Evaluation Board User Guide
EVAL-AD7626/25FMCZ
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 AD7626/25 16-Bit, 10/6 MSPS PulSAR Differential ADC
FEATURES
GENERAL DESCRIPTION
Full-featured evaluation board for the AD7626 and AD7625
Versatile analog signal conditioning circuitry
On-board reference, reference buffers, and ADC drivers
System demonstration board compatible (EVAL-SDP-CH1Z)
PC software for control and data analysis of time and
frequency domain
The EVAL-AD7626/25FMCZ is an evaluation board designed
to demonstrate the low power AD7626/25 performance (16-bit,
10/6 MSPS PulSAR® differential ADC) and to provide an easyto-understand interface for a variety of system applications. A
full description of the AD7626 and AD7625 are available in the
data sheet and should be consulted when utilizing this
evaluation board. The user PC software executable controls the
evaluation board over the USB through the Analog Devices, Inc.,
system demonstration platform board (SDP), EVAL-SDP-CH1Z.
EVALUATION KIT CONTENTS
EVAL-AD7626/25FMCZ evaluation board
ADDITIONAL EQUIPMENT AND SOFTWARE
NEEDED
On-board components include the following:
System demonstration platform (EVAL-SDP-CH1Z)
Precision source
World-compatible, 12 V dc supply adapter (enclosed with
EVAL-SDP-CH1Z)
Power supply, +7 V/−2.5 V (optional)
USB cable
SMA cable
ADR3412/ADR4540 high precision, buffered band gap 1.2
V/4.096 V reference options
ONLINE RESOURCES
ADP7102, ADP7104, ADP124, and ADP2300: regulators to
derive necessary voltage levels on board
Documents Needed
AD7626, AD7625 data sheet
EVAL-AD7626/25FMCZ user guide
Required Software
EVAL-AD7626/25FMCZ evaluation software
Design and Integration Files
Schematics, layout files, bill of materials
AD8031: reference buffer
ADA4899-1/ADA4897-1: a signal conditioning circuit with
two op amps and an option to use a differential amplifier
(ADA4932-1)
This evaluation board interfaces to the SDP board via a 160-pin
FMC connector. SMA connectors, JP1/JP4 and JP2/JP5, are
provided for the low noise analog signal source.
TO +12V WALL WART
SIGNAL SOURCE
SMA
CONNECTOR
PC
11228-002
USB
Figure 1. Setting Up the EVAL-AD7626/25FMCZ
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
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EVAL-AD7626_25FMCZ
Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Basic Hardware Setup ...................................................................6
Evaluation Kit Contents ................................................................... 1
Evaluation Board Software ...............................................................7
Additional Equipment and Software Needed ............................... 1
Software Installation .....................................................................7
Online Resources .............................................................................. 1
Launching The Software ..............................................................9
General Description ......................................................................... 1
Software Operation .................................................................... 10
Revision History ............................................................................... 2
WaveForm Capture .................................................................... 12
Functional Block Diagram .............................................................. 3
DC Testing—Histogram ............................................................ 13
Evaluation Board Hardware ............................................................ 4
AC Testing—Histogram ............................................................ 13
Device Description ....................................................................... 4
AC Testing—FFT Capture ........................................................ 14
Hardware Link Options ............................................................... 4
Summary Tab .............................................................................. 16
Power Supplies .............................................................................. 4
Troubleshooting .............................................................................. 17
Serial Interface .............................................................................. 5
Software ....................................................................................... 17
Analog Inputs ................................................................................ 5
Hardware ..................................................................................... 17
Reference Options ........................................................................ 6
Layout Guidelines ......................................................................... 6
REVISION HISTORY
7/14—Revision PrA: Preliminary Version
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EVAL-AD7626_25FMCZ
FUNCTIONAL BLOCK DIAGRAM
+12V
WALL WART
ADP7102
+5V
ADP7104
+12V
ADP2300
+12V
+7V
USB PORT
–VS = –2.5V
ADR4540
+7V
POWER
SUPPLY
CIRCUITRY
ADP124
+4.096V
+4.096V
AD8031
+2.5V
+VS
REFIN
REF
VDD1
VDD2
VIO
CNV±
100Ω
AD4899-1
ADSP-BF527
–VS
IN+
100Ω
D±
AD7626/25
LVDS
INTERFACE
+7V
DCO±
IN–
VIN–
AD4899-1
–VS
GND
CLK±
VCM
100Ω
100Ω
2.5V
+7V
VCM
SPARTAN-6
FPGA
XC6SLX25
AD8031
–VS
EVAL-AD7626/25FMCZ
EVAL-SDP-CH1Z
160-PIN
10mm
VITA 57 CONNECTOR
Figure 2.
