Unused Unused No
4.3 Reference Voltages
The ADS794xEVM uses a jumper in J2 to select between the internal (REF5040) and external voltage
reference sources. J2 in position 1-2 selects the internal reference; position 2-3 selects the external
reference. The selected reference is cleaned with a RC filter and buffered with a OPA350 operational
amplifier.
Digital supply and reference voltage must be at or below the analog supply
voltage at all times.
CAUTION
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5 EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the ADS794xEVM without the MMB0 motherboard. Software operation is presented in Section 7.
5.1 Analog Input
The ADS794xEVM offers three different analog input modes, selectable with jumper J6 and the type of
input signal. Note that the ADS794x converter by itself only allows dc-coupled unipolar signals. The two
additional input modes are available because OPA836 operational amplifiers drive the analog inputs. It is
preferable for external signal drivers or filters to have low output impedance to reduce gain errors.
Mode 1: DC-Coupled Unipolar Inputs (J6 Closed)
DC-coupled unipolar signals are typically produced by single-supply signal drivers. To allow dc-coupled
unipolar signals, J6 should be closed. This mode allows an input signal range from 0 V to V
analog inputs. In this mode, the voltage read at the ADC is equal to (V
Mode 2: DC-Coupled Bipolar Inputs (J6 Open)
DC-coupled bipolar signals are typically produced by dual-supply signal drivers. To allow dc-coupled
bipolar signals, J6 should be open. This mode allows an input signal range from –V
EVM analog inputs. In this mode, the voltage read at the ADC is equal to (V
Mode 3: AC-Coupled Inputs (J6 Closed)
AC-coupled signals are typically produced by high-pass filters. To allow ac-coupled bipolar signals, J6
should be closed. This mode allows an input signal range from –V
inputs. In this mode, the voltage read at the ADC is equal to (V
REF
/2 – VIN).
REF
– VIN).
REF
/2 to +V
REF
/2 to +V
REF
/2 – VIN).
REF
/2 for all EVM analog
REF
EVM Operation
for all EVM
/2 for all
REF
5.2 Digital Control
The digital control signals can be applied directly to the P1 header (top or bottom side). The modular
ADS794xEVM 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 MMB0 if purchased
as part of the ADS794xEVM-PDK. For a list of compatible interface and/or accessory boards for the EVM
or the ADS794x, see the relevant product folder on the TI web site.
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5.3 Default Jumper Settings
Figure 3 shows the jumper locations on the EVM board and the respective factory default conditions for
each.
Figure 3. ADS794xEVM Default Jumper Locations
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There are four jumpers on the ADS794xEVM board. These jumpers are used to set the CS signal entry
pin (J1), select the digital logic level (J3), select the reference (J2), and to establish the input signal range
type (J6). The default parameters are:
• The CS signal entry pin is P1.7 (J1: 2-3).
• The logic level is 3.3 V (J3: 2-3).
• The onboard 4.096 V is selected as the reference voltage (J1: 1-2).
• Analog input range is 0 V to V
(4.096 V) with dc-coupled signals (J6: closed)
REF
6 ADS794xEVM-PDK: Software Installation
This section presents the steps required to the install the software. Section 7 explains how to operate the
software to acquire data.
Complete the following steps to install the software:
Step 1. Install the ADCPro software (if not already installed) on a PC.
Step 2. Install the ADS794xEVM-PDK EVM plug-in software.
Step 3. Set up the ADS794xEVM-PDK hardware.
Step 4. Power up the ADS794xEVM-PDK.
Step 5. Connect the ADS794xEVM-PDK to the computer with a USB cable.
Step 6. Complete the USB driver installation process.
Each task is described in the subsequent sections of this document.
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6.1 Installing the ADCPro Software
CAUTION
Do not connect the ADS794xEVM-PDK to a PC before completing Section 6.2
through Section 6.4. Failure to observe this caution may cause Microsoft
Windows to not recognize the ADS794xEVM-PDK as a connected device.
ADCPro is the primary program used to evaluate ADCs. The latest software version of ADCPro is
available from the TI website at www.ti.com. Refer to the ADCPro User Guide for instructions on installing
and using ADCPro.
6.2 Installing ADS794xEVM-PDK Plug-In Software
The ADS794xEVM-PDK plug-in uses ADCPro; you must install ADCPro before uploading the plug-in.
To install the ADS794xEVM-PDK plug-in, run the file: ads794X-adcproplugin-<version #>.exe (<version
#> refers to the installation file version number, and increments with software version releases).
