EVAL-AD765xSDZ User Guide
UG-535
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the AD7656/AD7657/AD7658, 250 kSPS, 6-Channel,
Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADCs
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 24
FEATURES
Full featured evaluation board for the AD7656/AD7657/
AD7658
PC control in conjunction with the system demonstration
platform (EVAL-SDP-CB1Z)
PC software for control and data analysis (time and
frequency domain)
Standalone capability
EVALUATION KIT CONTENTS
EVAL-AD7656SDZ, EVAL-AD7657SDZ, or
EVAL-AD7658SDZ evaluation board
Evaluation software CD for the AD7656/AD7657/AD7658
9 V mains power supply adapter
ADDITIONAL EQUIPMENT NEEDED
EVAL-SDP-CB1Z system demonstration platform, includes a
USB cable
Precision analog signal source
SMB cables
PC running Windows XP SP2, Windows Vista, or Windows 7
with USB 2.0 port
ONLINE RESOURCES
Documents
AD7656/AD7657/AD7658 data sheet
EVAL-AD7656SDZ/EVAL-AD7657SDZ/EVAL-AD7658SDZ
user guide
Required Software
EVAL-AD7656SDZ/EVAL-AD7657SDZ/EVAL-AD7658SDZ
evaluation software
GENERAL DESCRIPTION
The E VA L -AD7656SDZ/EVA L -AD7657SDZ/E VA L -AD7658SDZ
are full featured evaluation boards that can be used to easily
evaluate all features of the AD7656/AD7657/AD7658. The
AD7656/AD7657/AD7658 are 16-/14-/12-bit, 6-channel, 250 kSPS
simultaneous sampling ADCs, respectively. Each part contains six
16-, 14-, or 12-bit, low power SAR ADCs and can operate from a
single 4.75 V to 5.25 V power supply or dual ±12 V power supplies.
The parts feature throughput rates of up to 250 kSPS.
The evaluation boards can be controlled via the system demon-
stration platform (SDP). The E VA L-SDP-CB1Z board allows
the evaluation boards to be controlled via the USB port of a PC
using the AD7656/AD7657/AD7658 evaluation software. The
E VA L-AD7656SDZ/EVA L -AD7657SDZ/E VA L -AD7658SDZ
generates all required power supplies on board and supplies power
to the E VA L -SDP-CB1Z controller board.
On-board components include the following:
AD8597: ultralow distortion, ultralow noise op amp (single)
AD8031: 2.7 V, 800 µA, 80 MHz rail-to-rail I/O single amplifier
ADP1613: step-up PWM dc-to-dc switching converter
ADP3303-5: high accuracy anyCAP® 200 mA low dropout
linear regulator
ADP2301: 1.2 A, 20 V, 1.4 MHz nonsynchronous step-down
switching regulator
ADM1185: quad voltage monitor and sequencer
ADP190: logic controlled, high-side power switch
ADG3308: low voltage, 1.15 V to 5.5 V, 8-channel bidirectional
logic level translator
ADR431: ultralow noise XFET® voltage reference with current
sink and source capability
AD780: 2.5 V/3.0 V ultrahigh precision band gap voltage reference
A functional block diagram is shown in Figure 1, and various link
options are described in the Link Configuration Options section.
For full details on the AD7656/AD7657/AD7658, see the AD7656/
AD7657/AD7658 data sheet, which should be consulted in con-
junction with this user guide when using these evaluation boards.
UG-535 EVAL-AD765xSDZ User Guide
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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents ................................................................... 1
Additional Equipment Needed ....................................................... 1
Online Resources .............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Functional Block Diagram .............................................................. 3
Getting Started .................................................................................. 4
Quick Start Steps .......................................................................... 4
Software Installation Procedures ................................................ 5
Evaluation Board Setup Procedures ........................................... 8
Evaluation Board Hardware ............................................................ 9
AD7656/AD7657/AD7658 Device Description ....................... 9
Power Supplies .............................................................................. 9
Link Configuration Options ......................................................... 10
Setup Conditions ........................................................................ 10
Evaluation Board Circuitry ........................................................... 14
Analog Inputs.............................................................................. 14
Reference Options ...................................................................... 14
Sockets/Connectors ................................................................... 14
Modes of Operation ....................................................................... 15
SDP Controlled Mode ............................................................... 15
Standalone Mode ........................................................................ 15
How to Use the Software for Evaluating the
AD7656/AD7657/AD7658 ............................................................ 16
Setting Up the System for Data Capture ................................. 16
Overview of the Main Window ................................................ 18
Generating a Waveform Analysis Report ................................ 20
Generating a Histogram of the ADC Code Distribution ..... 21
Generating a Fast Fourier Transform of AC Characteristics ...... 22
Generating a Summary of the Waveform, Histogram, and
Fast Fourier Transform .............................................................. 23
Related Links ................................................................................... 24
REVISION HISTORY
7/13—Revision 0: Initial Version
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 3 of 24
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
5V
V
SS
V
DD
DV
CC
AV
CC
V
DRIVE
V1
V2
V3
V4
V5
V6
3.3VIO
V1
V2
V3
V4
V5
V6
AD8597
AD8597
AD8597
AD8597
AD8597
AD8597
GND
GND
AGND AV
CC
DGND DV
CC
VIN GND
V
DRIVE
V
DD
V
SS
OP AMP
SUPPLIES
AD780/
ADR431
REF
AD7656
REFIN/
REFOUT REFCAPA T O
REFCAPC SER/PAR SEL
RANGE
W/B
RESET
DB0 TO DB15
BUSY
WR
RD
CS
CONVST A TO CONVST C
HARDWARE
SELECT
EVAL-SDP-CB1Z
CONTROLLER
BOARD
ADG3308
LEVEL
SHIFTERS
BF527
DSP
PARALLEL
INTERFACE
ON-BOARD
POWER SUPPLIES
ADM1185
POWER
SEQUENCER
ADP1613
±15V
ADP3303
(×2) + 5V
ADP2301
SDP 5V
ADP190
+3.3V
+
–
VIN
7V T O
9V
DC INP UT
JACK
11338-001
H/S SEL
EVAL-AD7656SDZ
UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 4 of 24
GETTING STARTED
QUICK START STEPS
To begin using the evaluation board, do the following:
1. With the E VA L -SDP-CB1Z board disconnected from the
USB port of the PC, install the AD7656/AD7657/AD7658
evaluation board software from the CD included in the
evaluation board kit. The PC must be restarted after the
software installation is complete. (For complete software
installation instructions, see the Software Installation
Procedures section.)
