Evaluation Board for
2-Channel 500 MSPS DDS with 10-Bit DACs
AD9958/PCB
EVALUATION BOARD BLOCK DIAGRAM
AD9958 EVALUATION BOARD
XTAL
BUFFER/XTAL
OSCILLATOR
J9
BALUN
REFCLK
MULTIPLIER
4X
TO
20X
MUX
REF_CLK
SYS
CLK
J3
DAC 0 OUT
J7
J13
÷4
SYNC_CLK
SYS
CLK
SYS
CLK
DAC 0 IOUT
DDS 0
DAC 0 FILTER OUT
LPF
DAC 0 IOUT
TIMING
AND
CONTROL
LOGIC
J4
DAC 1 OUT
J8
J11
SYNC_IN
SYS
CLK
DAC 1 IOUT
DDS 1
DAC 1 FILTER OUT
LPF
DAC 1 IOUT
J12
05783-001
SYNC_OUT
Figure 1.
FEATURES
GENERAL DESCRIPTION
Full-featured evaluation board for the AD9958
PC evaluation software for control and measurement of
the AD9958
USB interface
Graphic user interface (GUI) software with frequency sweep
capability for board control and data analysis
Factory tested and ready to use
This document serves as a guide to the setup and use of the
AD9958 evaluation board. The AD9958 is a multichannel
frequency synthesizer that incorporates two synchronous direct
digital synthesis (DDS) cores with many user-programmable
functions.
APPLICATIONS
AD9958 performance evaluation
GUI control panel for learning AD9958 programming
The evaluation board software provides a graphical user
interface for easy communication with the device along with
many user-friendly features such as the “mouse-over effect.”
Many elements of the software can be clarified by placing your
mouse over the element. Figure 19 shows how this feature
works when users place their mouse over the Ref Clock box.
This document is intended for use in conjunction with the
AD9958 data sheet, which is available from Analog Devices at
www.analog.com.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice.
No license is granted by implication or otherwise under any patent or patent rights of Analog
Devices.Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
AD9958/PCB
TABLE OF CONTENTS
Evaluation Board Block Diagram................................................... 1
Evaluation Board Software...............................................................5
Features .............................................................................................. 1
Installing the Software ..................................................................5
Applications....................................................................................... 1
Configuring the Evaluation Board..............................................5
General Description ......................................................................... 1
Loading the Software ....................................................................7
Revision History ............................................................................... 2
Feature Control Windows............................................................9
Evaluation Board Hardware ............................................................ 3
Setup Files.................................................................................... 17
Package Contents.......................................................................... 3
Schematics ....................................................................................... 24
Requirements ................................................................................ 3
Ordering Information.................................................................... 27
Setting up the Evaluation Board................................................. 3
Ordering Guide .......................................................................... 27
Evaluation Board Layout ............................................................. 4
ESD Caution................................................................................ 27
REVISION HISTORY
1/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 28
AD9958/PCB
EVALUATION BOARD HARDWARE
Table 2. Connections and Biasing Voltage
PACKAGE CONTENTS
Connector
TB1
TB1
TB1
TB1
J10
J16
J18
J20
The AD9958/PCB kit contains the following items:
•
AD9958 evaluation board
•
AD9958/PCB installation software
REQUIREMENTS
In order to successfully use the evaluation board and run the
software, the requirements listed in Table 1 must be met.
Table 1. AD9958/PCB Requirements
Item
Operating System
Processor
Memory
Ports
Clocking
Power Supplies
Measurement
Cables
Requirement
Windows® 98/Windows® ME/
Windows® 2000/Windows® XP
Pentium® I or better
128 MB or better
One USB port
Signal generator capable of generating
sinusoidal waves of at least 3 dBm power,
up to at least 10 MHz
Capability to generate at least two
independent dc voltages (1.8 V/3.3 V)
Appropriate measurement device, such as
a spectrum analyzer or a high bandwidth
oscilloscope
USB 1.1/2.0 cable, and SMA-to-X cables
(X = SMA or BNC, depending on the
connector of the device interfacing with
the board)
SETTING UP THE EVALUATION BOARD
Pin No.
1
2
3
4
Label
VCC_USB
DVDD_I/O
GND
DVDD
CLK_VDD
AVDD
BG_VDD
AVDD
Voltage (V)
3.3
3.3
0
1.8
1.8
1.8
1.8
1.8
Note that the AD9958/PCB is preconfigured so that the
CLK_VDD, BG_VDD, and all other AVDD connections are
tied together. Therefore, only one connection (J10, J16, J18, or
J20) needs power for proper functionality of the two channels.
These AVDD connections can be separated for better channel
isolation. This is accomplished by removing the 0 Ω resistors
(R21, R32 to R51, R54 to R64), which tie the planes together,
found on the back of the evaluation board. When doing this, be
sure that CLK_VDD, BG_VDD, and the AVDD connection for
all desired channel(s) are powered.
Clocking the Part
The AD9958 architecture provides the user with two options when
providing an input signal to the part. Figure 1 shows that the user
can clock the frequency synthesizer/DDS directly by connecting
an external clocking signal to the REF_CLK connector, J9, or by
providing an external crystal. Place Jumper W11 on REF_CLK
to use the external clocking option. To use an external crystal as
the clocking source, place Jumper W11 on CRYSTAL.
