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AD7091R User Guide UG-409
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
Evaluation Board for the AD7091R Analog-to-Digital Converter
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 20
FEATURES Full-featured evaluation board for the AD7091R On-board power supplies Standalone capability PC control in conjunction with system demonstration
platform (EVAL-SDP-CB1Z) PC software for control and data analysis
EVAL-AD7091RSDZ CONTENTS Evaluation board hardware Evaluation software CD for the AD7091R Mains power supply adapter
ADDITIONAL EQUIPMENT NEEDED System demonstration platform (EVAL-SDP-CB1Z) when
using evaluation software Signal source
EVALUATION BOARD DESCRIPTION The EVAL-AD7091RSDZ is a full-featured evaluation board designed to allow the user to easily evaluate all features of the AD7091R analog-to-digital converter. The evaluation board can be controlled via the SDP connector (J4). The SDP board allows the evaluation board to be controlled through the USB port of a PC using the EVAL-AD7091RSDZ software.
On-board components include: the AD8031 high speed precision rail-to-rail op amp, the AD8032 high speed precision rail-to-rail dual op amp, and the ADP3303 high accuracy 200 mA low dropout linear regulator.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. EVAL-AD7091RSDZ Block Diagram
DCJACKON-BOARD
POWER SUPPLY
AD7091R
SDP BOARD
CS
CONVST
SDO
SCLK
VDRIVE
ADSP-BF527DSP
VDD
DGND VDRIVE
VDD
AG
ND
LK5A BVDRIVE 3.3V LK6 A
B
VIN
VINBVIN
BIAS UP
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TABLE OF CONTENTS Features .............................................................................................. 1
EVAL-AD7091RSDZ Contents ........................................................ 1
Additional Equipment Needed ....................................................... 1
Evaluation Board Description ......................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
EVAL-AD7091RSDZ Quick Start Guide ........................................ 3
Evaluation Board Hardware ............................................................ 4
Device Description ....................................................................... 4
Hardware Link Options ............................................................... 4
Power Supplies .............................................................................. 4
Sockets/Connectors ...................................................................... 5
Test Points ...................................................................................... 5
EVAL-AD7091RSDZ Basic Hardware Setup ............................. 6
Evaluation Board Software ...............................................................7
Software Installation .....................................................................7
Launching the Software ................................................................8
Description of Main Software Window .....................................9
Waveform Capture ..................................................................... 10
AC Testing—Histogram ............................................................ 11
DC Testing—Histogram ............................................................ 11
AC Testing—FFT Capture ........................................................ 12
Summary Tab .............................................................................. 13
Save File ....................................................................................... 13
Open File ..................................................................................... 13
Evaluation Board Schematics and Artwork ................................ 14
Ordering Information .................................................................... 18
REVISION HISTORY 8/12—Revision 0: Initial Version
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EVAL-AD7091RSDZ QUICK START GUIDE Follow these steps to quickly evaluate the AD7091R:
1. Install the EVAL-AD7091RSDZ software from the enclosed CD. Ensure that the EVAL-SDP-CB1Z board is discon-nected from the USB port of the PC while installing the software. The PC may need to be restarted after the installation.
2. Ensure that the default link options are configured as outlined in Table 2.
3. Connect the EVAL-SDP-CB1Z board to the EVAL-AD7091RSDZ board as shown in Figure 2.
4. Screw the two boards together with the enclosed nylon screw/nut set to ensure that the boards connect firmly together.
5. Connect the power supply adapter included in the kit to Connecter J1 on the EVAL-AD7091RSDZ board.
6. Connect the EVAL-SDP-CB1Z board to the PC via the USB cable. For 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.
7. Launch the AD7091R software from the Analog Devices subfolder in the Programs menu.
8. Connect a bipolar input signal via the VINB connector, J6. 9. Remove LK4.
Figure 2. Hardware Configuration—Setting Up the EVAL-AD7091RSDZ
POWER SUPPLIES
SDP BOARD
USBINTERFACE
9VDC INPUT
INPUTSIGNALAD7091R
BUFFERSTAGE
BIAS UP
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EVALUATION BOARD HARDWARE DEVICE DESCRIPTION This user guide describes the evaluation board for the AD7091R analog-to-digital converter.