2. Connect the E VA L -SDP-CB1Z board to the E VA L -
AD7656SDZ/EVA L -AD7657SDZ/E VA L -AD7658SDZ
board as shown in Figure 2. Screw the two boards together
using the nylon screw-nut set included in the evaluation
board kit to ensure that the boards are connected firmly
together.
3. Connect the 9 V power supply adapter included in the evalu-
ation board kit to Connector J702 on the E VA L -AD7656SDZ/
E VA L-AD7657SDZ/E VA L -AD7658SDZ board.
4. Connect the E VA L -SDP-CB1Z board to the PC using the
supplied USB cable. (If you are using Windows® XP, you may
need to search for the E VA L -SDP-CB1Z drivers. Choose to
automatically search for the drivers for the E VA L -SDP-CB1Z
board if prompted by the operating system.)
5. Launch the E VA L -AD7656SDZ/E VA L-AD7657SDZ/
E VA L-AD7658SDZ software from the Analog Devices
subfolder in the Programs menu.
Figure 2. Hardware Configuration—Setting Up the EVAL-AD7656SDZ/EVAL-AD7657SDZ/EVAL-AD7658SDZ
(EVAL-AD7656SDZ/EVAL-AD7657SDZ/EVAL-AD7658SDZ on Left and EVAL-SDP-CB1Z on Right)
11338-002
9V PSU
USB TO PC
EVAL-SDP-CB1Z
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 5 of 24
SOFTWARE INSTALLATION PROCEDURES
The E VA L -AD7656SDZ/EVA L -AD7657SDZ/E VA L -AD7658SDZ
evaluation kit includes a CD containing software to be installed
on your PC before you begin using the evaluation board.
There are two parts to the installation:
• AD7656/AD7657/AD7658 evaluation board software
installation
• E VA L-SDP-CB1Z system demonstration platform board
drivers installation
Warning
The evaluation board software and drivers must be installed
before connecting the evaluation board and EVA L -SDP-CB1Z
board to the USB port of the PC to ensure that the evaluation
system is correctly recognized when it is connected to the PC.
Installing the AD7656/AD7657/AD7658 Evaluation
Board Software
To install the AD7656/AD7657/AD7658 evaluation board
software,
1. With the E VA L -SDP-CB1Z board disconnected from the
USB port of the PC, insert the installation CD into the CD-
ROM drive.
2. Double-click the setup.exe file to begin the evaluation
board software installation. The software is installed to the
following default location: C:\Program Files\Analog
Devices\AD7656_57_58.
3. A dialog box appears asking for permission to allow the
program to make changes to your computer. Click Ye s.
Figure 3. AD7656/AD7657/AD7658 Evaluation Board Software Installation:
Granting Permission for Program to Make Changes
4. Select the location to install the software, and then click Next.
Figure 4. AD7656/AD7657/AD7658 Evaluation Board Software Installation:
Selecting the Location for Software Installation
5. A license agreement appears. Read the agreement, and then
select I accept the License Agreement and click Next.
Figure 5. AD7656/AD7657/AD7658 Evaluation Board Software Installation:
Accepting the License Agreement
11338-003
11338-004
11338-005
UG-535 EVAL-AD765xSDZ User Guide
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6. A summary of the installation is displayed. Click Next to
continue.
Figure 6. AD7656/AD7657/AD7658 Evaluation Board Software Installation:
Reviewing a Summary of the Installation
7. A dialog box informs you when the installation is
complete. Click Next.
Figure 7. AD7656/AD7657/AD7658 Evaluation Board Software Installation:
Indicating When the Installation Is Complete
Installing the EVAL-SDP-CB1Z System Demonstration
Platform Board Drivers
After the installation of the evaluation board software is complete,
a welcome window is displayed for the installation of the E VA L -
SDP-CB1Z system demonstration platform board drivers.
1. With the E VA L -SDP-CB1Z board still disconnected from
the USB port of the PC, make sure that all other applications
are closed, and then click Next.
Figure 8. EVAL-SDP-CB1Z Drivers Setup:
Beginning the Drivers Installation
2. Select the location to install the drivers, and then click Next.
Figure 9. EVAL-SDP-CB1Z Drivers Setup:
Selecting the Location for Drivers Installation
11338-006
11338-007
11338-008
11338-009
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 7 of 24
3. Click Install to confirm that you would like to install the
drivers.
