Analog Devices EVAL-CN-304-SDZ User manual

EVAL-CN-304-SDZ Evaluation Board User Guide
UG-266
One Technology Way •P. O . Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD9834 20 mW Power, 2.3 V to 5.5 V, 75 MHz Complete DDS by Using
the EVAL-CN-304-SDZ
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.Rev. B | Page 1 of 12
FEATURES
Full featured evaluation board (EVAL-CN-304-SDZ) for the
AD9834
Graphic user interface software for board control and data
analysis
Connector to the EVAL-SDP-CB1Z System Demonstration
Platform (SDP) board
Various power supply and reference link options
APPLICATIONS
Biomedical sensors
Bioelectrical impedance analysis
Electrochemical analysis
Impedance spectroscopy
Complex impedance measurement
Nondestructive testing
GENERAL DESCRIPTION
The AD9834 is a 75 MHz, low power DDS device capable of
producing high performance sine and triangular outputs. It
also has an on-board comparator that allows a square wave to
be produced for clock generation. Consuming only 20 mW of
power at 3 V makes the AD9834 an ideal candidate for power-
sensitive applications.
The E VA L -CN-304-SDZ board is used in conjunction with a
E VA L-SDP-CB1Z board available from Analog Devices, Inc. The
USB to SPI communication to the AD9834 is completed using
this Blackfin®-based development board.
A high performance, on-board 75 MHz trimmed general oscillator
is available to use as the master clock for the AD9834 system.
Various links and SMB connectors are also available on the
E VA L-CN-304-SDZ board to maximize the usability.
Complete specifications for the AD9834 are provided in the
AD9834 data sheet, available from Analog Devices. Consult the
AD9834 data sheet in conjunction with this user guide when
using the evaluation board.
FUNCTIONAL BLOCK DIAGRAM
SCLK SDATAFSYNC
IOUTB
MCLK
AD9834
FSELECT
PSELECT
RESET
EVAL-SDP-CB1Z
ADP3301
USB
SPORT
GPIO IOUT
MCLK XO
09791-001
Figure 1.

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TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Evaluation Board Software .............................................................. 3
Installing the Software ................................................................. 3
Running the Software ...................................................................4
Operating the Software.................................................................5
Evaluation Board Schematics and Layout......................................8
Ordering Information.................................................................... 11
Bill of Materials........................................................................... 11
REVISION HISTORY
8/15—Rev. A to Rev. B
Changes to Title ............................................................................................ 1
Changed EVAL-AD9834SDZ to EVAL-CN-304-SDZ ...Throughout
Changes to Installing the Software Section................................... 3
Changes to Table 1 and Figure 4..................................................... 4
Deleted Setting up the Digital Interface Section and Figure 5;
Renumbered Sequentially................................................................ 5
Added Operating the Software Section ......................................... 5
Changes to Figure 5 to Figure 8 and Programming Method:
Hardware or Software Section ........................................................ 5
Changes to Waveform Options Section, Power-Down Options
Section, and Figure 9 to Figure 14.................................................. 6
Changes to Example of Operation Section ....................................7
Changes to Figure 16.........................................................................8
Changes to Figure 17 and Figure 18 ...............................................9
Change to Figure 19 and Figure 20 .............................................. 10
Changes to Table 2.......................................................................... 11
8/12—Rev. 0 to Rev. A
Change LK3 Position from In to Out, Table 1...............................4
4/11—Revision 0: Initial Version

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266
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EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
The E VA L-CN-304-SDZ evaluation kit includes the software and
drivers on a CD. The software is compatible with Windows® XP,
Windows Vista, and Windows 7.
To install the software, follow these steps:
1. Install the software before connecting the E VA L-SDP-CB1Z
board to the USB port of the PC.
2. Start the Windows operating system and install the
software from the E VA L -CN-0304-SDZ evaluation kit CD.
3. After installation of the software and drivers is complete,
plug the E VA L -CN-304-SDZ into the E VA L-SDP-CB1Z
board, and then plug the E VA L -SDP-CB1Z board into the
PC using the USB cable included in the box.
4. When the software detects the evaluation board, proceed
through any dialog boxes that appear to finalize the
installation (Found New Hardware Wizard/Install the
Software Automatically and so on).
09791-003
Figure 2. Hardware Device Manager Window with the EVAL-SDP-CB1Z Board Plugged In

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RUNNING THE SOFTWARE
To run the evaluation board program, do the following:
1. Click Start/All Programs/Analog Devices/AD9834/
AD9834 Eval Board.
2. If the E VA L -SDP-CB1Z board is not connected to the USB
port when the software is launched, a connectivity error
displays (see Figure 3). Simply connect the E VA L -CN-304-
SDZ evaluation board to the USB port of the PC, wait a few
seconds, click Rescan, and follow the instructions.
3. Ensure that all links are in their correct locations (see Table 1).
The main window of the E VA L -CN-304-SDZ evaluation
software then opens, as shown in Figure 4.
09791-002
Figure 3. Pop-Up Window Error
Table 1. Default Setup for Link Positions
Link No. Position Function
LK1 A External DVDD supply powers the
on-board oscillator
B (default) On-board linear regulator selected
to supply power to the general
oscillator
LK2 A Digital block powered through the
DVDD external connector
B (default) 3.3 V digital supply for the AD9834
supplied by the EVAL-SDP-CB1Z
board
LK3 Out (default) Decouple the CAP/2.5V pin to ground
because V
DD
is >2.7 V
In Connect the jumper when the external
DVDD supply < 2.7 V
LK4 A Analog supply provided by the
external AVDD connector
B (default) 3.3 V analog supply for the AD9834
supplied by the EVAL-SDP-CB1Z
board
09791-004
Figure 4. EVAL-CN-304-SDZ Evaluation Board Software