The AD7091R is a 12-bit, ultralow power, successive approxima-tion ADC. The AD7091R operates from a single 2.7 V to 5.25 V power supply and is capable of achieving a throughput rate of 1 MSPS. The AD7091R also features an on-chip conversion clock, an accurate reference, and a high speed serial interface.
The conversion process and data acquisition are controlled using a CONVST signal and an internal oscillator. The AD7091R has a serial interface allowing data to be read after the conver-sion, while achieving 1 MSPS throughput rate. The AD7091R uses advanced design and process techniques to achieve ultralow power dissipation at high throughput rates. An on-chip, accurate 2.5 V reference is available.
Complete specifications for the AD7091R are provided in the AD7091R data sheet, available from Analog Devices, which should be consulted in conjunction with this user guide when using the evaluation board.
Full details on the EVAL-SDP-CB1Z are available at http://www.analog.com/EVAL-SDP-CB1Z.
HARDWARE LINK OPTIONS The functions of the link options are described in Table 2. The default setup is configured to operate the board with the mains power supply adapter and to interface to the EVAL-SDP-CB1Z board.
POWER SUPPLIES Care should be taken before applying power and signals to the evaluation board to ensure that all link positions are set according to the required operating mode. See Table 2 for the complete list of link options.
This evaluation board is supplied with a wall-mountable switching power supply that provides a 9 V dc output. Connect the supply to a 100 V to 240 V ac wall outlet at 50 Hz to 60 Hz.
The output from the supply is provided through a 2.0 mm inner diameter jack that connects to the evaluation board at J1. The 9 V supply is connected to the on-board 5 V linear regulator that supplies the correct bias to each of the various sections on the board and the EVAL-SDP-CB1Z board.
When using this evaluation board with the EVAL-SDP-CB1Z board, it is necessary to power the board through the J1 connector.
If the evaluation board is used without the 9 V adapter, an external power supply in the range of 2.7 V to 5.25 V must be connected to the VDD input to supply the AD7091R VDD pin. In addition, an external supply in the range of 1.65 V to 5.25 V must be connected to the VDRIVE input to supply the AD7091R VDRIVE pin.
Each supply is decoupled on this board using 10 µF tantalum and 100 nF multilayer ceramic capacitors.
There are two main ground planes, AGND and DGND. These are connected at one location close to the AD7091R.
Caution
When the EVAL-AD7091RSDZ evaluation board is connected to the EVAL-SDP-CB1Z, care must be taken to ensure that, if an external voltage is supplied to the VDRIVE input connector, J3, the voltage does not exceed 3.3 V. Otherwise, permanent damage may occur to the EVAL-SDP-CB1Z board.
Table 1. External Power Supplies Required Power Supply Voltage Range Purpose DC Jack 9 V ± 5% Supplies power to on-board
power management devices VDD 2.7 V to 5.25 V Analog supply rail VDRIVE 1.65 V to 5.25 V Digital supply rail without EVAL-
SDP-CB1Z connected 3.3 V ± 5% Digital supply rail with EVAL-
SDP-CB1Z connected
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Table 2. Link Options
Category Link Default Position Function
Buffer Settings
LK1 A This link is used to select the analog signal path. In Position A, the analog signal is buffered via U2, a unity gain buffer. In Position B, the analog signal is buffered via U3, a unity gain buffer. In Position C, the analog signal bypasses U2 and U3.
LK2 A This link is used to select the source of the analog input signal to the AD7091R. In Position A, the analog signal is sourced via the U2 op amp. In Position B, the analog signal is sourced via the U3 op amp. In Position C, the analog signal bypasses U2 and U3.