Figure 10. EVAL-SDP-CB1Z Drivers Setup:
Granting Permission to Install Drivers
4. To complete the drivers installation, click Finish, which
closes the installation wizard.
Figure 11. EVAL-SDP-CB1Z Drivers Setup:
Completing the Drivers Setup Wizard
5. Before using the evaluation board, you must restart your
computer. A dialog box opens, giving you the following
options: Restart, Shut Down, Restart Later. Click the
appropriate button.
Figure 12. EVAL-SDP-CB1Z Drivers Setup:
Restarting the Computer
11338-010
11338-011
11338-012
UG-535 EVAL-AD765xSDZ User Guide
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EVALUATION BOARD SETUP PROCEDURES
The AD7656/AD7657/AD7658 evaluation board connects to the
E VA L -SDP-CB1Z system demonstration board. The E VA L -SDP-
CB1Z board is the controller board, which is the communication
link between the PC and the main evaluation board. Figure 2 shows
a photograph of the connections made between the AD7656/
AD7657/AD7658 daughter board and the EVA L -SDP-CB1Z board.
After following the instructions in the Software Installation
Procedures section, set up the evaluation and SDP boards as
detailed in this section.
Warning
The evaluation software and drivers must be installed before con-
necting the evaluation board and E VA L -SDP-CB1Z board to
the USB port of the PC to ensure that the evaluation system is
correctly recognized when it is connected to the PC.
Configuring the Evaluation and SDP Boards
1. Connect the E VA L -AD7656SDZ/E VA L -AD7657SDZ/
E VA L-AD7658SDZ board to Connector A or Connector B of
the E VA L -SDP-CB1Z board (see Figure 2).
a. Screw the two boards together using the nylon screw-
nut set included in the evaluation board kit to ensure
that the boards are connected firmly together.
2. Connect the 9 V power supply adapter included in the evalu-
ation kit to Connector J702 of the E VA L-AD7656SDZ/
E VA L -AD7657SDZ/E VA L -AD7658SDZ board. (See Table 1
for more information about the connections and options
for the required power supplies.)
3. Connect the E VA L -SDP-CB1Z board to the PC using the
supplied USB cable.
EVAL-AD765xSDZ User Guide UG-535
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EVALUATION BOARD HARDWARE
AD7656/AD7657/AD7658 DEVICE DESCRIPTION
Each AD7656/AD7657/AD7658 device contains six 16-/14-/12-bit,
fast, low power successive approximation ADCs in a package
designed on the iCMOS® process (industrial CMOS). iCMOS is
a process combining high voltage silicon with submicron CMOS
and complementary bipolar technologies. It enables the develop-
ment of a wide range of high performance analog ICs capable
of 33 V operation in a footprint that no previous generation of
high voltage parts could achieve.
There are also reduced decoupling pin- and software-compatible
versions of these devices available: AD7656-1/AD7657-1/
AD7658-1. Both versions feature throughput rates of up to
250 kSPS. For more information about these devices, refer to
the AD7656/AD7657/AD7658 data sheet, which should be used
in conjunction with this user guide (or refer to the AD7656-1/
AD7657-1/AD7658-1 data sheet, which should be used in con-
junction with the E VA L -AD7656-1SDZ/E VA L -AD7657-1SDZ/
EVAL-AD7658-1SDZ user guide (UG-417)).
POWER SUPPLIES
The E VA L -AD7656SDZ/E VA L -AD7657SDZ/E VA L -AD7658SDZ
can be used in two modes: SDP controlled mode and standalone
mode (see the Modes of Operation section for more information).
When the E VA L -AD7656SDZ/EVA L -AD7657SDZ/EVA L -
AD7658SDZ board is used in conjunction with the E VA L -SDP-
CB1Z board (SDP controlled mode), connect the 9 V dc supply
to Connector J702 on the E VA L -AD7656SDZ/E VA L -AD7657SDZ/
E VA L -AD7658SDZ board. The VDD, VSS, AVCC, and DVCC supplies
are generated on board. When the EVA L -AD7656SDZ/E VA L -
AD7657SDZ/EVA L -AD7658SDZ board is used in standalone
mode, the VDD, VSS, AVCC, and DVCC supplies must be sourced
from external sources (see Table 1).
In SDP controlled mode and standalone mode, each supply is
decoupled on the E VA L -AD7656SDZ/E VA L -AD7657SDZ/
E VA L-AD7658SDZ using 10 µF and 0.1 µF capacitors. A single
ground plane is used on this board to minimize the effect of
high frequency noise interference.
Table 1. External Power Supplies Required
Power Supply Connector Voltage Range Purpose
VIN1 J702 7 V to 9 V Supplies all on-board power supplies, generating all required voltages to run the
evaluation board
VDD J100 +12 V to +16.5 V Supplies the positive rail of the amplifier
V
SS
J100
−12 V to −16.5 V
Supplies the negative rail of the amplifier
AVCC J703 4.75 V to 5.25 V Supplies the AVCC analog supply on the ADC
DVCC J701 4.75 V to 5.25 V Supplies the DVCC digital supply on the ADC
1 When VIN is supplied, all other power supplies are available on board. If the VIN supply is not used, all other power supplies must be sourced from an external source.
UG-535 EVAL-AD765xSDZ User Guide
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LINK CONFIGURATION OPTIONS
There are multiple jumper (LKx) and solder link (SLx) options
that must be set correctly to select the appropriate operating setup
before you begin using the evaluation board. The functions of
these options are outlined in Table 2.