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11228-001
VIN+
EVAL-AD7626_25FMCZ
Evaluation Board User Guide
EVALUATION BOARD HARDWARE
DEVICE DESCRIPTION
POWER SUPPLIES
The AD7626/25 are 10/6 MSPS, high precision, power efficient,
16-bit PulSAR ADC that uses SAR-based architecture and does
not exhibit any pipeline delay or latency. The AD7626/25 are
specified for use with 5 V and 2.5 V supplies (VDD1, VDD2).
The interfaces from the digital host to the AD7626/25 use 2.5 V
logic only.
The power (+12 V) for the EVAL-AD7626/25FMCZ board
comes through a 160-pin FMC connector, J7, from the EVALSDP-CH1Z. The customer also has the option of using external
bench top supplies to power the on-board amplifiers. On-board
regulators generate required levels from the applied +12 V rail.
The AD7626/25 use an LVDS interface to transfer data conversions. Complete AD7626/25 specifications are provided in the
product data sheet and should be consulted in conjunction with
this user guide when using the evaluation board. Full details
on the EVAL-SDP-CH1Z are available on the Analog Devices
website.
HARDWARE LINK OPTIONS
The function of the link options are described in Table 1. When
the user first receives the board, the default link setting on the
board are as shown in Table 1 (analog input/reference/power
supplies, and so on).
The ADP7102 (U18) supplies +7 V for the +VS of the ADC
driver amplifiers (ADA4899-1 or ADA4932-1), external reference ADR4540 (U14), while the ADP7104 (U10) delivers +5 V
for VDD1 (U1), external reference ADR3412 (U14), ADP2300
(U5), and ADP124 (U12 and U16). The ADP2300 (U5), in turn,
generates −2.5 V for the amplifier’s –VS and the ADP124 (U12
and U16), in turn, provides a 2.5 V for VDD2 and VIO (U1).
The +3.3 V supply for the EEPROM (U7) comes from the
EVAL-SDP-CH1Z through a 160-pin FMC connector, J7. Each
supply is decoupled where it enters the board and again at each
device. A single ground plane is used on this board to minimize
the effect of high frequency noise interference.
Table 1. Pin Jumper Descriptions
Link
JP1, JP2
JP6
JP10
JP11, JP12
Default
B to center
B to center
B to center
B to center
JP13, JP14
LK2
LK3
LK6
LK9
LK10
B to center
Inserted
Inserted
B
A
A
Purpose
Connect the CNV+ and CNV- from the FPGA. A to center connect the CNV signal from AD9513.
Connects +7 V to amplifier +VS.
Connects −2.5 V to amplifier −VS.
Connects analog inputs VIN+ and VIN− to the inputs of the ADC driver ADA4899-1 or ADA4897-1. A to center
sets the fully differential path through ADA4932-1.
Connect outputs from ADA4899-1 to inputs of ADC. A to center set the fully differential path through ADA4932-1.
Connects REFIN to 1.2 V external reference.
Connects the 4.096V output from ADR4540 after buffer AD8031.
Connects the output of VCM buffer to VCM of amplifier.
Connects to +7 V coming from ADP7102.
Connects to −2.5 V coming from ADP2300.
Table 2. On-Board Connectors
Connector
J1
J2, J10
J3, J5, J6, J8
Function
SMA low noise, low jitter clock source input.
SMA CNV Input, this option is for using external CNV signal.