Double-click the file to run it; then follow the instructions as shown. You can also use the ADCPro Update
Check feature to check for newer versions of the ADS794xEVM-PDK plug-in, once you have installed a
version of it.
Figure 4 and Figure 5 show the initial and completed installer screenshots, respectively.
ADS794xEVM-PDK: Software Installation
Figure 4. ADS794xEVM-PDK Plug-In Installer
Figure 5. Completed ADS794xEVM-PDK Installer
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6.3 Configuring the ADS794xEVM-PDK Hardware
The ADS794xEVM-PDK contains both the ADS794xEVM and the MMB0 motherboard; however, the
devices may be shipped unconnected or configured incorrectly. Follow these steps to verify that
ADS794xEVM-PDK kit is properly configured and connected.
Step 1. Unpack the ADS794xEVM-PDK kit.
Step 2. Set the three jumpers on the MMB0 REV D as shown in Figure 6. Below Figure 6, there is a
check list that explains the functionality of each jumper.
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Figure 6. MMB0 Jumper Locations
Follow this check list to ensure proper operation of the MMB0 with the ADS794xEVM:
• J12 must be closed. This setting allows the wall supply to power up the MMB0 and the
ADS794xEVM through J2 (6-VDC input), and regulate down to +5 V, 3.3 V, and 1.8 V.
• J13B must be closed. This configuration connects the 5-V analog power supply with the 5-V digital
power supply.
• J13A must be opened. This setting allows the 5-V analog power supply to be regulated onboard.
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Step 3. Plug the ADS794xEVM into the MMB0, as Figure 7 illustrates.
Figure 7. Connecting ADS794xEVM to MMB0
CAUTION
Do not misalign the pins when plugging the ADS794xEVM into the MMB0.
Check the pin alignment carefully before applying power to the PDK.
Step 4. Set jumper J3 on the ADS794xEVM to position 2-3 in order to set the ADS794xEVM logic
voltage to 3.3 V. The MMB0 uses 3.3-V logic to communicate with the ADS7945xEVM.
Step 5. Set jumper J1 on the ADS794xEVM to position 2-3 in order to place the CS signal in P1.7 of
the EVM. The MMB0 sends the CS signal via P1.7.
Step 6. Set jumper J2 on the ADS794xEVM to position 1-2 if the 4.096-V internal (onboard) reference
is used. If an external reference is used, set J2 to the 2-3 position.
CAUTION
If an external reference is used, please do not apply external reference voltage
before the power is applied to the MMB0 motherboard.
Step 7. Set jumper J6 to match the correct type of input signal, as explained in Section 5.1:
• For dc-coupled unipolar input signals, J6 must be closed.
• For dc-oupled bipolar input signals, J6 must be opened.
• For ac-coupled signals, J6 must be closed.
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ADS794xEVM-PDK: Software Installation
6.4 Powering Up the ADS794xEVM-PDK
Once the ADS794xEVM-PDK kit is configured, power can be applied to the MMB0. This power comes
from a wall supply that delivers +6 VDC to the MMB0 via J2 on the MMB0 motherboard. This wall power
supply is included with the PDK; it should be connected where Figure 8 indicates.
Figure 8. Powering Up ADS794xEVM-PDK
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After the power supply is connected, four green LEDs in the bottom right-hand corner of the MMB0
motherboard should light up. If these LEDs do not light up, disconnect the power and verify that J12 is
closed.
6.5 First-Time Connection: ADS794xEVM-PDK to PC, Completing Driver Installation
The first time that the ADS794xEVM-PDK kit is connected to the PC via USB, the PC prompts the user for
two drivers. At this point, it is presumed that the ADCPro software and the ADS794xEVM plug-in have
been installed, and that the ADS794xEVM-PDK kit is properly configured and powered up (refer to
Section 6.1 through Section 6.4). The following sections show how to install these drivers.
NOTE: Driver prompts may not appear if another PDK kit has been used on the PC before.
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6.5.1 NI-VISA USB Device Driver Installation
Follow these procedures to install the NI-VISA USB device driver, if prompted.
Step 1. With power applied to the PDK kit, connect the PDK kit to the PC via USB.
Step 2. The computer should recognize the new hardware and prompt the user for drivers, as shown
in Figure 9. This driver should be present in the PC hard drive with the ADCPro files. Direct
the PC to search the driver and install it by clicking Next --> at every prompt.