SETUP CONDITIONS
Care should be taken before applying power and signals to the
evaluation board to ensure that all link positions are as required
by the operating mode. There are two modes in which to operate
the evaluation board. The evaluation board can be operated in
SDP controlled mode to be used with the SDP board, or the
evaluation board can be used in standalone mode.
Table 3 shows the default positions in which the links are set when
the evaluation board is packaged. When the board is shipped, it
is assumed that you are going to operate the evaluation board
with the SDP board (SDP controlled mode).
Table 2. Link Option Functions
Link No. Function
LK1 H/S SEL selection.
Position A: the software input is selected.
Position B: the hardware input is selected.
LK2 VREF buffer signal selection.
Position A: the VREF signal is unbuffered.
Position B: the VREF signal is buffered by the AD8031 op amp (U10).
LK3 WR/REFEN/DIS signal selection.
Position A: the WR/REFEN/DIS pin is connected to EVAL-SDP-CB1Z.
Position B: the WR/REFEN/DIS pin is connected to the J7-2 external socket.
Position C: the WR/REFEN/DIS pin is connected to GND.
Position D: the WR/REFEN/DIS pin is connected to VDRIVE.
LK4 V1 input jumper.
Inserted: the V1 input is shorted to GND.
LK5 V2 input jumper.
Inserted: the V2 input is shorted to GND.
LK6 RANGE signal selection.
Position A: the RANGE pin is connected to VDRIVE.
Position B: the RANGE pin is connected to GND. The input range is set to ±4 × VREF.
LK7 STBY signal selection.
Position A: the STBY pin is connected to VDRIVE. Normal operation is selected.
Position B: the STBY pin is connected to GND.
LK8 RESET signal selection.
Position A: the RESET pin is connected to VDRIVE.
Position B: the RESET pin is connected to GND.
Position C: the RESET pin is connected to EVAL-SDP-CB1Z.
LK9 W/B signal selection.
Position A: the W/B pin is connected to VDRIVE.
Position B: the W/B pin is connected to GND. Word mode is selected.
LK10 BUSY signal selection.
Position A: the
BUSY
pin is connected to EVAL-SDP-CB1Z.
Position B: the BUSY pin is connected to the J7-12 external socket.
LK11 CONVST A signal selection.
Position A: the CONVST A pin is connected to the J7-8 external socket.
Position B: the CONVST A pin is connected to EVAL-SDP-CB1Z.
Position C: the
CONVST A
pin is connected to GND.
LK12 CS source signal selection.
Position A: the CS pin is connected to EVAL-SDP-CB1Z.
Position B: the CS pin is connected to the J7-1 external socket.
LK13 REFIN/REFOUT source signal selection.
Position A: the REFIN/REFOUT signal is sourced from AD780 (U5).
Position B: the REFIN/REFOUT signal is sourced from ADR431 (U3).
LK14 V3 input jumper.
Inserted: the V3 input is shorted to GND.
EVAL-AD765xSDZ User Guide UG-535
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Link No. Function
LK15 V4 input jumper.
Inserted: the V4 input is shorted to GND.
LK16 VDRIVE source signal selection.
Position A: the VDRIVE signal is sourced from the on-board 3.3 V supply. (Requires the EVAL-SDP-CB1Z board to be connected.)
Position B: the VDRIVE pin is connected to the J7-14 external socket.
LK17 V5 input jumper.
Inserted: the V5 input is shorted to GND.
LK18 V6 input jumper.
Inserted: the V6 input is shorted to GND.
LK19 REFIN/REFOUT input selection.
Inserted: the VREF signal is connected to the REFIN/REFOUT pin.
LK20 SER/PAR SEL selection.
Position A: the SER/PAR SEL pin is connected to VDRIVE.
Position B: the SER/PAR SEL pin is connected to GND. Parallel mode is selected.
LK21 AD780 (U5) voltage output selection.
Inserted: the AD780 voltage output is 3 V.
Removed: the AD780 voltage output is 2.5 V.
LK22 CONVST A/CONVST B link selection.
Inserted: connects CONVST A to CONVST B.
LK23 RD source signal selection.
Position A: the RD pin is connected to EVAL-SDP-CB1Z.
Position B: the RD pin is connected to the J7-3 external socket.
LK24 REFCAPA source signal selection.
Inserted: an external reference is connected to REFCAPA.
Removed: an external reference is disconnected from REFCAPA.
LK25 DB10/DOUT C destination selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: data is sent to the J7-4 external socket.
LK26 DB7/HBEN/DCEN selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: the DB7/HBEN/DCEN pin is connected to VDRIVE.
Position C: the DB7/HBEN/DCEN pin is connected to GND.
LK27 DB9/DOUT B destination selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: not used.
Position C: data is sent to the J7-5 external socket.
LK28 DB8/DOUT A destination selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: not used.
Position C: data is sent to the J7-6 external socket.
LK29 DB14/REFBUFEN/DIS selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: the DB14/REFBUFEN/DIS pin is connected to VDRIVE.
Position C: the DB14/REFBUFEN/DIS pin is connected to GND.
LK30 DB6/SCLK selection.
Position A: the DB6/SCLK pin is connected to EVAL-SDP-CB1Z.
Position B: not used.
Position C: the DB6/SCLK pin is connected to the J7-11 external socket.
LK31 DB2/SEL C selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: the DB2/SEL C pin is connected to VDRIVE.