Please refer to the AD9958 data sheet for details on the maximum
input speeds and input sensitivities of these two inputs.
Powering the Part
The AD9958 evaluation board has five power supply
connectors: TB1, J10, J16, J18, and J20. TB1 powers the DDS,
the PC interface logic, and the USB circuitry. J10 powers the
input clock circuitry. J18 provides the reference voltage needed
for band gap functionality. J16 and J20 power the analog
circuitry of individual DACs. It is important to keep in mind
that the AD9958 evaluation board has been preconfigured so
that these two AVDD connections are tied together. Supplying
power to any one of the AVDD connections (J16 or J20) allows
for the proper functionality of the analog circuitry of both
DACs. Table 2 shows the necessary connections and the
appropriate biasing voltage.
Communicating with the Part
Two interface standards are available on the evaluation board:
•
USB 1.1/2.0 interface
•
Header row (U2, U13), which places the part under the
control of an external controller (such as a µP, FPGA, or DSP)
Analog Devices provides a GUI for the PC; it does not provide
control software for external controllers.
Use the jumper settings listed in Table 3 to enable different
modes of communication.
Table 3. Jumper Settings for Communication Modes
Mode
PC control, USB port
External control
Rev. 0 | Page 3 of 28
Settings
Set W7 to PC. Place a jumper on W1,
W2, W3, W9, and W10.
Set W7 to manual. Place a jumper on
W9, and remove W1, W2, W3, and W10
(or leave it stored as a shunt).
AD9958/PCB
EVALUATION BOARD LAYOUT
MULTIDEVICE
SYNCHRONOUS
CONTROL
MANUAL I/O
CONTROL
HEADERS
DAC
CHANNEL NOT USED
DAC
CHANNEL NOT USED
EVALUATION
BOARD
CONTROL
CLOCK
INPUT
SUPPLY
USB
PORT
CLOCK
MODE
SELECT
REF CLK
INPUT
SDIO
RU/RD
CONTROL
POWER
SUPPLY
DAC
CHANNEL 0
DAC
CHANNEL 1
05783-002
BAND
GAP
SUPPLY
Figure 2.
Manual I/O Control Headers
Power Supply
Provides the interface for communication with the AD9958
when the part is under the control of an external controller
(manual control). See Eval Board Control for correct jumper
settings.
Powers the AD9958’s USB circuitry, I/O circuitry, and the
digital portion (DVDD) of the DACs. Note AVDD is not
powered via this connector (TB1).
Multidevice Synchronous Control
These connections represent the DAC filtered/unfiltered output
and AVDD power supply.
DAC Channels
These connections set up the AD9958 for multidevice
synchronous operation.
RU/RD Control, SDIO
Clock Input Supply
Powers the AD9958’s clock input circuitry.
Jumper W6, Jumper W5, and Jumper W4 must be set to control
the Ramp Up/Ramp Down feature using the SDIO pins.
Clock Mode Select
USB Port
Controls whether the part is driven by a 20 MHz to 30 MHz
crystal provided by the user or by an external signal generator
such as REF_CLK.
When the part is under PC control (default mode), the evaluation
board communicates with the AD9958 via this port.
REF_CLK Input
These jumpers set up the AD9958 for manual or PC control
(control through the USB port). Figure 2 shows the correct
jumper placements for PC control. For manual control, remove
Jumper W0 to Jumper W3; set Jumper W7 on the manual
control pin (move jumper one position to the left).
Input for the external REF_CLK signal.
Band Gap Supply
Provides the voltage needed for band gap functionality.
Eval Board Control
Rev. 0 | Page 4 of 28
AD9958/PCB
EVALUATION BOARD SOFTWARE
4.
INSTALLING THE SOFTWARE
Then, this window (Figure 4) appears and disappears.
1.
Log on to your PC system with administrative privileges;
this is an essential requirement in successfully installing
the AD9958 evaluation software.
2.
Uninstall any previous versions of the AD9958 evaluation
software from your PC system.
3.
Insert the AD9958 evaluation software CD into your
CD-ROM drive. It is important not to connect the
AD9958 evaluation board to the computer until the
AD9958 evaluation software has been successfully
installed. Refer to the Readme.txt file located in the
Software folder before proceeding with the installation
of the AD9958 evaluation software.
4.
Run the setup.exe file located in the Software folder and
follow the AD9958 evaluation software’s on-screen
installation instructions.
05783-004
Follow these steps to install the AD9958 evaluation software.
Figure 4.
5.
If you are using Windows 2000, click Finish if you see this
window (Figure 5).
CONFIGURING THE EVALUATION BOARD
05783-005
Once the software has been successfully installed onto your PC,
the next step is to interface the AD9958 evaluation software to
the AD9958 evaluation board via the USB Port (see Figure 2).
For the evaluation board and software to communicate
properly, drivers must be loaded onto your PC system. The
following instructions explain how to install these drivers on
your PC system.
Figure 5.
6.
Next, the window in Figure 6 appears.
1.