SMA Analog Input. Connects the low noise analog signal source to the inputs of the ADC driver ADA4899-1, ADA4897-1, or
ADA4932-1.
J4
3-Pin Terminal. This option is for using external bench top supplies. Apply external +Vs, −Vs, and GND to power amplifiers on
the EVAL-AD7626/25FMCZ board.
6-Pin (2 × 3) Socket. This option is for interfacing with an external ADC driver board.
160-Pin FMC 10 mm Male VITA 57 Connector. This connector mates with the EVAL-SDP-CH1Z board.
SMA low noise, low jitter clock output from AD9513.
J9
J7
J11, J12
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EVAL-AD7626_25FMCZ
Table 3. On-Board Power Supplies Description
Power Supply
+VS
Voltage Range (V)
+5 V to +7 V
−VS
−2 V to −5 V
|+VS to −VS|
VDD1
VDD2, VIO
12 V1
5 V2
2.5 V2
Purpose
ADP7104 (U10) and ADP7102 (U18) generate the necessary +5 V and +7 V, respectively, from
+12 V coming from EVAL-SDP-CH1Z. The +7 V supply is recommended for on-board amplifier +VS.
The +5 V supply is provided to VDD1 (U1), external reference ADR3412 (U14), ADP2300 (U5), and
ADP124 (U12 and U16). The user also has an option to use an external bench top supply +VS
through J4.
ADP2300 generates −2.5 V for amplifier −VS. The user also has an option to use an external bench
top supply −VS through J4.
Maximum range of supply for correct operation.
AD7626/25 Analog Supply Rail.
ADC Supply Rails.
1
Dictated by ADA4899-1 supply operation.
Refer to the AD7626 , AD7625 data sheet
2
SERIAL INTERFACE
The EVAL-AD7626/25FMCZ uses the serial interface
connection to the EVAL-SDP-CH1Z. The EVAL-AD7626/25FMCZ operates only in echo-clocked serial interface mode.
This mode requires three LVDS pairs (D±, CLK±, and DCO±)
between AD7626/25 and the digital host. The EVAL-SDPCH1Z board features include
XILINX Spartan®-6 FPGA
DDR2
Micron MT47H32M16Hr-25E:G
−8 Mb × 16 bits × 4 Banks(512 Mb/64 Mb)
SRAM
ISSI IS61WV25616BLL-10BLI
–256 kB × 16 bits (4 Mb/512 kB)
1 × 160-pin FMC-LPC connector (refer to the VITA 57
specification)
Samtec ASP-134603-01
Up to 1080 Mbps LVDS
Single-ended LVCMOS
Power
Analog Devices ADSP-BF527 Blackfin® processor
Core performance up to 600 MHz
208-ball CSP-BGA package
24 MHz CLKIN oscillator
32 Mb flash memory
Numonyx M29W320EB or
Numonyx M25P32
SDRAM memory
Micron MT48LC16M16A2P-6A
−16 Mb × 16 bits (256 Mb/32 MB)
2 × 120-pin small foot print connectors
Hirose FX8-120P-SV1(91),120-pin header
Blackfin processor peripherals exposed
SPI
SPORT
TWI/I2C
GPIO
PPI
Asynchronous parallel
ANALOG INPUTS
This section provides information on the analog input options
and how these options can be configured as well as information
on how customers should connect their signal source.
The analog inputs applied to the EVAL-AD7626/25FMCZ
board are J3 and J5 SMA (push-on) connectors. These inputs
are buffered with dedicated discrete driver amplifier circuitry
(U13 and U15 or U6) as shown in Figure 1.
The circuit allows for different configurations, input range
scaling, filtering, the addition of a dc component, and the use
of a different op amp, and a differential amplifier and supplies.
The analog input amplifiers are set as unity gain buffers at the
factory. The driver amplifiers (U6, U13, and U15) positive rails
are driven from +7 V (from ADP7102, U18) and negative rail
from −2.5 V; the other reference buffers (U8 and U11) positive
rails are driven from +7 V and negative rails are grounded;
these could be changed to a different value as required.