Position C: the DB2/SEL C pin is connected to GND.
LK32 DB1/SEL B selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: the DB1/SEL B pin is connected to VDRIVE.
Position C: the DB1/SEL B pin is connected to GND.
UG-535 EVAL-AD765xSDZ User Guide
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Link No. Function
LK33 DB0/SEL A selection.
Position A: data is sent to EVAL-SDP-CB1Z.
Position B: the DB0/SEL A pin is connected to VDRIVE.
Position C: the DB0/SEL A pin is connected to GND.
LK34 CONVST B selection.
Position A: the CONVST B pin is connected to the J7-9 external socket.
Position B: the CONVST B pin is connected to EVAL-SDP-CB1Z.
Position C: the CONVST B pin is connected to GND.
LK35 CONVST C selection.
Position A: the CONVST C pin is connected to the J7-10 external socket.
Position B: the CONVST C pin is connected to EVAL-SDP-CB1Z.
Position C: the CONVST C pin is connected to GND.
LK36 CONVST A/CONVST C link selection.
Inserted: connects CONVST A to CONVST C.
LK101 VSS signal source selection (op amp negative supply).
Position A: the VSS signal is sourced from the on-board supply generation circuitry (−12 V).
Position B: the VSS signal is sourced from the J100 external socket.
LK102 VDD signal source selection (op amp positive supply).
Position A: the VDD signal is sourced from the on-board supply generation circuitry (+12 V).
Position B: the VDD signal is sourced from the J100 external socket.
LK103 to LK106 Sets the VDD and VSS levels when using the on-board supplies as follows (where POP = place both 0 Ω resistors, and NOPOP = neither
0 Ω resistor is placed).
Link
±12 V
±15 V
LK103 POP NOPOP
LK104 NOPOP POP
LK105 NOPOP POP
LK106 POP NOPOP
LK701 AVCC signal source selection.
Position A: the AVCC signal is sourced from the on-board supply generation circuitry.
Position B: the AVCC signal is sourced from the J703 external socket.
LK702 DVCC signal source selection.
Position A: the DVCC signal is sourced from the on-board supply generation circuitry.
Position B: the DVCC signal is sourced from the J701 external socket.
SL1 REFCAPA/REFCAPB link selection.
Inserted: connects REFCAPA to REFCAPB when soldered.
SL2 REFCAPB/REFCAPC link selection.
Inserted: connects REFCAPB to REFCAPC when soldered.
SL3 to SL14 Not used. Leave unsoldered.
SL15 V1 buffer selection.
Position A: the V1 input signal is buffered through U4.
Position B: the V1 input signal is taken directly from J1.
SL16 V2 buffer selection.
Position A: the V2 input signal is buffered through U7.
Position B: the V2 input signal is taken directly from J2.
SL17 V3 buffer selection.
Position A: the V3 input signal is buffered through U8.
Position B: the V3 input signal is taken directly from J7.
SL18 V4 buffer selection.
Position A: the V4 input signal is buffered through U9.
Position B: the V4 input signal is taken directly from J4.
SL19
V5 buffer selection.
Position A: the V5 input signal is buffered through U11.
Position B: the V5 input signal is taken directly from J5.
SL20 V6 buffer selection.
Position A: the V6 input signal is buffered through U12.
Position B: the V6 input signal is taken directly from J6.
EVAL-AD765xSDZ User Guide UG-535
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Table 3. Default Link Positions for Packaged EVAL-AD7656SDZ/EVAL-AD7657SDZ/EVAL-AD7658SDZ
Link No. Position Function
LK1 A Software input is selected.
LK2 A VREF is not buffered.
LK3 A The WR/REFEN/DIS pin is connected to EVAL-SDP-CB1Z.
LK4 Inserted The V1 input is grounded.
LK5 Inserted The V2 input is grounded.
LK6 B The RANGE pin is connected to GND. The input range is set to ±4 × VREF (can be overridden by control registers in software).
LK7 A The STBY pin is connected to VDRIVE. Normal operation is selected.
LK8 C The RESET pin is connected to EVAL-SDP-CB1Z.
LK9 B The W/B pin is connected to GND. Word mode is selected.
LK10 A The BUSY pin is connected to EVAL-SDP-CB1Z.
LK11 B The CONVST A pin is connected to EVAL-SDP-CB1Z.
LK12 A The CS pin is connected to EVAL-SDP-CB1Z.
LK13 A The REFIN/REFOUT signal is sourced from AD780.
LK14 Inserted The V3 input is grounded.
LK15 Inserted The V4 input is grounded.
LK16 A The VDRIVE signal is sourced from the on-board 3.3 V supply. (Requires the EVAL-SDP-CB1Z board to be connected.)
LK17 Inserted The V5 input is grounded.
LK18
Inserted
The V6 input is grounded.
LK19
Removed
An external V
REF
is disconnected.
LK20 B The SER/PAR SEL pin is connected to GND. Parallel mode is selected.
LK21 Removed The AD780 voltage output is 2.5 V.
LK22 Removed The CONVST A and CONVST B pins are not linked.
LK23 A The RD pin is connected to EVAL-SDP-CB1Z.
LK24 Removed An external VREF is disconnected.
LK25 A The DB10/DOUT C pin is connected to EVAL-SDP-CB1Z.
LK26 A The DB7/HBEN/DCEN pin is connected to EVAL-SDP-CB1Z.
LK27 A The DB9/DOUT B pin is connected to EVAL-SDP-CB1Z.