Power up the AD9958 evaluation board (see Table 2).
2.
Connect the evaluation board to the computer using a USB
cable via the USB port; the VBUS LED (CR1 on AD9958
evaluation board) illuminates.
3.
When the USB cable is connected, this window appears
and then disappears (Figure 3).
05783-006
Windows 98/Windows ME/Windows 2000 Users
Figure 6.
05783-003
After the window has disappeared, the USB Status LED (CR2
on the AD9958 evaluation board) flashes, which indicates that
the evaluation board is connected properly.
Figure 3.
Rev. 0 | Page 5 of 28
AD9958/PCB
5.
Windows XP Users
Power up the AD9958 evaluation board (see Table 2).
2.
Connect the evaluation board to the computer using a USB
cable via the USB port. Then, the VBUS LED (CR1 on
AD9958 evaluation board) illuminates.
3.
When the USB cable is connected, the following window
appears (Figure 7). Click Next to continue.
05783-009
1.
Click Finish after this window (Figure 9) appears.
Figure 9.
Click Next after you see the following window (Figure 10).
05783-007
6.
Figure 7.
05783-010
Click Continue Anyway when you see the window in
Figure 8.
Figure 10.
7.
Click Continue Anyway when this window
(Figure 11) appears.
05783-008
Figure 8.
05783-011
4.
Figure 11.
Rev. 0 | Page 6 of 28
AD9958/PCB
8.
After the window in Figure 12 appears, click Finish to exit.
LOADING THE SOFTWARE
Follow these three steps to load the AD9958 evaluation
software.
Before starting the software, make sure that the AD9958
evaluation board is powered up, connected to the
computer, and that the USB Status LED is flashing.
2.
Click the Start button, located at the bottom left-hand
corner of your desktop.
3.
Select All Programs > AD9958_59 Eval Software
folder > AD9958_59 Eval Software to load the software
(see Figure 13).
05783-012
1.
Figure 12.
05783-013
Once this screen has disappeared, you should notice that the USB
Status LED (CR2 on AD9958 evaluation board) is flashing, which
indicates that the evaluation board is connected properly.
Figure 13.
After completing these steps, the AD9958 evaluation software
loads onto your PC system. You are then presented with one of
several status messages. These messages are discussed in further
detail in the next section, Status Messages upon Loading
Software.
Rev. 0 | Page 7 of 28
AD9958/PCB
Status Messages upon Loading Software
Once the AD9958 evaluation software has been loaded, a green
splash screen appears as shown in Figure 14. The status box
within the splash screen gives the status of the AD9958
evaluation software. A cursor is provided for easy navigation
throughout this box. Green writing in the status box indicates
that the software has loaded successfully.
A splash screen with red writing in the status box indicates that
the software did not load successfully and that an error occurred
(see Figure 15). Scrolling up through the status box with the
cursor indicates why the software did not load correctly.
Most status message errors can be resolved by checking jumper
settings, making sure that the evaluation board is powered up
correctly, and inspecting the USB port and cable connections.
When all power connections, USB port/cable connections, and
jumper settings are correct, an error can still appear if the clock
input is not properly configured. If this occurs, a pop-up
window appears in the center of the splash screen explaining
that the software does not recognize the REF_CLK input.
Follow the directions given (see Figure 16).
05783-014
SPLASH SCREEN
05783-015
05783-016
Figure 14. Successful Load
Figure 16. REF_CLK Not Recognized
Figure 15. Error Message
Rev. 0 | Page 8 of 28
AD9958/PCB
FEATURE CONTROL WINDOWS
Chip Level Control
2
5
6
3
1
05783-017
4
Figure 17. Chip Level Control Window
The Chip Level Control window provides control of the
features that affect all channels of the AD9958; this window is
not channel-specific. The following section describes the
options in the Chip Level Control window as they are
numerically indexed in Figure 17.
2.
Clock
Clock allows the user to configure the reference clock path in
the AD9958.
LOAD and READ
The LOAD and READ buttons are used to send data and
retrieve register settings. All LOAD and READ buttons found in
the evaluation software have the same functionality.
When new data is detected, LOAD flashes orange, indicating
that you need to click LOAD to send the updates to the serial
I/O buffer where they are stored until an I/O update is issued.
The I/O update sends the contents of the serial I/O buffer to
active registers.
05783-018
I/O updates can be sent manually (Manual I/O Update) or
automatically (Auto I/O Update). By default, the AD9958
evaluation software is set to Auto I/O Update, so that when
LOAD is clicked, an I/O update signal is automatically sent to
the device. If synchronization across channels is desired, use the
Manual I/O Update button. To do this, deselect the Auto I/O
Update box and click the Manual I/O Update button when you
wish to send an I/O update (see Figure 18).
Ref Clock inputs the operating frequency of the external
reference clock or crystal. The maximum reference clock
frequency of the AD9958 is 500 MHz, which is the default
setting of this box. A red outline indicates that the value entered
is out of range (see Figure 19).
05783-019
1.
Click READ to perform a readback of the current state of the
settings and update the GUI with those settings.
Figure 19.