The range of supplies possible is listed in Table 3. The default
configuration sets both U13 and U15 at mid-scale generated
from a buffered reference voltage (VCM) of the AD7626/25
(U1). The evaluation board is factory configured for providing
either a single-ended path or a fully differential path as
described in Table 1.
For dynamic performance, an FFT test can be performed by
applying a very low distortion source.
For low frequency testing, the audio precision source can be
used directly because the outputs on these are isolated. Set the
outputs for balanced and floating. Different sources can be used
though most are single ended and use a fixed output resistance.
Since the evaluation board uses the amplifiers in unity gain,
the noninverting input has a common-mode input with a series
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EVAL-AD7626_25FMCZ
Evaluation Board User Guide
1K Ω resistor and it needs to be taken into account when
directly connecting a source (voltage divider).
REFERENCE OPTIONS
BASIC HARDWARE SETUP
The AD7626/25has an internal 4.096V reference along with
and internal buffer useful for using an external reference or can
use directly an external 4.096V reference. The evaluation board
can be configured to use any of these references. For using the
internal ADC reference, leave LK2 and LK3 open. To use the
ADR4540, insert LK3, let LK2 open. (The 4.096V output of the
ADR4540 is buffered by an AD8031in a unity gain
configuration).
The AD7626/25 evaluation board connects to the (EVAL-SDPCH1Z) system demonstration board. The EVAL-SDP-CH1Z
board is the controller board, which is the communication link
between the PC and the main evaluation board.
For using the internal reference buffer on the AD7626/25
REFIN pin, insert LK2, let LK3 open. The 1.2V reference
voltage applied to REFIN, prior to the internal buffer in the
AD7626/25device, which creates the required internal 4.096V.
(The 1.2V output of the ADR3412 is buffered by an AD8031in
a unity gain configuration). The various options for using this
reference are controlled by the EN1 and EN0 pins (EN bits on
software) as described in detail in the AD7626/25 data sheet.
Figure 1 shows a photograph of the connections made between
the EVAL-AD7626/25FMCZ daughter board and the EVALSDP-CH1Z board.
1.
2.
LAYOUT GUIDELINES
When laying out the printed circuit board (PCB) for the
AD7626/25, follow the recommended guidelines described in
this section to obtain the maximum performance from the
converter.
Solder the AD7626/25 exposed paddle (Pin 33) directly to
the PCB and connect the paddle to the ground plane of
the board using multiple vias.
Decouple all the power supply pins (VDD1, VDD2, and
VIO) and the REF pin with low ESR and low ESL ceramic
capacitors, typically 10 μF and 100 nF, placed close to the
DUT (U1) and connected using short, wide traces. This
provides low impedance paths and reduces the effect of
glitches on the power supply lines.
Use a 50 Ω single-ended trace and a 100 Ω differential
trace.
Separate analog and digital sections and keep power supply
circuitry away from the AD7626/25.
Avoid running digital lines under the device as well as
crossover of digital and analog signals because these couple
noise into the AD7626/25.
Fast switching signals, such as CNV or clocks, should not
run near analog signal paths.
Remove the ground and power plane beneath the input
(including feedback) and output pins of the amplifiers (U6,
U13, and U15) since they create an undesired capacitor.
3.
4.
5.
Rev. PrA | Page 6 of 19
Install the AD7626/25 software. Ensure the EVAL-SDPCH1Z board is disconnected from the USB port of the PC
while installing the software. The PC must be restarted
after the installation.
Before connecting power, connect the EVAL-AD7626/25FMCZ board’s 160-pin FMC connector, J7, to the
connector J4 on the EVAL-SDP-CH1Z board. Nylon
screws are included in the EVAL-AD7626/25FMCZ
evaluation kit and can be used to ensure the EVALAD7626/25FMCZ and the EVAL-SDP-CH1Z boards are
connected firmly together.
Connect the +12 V power supply adapter included in the
kit to the EVAL-SDP-CH1Z.
