ADP7104ARDZ-33 [ADI]
EVAL-AD7903SDZ User Guide UG-609;
| 型号： | ADP7104ARDZ-33 |
| 厂家： | 
ADI |
| 描述： | EVAL-AD7903SDZ User Guide UG-609 |
| 文件： | 总32页 (文件大小：2099K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVAL-AD7903SDZ User Guide
UG-609
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 AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC
FEATURES
ADDITIONAL EQUIPMENT/SOFTWARE NEEDED
Full featured evaluation board for the AD7903
Versatile analog signal conditioning circuitry
On-board reference, reference buffers, and ADC drivers
System demonstration board compatible (EVAL-SDP-CB1Z)
PC software for control and data analysis of time and
frequency domain
System demonstration platform (EVAL-SDP-CB1Z)
Precision analog signal source
Power supply, +7 V/−2.5 V (optional)
USB cable
SMA cable
PC running Windows XP SP2, Windows Vista, Windows 7, or
higher with USB 2.0 port
Evaluation software for the AD7903 (download from
AD7903 product page)
EVALUATION KIT CONTENTS
EVAL-AD7903SDZ evaluation board
Wall power supply 9 V dc adapter
Daughter card power connector
ONLINE RESOURCES
Documents Needed
AD7903 data sheet
EVAL-AD7903SDZ user guide
Required Software
EVAL-AD7903SDZ evaluation software
FAQs and Troubleshooting
TYPICAL SETUP
SMA
CONNECTOR
SIGNAL SOURCE
PC
Figure 1. Typical Setup for the EVAL-AD7903SDZ
(EVAL-AD7903SDZ on Left and EVAL-SDP-CB1Z on Right)
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
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TABLE OF CONTENTS
Features .............................................................................................. 1
Modes of Operation ....................................................................... 12
SDP Controlled Mode ............................................................... 12
Standalone Mode........................................................................ 12
How to Use the Software ............................................................... 13
Evaluation Kit Contents................................................................... 1
Additional Equipment/Software Needed ...................................... 1
Online Resources.............................................................................. 1
Typical Setup ..................................................................................... 1
Revision History ............................................................................... 2
General Description......................................................................... 3
Getting Started.................................................................................. 4
Software Installation Procedures................................................ 4
Evaluation Board Setup Procedures........................................... 7
Evaluation Board Hardware............................................................ 8
Device Description....................................................................... 8
Power Supplies .............................................................................. 8
Link Configuration Options ......................................................... 10
Evaluation Board Circuitry ........................................................... 11
Analog Inputs.............................................................................. 11
Reference ..................................................................................... 11
Serial Interface ............................................................................ 11
Setting Up the System for Data Capture:
Board Operation/Connection Sequence................................. 13
Starting the Software.................................................................. 13
Overview of the Main Window................................................ 15
Generating a Waveform Analysis Report................................ 16
Generating a Histogram of the ADC Code Distribution ..... 17
Generating a Fast Fourier Transform of AC Characteristics ......18
Generating a Summary of the Waveform, Histogram, and
Fast Fourier Transform.............................................................. 19
Evaluation Board Schematics and Artwork................................ 20
EVAL-AD7903SDZ Schematics ............................................... 20
EVAL-AD7903SDZ Layout....................................................... 25
Bill of Materials............................................................................... 28
Related Links................................................................................... 30
REVISION HISTORY
1/14—Revision 0: Initial Version
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GENERAL DESCRIPTION
The EVAL-AD7903SDZ is an evaluation board designed to
demonstrate the low power AD7903 performance and to
provide an easy to understand interface for a variety of system
applications. The AD7903 is a dual differential 16-bit, 1 MSPS
PulSAR® ADC. A full description of the AD7903 is available in
the AD7903 data sheet and should be consulted when using this
evaluation board.
connector. SMA Connectors J6, J7, J10, and J15 are provided to
connect a low noise analog signal source.
The user PC software executable controls the evaluation board
over the USB through the SDP board, EVAL-SDP-CB1Z.
On-board components include the following:
ADR435: high precision, buffered band gap 5.0 V reference
AD8031: reference buffer
ADA4841-1: signal conditioning circuit with op amps
ADP7104 and ADP2301: regulators to derive necessary voltage
levels on board
The evaluation board is ideal for use with the Analog Devices, Inc.,
system demonstration platform (SDP) board, EVAL-SDP-CB1Z.