Multiplier selects the PLL multiplication factor (4× to 20×) by
which to scale the input frequency. The default setting of this
box is Disabled, indicating that the Ref Clock Multiplier
circuitry is bypassed and the Ref Clock/Crystal input is piped
directly to the DDS core.
Figure 18.
Rev. 0 | Page 9 of 28
AD9958/PCB
CP Current selects the charge pump current output of the PLL
in the Ref Clock Multiplier circuitry. Selecting a higher current
output results in the loop locking faster, but there is a trade-off.
Increasing this current output also increases phase noise. The
default setting of this box is 75 μA.
System Clock displays the operating frequency of the DDS core
(system). The value shown here is derived from the values
entered in the Ref Clock and Multiplier boxes.
05783-020
VCO Gain is automatically set when the Ref Clock Multiplier is
being used to generate a system clock that is greater than
255 MHz. This is done to ensure stability of the Ref Clock
Multiplier circuitry. A pop-up window appears alerting you to
this update (see Figure 20).
Figure 20.
Please refer to the Reference Clock Modes section of the
AD9958 data sheet for more information regarding clock
modes and operation.
3.
The AD9958 can be configured to perform many operations in
various combinations. Please refer to the Channel Constraint
Guidelines and the Modulation Mode sections of the AD9958
data sheet for more details regarding the use of the RU/RD
function in combination with the different modes of operation
(single tone, modulation, linear sweep) of the AD9958. For
more information regarding the theory of the RU/RD
operation, note the Output Amplitude Control Mode section of
the AD9958 data sheet.
Level selects the desired level of modulation of the AD9958.
The AD9958 can perform 2-level, 4-level, 8-level, or 16-level
modulation of frequency, phase, or amplitude (FSK, PSK, ASK).
This modulation is controlled via the data pins; note the
Channel Constraint Guidelines and the Modulation Mode
sections of the AD9958 data sheet for more details.
5.
All Channel Accumulator Control
The All Channel Accumulator Control provides control over
the phase and sweep accumulators for both channels.
Select the Auto Clear Phase Accumulator or Auto Clear
Sweep Accumulator boxes to clear and release the
corresponding accumulator. The autoclear function sets the
accumulator to 0 and then begins accumulating.
Modulation Configuration
Modulation Configuration configures the modulation
operation of the AD9958.
Profile Pin Config provides access to the PPC Bits
(FR1<14:12>). These bits are used to control the modulation
scheme of the AD9958. PPC Bit 0 is the LSB (FR1<12>), and
PPC Bit 2 is the MSB (FR1<14>).When a PPC bit is selected, it
is set to Logic 1 from its default setting of 0. These bits are
discussed in more detail in the Modulation Mode section.
Multi Device Sync
It is possible to synchronize multiple evaluation boards. Refer to
the Synchronizing Multiple AD9958 Devices section in the
AD9958 data sheet and the evaluation board schematic (located
in the schematic folder of the AD9958_59 evaluation software
CD) for more details on synchronizing multiple AD9958s.
6.
Select the Clear Phase Accumulator or Clear Sweep
Accumulator boxes to clear and hold the corresponding
accumulator. The clear function clears and then holds the
contents of the corresponding accumulator to 0 until the box is
deselected.
4.
Select Use Profile Pins 2 & 3 if you would like to control the
RU/RD feature with Profile Pin 2 and Profile Pin 3, or Use
Profile Pin 3 to control this feature using only Profile Pin 3. If
you wish to use the SDIO data pins to control this feature,
simply select Use SDIO Pins 1, 2 & 3. Note that to use the SDIO
pins to control the RU/RD feature, the SDIO and RU/RD
control jumpers must be placed (see Figure 2). The default
setting of this box is RU/RD Disabled. In this mode, you are
not able to scale the output amplitude.
All Channel Power Down
All Channel Power Down allows you to power down both
channels collectively using software configurations or the
external power-down options found in External PD Control.
Select the Clock Input, DAC Ref, or Disable SyncCLK Out
boxes to power down those circuit blocks, respectively, for each
individual channel. Once the selection has been made, click the
LOAD button to execute the power down.
When using the External PD Control, select from the Power
Down Pin Mode: Quick Recovery (default setting) or Full
Power Down. In quick recovery mode, only the digital logic is
powered down whereas all functions are powered down in full
power-down mode. To execute the power down when using
external PD control, you must click the Power Down Pin.
When pressed, the power-down pin is at Logic 1, indicating
the power-down mode. When this pin is not pressed, it is at
Logic 0, indicating the power-up mode.
RU/RD assigns which pins control the scaling (Ramp Up/Ramp
Down) of the output amplitude of the AD9958. This feature can
be controlled via the profile or SDIO data pins.
Rev. 0 | Page 10 of 28
AD9958/PCB
Channel Control
1
5
6
2
3
7
4
05783-021
8
Figure 21. Channel Control Window
1.
Channel 0 and Channel 1
Use the Channel 0 and Channel 1 tabs to select which specific
channel options to configure. The AD9958 has two independent
channels: Channel <0:1>. The default channel tab setting is
Channel 0.
2.