Connect the EVAL-SDP-CH1Z board to the PC via the
USB cable. Windows XP users may need to search for the
EVAL-SDP-CH1Z drivers. Choose to automatically search
for the drivers for the EVAL-SDP-CH1Z board if prompted
by the operating system.
Launch the EVAL-AD7626/25FMCZ software from the
Analog Devices subfolder in the Programs menu. The full
software installation procedure is detailed in the
Evaluation Board Software section.
Evaluation Board User Guide
EVAL-AD7626_25FMCZ
EVALUATION BOARD SOFTWARE
SOFTWARE INSTALLATION
The evaluation board software is available to download from
the evaluation board page on Analog Devices website. Click
the setup.exe file to run the install. The default location for the
software is C:\Program Files (x86)\Analog Devices\
AD7626_25 Evaluation Software.
Install the evaluation software before connecting the evaluation
board and EVAL-SDP-CH1Z board to the USB port of the PC
to ensure that the evaluation system is correctly recognized when
connected to the PC.
Figure 5. AD7626/25 Install Window 2
-006
AD7626/25 evaluation board software installation
EVAL-SDP-CH1Z board driver installation
Figure 3 to Figure 9 show the separate steps to install the
AD7626/25 evaluation software while Figure 10 to Figure 14
show the separate steps to install the EVAL-SDP-CH1Z drivers.
Proceed through all of the installation steps to allow the software and drivers to be placed in the appropriate locations.
Only after the software and drivers have been installed, should
you connect the EVAL-SDP-CH1Z board to the PC.
-005
There are two parts of the software installation process:
-003
Figure 6. AD7626/25 Install Window 3
-007
Figure 3. User Account Control
-004
Figure 7. AD7626/25 Install Window 4
Figure 4. AD7626/25 Install Window 1
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-011
-008
EVAL-AD7626_25FMCZ
Figure 11. EVAL-SDP-CH1Z Drivers Setup Window 2
Figure 9. AD7626/25 Install Window 6
-012
-009
Figure 8. AD7626/25 Install Window 5
-013
Figure 12. EVAL-SDP-CH1Z Drivers Setup Window 3
-010
Figure 13. EVAL-SDP-CH1Z Drivers Setup Window 4
Figure 10. EVAL-SDP-CH1Z Drivers Setup Window 1
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Evaluation Board User Guide
EVAL-AD7626_25FMCZ
LAUNCHING THE SOFTWARE
Once the EVAL-AD7626/25FMCZ and EVAL-SDP-CH1Z are
correctly connected to your PC, the AD7626/25 software can be
launched.
1.
-014
2.
3.
From the Start menu, select Programs>Analog Devices>
AD7626_25 Evaluation Software. The main window of
the software then displays (see Figure 19).
If the evaluation system is not connected to the USB port
via the EVAL-SDP-CH1Z when the software is launched, a
connectivity error displays (see Figure 17).
Connect the evaluation board to the USB port of the PC.
Wait for a few seconds and then click Rescan (see
Figure 18.
-015
Figure 14. EVAL-SDP-CH1Z Drivers Setup Window 5
-017
Figure 15. EVAL-SDP-CH1Z Drivers Setup Window 6
After installation is complete, connect the EVALAD7626/25FMCZ to the EVAL-SDP-CH1Z as described in the
Evaluation Board Hardware section.
Figure 17. Connectivity Error Alert 1
When you first plug in the EVAL-SDP-CH1Z board via the USB
cable provided, allow the new Found Hardware Wizard to run.
Once the drivers are installed, you can check that the board has
connected correctly by looking at the Device Manager of the PC.
The Device Manager can be accessed via My Computer>
Manage>Device Manager from the list of System Tools. The
EVAL-SDP-CH1Z board should appear under ADI
Development Tools.
-018
This completes the installation.
-016
Figure 18. Connectivity Error Alert 2
Figure 16. Device Manager
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Evaluation Board User Guide
SOFTWARE OPERATION
sample frequency 10M/6M), the software indicates this and the
user must revert to the maximum sample frequency.
This section describes the full software operation and all
windows that appear. When the software is launched, the panel
opens and the software searches for hardware connected to the
PC. The user software panel launches as shown in Figure 19.