ADS794xEVM-PDK: Software Installation
Figure 9. NI-VISA Driver Installation Prompt
6.5.2 USBStyx Driver Installation
The USBStyx driver prompt only appears when the ADCPro software uses the ADS794xEVM plug-in to
communicate with the PDK hardware for the first time. Follow these procedures to install the USBStyx
driver.
Step 1. Make sure that the PDK kit is configured and powered up as explained in Section 6.3 and
Section 6.4. Then, press the Reset button on the MMB0 upper right-hand corner once.
Step 2. Start ADCPro from the Windows Start menu.
Step 3. Load the ADS794xEVM plug-in from the ADCPro EVM drop-down menu as Figure 10
illustrates.
Figure 10. Loading ADS794xEVM Plug-in From ADCPro
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ADS794xEVM-PDK: Software Installation
Step 4. Wait for the driver prompt window to appear. 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; eventually, the driver prompt window will appear, as Figure 11 shows.
Figure 11. USBStyx Driver Installation Prompt
NOTE: If the USBStyx driver was previously installed on the PC, the status area should show the
message Select Device without prompting for the driver. If this message appears, close
ADCpro and proceed to Section 7.
www.ti.com
Step 5. This driver should be present in the PC hard drive with the ADCPro files. Direct the PC to
search the driver and install it by clicking Next --> at every prompt. Be patient; it may take
some time for the PC to find the driver.
NOTE: During the driver installation, a small pop-up window may appear indicating that the firmware
load has timed out. Ignore this pop-up. Continue with the USBStyx driver installation. Once
driver installation has finished, click the Exit button in the small-pop up window.
Step 6. Close ADCPro after the USBStyx driver has been installed.
16
ADS794xEVM and ADS794xEVM-PDK SBAU194–August 2011
Copyright © 2011, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
7 ADS794xEVM-PDK Kit Operation
The evaluation software is based on ADCPro. This program 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.
The following sections describe how to use ADCPro and the ADS794xEVM plug-in to acquire data.
7.1 About the MMB0
The MMB0 provides the USB interface between the PC and the ADS794xEVM. The MMB0 is a modular
EVM system motherboard. It is designed around the TMS320VC5507, a DSP with an onboard USB
interface from Texas Instruments. The MMB0 also has 16 MB 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.
7.2 Loading the ADS794xEVM-PDK Plug-in
The ADS794xEVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS794x.
You can adjust the ADS794xEVM 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 ADS794xEVM plug-in, the setting immediately updates on the board.
Settings on the ADS794xEVM correspond to settings described in the ADS794x product data sheet
(available for download at http://www.ti.com); see the product data sheet for details.
To load the ADS794xEVM plug-in, follow these steps.
Step 1. Make sure the PDK kit is configured and powered up as explained in Section 6.3 and
Section 6.4. Then, press the Reset button on the MMB0 (in the top right-hand corner) once to
clear the board memory.
Step 2. Start ADCPro from the Windows Start menu.
Step 3. Load the ADS794xEVM plug-in from the ADCPro drop-down EVM menu; see Figure 10. Note
that only one EVM plug-in can be loaded at a time. If a different plug-in is selected, the
previous plug-in is unloaded.
Step 4. When the plug-in is loaded, the plug-in searches for the board. A series of messages in the
status area will indicate this action, eventually showing Select Device...
The plug-in is now loaded and ready to work with the ADS794xEVM.
ADS794xEVM-PDK Kit Operation
SBAU194– August 2011 ADS794xEVM and ADS794xEVM-PDK
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17
Copyright © 2011, Texas Instruments Incorporated
ADS794xEVM-PDK Kit Operation
7.3 Using the ADS794xEVM Plug-in
The ADS794xEVM plug-in allows the user to evaluate the ADS794x ADC. Figure 12 shows the device
configuration tab of the ADS794xEVM Plug-in. Use this tab of the ADCPro software to configure the
ADS794x.
www.ti.com
Figure 12. ADS794xEVM Plug-in: Device Configuration Tab
The device configuration tab contains the following controls.
(1) Device Selection: This control is a user input that must be set by the user, to identify whether the
ADS7945 or ADS7946 is installed on the board.
(2) Channel Select: This user input selects the channel to be sampled.
(3) Data Rate: This control shows the data rate or sampling frequency used by the ADC to acquire data.
(4) Power Down: This option controls the power-down mode of the ADC.
(5) Device Interface Information: This option shows the SPI parameters that are in use while sampling
data. These parameters should appear after a device is selected.