The evaluation board interfaces to the SDP board via a 120-pin
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GETTING STARTED
4. Select the location to install the software, and then click
Next. (The default location is C:\Program Files (x86)\
Analog Devices\AD7902_03 Evaluation Software\.
This location also contains the executable software and
example files.)
SOFTWARE INSTALLATION PROCEDURES
The evaluation board software can be downloaded from the
AD7903 product page on the Analog Devices website, at
www.analog.com.
There are two parts to the installation:
•
•
AD7903 evaluation board software installation
EVAL-SDP-CB1Z system demonstration platform board
drivers installation
Warning
The evaluation board software and drivers must be installed
before connecting the evaluation board and EVAL-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 AD7903 Evaluation Board Software
To install the AD7903 evaluation board software,
1. Start the Windows operating system and download the
software from the AD7903 product page on the Analog
Devices website, at www.analog.com.
2. Unzip the downloaded file.
3. Double-click the setup.exe file to begin the evaluation
board software installation (see Figure 2).
Figure 3. AD7903 Evaluation Board Software Installation:
Selecting the Location for Software Installation
(the Default Location Is Shown)
5. A license agreement appears. Read the agreement, and then
select I accept the License Agreement and click Next.
Figure 2. AD7903 Evaluation Board Software Installation: Installation Begins
Figure 4. AD7903 Evaluation Board Software Installation:
Accepting the License Agreement
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6. A summary of the installation is displayed. Click Next to
8. The dialog box informs you when the installation is
continue.
complete. Click Next.
Figure 7. AD7903 Evaluation Board Software Installation:
Indicating When the Installation Is Complete
Figure 5. AD7903 Evaluation Board Software Installation:
Reviewing a Summary of the Installation
9. The setup for the installation of the EVAL-SDP-CB1Z
system demonstration platform board drivers auto-
matically begins to load.
7. A dialog box shows the installation progress.
Figure 8. Loading the Setup for SDP Drivers Installation
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 EVAL-
SDP-CB1Z system demonstration platform board drivers.
1. Make sure that all other applications are closed, and then
click Next.
Figure 6. AD7903 Evaluation Board Software Installation:
Displaying Installation Progress
Figure 9. EVAL-SDP-CB1Z Drivers Setup:
Beginning the Drivers Installation
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2. Select the location to install the drivers, and then click Install.
5. To complete the drivers installation, click Finish, which
closes the installation wizard.
Figure 10. EVAL-SDP-CB1Z Drivers Setup:
Selecting the Location for Drivers Installation
Figure 13. EVAL-SDP-CB1Z Drivers Setup:
Completing the Drivers Setup Wizard
3. Installation of the SDP drivers begins.
6. 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 14. EVAL-SDP-CB1Z Drivers Setup:
Restarting the Computer
Figure 11. EVAL-SDP-CB1Z Drivers Setup:
Beginning the Installation
4. A dialog box appears asking whether you would like to
install this device software. Click Install to confirm that
you would like to install the drivers.
Figure 12. EVAL-SDP-CB1Z Drivers Setup:
Granting Permission to Install Drivers
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Verifying the Board Connection
EVALUATION BOARD SETUP PROCEDURES
1. Allow the Found New Hardware Wizard to run after the
EVAL-SDP-CB1Z board is plugged into your PC. (If you
are using Windows XP, you may need to search for the
EVAL-SDP-CB1Z drivers. Choose to automatically search
for the drivers for the EVAL-SDP-CB1Z board if prompted
by the operating system.)
The AD7903 evaluation board connects to the (EVAL -SDP-CB1Z)
system demonstration board. The EVAL-SDP-CB1Z board is
the controller board, which is the communication link between
the PC and the main evaluation board.
Figure 1 shows a photograph of the connections made between
the EVAL -AD7903SDZ daughter board and the EVAL -SDP-CB1Z
motherboard.
2. Check that the board is connected to the PC correctly
using the Device Manager of the PC.
Connecting the Evaluation and SDP Boards to a 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
1. Install the AD7903 software. Ensure that the EVAL-SDP-CB1Z
board is disconnected from the USB port of the PC while
installing the software. The PC must be restarted after the
installation is complete.
computer. Click Yes.
iii. The Computer Management box appears. From
the list of System Tools, click Device Manager.
b. Under ADI Development Tools, Analog Devices
System Development Platform SDP-B should appear
(see Figure 15), indicating that the EVAL-SDP-CB1Z
driver software is installed and that the board is
connected to the PC correctly.