Pwr Down
Use Pwr Down to power down the digital logic (select Digital)
or the DAC circuitry (select DAC). Upon default, both of these
boxes are not selected, indicating that the digital logic and the
DAC circuitry of that channel are enabled (powered up).
3.
Modulation Output Type
The Modulation Output Type list controls what type of
modulation is performed on the channel’s output. Select Phase,
Frequency, Amplitude, or None (Single Tone) depending on
which type of modulation you want. The level of modulation
for the channel is set using the Chip Level Control window
under Modulation Configuration in the Level box.
4.
05783-022
The Channel Control window provides control of the features
that affect the AD9958 at a channel-specific level. The following
section describes the options of the Channel Control window
as they are numerically indexed in Figure 21.
Linear Sweep Options
Use the Linear Sweep Options to control the linear sweep
features. Select Enable Linear Sweep to turn on the linear
sweep function and the additional associated options (see
Figure 22).
Figure 22.
Select Linear Sweep No Dwell to enable this feature. See the
Linear Sweep No Dwell Mode section of the AD9958 data sheet
for more information regarding the no dwell feature.
When you select Load SRR @ I/O Update, the contents of the
sweep ramp rate register are loaded into the sweep ramp rate
timer every time an I/O_UPDATE is sent to the device.
The Clear Sweep Accumulator and Auto Clear Sweep
Accumulator have the same basic functionality as described in
the All Channel Accumulator Control section. The difference is
that here the function is channel-specific.
See the Linear Sweep (Shaped) Modulation Mode section of the
AD9958 data sheet for a detailed explanation of this mode.
5.
Pipe-Line Latency Control
When you select the Match Pipe Delays box under Pipe-Line
Latency Control, the pipeline delay for updates to frequency,
amplitude, and phase are equal, but only for the channels
operating in single tone mode. The default setting of this box is
not selected, meaning the pipeline delay for updates to
frequency, amplitude, and phase is not equal.
Rev. 0 | Page 11 of 28
AD9958/PCB
See the DATA LATENCY (PIPELINE DELAY) section in the
Specifications table of the AD9958 data sheet for the exact
timing delays with and without this feature enabled. Also, refer
to the Single Tone Mode-Matched Pipeline Delay section of the
AD9958 data sheet.
In the Output Waveform box, select either a Cosine or a Sine
function for the angle-to-amplitude conversion. The default
setting is Cosine.
6.
8.
DAC Full Scale Current Control
Use DAC Full Scale Current Control to scale the output
current of the DAC. Select either Full Scale (default setting),
½th Full Scale, ¼th Full Scale, or ⅛th Full Scale for the DAC
output current. See the Scalable DAC Reference Current
Control Mode section of the AD9958 data sheet.
7.
Output Waveform
Phase Accumulator Control
The Clear Phase Accumulator and Auto Clear Phase
Accumulator have the same basic functionality as described in
the All Channel Accumulator Control section. The difference
here is that the function is channel-specific.
Rev. 0 | Page 12 of 28
AD9958/PCB
Channel Output Config
1
4
2
05783-023
3
Figure 23. Channel Output Config Window
The Channel Output Config window configures various
output characteristics of the channel(s). Use the Channel 0
and Channel 1 tabs to select which specific channel options
to configure. The following section describes the options that
are numerically indexed in Figure 23.
1.
The Frequency 00 box also sets the starting point of the linear
frequency sweep and the first level in frequency modulation (FSK).
Phase Offset consists of two fields. In the first field, set the
integer factor (1 to 999) to increment or decrement the phase
offset. The default setting of this field is 1, indicating that the
phase offset is incremented/decremented by .022 degrees when
pressing the up or down arrow keys. The value of .022 degrees is
derived from this equation:
Single Tone Setup
Use Single Tone Setup to configure the channel output for the
single tone mode of operation (default).
Enter the desired output frequency directly in the Frequency 00
box or double-click the Frequency 00 box to launch the Edit
Output Frequency pop-up box to set the output frequency in
the Frequency box. The output frequency can alternatively be
set in decimal, hex, or binary format by editing the respective
boxes in Tuning Word Values (see Figure 24).
1
Integer Factor × ⎛⎜ (14 bits of phase resolution)−1 ⎞⎟ × 360 °
⎝2
⎠
Therefore, entering a factor of 3 in the first field allows you to
increment/decrement the phase offset by .066 degrees. In the
second box, input the desired phase offset (from 0 degrees to
360 degrees) of the output signal.
05783-024
The Phase Offset box also represents the starting point of the
linear phase sweep and the first level in phase modulation
(PSK).
Figure 24.
In order to use the output amplitude scalar, the Enable ASF
check box must be selected. In the first field, set the integer factor
(1 to 999) to increment or decrement the amplitude scale factor.
The default setting of this field is 1, meaning the output
amplitude is scaled up/down by .00098 when pressing the up or
down arrow keys. The value of .00098 is derived from this
equation:
Note that the Phase Offset, Enable ASF, Amplitude Ramp
Rate, Rising Step Size, Rising Step Interval, Falling Step Size,
and Falling Step Interval boxes all offer the edit option shown
in Figure 24 by double-clicking their respective boxes.