LK3 Fitted This resistor link option is used to select a biased signal as the analog input signal. Fitted—bias up circuit connected to the signal path. Not fitted—bias up circuit disconnected from the signal path.
Termination LK4 Inserted Adds a 51 Ω termination resistor to AGND at VIN. Inserted—51 Ω termination on the VIN input. Not inserted—no 51 Ω termination on the VIN input.
Power Supplies
LK5 A This link is used to select the source of the VDRIVE supply for the AD7091R. In Position A, the VDRIVE supply is sourced externally via the J3 connector. In Position B, the VDRIVE supply is sourced from the EVAL-SDP-CB1Z via the J4 connector.
LK6 A This link is used to select the source of the VDD supply for the AD7091R and on-board buffers. In Position A, the VDD supply is sourced internally from the on-board power supplies. In Position B, the VDD supply is sourced externally via the J2 connector.
SOCKETS/CONNECTORS The connectors and sockets on the EVAL-AD7091RSDZ are as outlined in Table 3.
Table 3. On-Board Connectors Connector Function J1 9 V, 2.0 mm dc jack connector J2 External VDD and AGND power connector J3 External VDRIVE and DGND power connector J4 120-way connector for EVAL-SDP-CB1Z interface J5 VIN analog input signal J6 VINB analog input signal to bias up circuit J7 External reference voltage connector
The default interface to this evaluation board is via the 120-way connector, which connects the EVAL-AD7091RSDZ to the EVAL-SDP-CB1Z board.
TEST POINTS There are numerous test points on the EVAL-AD7091RSDZ board. These test points enable the user to have easy access to the signals from the evaluation board for probing, evaluation, and debugging.
It is also possible to access the AD7091R via the test points to operate the EVAL-AD7091RSDZ in standalone mode without the need for the EVAL-SDP-CB1Z board.
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EVAL-AD7091RSDZ BASIC HARDWARE SETUP The EVAL-AD7091RSDZ board connects to the EVAL-SDP-CB1Z system demonstration platform board. The EVAL-SDP-CB1Z board is the controller board, which is the communication link between the PC and the main evaluation board. Figure 2 shows a photograph of the connections between the EVAL-AD7091RSDZ daughter board and the EVAL-SDP-CB1Z board.
The analog input range to the AD7091R is 0 V to VREF and should not be exceeded. When using the on-chip reference, VREF is 2.5 V. An input signal in the range of 2.5 V p-p should be connected to the EVAL-AD7091RSDZ board via VIN or VINB.
A bipolar input signal should be connected to VINB, the J6 connector. This signal is biased to 1.25 V via the bias up circuitry on the EVAL-AD7091RSDZ. The signal source should be a low impedance source. An on-board unity gain amplifier buffers the signal to the AD7091R. This is the default configura-tion on the EVAL-AD7091RSDZ.
A unipolar input signal should be connected to VIN, the J5 connector. An on-board unity gain amplifier buffers the signal to the AD7091R.
Before connecting power, connect the EVAL-AD7091RSDZ board to Connector A on the EVAL-SDP-CB1Z board. A nylon screw/nut set is included in the EVAL-AD7091RSDZ kit and can
be used to ensure that the EVAL-AD7091RSDZ and EVAL-SDP-CB1Z boards are connected firmly together.
Ensure that the link options are in the default positions as outlined in Table 2.
After the EVAL-AD7091RSDZ board and the EVAL-SDP-CB1Z board are connected securely, connect the power to the EVAL-AD7091RSDZ board. The EVAL-AD7091RSDZ board requires an external power supply adapter, which is included in the evaluation board kit. Connect this power supply to Connector J1 on the EVAL-AD7091RSDZ board. For further details on the required power supply connections and options, see the Power Supplies section.
Before connecting the EVAL-SDP-CB1Z board to your PC, ensure that the EVAL-AD7091RSDZ software has been installed from the enclosed CD. The full software installation procedure is detailed in the Evaluation Board Software section.