2. Before connecting power, connect the 120-pin connector, J5,
of the EVAL-AD7903SDZ board to Connector J4 on the
EVAL-SDP-CB1Z board. Nylon screws are included in the
EVAL-AD7903SDZ evaluation kit and can be used to
ensure that the EVAL-AD7903SDZ and EVAL-SDP-CB1Z
boards are connected firmly together.
3. Connect the 9 V power supply adapter included in the kit
to the EVAL-SDP-CB1Z.
4. Connect the EVAL-SDP-CB1Z board to the PC via the
USB cable. (If you are using Windows® XP, you may need to
search for the EVAL-SDP-CB1Z drivers. Choose to auto-
matically search for the drivers for the EVAL-SDP-CB1Z
board if prompted by the operating system.)
Figure 15. Device Manager:
Checking that the Board Is Connected to the PC Correctly
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EVALUATION BOARD HARDWARE
DEVICE DESCRIPTION
Each on-board power supply is decoupled where it enters the
board as well as where it connects to each device. A single ground
plane is used on this board to minimize the effect of high frequency
noise interference.
The AD7903 is a 16-bit, 1 MSPS, precision, power efficient, dual
differential PulSAR ADC that uses SAR-based architecture and
does not exhibit any pipeline delay or latency. The AD7903 is
specified for use with a single supply of 2.5 V (VDD1, VDD2).
The interface from the digital host to the AD7903 uses 1.8 V/
2.5 V/3.3 V/5.5 V logic. The AD7903 is compatible with the
SPI/QSPI/MICROWIRE/DSP serial interface to transfer data
conversions. Complete AD7903 specifications are provided in
the AD7903 data sheet and should be consulted in conjunction
with this user guide when using the evaluation board. Full
details on the EVAL-SDP-CB1Z are available on the Analog
Devices website, at www.analog.com.
Alternatively, the board can be powered from a bench top power
supply by using the J2 and J3 screw terminals and changing the
SL1 to SL4 and LK3 to LK5 solder link settings to Position B (see
Table 2). When bench top power is used, use of the wall adapter
and the on-board power supplies are no longer required.
Table 2. Solder Links—Settings for Bench Top Power Supply1
Link
SL1
SL2
SL3
SL4
LK3
LK4
LK5
Setting
Function
B
B
B
B
B
B
B
+VS
−VS
−VS
+VS
V_SDP
VREF
VDD for ADC
Figure 26 to Figure 31 show the evaluation board schematics.
The board consists of an AD7903 ADC (U1) with a reference
(U6—ADR435), and several ADC drivers (U12, U14, U16, and
U17—ADA4841-1YRZ). The evaluation board is a flexible
design that enables you to adjust compensation components
and operate the evaluation board from an adjustable bench top
power supply.
1 All other solder link settings are as described in Table 3.
POWER SUPPLIES
The evaluation board can be powered from a wall adapter or
from a bench top power supply. By default, the board is set up
to operate from a 9 V wall adapter using the on-board power
supplies described in Table 1.
Table 1. Power Supplies Provided on the Board
Power Supply (V) Function
Components Used
+5
SDP power
Positive rail
Negative rail
ADC VDD rail
ADP2301
+7.5
−2.5
+2.5
+3.3
ADP7104
ADP2301
ADP7104
VDRIVE (digital power) ADP7104
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V
= 9V
IN
WALL ADAPTER
(OPTIONAL)
–V
S
POWER SUPPLY CIRCUITRY
ADP7104, ADP2301
GND
+V
S
+7.5V/–2.5V
2.5V
+7.5V 3.3V +5V
(OPTIONAL)
+5V
VDD
ADR435
5V
GND
VSDP
VCM
AD8031
ADSP-BF527
DSP
+7.5V
ADA4841-1
ADA4841-1
REF1 VIO1
SDI1
VDD1
IN1+
VIN1+
VIN1–
–2.5V
+7.5V
SCK1
ADC1
SDO1
CNV1
IN1–
GND
GLUE
A
B
LOGIC
–2.5V
2.5V
5V
SPORT
ADA4841-1
ADA4841-1
+7.5V
REF2 VIO2
SDI2
VDD2
IN2+
VIN2+
VIN2–
–2.5V
+7.5V
SCK2
ADC2
SDO2
CNV2
IN2–
GND
GLUE
LOGIC
A
B
–2.5V
AD7902/AD7903 PulSAR EVALUATION BOARD
SDP BOARD
Figure 16. Simplified Evaluation Board Functional Block Diagram
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EVAL-AD7903SDZ User Guide
LINK CONFIGURATION OPTIONS
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.