The labels listed in this section correspond to the numbered
labels in Figure 19.
Samples (Label 5)
File Menu (Label 1)
Single Capture (Label 6) and Continuous Capture
(Label 7)
The File menu, labeled 1 in Figure 19, offers the choice to
Save Captured Data: saves data to a .csv file
Load Captured Data: loads data for analysis
Take Screenshot: saves the current screen
Print: prints the window to the default printer
Exit: quits the application
Select the number of Samples to analyze, when running the
software; this number is limited to 1,048,576 samples.
Single Capture performs a single capture whereas Continuous
Capture performs a continuous capture from the ADC.
Eval Board Connected (Label 8)
This indicator shows that the device connected.
Voltage Reference (Label 9)
Edit Menu (Label 2)
Help Menu (Label 3)
The various options for using the external reference are
controlled by the Voltage Reference option. The default value
is set to 4.096 V (Internal Reference). The other options are
External Reference 4.096V, External 1.2V and Power Down.
It is recommended to use an on-board AD8031 as an external
reference buffer.
The Help menu, labeled 3, offers help from the
PLL Enable ( Lable 10)
This option is used when the CNV signal is coming from
AD9513, at the same time, you need change the JP1 and JP2
selection to A to center.
The Edit menu, labeled 2, provides the following offering:
Initialize to Default Values: This option resets the
software to its initial state
Analog Devices website
User Guide
Context Help
About
Tabs
Throughput (Label 4)
The default throughput (sampling frequency) is 10,000 kilo
samples per second (kSPS) for AD7626, and 6,000 kilo samples
per second (kSPS) for AD7625.The user can adjust the sampling
frequency, however there are limitations around the sample
frequency related to the SCLK frequency applied; the sample
frequency must be at least 500 kSPS. If the user enters a value
larger than the ability of the ADC (AD7626/25, maximum
There are four additional tabs available for displaying the data
in different formats.
Waveform
Histogram
FFT
Summary
To exit the software, go to File>Exit.
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Evaluation Board User Guide
2
3
5
8
6
7
9
4
10
11228-019
1
EVAL-AD7626_25FMCZ
Figure 19. Setup Screen
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Evaluation Board User Guide
WAVEFORM CAPTURE
Figure 20 illustrates the Waveform tab. The 20 kHz sine-wave
input signal was used along with an on-board 4.096 V external
reference.
Note that Label 1 shows the Waveform Analysis which reports
the amplitudes recorded from the captured signal in addition to
the frequency of the signal tone.
CONTROL CONTROL CONTROL
CURSOR ZOOMING PANNING
-020
1
Figure 20. Waveform Capture Tab
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EVAL-AD7626_25FMCZ
DC TESTING—HISTOGRAM
AC TESTING—HISTOGRAM
The histogram is most often used for dc testing where a user
tests the ADC for the code distribution for dc input and
computes the mean and standard deviation, or transition noise,
of the converter, and displays the results. Raw data is captured
and passed to the PC for statistical computations.
Figure 21 shows the Histogram tab. This tests the ADC for
the code distribution for ac input and computes the mean and
standard deviation, or transition noise, of the converter and
displays the results. Raw data is captured and passed to the PC
for statistical computations.
To perform a histogram test,
To perform a histogram test,
1.
Select the Histogram tab.
1.
Select the Histogram tab.
2.
Click Single Capture or Continuous Capture.
2.
Click Single Capture or Continuous Capture.
Note that a histogram test can be performed without an
external source since the evaluation board has a buffered VREF/2
source at the ADC input.
To test other dc values, apply a source to the J3/J5 inputs. You
may be required to filter the signal to make the dc source noise
compatible with that of the ADC.
Note that an AC histogram needs a quality signal source applied
to the input J3/J5 connectors.
Figure 21 shows the histogram for a 20 kHz sine wave applied
to the ADC input and the results calculated.
The Histogram Analysis (Label 1) illustrates the various
measured values for the data captured.