Finally, connect the EVAL-SDP-CB1Z board to the PC via the USB cable enclosed in the EVAL-SDP-CB1Z kit. If using a Windows XP platform, 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.
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EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION The EVAL-AD7091RSDZ kit includes software on a CD. Double-click the setup.exe file from the CD to run the install. The default location for the software is
C:\Program Files\Analog Devices\AD7091R\
Install the evaluation software before connecting the evaluation board and the EVAL-SDP-CB1Z board to the USB port of the PC to ensure that the evaluation system is correctly recognized when connected to the PC.
There are two parts to the installation:
• EVAL-AD7091RSDZ board software installation • EVAL-SDP-CB1Z system demonstration platform board
drivers installation
Follow Step 1 to Step 4 (see Figure 3 to Figure 6) to install the EVAL-AD7091RSDZ software. Follow Step 5 to Step 8 (see Figure 7 to Figure 10) to install the EVAL-SDP-CB1Z drivers. Proceed through all of the installation steps, allowing the software and drivers to be placed in the appropriate locations. Connect the EVAL-SDP-CB1Z board to the PC only after the software and drivers have been installed.
Figure 3. EVAL-AD7091RSDZ Installation—User Account Control
1. Click Yes to begin the installation process.
Figure 4. EVAL-AD7091RSDZ Installation—Destination Directory
2. Select the installation directory. Click Next.
Figure 5. EVAL-AD7091RSDZ Installation—Start Installation
3. Click Next to install the software.
Figure 6. EVAL-AD7091RSDZ Installation—Installation Complete
4. The installation of the evaluation software completes. Click Next to proceed with the installation of the drivers.
Figure 7. EVAL-SDP-CB1Z Drivers Installation—Setup Wizard
5. The setup wizard opens. Click Next to begin the driver installation process.
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Figure 8. EVAL-SDP-CB1Z Drivers Installation—Choose Install Location
6. Select a destination folder for the SDP drivers, and click Install.
Figure 9. EVAL-SDP-CB1Z Drivers Installation—Windows Security
7. Click Install to proceed with the installation.
Figure 10. EVAL-SDP-CB1Z Drivers Installation—Complete
8. Click Finish.
After installation from the CD is complete, connect the EVAL-AD7091RSDZ board to the EVAL-SDP-CB1Z board as described in the Evaluation Board Hardware section.
When you first plug in the EVAL-SDP-CB1Z board via the USB cable provided, allow the Found Hardware Wizard to run. After the drivers are installed, you can check that the board is connected correctly by looking at the Device Manager of the PC. The Device Manager can be found by right-clicking My Computer > Manage > Device Manager from the list of System Tools, as shown in Figure 11. The EVAL-SDP-CB1Z SDP-B board should appear under ADI Development Tools. This completes the installation.
Figure 11. Device Manager
LAUNCHING THE SOFTWARE After the EVAL-AD7091RSDZ and EVAL-SDP-CB1Z boards are correctly connected to your PC, the EVAL-AD7091RSDZ software can be launched.
To launch the software, perform the following steps:
1. From the Start menu, select Programs >Analog Devices > AD7091R. The main window of the software then opens (see Figure 13).
2. If the EVAL-AD7091RSDZ board is not connected to the USB port via the EVAL-SDP-CB1Z when the software is launched, a connectivity error displays (see Figure 12). Connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions.
Figure 12. Connectivity Error Alert
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Figure 13. Evaluation Software Main Window
DESCRIPTION OF MAIN SOFTWARE WINDOW The following tools allow user control of the different chart displays. When the software is launched, the main software window opens (see Figure 13).
The user software panel as shown in Figure 13 has the following features:
• Menu bar • Control buttons • Data capture display
Menu Bar
The menu bar consists of the File and Help menus.
File Menu
Open (Sample Data). Loads previously captured data in TSV (tab separated values) format for analysis.
Save (Sample Data). Saves captured data in TSV (tab separated values) format for future analysis.
Print Front Panel Picture. Prints the software window displayed.