When operating in SDP controlled mode, ensure that VIO is
3.3 V. Operating with a VIO greater than 3.3 V in SDP controlled
mode may damage the SDP board.
The Default Position column of 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 3. Solder Links—Factory Default Settings
Link
SL1
SL2
SL3
SL4
SL5
SL6
LK3
LK4
LK5
LK6
Setting
Function
Comment
A
A
A
A
A
A
A
A
A
A
+VS
−VS
−VS
+VS
Change to B if using bench supplies.
Change to B if using bench supplies.
Change to B if using bench supplies.
Change to B if using bench supplies.
Do not alter.
Analog input
Analog input
V_SDP
VREF
VDD for ADC
U12 output connects to
U14 input
Do not alter.
Change to B if using bench supplies.
Change to B if using bench supplies.
Change to B if using bench supplies.
Change to B if U14 inverting input needs to be connected to ground.
LK7
A
U17 output connects to
U16 input
Change to B if U16 inverting input needs to be connected to ground.
LK8
LK9
LK10
LK11
LK12
A
A
A
A
A
ADC2 input
ADC2 input
U17 input
U17 input
U16 input
Change to B if using ADC1 input.
Change to B if using ADC1 input.
Change to B if U17 needs to be bypassed.
Change to B if U17 needs to be bypassed.
Change to B if U16 needs to be bypassed.
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EVALUATION BOARD CIRCUITRY
a balanced and floating ground. Different sources can be used;
however, most are single-ended sources that use a fixed output
resistance.
ANALOG INPUTS
The analog inputs to the evaluation board are SMA Connectors J6,
J7, J10, and J15. These inputs are buffered with dedicated amplifier
circuitry (U12, U14, U16, and U17), as shown in Figure 26 and
Figure 27. The circuit not only allows different configurations,
input range scaling, and filtering but also allows adding a dc
component and using different op amps and supplies. The analog
input amplifiers are set as unity-gain buffers by factory default.
The amplifier positive rail is driven from 7.5 V (from U13—
ADP7104). The negative amplifier rail is driven from –VS
(generated by U3—ADP2301).
By default, the evaluation board uses the amplifiers as unity-gain
buffers. The noninverting input has a common-mode adjustment
that involves a 49.9 kΩ shunt resistor. This resistor creates a
voltage divider with the source, which must be accounted for
when using the board.
REFERENCE
An external 5 V reference (U6—ADR435) is used to supply the
ADCs directly.
The default configuration sets all op amps (U12, U14, U16, and
U17) at midscale, generated from a buffered reference voltage
divider (VCM).
SERIAL INTERFACE
The evaluation board uses the SPORT interface from the
ADSP-BF527 D S P.
The evaluation board is configured by factory default for providing
a differential analog input path to ADC1 and ADC2 (see Figure 16).
Multiple AND gates (U9, U10, and U11) are used to clock and
gate the SPORT transfer to the ADC device.
For dynamic performance, an FFT test can be done by applying
a very low distortion ac source.
For low frequency testing, the audio precision source can be
used directly because its outputs are isolated. Set the outputs for
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EVAL-AD7903SDZ User Guide
MODES OF OPERATION
SDP CONTROLLED MODE
STANDALONE MODE
The EVAL-AD7903SDZ can also be used without the EVAL-SDP-
CB1Z controller board. In this case, the EVAL-AD7903SDZ is
connected to the serial interface using the J5 connector or the
test points. For more information about the operation of the
serial interface, refer to the AD7903 data sheet.
The AD7903 uses a high speed serial interface that allows sampling
rates of up to 1 MSPS. For more information about the operation of
the serial interface, refer to the AD7903 data sheet.
The AD7903 uses the serial interface to transfer data to the
EVAL-SDP-CB1Z.
The EVAL -AD7903SDZ communicates with the EVAL -SDP-CB1Z
board using level shifters. The EVAL-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.