LK28 A The DB8/DOUT A pin is connected to EVAL-SDP-CB1Z.
LK29 A The DB14/REFBUFEN/DIS pin is connected to EVAL-SDP-CB1Z.
LK30 A The DB6/SCLK pin is connected to EVAL-SDP-CB1Z.
LK31 A The DB2/SEL C pin is connected to EVAL-SDP-CB1Z.
LK32 A The DB1/SEL B pin is connected to EVAL-SDP-CB1Z.
LK33 A The DB0/SEL A pin is connected to EVAL-SDP-CB1Z.
LK34
B
The CONVST B pin is connected to EVAL-SDP-CB1Z.
LK35
B
The CONVST C pin is connected to EVAL-SDP-CB1Z.
LK36 Removed The CONVST A and CONVST C pins are not linked.
LK101
A The on-board op amp power is used.
LK102
A The on-board op amp power is used.
LK103 NOPOP
1
The op amp supply rails are set to ±15 V.
LK104 POP1 The op amp supply rails are set to ±15 V.
LK105 POP1 The op amp supply rails are set to ±15 V.
LK106 NOPOP1 The op amp supply rails are set to ±15 V.
LK701 A The on-board AVCC is used.
LK702
A
The on-board DV
CC
is used.
SL1 Removed The REFCAPA and REFCAPB pins are not linked.
SL2 Removed The REFCAPB and REFCAPC pins are not linked.
SL3 to SL14 Removed Not used.
SL15 A The V1 input is buffered.
SL16 A The V2 input is buffered.
SL17 A The V3 input is buffered.
SL18 A The V4 input is buffered.
SL19 A The V5 input is buffered.
SL20
A
The V6 input is buffered.
1 POP = place both 0 Ω resistors; NOPOP = neither 0 Ω resistor is placed.
UG-535 EVAL-AD765xSDZ User Guide
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EVALUATION BOARD CIRCUITRY
ANALOG INPUTS
The V1 to V6 inputs allow a signal to be connected to the board
via SMB connectors.
The analog inputs on the E VA L -AD7656SDZ/E VA L -AD7657SDZ/
E VA L -AD7658SDZ are filtered and buffered by the AD8597 ultra-
low distortion, ultralow noise (single) op amps. Additional filtering
is provided by an R-C filter directly before the AD7656/AD7657/
AD7658 inputs. Alternatively, the op amps can be bypassed, and
the inputs can be fed directly to the AD7656/AD7657/AD7658
via the R-C filter.
REFERENCE OPTIONS
The following two on-board reference supplies are available:
• ADR431: ultralow noise XFET voltage reference with
current sink and source capability
• AD780: 2.5 V/3.0 V ultrahigh precision band gap voltage
reference
Alternatively, the AD7656/AD7657/AD7658 can supply an
internal reference voltage.
SOCKETS/CONNECTORS
Table 4. Socket/Connector Functions
Socket Function
V1 Analog Input V1. Buffered to the V1 pin on the
AD7656/AD7657/AD7658.
V2 Analog Input V2. Buffered to the V2 pin on the
AD7656/AD7657/AD7658.
V3 Analog Input V3. Buffered to the V3 pin on the
AD7656/AD7657/AD7658.
V4 Analog Input V4. Buffered to the V4 pin on the
AD7656/AD7657/AD7658.
V5 Analog Input V5. Buffered to the V5 pin on the
AD7656/AD7657/AD7658.
V6 Analog Input V6. Buffered to the V6 pin on the
AD7656/AD7657/AD7658.
J7 Digital inputs/outputs for standalone operation.
J8 Socket for EVAL-SDP-CB1Z evaluation controller board.
J100 Op amp power supply screw terminal connector.
Supply rails for op amps.
J701 DVCC screw terminal connector.
J702 The 7 V to 9 V dc transformer power connector.
J703 AVCC screw terminal connector.
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 15 of 24
MODES OF OPERATION
SDP CONTROLLED MODE
The AD7656/AD7657/AD7658 uses a high speed parallel interface
that allows sampling rates of up to 250 kSPS. For more information
about the operation of the parallel interface, refer to the AD7656/
AD7657/AD7658 data sheet.
The AD7656/AD7657/AD7658 uses the parallel interface to
transfer data to the E VA L -SDP-CB1Z.
The E VA L -AD7656SDZ/E VA L -AD7657SDZ/E VA L -AD7658SDZ
communicates with the E VA L -SDP-CB1Z board using level
shifters. The E VA L -SDP-CB1Z operates at a 3.3 V logic level,
which allows logic voltages that exceed 3.3 V to be used without
damaging the SDP interface.
STANDALONE MODE
The E VA L -AD7656SDZ/EVA L -AD7657SDZ/E VA L -AD7658SDZ
can also be used without the EVA L -SDP-CB1Z controller board.
In this case, the E VA L -AD7656SDZ/E VA L -AD7657SDZ/E VA L -
AD7658SDZ is connected to the serial interface using the J7
socket. For more information about the operation of the serial
interface, refer to the AD7656/AD7657/AD7658 data sheet.
UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 16 of 24
HOW TO USE THE SOFTWARE FOR EVALUATING THE AD7656/AD7657/AD7658
SETTING UP THE SYSTEM FOR DATA CAPTURE
After completing the steps in the Software Installation Procedures
and Evaluation Board Setup Procedures sections, set up the system
for data capture as follows:
1. Allow the Found New Hardware Wizard to run after the
E VA L-SDP-CB1Z board is plugged into your PC. (If you
are using Windows XP, you may need to search for the
E VA L-SDP-CB1Z drivers. Choose to automatically search
for the drivers for the E VA L-SDP-CB1Z board if prompted
by the operating system.)