Save As Picture. Saves the front panel as a JPEG file.
Exit. Exits the program.
Help Menu
Open analog.com. Opens www.analog.com.
Control Buttons
The EVAL-AD7091RSDZ software includes the following control buttons, drop-down boxes, and indicators.
Mode. Selects the operating mode of the AD7091R. In Normal mode, the ADC is ready to acquire samples. In Sleep mode, the device enters power-down mode when the SAMPLE button is clicked.
Sampling rate. Selects the sampling rate of the data acquisition.
# Samples. Selects the number of samples to be completed in a single acquisition.
SAMPLE. Initiates the sampling and readback of the defined number of measurements.
CONTINUOUS. Performs a continuous capture from the ADC. Click a second time to stop sampling.
1. MENU BAR.2. CONTROL BUTTONS.3. DATA CAPTURE DISPLAY.
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FLASH LED. Causes the orange LED1A on the SDP board to flash, which can be a useful debugging tool.
STOP. Stops the program.
Data Capture Display
There are four tabs that display the conversion data in different formats: Waveform, Histogram, FFT, and Summary.
The tools shown in Figure 14 allow user control of the different chart displays.
Figure 14. Chart Tools
WAVEFORM CAPTURE Figure 15 illustrates the waveform capture tab.
The waveform analysis reports the amplitudes recorded from the captured signal in addition to the frequency of the signal tone.
Figure 15. Waveform Capture Tab
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Figure 16. Histogram Capture Tab
AC TESTING—HISTOGRAM Figure 16 shows the histogram capture tab. This tests the ADC for the code distribution for the 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, select the Histogram tab in the evaluation software main window and click the SAMPLE button.
Note that an ac histogram requires a quality signal source applied to the input VIN/VINB connectors.
DC TESTING—HISTOGRAM The histogram is more commonly used for dc testing. Similar to ac testing, this tests the ADC for the code distribution for the dc input and computes the mean and standard deviation, or transi-tion 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, select the Histogram tab in the evalua-tion software main window and click the SAMPLE button.
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Figure 17. FFT Capture Tab
AC TESTING—FFT CAPTURE Figure 17 shows the FFT capture 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. To perform an ac test, apply a sinusoidal signal to the evaluation board at the SMB input, J5 or J6. Low distortion, better than 115 dB, is required to allow true evaluation of the part. One possibility is to filter the input signal from the ac source. There is no sug-gested band-pass filter but consideration should be taken in the
choice. Furthermore, if using a low frequency band-pass filter when the full-scale input range is more than a few volts peak to peak, it is recommended to use the on-board amplifiers to amplify the signal, thus preventing the filter from distorting the input signal.
Figure 17 displays the results of the captured data.
• Section 1 shows the input signal information. • Section 2 displays the fundamental frequency and
amplitude in addition to the 2nd to 5th harmonics. • Section 3 displays the performance data: SNR, dynamic
range, THD, SINAD, and noise performance.
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Figure 18. Summary Tab
SUMMARY TAB Figure 18 shows the summary tab. The summary tab captures all the display information and provides them in one panel with a synopsis of the information, including key performance parameters such as SNR and THD.
SAVE FILE The software can save the current captured data for future analysis.
Go to the File menu, and click Save (Sample Data). The save dialog box opens. Save to an appropriate folder location.
Figure 19. Save File dialog Box
OPEN FILE The software can load captured data for analysis.
Go to the File menu, and click Open (Sample Data). The open file dialog box opens. Load an appropriate file.