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EVAL-AD7903SDZ User Guide
HOW TO USE THE SOFTWARE
SETTING UP THE SYSTEM FOR DATA CAPTURE:
BOARD OPERATION/CONNECTION SEQUENCE
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3. After finding the evaluation board, the software connects
to the board and displays the dialog box shown in Figure 18.
With the evaluation software installed, the following board
operation/connection sequence can be used:
1. Connect the SDP controller board to the evaluation board
with the J5 connector (screw into place as required). The
software is configured to find the evaluation board on either
the J4 or J5 connector of the SDP board.
2. Power the board with the appropriate supply, as described
Figure 18. Software Connects to SDP Board
in the Power Supplies section.
4. After the board is correctly detected, the main window of
the software appears (see Figure 21), showing that the
EVAL-AD7903SDZ board is connected.
3. Connect the EVAL-SDP-CB1Z board to a PC using the
USB cable.
4. Start the evaluation software. Click Start >All Programs >
AD7903_03_Evaluation > AD7903_03_Evaluation_
Software.
Without Hardware Connected
The software can run in standalone mode when no evaluation
board hardware is connected to the USB port.
5. Apply a signal source and capture data.
STARTING THE SOFTWARE
1. Click Start > All Programs > AD7903_03_Evaluation >
AD7903_03_Evaluation_Software.
When the software starts running, it searches for hardware
connected to the PC. The software automatically detects the
generic attached to the PC, or you can choose to run the software
in standalone mode without any hardware connected.
2. The software automatically seeks to find the hardware
connected; therefore, when no hardware is connected, a
connectivity error is displayed (see Figure 19). If you wish to
continue without hardware in standalone mode, click Cancel.
With Hardware Connected
To run the program with hardware connected,
1. Click Start > All Programs > AD7903_03_Evaluation >
AD7903_03_Evaluation_Software. (To uninstall the
program, click Start > Control Panel > Add or Remove
Programs > AD7903_03_Evaluation.)
2. If the SDP board is not connected to the USB port when
the software is launched, a connectivity error displays (see
Figure 17). If a connectivity error is displayed, connect the
evaluation board to the USB port of the PC, wait a few
seconds, click Rescan, and follow the instructions.
Figure 19. No Hardware Connected Pop-Up Window Error
3. The software alerts the user that no hardware is connected
and that the software is going to continue in standalone mode.
Figure 17. SDP Board Not Connected to the USB Port Pop-Up Window Error
Figure 20. Software Indicates Operating in Standalone Mode
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4. You can then load example files or previously saved files and
analyze data. The main window of the software appears (see
Figure 21), showing the evaluation board connected as the
part number from the saved data file.
5. If you decide to connect hardware at this point, you must
close the software and relaunch it to allow it to search for
the board again.
Figure 21. Main Window
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sample frequency must be an integer divider of the SCLK
OVERVIEW OF THE MAIN WINDOW
frequency. 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 connected to the board. 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.
The main window of the software is shown in Figure 21 and has
the features described in this section.
File Menu
The File menu offers the choice to
•
•
Load data: load previously captured data.
Save Data as .tsv: save captured data in .tsv format for
future analysis.
Select Channels Checkboxes
•
•
•
Save Picture: save the current screen capture.
Print: print the main window to the default printer.
Exit: close the application.
Select either Channel 1 or Channel 2 or both to read the data
from a single ADC or both ADCs simultaneously.
Tabs Area
Eval Board Connected Box
There are five tabs available in the tabs area of the main window:
Configure, Waveform, 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 22) within the graphs displayed.
The Eval Board Connected box displays the evaluation board
connected to the USB port—either EVAL-AD7902SDZ or
EVAL-AD7903SDZ.
When an evaluation board is not connected to the USB port, the
software can be operated in standalone mode for data analysis,
and the part information notes the part number from the saved
data file.
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.
ADC Settings Area
The ADC Settings section allows changing the sampling
frequency and the reference voltage value, as well as selecting
Channel 1 or Channel 2.
Single Capture Button
Clicking Single Capture performs a single capture from the ADC.
Continuous Capture Button
Reference Voltage (V) Box
Clicking Continuous Capture performs a continuous capture
from the ADC.
By default, the external reference voltage is 5 V (ADR435 on-board
reference). The minimum/maximum voltage calculations are based
on this reference voltage. If you change the reference voltage, you
must change this input accordingly.
