Analog Devices EVAL-AD7903SDZ User manual

EVAL-AD7903SDZ User Guide
UG-609
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 32
FEATURES
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
EVALUATION KIT CONTENTS
EVAL-AD7903SDZ evaluation board
Wall power supply 9 V dc adapter
Daughter card power connector
ADDITIONAL EQUIPMENT/SOFTWARE NEEDED
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)
ONLINE RESOURCES
Documents Needed
AD7903 data sheet
EVAL-AD7903SDZ user guide
Required Software
EVAL-AD7903SDZ evaluation software
FAQs and Troubleshooting
TYPICAL SETUP
Figure 1. Typical Setup for the EVAL-AD7903SDZ
(EVAL-AD7903SDZ on Left and EVAL-SDP-CB1Z on Right)
SIGNALSOURCE
SMA
CONNECTOR
PC
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TABLE OF CONTENTS
Features .............................................................................................. 1
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
Modes of Operation ....................................................................... 12
SDP Controlled Mode ............................................................... 12
Standalone Mode........................................................................ 12
How to Use the Software ............................................................... 13
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 E VA L -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.
The evaluation board is ideal for use with the Analog Devices, Inc.,
system demonstration platform (SDP) board, E VA L -SDP-CB1Z.
The evaluation board interfaces to the SDP board via a 120-pin
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, EVA L -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

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GETTING STARTED
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
•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 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.
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 2. AD7903 Evaluation Board Software Installation: Installation Begins
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.)
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 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
continue.
Figure 5. AD7903 Evaluation Board Software Installation:
Reviewing a Summary of the Installation
7. A dialog box shows the installation progress.
Figure 6. AD7903 Evaluation Board Software Installation:
Displaying Installation Progress
8. The dialog box informs you when the installation is
complete. Click Next.
Figure 7. AD7903 Evaluation Board Software Installation:
Indicating When the Installation Is Complete
9. The setup for the installation of the E VA L-SDP-CB1Z
system demonstration platform board drivers auto-
matically begins to load.
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 E VA L -
SDP-CB1Z system demonstration platform board drivers.
1. Make sure that all other applications are closed, and then
click Next.
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.
Figure 10. EVAL-SDP-CB1Z Drivers Setup:
Selecting the Location for Drivers Installation
3. Installation of the SDP drivers begins.
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
5. To complete the drivers installation, click Finish, which
closes the installation wizard.
Figure 13. EVAL-SDP-CB1Z Drivers Setup:
Completing the Drivers Setup Wizard
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
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EVALUATION BOARD SETUP PROCEDURES
The AD7903 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 1 shows a photograph of the connections made between
the E VA L -AD7903SDZ daughter board and the E VA L -SDP-CB1Z
motherboard.
Connecting the Evaluation and SDP Boards to a PC
1. Install the AD7903 software. Ensure that the E VA L -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.
2. Before connecting power, connect the 120-pin connector, J5,
of the E VA L -AD7903SDZ board to Connector J4 on the
E VA L-SDP-CB1Z board. Nylon screws are included in the
E VA L-AD7903SDZ evaluation kit and can be used to
ensure that the E VA L -AD7903SDZ and E VA L -SDP-CB1Z
boards are connected firmly together.
3. Connect the 9 V power supply adapter included in the kit
to the E VA L -SDP-CB1Z.
4. Connect the E VA L -SDP-CB1Z board to the PC via the
USB cable. (If you are using Windows® XP, you may need to
search for the E VA L -SDP-CB1Z drivers. Choose to auto-
matically search for the drivers for the E VA L -SDP-CB1Z
board if prompted by the operating system.)
Verifying the Board Connection
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 EVA 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 To ols, click Device Manager.
b. Under ADI Development Tools, Analog Devices
System Development Platform SDP-B should appear
(see Figure 15), indicating that the E VA L -SDP-CB1Z
driver software is installed and that the board is
connected to the PC correctly.
Figure 15. Device Manager:
Checking that the Board Is Connected to the PC Correctly
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EVALUATION BOARD HARDWARE
DEVICE DESCRIPTION
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 E VA L -SDP-CB1Z are available on the Analog
Devices website, at www.analog.com.
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.
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 ADP2301
+7.5 Positive rail ADP7104
−2.5 Negative rail ADP2301
+2.5 ADC VDD rail ADP7104
+3.3 VDRIVE (digital power) ADP7104
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.
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 Setting Function
SL1
B
+V
S
SL2 B −VS
SL3 B −VS
SL4 B +VS
LK3 B V_SDP
LK4 B VREF
LK5 B VDD for ADC
1All other solder link settings are as described in Table 3.

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Figure 16. Simplified Evaluation Board Functional Block Diagram
SDP BOARD
11800-016
AD7902/AD7903 PulSAR EVALUATION BOARD
VIN1+
VIN1–
IN1+
IN1–
ADC1
+V
S
–V
S
GND
+5V
ADSP-BF527
DSP
SPORT
SCK1
SDO1
CNV1
VIO1
SDI1
REF1
+7.5V
VDD1
ADA4841-1
ADA4841-1
A B
–2.5V
–2.5V
+7.5V GND
VCM
AD8031
POWER SUPPLY CIRCUITRY
ADP7104, ADP2301
V
IN
= 9V
WALL ADAPTER
VDD
VSDP
GND
(OPTIONAL)
(OPTIONAL)
+7.5V/–2.5V 2.5V +7.5V 3.3V +5V
ADR435
GLUE
LOGIC
IN2+
IN2–
ADC2 SCK2
SDO2
CNV2
VIO2
SDI2
REF2
+7.5V VDD2
ADA4841-1
ADA4841-1
A B
–2.5V
–2.5V
+7.5V
GND
GLUE
LOGIC
2.5V
VIN2–
VIN2+
5V
5V

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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 Setting Function Comment
SL1 A +VSChange to B if using bench supplies.
SL2 A −VSChange to B if using bench supplies.
SL3 A −VSChange to B if using bench supplies.
SL4 A +VSChange to B if using bench supplies.
SL5 A Analog input Do not alter.
SL6 A Analog input Do not alter.
LK3 A V_SDP Change to B if using bench supplies.
LK4 A VREF Change to B if using bench supplies.
LK5
A
V
DD
for ADC
Change to B if using bench supplies.
LK6 A U12 output connects to
U14 input
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 A ADC2 input Change to B if using ADC1 input.
LK9 A ADC2 input Change to B if using ADC1 input.
LK10 A U17 input Change to B if U17 needs to be bypassed.
LK11 A U17 input Change to B if U17 needs to be bypassed.
LK12 A U16 input Change to B if U16 needs to be bypassed.