(6) About: This control shows the plug-in version, MMB0 firmware version, ADS794xEVM assembly date,
and ADS794xEVM board revision information. This information should appear after a device is selected.
(7) Collection Bar: This feature shows the percentage of data collected during an acquisition session.
18
ADS794xEVM and ADS794xEVM-PDK SBAU194–August 2011
Copyright © 2011, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
7.4 Loading the Test Plug-in
Once the ADS794xEVM plug-in is configured in ADCPro, one of the four test plug-ins must be loaded in
ADCPro using the drop-down Test menu, as shown in Figure 13. Note that only one Test plug-in can be
loaded at a time. If a different plug-in is selected, the previous plug-in is unloaded.
There are four different test options available for the ADS794xEVM:
• Data monitor: This test acquires data and exports it in table format as hexadecimal data.
• MultiFFT: This test allows the user to acquire data and create an FFT graph of power vs. frequency to
display data
• MultiHistogram: This option acquires data and creates a histogram of code values.
• MultiScope: This feature acquires data and displays it in a graph of voltage vs. time.
For further details regarding how to set up and use the various test plug-ins, refer to the ADCPro User
Guide.
ADS794xEVM-PDK Kit Operation
Figure 13. ADCPro Test Plug-ins
7.5 Acquiring Data
Once the ADS794xEVM is configured for the desired test scenario, press the Acquire button to start the
data collection process; the software collects the number of data points specified in the Test plug-in Block
Size control. While acquiring data, the ADS794xEVM plug-in disables all front panel controls, and the
collection process bar displays the completion progress.
7.6 Troubleshooting
If the ADS794xEVM plug-in cannot find the ADS794xEVM-PDK, press the RESET button on the MMB0
and try again.
If ADCPro stops responding while the ADS794xEVM-PDK is connected, shut down and restart the
ADCPro software. Also, try unplugging the USB cable from the PDK. Unload and reload the plug-in before
reapplying power to the PDK.
SBAU194– August 2011 ADS794xEVM and ADS794xEVM-PDK
Submit Documentation Feedback
19
Copyright © 2011, Texas Instruments Incorporated
Bill of Materials, Schematics, and Layout
8 Bill of Materials, Schematics, and Layout
Schematics for the ADS794xEVM are appended to this user's guide. The bill of materials is provided in
Table 5. Section 8.2 shows the PCB layouts for the ADS794xEVM.
8.1 Bill of Materials
NOTE: All components should be compliant with the European Union Restriction on Use of
Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or
RoHS. Verify that purchased components are RoHS-compliant. (For more information about
TI's position on RoHS compliance, see the http://www.ti.com.)
Table 5. ADS794xEVM Bill of Materials
Qty
Item No. ADS7945 ADS7946 Ref Des Description Vendor Part Number
1 1 1 N/A Printed Circuit Board 6527650
2 Murata GRM188R71C104KA01D
3 4 4 TDK C1608X7R1A105K
4 2 2 C3, C11 Taiyo Yuden JMK316B7226ML-T
5 3 3 C5, C6, C29 Taiyo Yuden JMK212B7106KG-T
6 1 1 C8 Murata GRM188R71A225KE15D
7 Murata GRM1885C1H102JA01D
8 TDK C1608C0G1H2R2B
9 2 2 P1A, P2A Samtec TSM-110-01-L-DV-P