Num Samples Box
The Num Samples box allows you to select the number of
Sampling Freq (Hz) Box
samples to analyze.
The default sampling frequency (10000000 Hz) in the Sampling
Freq (Hz) box matches the maximum sample rate of the ADC
connected to the board. Although you can adjust the sampling
frequency, there are limitations in terms of the sample frequencies
that can be entered related to the SCLK frequency applied. The
Exit Button
Clicking the Exit button (in the upper right corner of the
window) closes the software. Alternatively, you can select Exit
from the File menu.
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The Waveform Analysis area (located toward the bottom of the
window) reports the amplitudes recorded from the captured signal
and the frequency of the signal tone. Select the Channel 1 tab
or Channel 2 tab in the Waveform Analysis area to view the
corresponding waveform.
GENERATING A WAVEFORM ANALYSIS REPORT
Figure 22 illustrates the Waveform tab for a 10 kHz sine wave
input signal when the on-board 5 V external reference is used.
CONTROL CONTROL CONTROL
CURSOR ZOOMING PANNING
Figure 22. Waveform Tab
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DC Input
GENERATING A HISTOGRAM OF THE ADC CODE
DISTRIBUTION
A histogram test of dc input can be performed with or without
an external source because the evaluation board has a buffered
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 DC Offset/Mean and Transition Noise, respectively,
in the Histogram Analysis area (located toward the bottom of
the window).
V
REF/2 source at the ADC input.
To perform a histogram test of dc input,
1. If an external source is being used, apply a differential
sinusoidal signal with low distortion (better than 100 dB)
to the evaluation board at the J6/J7 or J10/J15 input SMA
connector pair. 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 Single Capture or Continuous Capture.
Figure 23 shows the histogram with ac input for a 1 kHz sine
wave applied to the ADC input and the resulting calculations.
AC Input
To perform a histogram test of ac input,
Raw data is then captured and passed to the PC for statistical
computations, and various measured values are displayed in the
Histogram Analysis area.
1. Apply a differential sinusoidal signal with low distortion
(better than 100 dB) to the evaluation board at the J6/J7 or
J10/J15 input SMA connector pair.
2. Click the Histogram tab from the main window.
3. Click Single Capture or Continuous Capture.
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 23. Histogram Tab
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2. Click the FFT tab from the main window.
3. Click Sample.
GENERATING A FAST FOURIER TRANSFORM
OF AC CHARACTERISTICS
Figure 24 shows the FFT tab. This feature 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 then captured and passed
to the PC, which performs the FFT and displays the resulting
SNR, SINAD, THD, and SFDR.
To perform an ac FFT test,
The FFT Analysis area displays the results of the captured data.
1. Apply a differential sinusoidal signal with low distortion
(better than 100 dB) to the evaluation board at the J6/J7 or
J10/J15 input SMA connector pair. To attain the requisite
low distortion, which is necessary to allow true evaluation
of the part, one option is to
•
The area labeled 1 in Figure 24 shows the spectrum
information.
The area labeled 2 in Figure 24 displays the fundamental
frequency and amplitude. You can also click Show
Harmonic Content to view information about the second
to fifth harmonics.
The area labeled 3 in Figure 24 displays the performance
data, including the SNR, dynamic range, THD, SINAD,
and noise performance.
•
a. Filter the input signal from the ac source. A band-pass
filter can be used; its center frequency must match the
test frequency of interest.
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.
•
1
2
3
Figure 24. FFT Tab
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GENERATING A SUMMARY OF THE WAVEFORM,
HISTOGRAM, AND FAST FOURIER TRANSFORM
Figure 25 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 25. Summary Tab
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EVALUATION BOARD SCHEMATICS AND ARTWORK
EVAL-AD7903SDZ SCHEMATICS
Figure 26. Schematic, Page 1
Figure 27. Schematic, Page 2
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Figure 28. Schematic, Page 3
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Figure 29. Schematic, Page 4
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0 3 0 1 1 8
Figure 30. Schematic, Page 5
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Figure 31. Schematic, Page 6
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EVAL-AD7903SDZ LAYOUT
Layout Considerations
capacitors, typically 10 µF and 100 nF, placed close to the
DUT (U1) and connected using short, wide traces to provide
low impedance paths and to reduce the effect of glitches on
the power supply lines.
Separate analog and digital sections and keep power supply
circuitry away from the AD7903.