Rev. 0 | Page 13 of 28
1
Integer Factor × ⎛⎜ (10 bits of output amplitude scalar resolution)−1 ⎞⎟
⎝2
⎠
AD9958/PCB
In the second field, set the desired output amplitude scale factor
(between 0 and 1) of the output signal, where 1 is equivalent to
full scale.
The Enable ASF check box also represents the starting point of
the linear amplitude sweep and the first level in amplitude
modulation (ASK). Note that when performing linear
amplitude sweeps, the Enable ASF check box must be left clear.
Profile Registers
The AD9958 features up to 16 programmable registers per
channel as shown in Figure 23. Due to certain channel
constraints, however, there are limitations on how the Profile
Registers can be used in some configurations as described in the
Channel Constraint Guidelines section of the AD9958 data sheet.
Use the Profile Registers to enter the information needed for
modulation (FSK, PSK, or ASK) and linear sweep modes of
operation. Upon default, the Profile Registers are configured
for frequency inputs, but these registers can be changed to
intake phase or amplitude information by selecting the desired
modulation type in the Modulation Output Type list in the
Channel Control window. Figure 27 shows how the Profile
Registers appear when phase modulation (PSK) is selected.
05783-025
When using the RU/RD feature, the Enable Auto ASF check
box must be selected. Once the Enable Auto ASF check box has
been selected, the Amplitude Ramp Rate, Amplitude Step
Adjust, and the Load ARR @ I/O Update options are available
(see Figure 25).
2.
Figure 25.
⎛
1
⎜
⎜ SYNC CLK
⎝
05783-027
Use the Amplitude Ramp Rate field to set the amplitude ramp
rate (ARR) time. This time (entered in μs) can range from a
minimum value of
⎞
⎟ ×1
⎟
⎠
Figure 27.
to a maximum value of
⎛⎛
1
⎜⎜
⎜ ⎜ SYNC CLK
⎝⎝
⎞ (8 bits of output ramp rate resolution )−1 ⎞
⎟
⎟×2
⎟
⎟
⎠
⎠
05783-026
This implies that if the system clock is 500 MHz, the ARR value
can range from 8 ns (minimum) to 2.040 μs (maximum). If the
value entered exceeds the maximum time, a pop-up window
(Figure 26) alerts the user that the value entered will be changed
to the appropriate maximum value.
When the channel is in the modulation or linear sweep mode of
operation, input the starting frequency in the Frequency 00
field, starting phase in the Phase Offset field, and the starting
amplitude in the Enable ASF field. In modulation mode, use
the Profile Registers to input frequency, phase, or amplitude
information for the level of modulation selected. For instance, if
4-level frequency modulation is selected, input the starting
frequency in the Frequency 00 field, second frequency in the
Frequency 01 field, third frequency in the Frequency 02 field,
and fourth frequency in the Frequency 03 field. An example of
using the Profile Registers for 2-level frequency modulation is
shown in Figure 28. In this configuration, the frequency starts
at 10 MHz and ramps up to 50 MHz.
Figure 26.
In the Amplitude Step Adjust drop-down box, select the
amplitude scale factor step size. The default setting of this dropdown box is 1, indicating that step size is 1 LSB. A selection of
8 means the step size is 8 LSB.
Select Load ARR @ I/O Update to load the contents of the
amplitude ramp rate register into the amplitude ramp rate timer
every time an I/O_UPDATE is sent to the device.
Rev. 0 | Page 14 of 28
AD9958/PCB
If performing 2-level frequency modulation (no RU/RD) and
had the same configurations as shown in Figure 28, P2 would
be used to control the modulation on CH0 (see datasheet for
more information). Therefore, the output of CH0 stays at
10 MHz until the P2 button is clicked. Once the P2 button is
selected, the frequency changes to 50 MHz. To return to
10 MHz, simply release (click off) P2.
For more information regarding the use of the profile and SDIO
data pins to control various modulation, linear sweep, and
RU/RD schemes, refer to the Modes of Operation section of the
AD9958 data sheet.
4.
Linear Sweep Setup
Use Linear Sweep Setup to setup the slope of the linear sweep.
In the Rising Step Size field, enter the desired value for the
rising step size. Input the amount of time you wish to be spent
at each step in the Rising Step Interval field.
05783-028
Input the desired falling step size in the Falling Step Size field,
and the time that should be spent at each step in the Falling
Step Interval field. The Rising/Falling Step Size fields are
similar to the Profile Registers; upon default, they are set up for
frequency inputs, but these boxes can be changed to intake
phase or amplitude information by selecting the type of linear
sweep desired in the Modulation Output Type list in the
Channel Control window.
Figure 28.
In the linear sweep mode of operation, only the first Profile
Register field (Frequency 01, Phase 01, or Amplitude 01) is
used. It indicates the ending point of the sweep. In Figure 28,
the frequency linear sweep begins at 10 MHz and ends at
50 MHz.
3.
The number of steps in a ramp can be calculated by determining
the difference between the starting and ending points of the
sweep and dividing by the step size. The time required to sweep
is then the number of steps times the amount of time spent at
each step.
Profile and RURD Pin Control
Profile and RURD Pin Control cover the profile pins (P0, P1,
P2, and P3) and SDIO data pins (SDIO1, SDIO2, and SDIO3).