2. Check that the board is connected to the PC correctly
using the Device Manager of the PC.
a. Access the Device Manager as follows:
i. Right-click My Computer and then click Manage.
ii. A dialog box appears asking for permission to
allow the program to make changes to your
computer. Click Ye s .
iii. The Computer Management box appears. From
the list of System Tools, click Device Manager
(see Figure 13).
b. Under ADI Development Tools, Analog Devices
System Development Platform (32MB) should
appear, indicating that the E VA L -SDP-CB1Z driver
software is installed and that the board is connected
to the PC correctly.
Figure 13. Device Manager:
Checking that the Board Is Connected to the PC Correctly
Launching the Software
After completing the steps in the Setting Up the System for Data
Capture section, launch the AD7656/AD7657/AD7658 software
as follows:
1. From the Start menu, select Programs > Analog Devices
> AD7656_57_58. The main window of the software then
displays.
2. If the E VA L -AD7656SDZ/EVA L -AD7657SDZ/E VA L -
AD7658SDZ evaluation system is not connected to the
USB port via the E VA L -SDP-CB1Z when the software is
launched, a connectivity error displays (see Figure 14).
Connect the evaluation system to the USB port of the PC,
wait a few seconds, click Rescan, and follow the on-screen
instructions.
Figure 14. Connectivity Error Alert
When the software starts running, it searches for hardware
connected to the PC. A dialog box indicates when the evaluation
board attached to the PC is detected, and then the main window
appears (see Figure 15).
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11338-014
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 17 of 24
Figure 15. Evaluation Software Main Window
CONTROL
CURSOR CONTROL
PANNING
CONTROL
ZOOMING
1
2
5
7
3
4
810
9
11
12
6
11338-015
NOTES
1. FOR DETAILS ABOUT THE AREAS HIGHLIGHTED IN RED, SEE THE OVERVIEW OF THE MAIN WINDOW SECTION.
UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 18 of 24
OVERVIEW OF THE MAIN WINDOW
The main window of the software is shown in Figure 15 and has
the features described in this section.
File Menu (Section 1)
The File menu (labeled 1 in Figure 15) offers the choice to
• Load data: load previously captured data or example files in
.tsv (tab separated values) format for analysis (see Figure 16).
(The default location for example files is C:\Program
Files\Analog Devices\AD7656_57_58\examples.)
• Save Data as .tsv: save captured data in .tsv format for
future analysis (see Figure 17).
• Print Front Panel Picture: print the main window to the
default printer.
• Save Picture: save the current screen capture.
• Exit: close the application.
Figure 16. Load File Dialog Box:
Loading Previously Captured Data or Example Files in .tsv Format
Figure 17. Save File Dialog Box:
Saving Data as .tsv
Part Information Box (Section 2)
The Part Information box (labeled 2 in Figure 15) allows selecting
the generic to be evaluated; choose AD7656, AD7657, or AD7658.
Device Input Range Box (Section 3)
The Device Input Range box (labeled 3 in Figure 15), in con-
junction with hardware settings, is used to select the voltage range.
Resolution Box (Section 4)
The Resolution box (labeled 4 in Figure 15) displays the
resolution of the selected part in bits.
Sampling Rate Box (Section 5)
The default sampling frequency in the Sampling Rate box (labeled 5
in Figure 15) matches the maximum sample rate of the ADC being
evaluated. Although you can adjust the sampling frequency, there
are limitations in terms of the sample frequencies that can be
entered. If an unusable sample frequency is input, the software
automatically adjusts the sample frequency accordingly. Units
can be entered as, for example, 10k for 10,000 Hz. The software
automatically adjusts the sample frequency according to the ability
of the ADC being evaluated. For example, if you enter a value
that is beyond the ability of the device, the software indicates
this and reverts to the maximum sample frequency.
Exit Button (Section 6)
Clicking Exit (labeled 6 in Figure 15) closes the software.
Alternatively, you can select Exit from the File menu.
Tabs Area (Section 7)
There are four tabs available in the tabs area (labeled 7 in Figure 15)
of the main window: Wav eform, Histogram, FFT, and Summary.
These tabs display the data in different formats. Navigation tools
are provided within each tab to allow you to control the cursor,
zooming, and panning (see Figure 15) within the graphs displayed.
Each tab is described in more detail in the Generating a Waveform
Analysis Report; Generating a Histogram of the ADC Code
Distribution; Generating a Fast Fourier Transform of AC
Characteristics; and Generating a Summary of the Waveform,
Histogram, and Fast Fourier Transform sections.
# Samples Box (Section 8)
The # Samples box (labeled 8 in Figure 15) allows you to select
the number of samples to analyze. When Sample or Continuous
is clicked, the software requests this number of samples to be taken.
This is the total number of samples taken on all channels.
Sample Button (Section 9)
Clicking Sample (labeled 9 in Figure 15) performs a single capture,
acquiring a set number of samples at the selected sampling rate.
Continuous Button (Section 10)
Clicking Continuous (labeled 10 in Figure 15) performs a
continuous capture from the ADC. Clicking Continuous a
second time stops sampling.
11338-016
11338-017
EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 19 of 24
Busy LED (Section 11)
The Busy LED (labeled 11 in Figure 15) indicates when a read
from the E VA L-SDP-CB1Z board is in progress.