Avoid running digital lines under the device and crossover
of digital and analog signals because these couple noise into
the AD7903.
When laying out the printed circuit board (PCB) for the AD7903,
follow the recommended guidelines described in this section to
obtain the maximum performance from the converter. Figure 33
through Figure 36 show the recommended layout for the AD7903
evaluation board.
•
•
•
Decouple all the power supply pins (VDD1, VDD2, and
VIO) and the REF pin with low ESR and low ESL ceramic
Figure 32. EVAL-AD7903SDZ Evaluation Board Silkscreen—Top Assembly
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Figure 33. EVAL-AD7903SDZ Evaluation Board—Top Layer
Figure 34. EVAL-AD7903SDZ Evaluation Board Layer 2—Ground
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Figure 35. EVAL-AD7903SDZ Evaluation Board Layer 3—Power
Figure 36. EVAL-AD7903SDZ Evaluation Board Bottom Layer
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EVAL-AD7903SDZ User Guide
BILL OF MATERIALS
Table 4. EVAL-AD7903SDZ Bill of Materials
Reference Designator Part Description
Manufacturer Part Number
Stock Code
U1
Dual differential 16-bit, 1 MSPS PulSAR® ADC
Analog Devices AD7903
AD7903
U2
1.2 A, 20 V, 1.4 MHz nonsynchronous step-
down switching regulator
1.2 A, 20 V, 1.4 MHz nonsynchronous step-
down switching regulator
Linear regulator, 3.3 V, 20 V, 500 mA,
ultralow noise, CMOS
2.7 V, 800 µA, 80 MHz rail-to-rail I/O single
amplifier SOT23-5
Analog Devices ADP2301AUJZ
ADP2301AUJZ-R7
ADP2301AUJZ-R7
ADP7104ARDZ-3.3-R7
AD8031ARTZ-R2
U3
U4
U5
Analog Devices ADP2301AUJZ
Analog Devices ADP7104ARDZ-3.3
Analog Devices AD8031ARTZ
U6
U7
Ultralow noise XFET voltage references
Analog Devices ADR435BRZ
ADR435BRZ
Linear regulator, 2.5 V, 20 V, 500 mA, ultralow
noise, CMOS
Analog Devices ADP7104ARDZ-2.5
ADP7104ARDZ-2.5-R7
U8
Single INV
Fairchild
Fairchild
Fairchild
Fairchild
NC7SZ04M5
NC7SZ085M5
NC7SZ085M5
NC7SZ085M5
Farnell 1013809
Farnell 1013807
Farnell 1013807
Farnell 1013807
ADA4841-1YRZ-R7
U9
Single AND gate
Single AND gate
Single AND gate
U10
U11
U12
Low noise, high speed amplifier for 16-bit
systems
Analog Devices ADA4841-1YRZ
U13
U14
20 V, 500 mA, low noise, CMOS adjustable LDO Analog Devices ADP7104ARDZ
ADP7104ARDZ-R7
ADA4841-1YRZ-R7
Low noise, high speed amplifier for 16-bit
systems
32k I2C serial EEPROM, 8-lead MSOP
Analog Devices ADA4841-1YRZ
U15
U16
Microchip 24LC32A-I/MS
Farnell 1331330
Low noise, high speed amplifier for 16-bit
systems
Low noise, high speed amplifier for 16-bit
systems
Analog Devices ADA4841-1YRZ
Analog Devices ADA4841-1YRZ
ADA4841-1YRZ-R7
U17
ADA4841-1YRZ-R7
Farnell 197427
C1, C2, C5, C9, C11,
C13, C19
Capacitor tantalum, 20 V
AVX
TAJB106K020RNJ
C3, C4, C6, C7
Capacitor ceramic, 4.7 µF, 16 V, X7R, 0805
Taiyo Yuden
Murata
EMK212B7475KG-T
Farnell 1853520
C8, C20, C23, C25, C27, Capacitor ceramic, 50 V, X7R
C28, C30, C31, C34,
GRM188R71H104KA93D Farnell 8820023
C37, C41, C42, C44,
C45, C48, C53, C54,
C56, C57, C59, C65,
C67, C77, C78, C80
C9
Capacitor ceramic, 50 V, X7R, 0805