The profile pins can be configured to control modulation, linear
sweep, or RU/RD operations, whereas the SDIO data pins can
only control the RU/RD operation. To perform the desired
modulation, linear sweep, or RU/RD operation, toggle the
profile/SDIO data pin(s) associated
with that operation. When these pins are pressed, they are set
to Logic 1 (see Figure 29).
The range of the Rising/Falling Step Interval is computed
similarly to the time range for the Amplitude Ramp Rate. Note
that the Rising Step Interval and Falling Step Interval boxes also
have the pop-up window feature exhibited in Figure 25 when
the maximum rising/falling step interval value is exceeded.
For more information regarding the Linear Sweep Setup, refer
to the Setting the Slope of the Linear Sweep section of the
AD9958 data sheet.
05783-029
Debug
Figure 29.
Upon default, the Auto check box is selected, meaning that
once you click one of the pins (profile or SDIO), the action
executes. If this box is deselected, the Apply button must be
clicked before the desired action is carried out. The Apply
button mimics the LOAD button; it flashes orange when new
data is detected, but all changes and updates occur
simultaneously when Apply is clicked.
The Debug window, shown in Figure 30, lets you write directly to
any of the AD9958’s internal registers and subsequently read
them back. Use View Channel to select which channel’s internal
registers you would like to view. The default setting of this box is
Channel 0. To access the internal registers of the selected channel,
use the RegAddr drop menu to select which register(s) you
would like to read/write. You can also directly toggle the states of
any external input pins such as the profile or SDIO data pins.
Rev. 0 | Page 15 of 28
AD9958/PCB
DUT I/O Box
05783-030
This dialog box (Figure 32) controls the I/O configuration for
the device. Click I/O Reset to send an I/O reset to the
corresponding serial port state machine. Select LSB First to
change the data format to LSB first from the default setting of
MSB first. Use the Serial I/O Mode drop-down list to select the
desired serial I/O mode of operation: Single Bit-2 Wire
(default), Single Bit-3 Wire, 2-Bit Serial, or 4-Bit Serial. For
more information, please refer to the Serial I/O Modes of
Operation section of the AD9958 data sheet.
Figure 30.
05783-032
To access the Debug window, click View > Debug Window (see
Figure 31).
05783-031
Figure 32.
To access the DUT I/O dialog box, click the I/O menu (left of
view—see Figure 31) and select DUT I/O.
Figure 31.
Rev. 0 | Page 16 of 28
AD9958/PCB
SETUP FILES
Introduction
The AD9958 can be configured to perform many operations in various combinations. Preconfigured setup files have been included with the
AD9958 evaluation software that show the device in all three modes of operation: single tone, modulation, and linear sweep. These
example setup files serve as a reference and/or starting point when trying to configure the device for a desired setup for the first time.
05783-033
05783-034
To load these setup files click File > Load Setup (Figure 33), or click the Load Setup File icon (Figure 34) to access these files.
Figure 34.
Figure 33.
05783-035
Next, open the AD9958 Configuration Files folder (Figure 35).
Figure 35.
05783-036
Then select which mode of operation setup file(s) you would like to view (see Figure 36).
Select Linear Sweep Mode, Modulation Mode, or Single Tone Mode.
Figure 36.
Rev. 0 | Page 17 of 28
AD9958/PCB
Single Tone Mode
Open the Single Tone Mode folder to access the single tone mode of operation example setup files. This section discusses the
Both Channels on @30_40MHz_RURD enabled.stp file.
05783-037
The Chip Level Control window (Figure 37) from this particular setup shows that a 500 MHz System Clock is running, with the RU/RD
operation enabled. In the RU/RD list, Use Profile Pins 2 & 3 has been selected to control the RU/RD feature.
Figure 37.
05783-038
In the Channel Control window (Figure 38), each channel has None (Single Tone) selected for their modulation output as shown in the
Modulation Output Type list.
Figure 38.
Rev. 0 | Page 18 of 28
AD9958/PCB
05783-039
In the Channel Output Config window (Figure 39), Channel 0 has a frequency output of 30 MHz (Frequency 00 box) and Channel 1 an
output frequency of 40 MHz. Because the RU/RD operation is enabled, the Enable ASF and Enable Auto ASF check boxes are selected.
The amplitude scalar factor (ASF) is set to 1 (full scale). Therefore, the output signal is 0 MHz until the correct profile pin is selected to
ramp the frequency up to full scale. When this setup file is loaded, Profile Pin P2 and Profile Pin P3 are pressed as shown in Profile and
RURD Pin Control. P2 controls Channel 0 and P3 controls Channel 1. If a profile pin is deselected, the associated channel’s output
returns to 0 MHz. To return to full scale, re-press the profile pin that triggers the RU/RD operation.
Figure 39.
Modulation Mode
05783-040
Open the Modulation Mode folder to access the modulation mode of operation example setup files. Once this folder is opened you are
presented with the window shown in Figure 40.
Figure 40.