Channel Display Buttons (Section 12)
Clicking the buttons in this area (labeled 12 in Figure 15) allows
you to display multiple channel reads. (Note that for FFT analysis,
you can select only one channel to be displayed.)
UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 20 of 24
GENERATING A WAVEFORM ANALYSIS REPORT
Figure 18 illustrates the waveform capture tab for a 10 kHz sine
wave input signal.
The Waveform Analysis area (labeled 1 in Figure 18) reports
the amplitudes recorded from the captured signal and the
frequency of the signal tone.
Figure 18. Waveform Tab
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EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 21 of 24
GENERATING A HISTOGRAM OF THE ADC CODE
DISTRIBUTION
The Histogram tab can be used to perform ac testing or, more
commonly, dc testing. This tab shows the ADC code distribution of
the input and computes the mean and standard deviation, which
are displayed as Mean and Transition Noise, respectively, in the
Histogram Analysis area (labeled 1 in Figure 19).
Figure 19 shows the histogram with ac input for a 10 kHz sine
wave applied to the ADC input and the resulting calculations.
AC Input
To perform a histogram test of ac input,
1. Apply a signal source to the selected analog input on the board.
2. Click the Histogram tab from the main window.
3. Click Sample.
Raw data is then captured and passed to the PC for statistical
computations, and various measured values are displayed in the
Histogram Analysis area.
DC Input
A histogram test of dc input can be performed with or without
an external source because the evaluation board has a buffered
VREF/2 source at the ADC input.
To perform a histogram test of dc input,
1. If an external source is being used, apply a signal source to the
selected analog input. It may be required to filter the signal
to ensure that the dc source is noise-compatible with the ADC.
2. Click the Histogram tab from the main window.
3. Click Sample.
Raw data is then captured and passed to the PC for statistical
computations, and various measured values are displayed in the
Histogram Analysis area.
Figure 19. Histogram Tab
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UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 22 of 24
GENERATING A FAST FOURIER TRANSFORM OF
AC CHARACTERISTICS
Figure 20 shows the FFT tab. This feature tests the traditional
ac characteristics of the converter and displays a fast Fourier
transform (FFT) of the results.
To perform an ac FFT test,
1. Apply a sinusoidal signal with low distortion (better than
115 dB) to the evaluation board at the selected analog input.
To attain the requisite low distortion, which is necessary to
allow true evaluation of the part, one option is to
a. Filter the input signal from the ac source. Choose an
appropriate band-pass filter based on the sinusoidal
signal applied.
b. If a low frequency band-pass filter is used when the full-
scale input range is more than a few volts peak-to-peak,
use the on-board amplifiers to amplify the signal, thus
preventing the filter from distorting the input signal.
2. Click the FFT tab from the main window.
3. Click Sample.
As in the histogram test, raw data is then captured and passed
to the PC, which performs the FFT and displays the resulting
SNR, THD, and SINAD.
The Spectrum Analysis box displays the results of the cap-
tured data.
• The area labeled 1 in Figure 20 shows the input signal
information.
• The area labeled 2 in Figure 20 displays the fundamental
frequency and amplitude in addition to the second to fifth
harmonics.
• The area labeled 3 in Figure 20 displays the performance
data, including the SNR, THD, and SINAD.
Figure 20. FFT Tab
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EVAL-AD765xSDZ User Guide UG-535
Rev. 0 | Page 23 of 24
GENERATING A SUMMARY OF THE WAVEFORM,
HISTOGRAM, AND FAST FOURIER TRANSFORM
Figure 21 shows the Summary tab. The Summary tab captures
all the display information and provides it in one panel with a
synopsis of the information, including key performance
parameters such as SNR and THD.
Figure 21. Summary Tab
11338-021
UG-535 EVAL-AD765xSDZ User Guide
Rev. 0 | Page 24 of 24
RELATED LINKS
Resource
Description
AD7656 Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC
AD7657 Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 14-Bit ADC
AD7658 Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 12-Bit ADC
AD8597 Product Page: Ultralow Distortion, Ultralow Noise Op Amp (Single)
AD8031 Product Page: 2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier
ADP1613 Product Page: 650 kHz/1.3 MHz Step-Up PWM DC-to-DC Switching Converter with 2.0 A Current Limit
ADP3303-5 Product Page: High Accuracy anyCAP 200 mA Low Dropout Linear Regulator
ADP2301 Product Page: 1.2 A, 20 V, 1.4 MHz Nonsynchronous Step-Down Switching Regulator
ADM1185 Product Page: Quad Voltage Monitor and Sequencer
ADP190 Product Page: Logic Controlled, High-Side Power Switch
ADG3308 Product Page: Low Voltage, 1.15 V to 5.5 V, 8-Channel Bidirectional Logic Level Translator
ADR431 Product Page: Ultralow Noise XFET 2.5 V Voltage Reference with Current Sink and Source Capability
AD780
Product Page: 2.5 V/3.0 V Ultrahigh Precision Band Gap Voltage Reference
EngineerZone Online Community: Analog Devices Online Technical Support Community
Circuits from the Lab Reference Circuits: Circuit Designs that Have Been Built and Tested to Ensure Function and Performance and that Address
Common Analog, RF/IF, and Mixed-Signal Design Challenges by Applying Analog Devices’ Vast Applications Expertise
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by
and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.
Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
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BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
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registered trademarks are the property of their respective owners.
UG11338-0-7/13(0)