Capacitor ceramic, 22 µF, 10 V, X7R, 1206
Capacitor ceramic, 4.7 µF, 16 V, X5R, 1206
Capacitor, 0805, 1 µF, 50 V, X7R
Murata
AVX
C0805C104K5RACTU
LMK316AB7226ML-TR
EMK316BJ475KL-T
Farnell 1414664
Farnell 1894515
Farnell 6578937
C12, C40, C79
C14
Taiyo Yuden
Murata
C15, C16, C17, C21,
C22, C26
GRM21BR71H105KA12L Farnell 1735541
C18
Capacitor ceramic, 50 V, X7R
Murata
AVX
GRM188R71H103KA01D Farnell 1118178
C33, C50, C58, C66
C35, C52, C74, C75
Capacitor ceramic ,10 pF, 100 V, C0G, 0603
06031A100JAT2A
C1608C0G1H272J
Farnell 1273324
Farnell 1844178
Capacitor ceramic, 2700 pF, 50 V, C0G/NP0,
0603
TDK
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Reference Designator Part Description
Manufacturer Part Number
Stock Code
C24, C29, C32, C36,
C38, C39, C43, C46,
C47, C49, C55, C60,
C61, C62, C63, C68,
C69, C70, C71, C72,
C73, C76, C81
Capacitor ceramic, 50 V, C0G/NP0, 0603
TDK
C1608C0G1H272J
Do not place
R1
R2
R3
Resistor, thick film, 2.4 kΩ, 0603, 100 mW, 1%
SMD resistor
Yageo
RC0603FR-072K4L
Farnell 1799329
Farnell 9333436
Farnell 1170942
Multicomp
Multicomp
MC 0.1W 0805 1% 62K
Resistor, 0603, 35.7 kΩ
MC 0.063W 0603 1%
35K7
R4
R5
R6
SMD resistor
Multicomp
Multicomp
Multicomp
MC 0.0625W 0402 1%
53K6
MC 0.0625W 0402 1%
10K2
MC 0.063W 0603 1%
16K9
Farnell 1803723
Farnell 1803137
Farnell 1170908
SMD resistor
Resistor, 0603, 16.9 kΩ
R7
Resistor, 0805, 12.1 kΩ, 1%
Vishay Draloric CRCW080512K1FKEA
Farnell 1469866
Farnell 9331573
R10
Resistor, 0603, 82 kΩ, 0.063 W, 1%
Multicomp
Multicomp
Multicomp
MC 0.063W 0603 1%
82K
MC 0.063W 0603 1%
100K
R11, R13, R42, R44
SMD resistor
SMD resistor
Farnell 9330402
Farnell 9331662
R12, R14, R20, R21,
R23, R25, R26, R36,
R38, R40, R45, R48,
R53, R56, R63, R64,
R69, R70, R71, R72
MC 0.063W 0603 0R
R17, R22, R32, R37,
R46, R47, R54, R55
R27, R28, R34, R35,
R49, R50, R73, R74
Resistor, 0805, 49.9 Ω, 0.1%, 0.125 W
Resistor, 0805, 49.9 kΩ, 1%, 0.125 W
Panasonic
Panasonic
ERA6AEB49R9V
ERJ-6ENF4992V
Farnell 1810805
Digi-Key
P49.9KCCT-ND
R24, R41, R67, R68
Resistor, 22 Ω, 1% 0805
Not applicable
Vishay Draloric CRCW080522ROFKEAHP Farnell 1738936
R8, R9, R15, R16, R18,
R19, R29, R30, R31, R33,
R39, R44, R59, R60,
R61, R62, R65, R66
Not applicable Not applicable Do not place
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RELATED LINKS
Resource
AD7903
Description
Product Page: Dual Differential 16-Bit, 1 MSPS PulSAR ADC
ADA4841-1
AD8031
Product Page: Unity Gain Stable, Low Noise and Distortion, Rail-to-Rail Output Amplifier
Product Page: 2.7 V, 800 μA, 80 MHz Rail-to-Rail I/O Amplifiers
ADP7104
ADP2301
ADR435
Product Page : 20 V, 300 mA/500 mA, Low Noise, CMOS LDO
Product Page: 1.2 A, 20 V, 1.4 MHz, Nonsynchronous Step-Down Regulator
Product Page: Ultralow Noise, High Accuracy Voltage References
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NOTES
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NOTES
EVAL-AD7903SDZ User Guide
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.
UG11800-0-1/14(0)
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