Figure 20. Open File Dialog Box
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EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 21. Schematic Page 1
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Figure 22. Schematic Page 2
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Figure 23. Schematic Page 3
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7P
AR
_D
10
10
6P
AR
_D
8
10
5P
AR
_D
6
10
4G
ND
10
3P
AR
_D
4
10
2P
AR
_D
2
10
1P
AR
_D
0
10
0P
AR
_W
R
99
PA
R_
INT
98
GN
D
97
PA
R_
A2
96
PA
R_
A0
95
PA
R_
FS2
94
PA
R_
CLK
93
GN
D
92
SP
OR
T_
RS
CLK
91
SP
OR
T_
DR
0
90
SP
OR
T_
RFS
89
SP
OR
T_
TFS
88
SP
OR
T_
DT
0
87
SP
OR
T_
TS
CLK
86
GN
D
85
SP
I_S
EL_
A
84
SP
I_M
OS
I
83
SP
I_M
ISO
82
SP
I_C
LK
81
GN
D
80
SD
A_
0
79
SC
L_0
78
GP
IO1
77
GP
IO3
76
GP
IO5
75
GN
D
74
GP
IO7
73
TM
R_
B
72
TM
R_
D
71
NC
70
NC
69
GN
D
68
NC
67
NC
66
NC
65
NC
64
NC
63
GN
D
62
UA
RT
_T
X
61
BM
OD
E1
60
RE
SE
T_
IN5
9U
AR
T_
RX
58
GN
D5
7N
C5
6N
C5
5N
C5
4N
C5
3N
C5
2G
ND
51
NC
50
NC
49
TM
R_
C4
8T
MR
_A
47
GP
IO6
46
GN
D4
5G
PIO
44
4G
PIO
24
3G
PIO
04
2S
CL_
14
1S
DA
_1
40
GN
D3
9S
PI_
SE
L1/S
PI_
SS
38
SP
I_S
EL_
C3
7S
PI_
SE
L_B
36
GN
D3
5S
PO
RT
_IN
T3
4S
PO
RT
_D
T3
33
SP
OR
T_
DT
23
2S
PO
RT
_D
T1
31
SP
OR
T_
DR
13
0S
PO
RT
_D
R2
29
SP
OR
T_
DR
32
8G
ND
27
PA
R_
FS1
26
PA
R_
FS3
25
PA
R_
A1
24
PA
R_
A3
23
GN
D2
2P
AR
_C
S2
1P
AR
_R
D2
0P
AR
_D
11
9P
AR
_D
31
8P
AR
_D
51
7G
ND
16
PA
R_
D7
15
PA
R_
D9
14
PA
R_
D1
11
3P
AR
_D
13
12
PA
R_
D1
41
1G
ND
10
PA
R_
D1
79
PA
R_
D1
98
PA
R_
D2
17
PA
R_
D2
36
GN
D5
US
B_
VB
US
4G
ND
3G
ND
2N
C1
VINJ4
1A
02
A1
3A
24
VS
S
8V
CC
7W
P6
SC
L5
SD
A
U5
24
LC3
2
R1
8
DN
IR
19
DN
I
R1
7D
NI
R2
5 DN
I
R2
4
DN
I
R2
6D
NI
R2
71
00
K
R2
81
00
K
R2
0
0r
R2
1
0r
R2
2
0r
R2
3
0r
VIO
_C
ON
NE
CT
O
VIO
_C
ON
NE
CT
OR
SC
LK
CS
SD
O
CO
NV
ST
CO
NV
ST
VS
DP
10702-023
AD7091R User Guide UG-409
Rev. 0 | Page 17 of 20
Figure 24. EVAL-AD7091RSDZ Top-Side Silkscreen
Figure 25. EVAL-AD7091RSDZ Top Layer
Figure 26. EVAL-AD7091RSDZ Bottom Layer
1070
2-02
410
702-
025
1070
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UG-409 AD7091R User Guide
Rev. 0 | Page 18 of 20
ORDERING INFORMATION See Table 4 for a list of the evaluation boards compatible with the hardware described in this user guide.
Table 4. Compatible Boards Model1 Description EVAL-AD7091RSDZ AD7091R evaluation board EVAL-SDP-CB1Z Evaluation controller board ADZS-BRKOUT-EX3 Signal breakout board 1 Z = RoHS-compliant part.
UG-409 AD7091R User Guide
Rev. 0 | Page 20 of 20
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.
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©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG10702-0-8/12(0)