10 2 2 P1B, P2B Samtec SSW-110-22-F-D-VS-K
11 1 1 P3A Samtec TSM-105-01-L-DV-P
12 1 1 P3B Samtec SSW-105-22-F-D-VS-K
13 3 3 J1, J2, J3 Samtec TSW-103-07-L-S
14 Connector, SMA Jack Straight PCB
15 1 1 J6 Header Strip, 2-pin .100" Gold (1x2) Samtec TSW-102-07-L-S
16 Panasonic ERJ-3EKF47R0V
17 1 1 R14 Panasonic ERA-6AEB302V
18 1 1 R30 Panasonic ERA-6AEB152V
19 1 1 R15 Panasonic ERA-6AEB102V
20 1 1 R11 Panasonic ERA-3AEB102V
21 2 2 R5, R6 Panasonic ERJ-3EKF1002V
4 4
2 0 C20, C23
6 6
2 0 C22, C25
2 2 C15, C19
2 0 C18, C21
2 2 J5, J11 Amphenol 132134
2 0 J4, J10 Emerson 142-0701-201
8 8 R8, R28, R31,
2 0 R34, R37
C1, C13, C17,
C24
C2, C4, C10, Capacitor, X7R Ceramic ±10%,
C14 10WV, 0603
C9, C12, C16,
C26, C27, C28
R1, R2, R3, R4,
R42
Capacitor, X7R Ceramic ±10%,
16WV, 0603
Capacitor, X7R Ceramic ±20%,
6.3WV, 1206
Capacitor, X7R Ceramic ±10%,
6.3WV, 0805
Capacitor, X7R Ceramic ±10%,
10WV, 0603
Capacitor, C0G Ceramic ±5%,
50WV, 0603
Capacitor, C0G Ceramic ±0.1p,
50WV, 0603
Header, 20-Pin SMT Plug, .100"
Gold (2x10)
Header, 20-pin SMT Socket, .100"
Gold (2x10)
Header, 10-Pin SMT Plug, .100"
Gold (2x5)
Header, 10-pin SMT Socket, .100"
Gold (2x5)
Header, Strip, 3-pin .100" Gold
(1x3)
Resistor, Thick Film Chip, 1%,
1/10W, 0603
Resistor, Metal Film Chip, 0.1%,
1/8W, 0805
Resistor, Metal Film Chip, 0.1%,
1/8W, 0805
Resistor, Metal Film Chip, 0.1%,
1/8W, 0805
Resistor, Metal Film Chip, 0.1%,
1/10W, 0603
Resistor, Thick Film Chip, 1%,
1/10W, 0603
Texas
Instruments
www.ti.com
20
ADS794xEVM and ADS794xEVM-PDK SBAU194–August 2011
Copyright © 2011, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
Bill of Materials, Schematics, and Layout
Table 5. ADS794xEVM Bill of Materials (continued)
Qty
Item No. ADS7945 ADS7946 Ref Des Description Vendor Part Number
22 4 4 Vishay/Dale CRCW06034R99FKEA
4 4
23 Panasonic ERA-3AEB103V
4 0
24 Vishay/Dale CRCW06031R00FKEA
25 Panasonic ERJ-3GEY0R00V
26 3 3 T1, T2, T4 Test point PC Mini .040" D Red Keystone 5000
27 3 3 T5, T6, T7 Test point PC Mini .040" D Black Keystone 5001
28 1 1 T8 Test point PC Mini .040" D Yellow Keystone 5004
29 U1
30 1 1 U2 REF5040IDGKT
31 1 1 U3 OPA350EA/250
32 1 1 U4 Microchip 24LC256-I/ST
33 1 1 U9 IC D-Type, F-F w/CLR Preset SM8 SN74LVC2G74DCTR
34 OPA836IDBVT
35 4 4 N/A 0.100 Shunt, Black 3M 969102-0000-DA
3 3 R32, R40, R46
2 0 R35, R38
2 2 R9, R12
0 2 R25, R29
1 0 ADS7945SRTE
0 1 ADS7946SRTE
2 2 U5, U8
2 0 U6, U7
R20, R21, R26, Resistor, Thick Film Chip, 1%,
R27 1/10W, 0603
R16, R17, R24,
R45
R18, R22, R23,
R39
Resistor, Metal Film Chip, 0.1%,
1/10W, 0603
Resistor, Thick Film Chip, 1%,
1/10W, 0603
Resistor, Thick Film Chip, 1/10W,
0603
IC ADC, 14-bit, 2.5 MSPS, Full-Diff, Texas
QFN-16 Instruments
IC ADC, 14-bit, 2.5 MSPS, Texas
Pseudo-Diff, QFN-16 Instruments
IC Prec Volt Ref, 4.096 V LN/LD Texas
8-MSOP Instruments
IC Op Amp, GP, R-R 38 MHz Texas
Single, 8-MSOP Instruments
IC EEPROM, 256kBit, 400 kHz,
8-TSSOP
IC Op Amp, R-R Out, 200 MHz, Texas
SOT-23 Instruments
Texas
Instruments
SBAU194– August 2011 ADS794xEVM and ADS794xEVM-PDK
Submit Documentation Feedback
21
Copyright © 2011, Texas Instruments Incorporated
Bill of Materials, Schematics, and Layout
8.2 Board Layouts
Figure 14 through Figure 17 show the PCB layouts for the ADS794xEVM.
NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out;
they are not intended to be used for manufacturing ADS794xEVM PCBs.
www.ti.com
Figure 14. ADS794xEVM PCB: Top Layer
Figure 15. ADS794xEVM PCB: Ground Layer
22
ADS794xEVM and ADS794xEVM-PDK SBAU194–August 2011
Copyright © 2011, Texas Instruments Incorporated
Submit Documentation Feedback
www.ti.com
Bill of Materials, Schematics, and Layout
Figure 16. ADS794xEVM PCB: Power Layer
Figure 17. ADS794xEVM PCB: Bottom Layer
SBAU194– August 2011 ADS794xEVM and ADS794xEVM-PDK
Submit Documentation Feedback
23
Copyright © 2011, Texas Instruments Incorporated
A
B
D
C
A
B
C
D
654321
DATE:LTR ECO NO: APPROVED:
REVISION RECORD
DATED:
DESIGNED BY:
SIZE:
C
ADS7945-6EVM
/CS
FSX
SCLK
MOSI
MISO
/CS
SCLK
CH_SEL
SDO
GPIO5
EXT_REF_IN
SCLK
REF+
Texas Instruments, Inc.
HIGH-PERFORMANCE ANALOG DIVISION
PRECISION ANALOG PRODUCTS
SEMICONDUCTOR GROUP
5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA
TITLE:
May-17-2011
REV:
A
DRAWN BY:
Rafael Ordonez
Rafael Ordonez
6527650
DOCUMENT CONTROL NO.
SHEET OF11
FILE: ADS7945-6EVM_A.sch
654321
REF IN/EXT
/CS or FSX
VD 5.0/3.3
Unipolar
AGND
AGND
AGND
+VD
+5VA
EXT_REF
UniPolar VCM_Ouput
CH_SEL
*
*
*
*
*
*
*
*
*
*
*
*
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
P2
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
P1
12
34
56
78
910
P3
1
GND2AVDD3REFP4REFN
5
AIN0P
6
AIN0N
7
AIN1N
8
AIN1P
9NC10
NC
11
CH_SEL
12
PDEN
13
CS
14
SCLK
15
SDO
16
DVDD
17
THERMAL_PAD
U1
ADS7945/6
2
VIN
3
TEMP
6
VOUT
4
GND
5
TRIM
U2
REF5040
REF5040IDGKT
234
6
7
U3
OPA350EA/250
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
U4
24LC256-I/ST
R1 47
R2
47
R3
47
R4
47
J1
R6
10k
C3
22u
C1 0.1u
C2
1u
R5
10k
R7
NI
R8
47
R9 0
J2
C4
1u
R11
1k
C6
10u
R12
0
C8 2.2u
C9
1000p
C10
1u
J3
C11
22u
C12
1000p
C13
0.1u
C14
1u
R14
3k
R15
1k
1
2
3
4
5
6
U5
OPA836IDBVT
R16
10k
R17 10k
C15 2.2p
C16
1000p
C17
0.1u
1
2
3
4
5
6
U6
OPA836IDBVT
R18
10k
C18
2.2p
C20 0.1u
R20
4.99
R21
4.99
1
2
3
4
5
6
U7
OPA836IDBVT
R22
10k
R23
10k
C21 2.2p
C22
1000p
C23 0.1u
R26
4.99
R27
4.99
C27
1000p
C28
1000p
R28 47
1
234
5
J10
1
234
5
J11
T1
T2
T3
T4
T5
T6
T7
C5
10u
R10
NI
R19
NI
1
2
3
4
5
6
U8
OPA836IDBVT
R24 10k
C19 2.2p
C24 0.1u
T8
R25
NI
R29
NI
R31 47
R32
1
R34
47
R35
1
R37 47
C25
1000p
R38
1
R39
10k
R40
1
R42
47
C26
1000p
R43
NI
R44
NI
R45 10k
R46
1
C29
10u
1
234
5
J4
1
234
5
J5
1
CLK
2
D3Q
4
GND
5
Q
6
CLR
7
PRE
8
VCC
U9
SN74LVC2G74DCTR
R30
1.5k
J6
+5VA
+VD
+3.3VD
+5VA
+3.3VD +5VD
+5VA
+VD
+5VD
+3.3VD
+5VA
+5VA
+5VA
+5VA
+5VA
+5VA
+VD
UN_POL_VCM
A0(+)
A0(-)
A0(+)
A0(-)
A1(+)
UN_POL_VCM
UN_POL_VCM
UN_POL_VCM
UN_POL_VCM
A1(-)
A0(+)
A0(-)
A1(-)
A1(+)
A1(+)
A1(-)
Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
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electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
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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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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of –5 V to +5 V and the output voltage range of 0 V to +5 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
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During normal operation, some circuit components may have case temperatures greater than +27°C. The EVM is designed to
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