-021
1
Figure 21. Histogram Capture Tab
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Evaluation Board User Guide
AC TESTING—FFT CAPTURE
Figure 22 shows the FFT tab. This tests the traditional ac
characteristics of the converter and displays a fast Fourier
transform (FFT) of the results. As in the histogram test, raw
data is captured and passed to the PC where the FFT is
performed displaying SNR, SINAD, THD, and SFDR.
Furthermore, if using a low frequency band-pass filter when
the full-scale input range is more than a few V p-p, it is
recommended to use the on-board amplifiers to amplify the
signal, thus preventing the filter from distorting the input signal.
To perform an ac test, apply a sinusoidal signal to the evaluation
board at the SMA inputs J3/J5. Very low distortion, better than
130 dB input signal source (such as audio precision) is required
to allow true evaluation of the part. One possibility is to filter
the input signal from the ac source. There is no suggested bandpass filter, but carefully consider the choices.
Figure 22 displays the results of the captured data.
Shows the input signal information (see Label 1)
Displays the fundamental frequency and amplitude in
addition to the 2nd to 5th harmonics (see Label 2)
Displays the performance data, including SNR, dynamic
range, THD, SINAD, and noise performance (see Label 3)
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EVAL-AD7626_25FMCZ
1
3
-022
2
Figure 22. FFT Capture Tab
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EVAAL-AD76266_25FMCZZ
Evaaluation BBoard User Guide
SUM
MMARY TAB
Figuree 23 shows the Summary
S
tab which
w
captures all
a the display
inform
mation and provvides it in one panel
p
with a syn
nopsis of the
informaation, includingg key performan
nce parameters, such as
SNR an
nd THD.
Figure 233. Summary Tab
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EVAL-AD7626_25FMCZ
TROUBLESHOOTING
This section provides hints on how to prevent problems and
what to check when you encounter problems with the software
and hardware.
SOFTWARE
Review the following points regarding software:
Always install the software prior to connecting the
hardware to the PC.
Always allow the install to fully complete (the software
installation is a two-part process: installing the ADC
software and the SDP drivers). This may require a restart.
When you first plug in the EVAL-SDP-CH1Z board via
the USB cable provided, allow the new Found Hardware
Wizard to run. Though this may take time, do this prior
to starting the software.
If the board does not appear to be functioning, ensure that
the ADC evaluation board is connected to the EVAL-SDPCH1Z board and that the board is recognized in the
Device Manager, as shown in Figure 7.
If connected to a slower USB port where the EVAL-SDPCH1Z cannot read quickly, a timeout error may occur.
In this case, it is advised not to read continuously or,
alternatively, to lower the number of samples taken.
Note that when reading continuously from the ADC,
the recommended number of samples is up to 1,048,576.
HARDWARE
If the software does not read any data back,
With the +12 V wall wart plugged in to the EVAL-SDPCH1Z board, check to make sure that the voltage applied is
within the ranges shown in Table 3.
Using a DMM, measure the voltage present at +12 V and
the VADJ test points, which should read +12 V and 2.5 V,
respectively. The +12V_FMC LED of the EVALAD7626/25FMCZ board and the LEDs of the EVAL-SDPCH1Z board (FMC_PWR_GO, SYS_PWR, FPGA_DONE,
BF_POWER, LED0, and LED2) should all be lit.
Launch the software and read the data. If nothing happens,
exit the software.
Remove the +12 V wall wart and USB from the EVALSDP-CH1Z board and then reconnect them and relaunch
the software.
If this is not successful, confirm that the EVALAD7626/25FMCZ and EVAL-SDP-CH1Z boards are
connected together so that the EVAL-AD7626/25FMCZ is
recognized in the Device Manager, as shown in Figure 7.
Note that when working with the software in standalone/offline
mode (no hardware connected), if you later choose to connect
hardware, first close and then re-launch the software.
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EVAL-AD7626_25FMCZ
Evaluation Board User Guide
NOTES
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
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS 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
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2014 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
000
Rev. PrA | Page 18 of 19
Evaluation Board User Guide
EVAL-AD7626_25FMCZ
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
Rev. PrA | Page 19 of 19
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