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OPERATING THE SOFTWARE
Select External MCLK Frequency
Having selected the digital interface specifics, next use the
MCLK box to choose which frequency to use. The boards are
supplied with a 75 MHz general oscillator. If a different clock
source is required, the CLK1 SMB connector can be used to
supply a different MCLK value.
Two options for the general oscillator include the AEL3013
oscillators from AEL Crystals and the SG-310SCN oscillators
from Epson Electronics.
09791-005
Figure 5. MCLK Input
Programming Method: Hardware or Software
Functions that select frequency and phase registers, reset internal
registers, and power down the DAC can be implemented by
using either software or hardware. Click Software or Hardware
to select the programming method (see Figure 6). By choosing
hardware, the appropriate hardware control pins are used to
control these functions. By choosing software, the appropriate
software control bits are used to control these functions.
09791-006
Figure 6. Programming Method
Loading Frequency and Phase Registers
The desired output frequency and output phase can be loaded
using the inputs shown in Figure 7. Either the FREQ 0 register or
the FREQ 1 register can be loaded with frequency data. The
frequency data is loaded in megahertz, and the equivalent
hexadecimal code is shown to the right once data is entered; press
Enter to load the data. When data is loaded, the output appears on
the IOUT and IOUTB pins. Similarly, select either the PHASE 0
register or the PHASE 1register and the phase data loads in
degrees.
The analog output frequency from the AD9834 is defined by
fMCLK/228 × FREQREG
where FREQREG is the value loaded into the selected frequency
register in decimals. This signal is phase shifted by
2π/4096 × PHASEREG
where PHASEREG is the value contained in the selected phase
register in decimals.
09791-007
Figure 7. Frequency and Phase Load
FSK and PSK Functionality
In software mode, the AD9834 can be set up for FSK or PSK
functionality by entering the bit rate in milliseconds and by
clicking the PSK or FSK button (see Figure 8).
09791-008
Figure 8. FSK and PSK Functionality

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Waveform Options
The output waveform options that can be selected are sinusoidal
waveform or ramp waveform. The SIGN BIT OUT pin output
can be selected using three options: selecting MSB or MSB/2 of
the phase accumulator or selecting the internal comparator. If
this pin is not used, click DISABLE (see Figure 9).
09791-009
Figure 9. Waveform Profile and SIGN BIT OUT
Power-Down Options
The AD9834 has various power-down options selected through
the control register. The master clock (MCLK) or the DAC can
be disabled, or both sections can be powered down for a lower
power sleep mode (see Figure 10).
09791-010
Figure 10. Power-Down Options
Hardware Options
If the hardware programming method is selected (see Figure 6),
the FSELECT (FSEL0), PSELECT (PSEL0), RESET, and SLEEP
pin functions can be toggled. The GPIO outputs on the EVAL-
SDP-CB1Z board control these pin functions. For example,
frequency data can be loaded to the FREQ 0 register and the
FREQ 1 register and the output can be toggled by the FSELECT
pin, that is, 2FSK functionality.
09791-011
Figure 11. GPIO Hardware Pin Control
09791-012
Figure 12. FSEL0 Hardware Pin Control
Reset and Sweep
Use the Reset Bit button shown in Figure 13 to set the reset
software command. To set up a DDS sweep, click FREQUENCY
SWEEP.
09791-013
Figure 13. Software Reset and Sweep Select
The sweep function allows users to load a Start Frequency,
Stop Frequency, increment size (Step Frequency), number of
loops (N. of Loops), and Delay between each frequency
increment. These commands then load to the device
automatically from the E VA L -SDP-CB1Z board.
09791-014
Figure 14. Sweep Functionality

EVAL-CN-304-SDZ Evaluation Board User Guide UG-266
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Example of Operation
An example of configuring the AD9834 to output 1 MHz follows:
1. Plug the EVAL-SDP-CB1Z board into the EVAL-CN-304-SDZ
board and connect to the USB port.
2. Start up the software located at Start/All Programs/
Analog Devices/AD9834/AD9834 Eval Board. The
EVAL-SDP-CB1Z board begins to communicate with the PC.
3. Define MCLK; the default is an on-board 75 MHz
oscillator.
4. Ensure that all links are in the correct locations (see Table 1).
5. Select the FREQ 1 register.
6. Load a 1 MHz excitation frequency and press Enter.
The output should appear on the IOUT and IOUTB outputs on
the evaluation board.
For the FREQ 0 register, do the following:
1. Select the FREQ 0 register.
2. Load the FREQ 0 register with 2 MHz.
3. Press Enter.
For the FREQ 1 register, select the FREQ 1 register to load the
1 MHz associated with this register.
09791-015
CH2 100mV100mV M 200ns
0.00000s A CH1 216mVCH1
2
T
CH1 FREQUENCY: 1.000MHz
CH1 PEAK TO PEAK: 572mV
Figure 15. 1 MHz Output Signals on the IOUT and IOUTB Test Points

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EVALUATION BOARD SCHEMATICS AND LAYOUT
09791-016
Figure 16. EVAL-CN-304-SDZ Schematic Part A

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09791-017
Figure 17. EVAL-CN-304-SDZ Schematic Part B
09791-018
Figure 18. EVAL-CN-304-SDZ Component Side View Layer 1

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09791-020
Figure 19. EVAL-CN-304-SDZ Component Side View Silkscreen
09791-019
Figure 20. EVAL-CN-304-SDZ Component Side View Layer 2, Solder Side