For frequency modulation (FSK), open the Frequency folder; for phase modulation (PSK), open the Phase folder; and for amplitude
modulation (ASK), open the Amplitude folder. In these folders, all setup files are indexed by their level (2-, 4-, 8-, or 16-level). This
section discusses the CH0_@3 MHz increments.stp file found in the Frequency folder under the 16-level folder.
Rev. 0 | Page 19 of 28
AD9958/PCB
05783-041
The Chip Level Control window (Figure 41) from this particular setup shows that a 500 MHz System Clock is running, and that a 16level modulation-no RU/RD is being performed. Notice the Level list located in Modulation Configuration. The PPC Bit pattern in the
Profile Pin Config of Modulation Configuration is <010>. Referring to the table in the 16-Level Modulation—No RU/RD section of the
AD9958 data sheet, you see that this bit pattern sets up 16-level modulation on Channel 0.
Figure 41.
05783-042
In the Channel Control window (Figure 42), Channel 0 has Frequency selected as its modulation output as shown in the Modulation
Output Type list. As discussed in the Channel Constraint Guidelines section of the AD9958 data sheet, when performing 16-level
modulation on a selected channel, all other channels are available only for the single tone mode of operation.
Figure 42.
Rev. 0 | Page 20 of 28
AD9958/PCB
05783-043
In the Channel Output Config window (Figure 43), Channel 0 has a frequency output of 3 MHz (Frequency 00 box). When this setup
file is loaded, Profile Pin P1 and Profile Pin P3 are pressed as shown in Profile and RURD Pin Control. In 16-level modulation, P3 is the
LSB and P0 is the MSB. This explains why when this setup file is loaded, an output of 18 MHz is shown because 0101 binary = 5, and
Profile Register 05 contains 18 MHz as its output. If no profile pins are selected, the output frequency is equivalent to the value entered
in the Frequency 00 box (3 MHz in this setup). If all profile pins are pressed, the output frequency is equal to 48 MHz, the contents of
Profile Register 15 (1111 binary).
Figure 43.
Linear Sweep Mode
05783-044
Open the Linear Sweep Mode folder to access the linear sweep mode of operation example setup files. Once this folder is opened you are
presented with the window shown in Figure 44.
Figure 44.
For a frequency sweep, open the Frequency folder; for a phase sweep, open the Phase folder; and for an amplitude sweep, open the
Amplitude folder. This section discusses the Both Channels@10MHz_half to full scale.stp file found in the Amplitude folder.
Rev. 0 | Page 21 of 28
AD9958/PCB
05783-045
The Chip Level Control window (Figure 45) from this particular setup shows that a 500 MHz System Clock is running with RU/RD
disabled. The Auto Clear Phase Accumulator and Auto Clear Sweep Accumulator check boxes have been selected in All Channel
Accumulator Control to ensure synchronization across channels and reinitialize the starting point once the linear sweep ends.
Figure 45.
05783-046
In the Channel Control window (Figure 46), each channel has Amplitude selected for its modulation output as shown in the
Modulation Output Type list. As discussed earlier in the Linear Sweep Options section, the Enable Linear Sweep check box found in
Linear Sweep Options must be selected in order to configure the part for the linear sweep mode of operation.
Figure 46.
Rev. 0 | Page 22 of 28
AD9958/PCB
05783-047
In the Channel Output Config window (Figure 47), both channels (Channel 0 and 1) have an output frequency of 10 MHz (Frequency
00 box). The Enable ASF check box is deselected because a linear amplitude sweep is being performed. The amplitude scalar factor (ASF)
is set to 0.5 (half scale), denoting that the sweep begins at half scale and sweeps up to full scale (Amplitude 01-ending point of sweep). In
Linear Sweep Setup, the rising/falling step size and step intervals of the sweep are equal, indicating the sweep rises and falls at the same
rate. P2 controls Channel 0 and P3 controls Channel 1. To sweep up to full scale, press the profile pin associated with the channel’s
output. To return to half scale, unselect the profile pin.
Figure 47.
Rev. 0 | Page 23 of 28
Figure 48. AD9958/PCB Schematic, Page 1
R59
0Ω
R56
0Ω
GND
BG_VDD
GND
C62
0.1µF
C55
0.1µF
C65
0.1µF
GND
CLK_VDD
GND
GND
AVDD3
GND
C54
0.1µF
DVDD_IO
C56
0.1µF
AVDD2
AVDD1
DVDD
C50
0.1µF
GND
C53
0.1µF
R50
0Ω
C49
0.1µF
C44
0.1µF
C46
0.1µF
C52
0.1µF
GND
DAC3_OUT
C48
0.1µF
C45
0.1µF
C51
0.1µF
C57
0.1µF
1
6
ADTT1-1
2
T5
5
4
3
1
ADTT1-1
6
DAC1/AD9958
DAC3/AD9959
GND
2
3
5
4
T4
DAC0/AD9958
DAC2/AD9959
AVDD1
DAC2_OUT
R60
0Ω
R57
0Ω
R63
0Ω
BYPASS CAPACITORS
R61
0Ω
R58
0Ω
R62
0Ω
GND
AVDD0
AVDD3
AVDD2
AVDD3
AVDD2
R64
0Ω
AVDD2
AVDD0
AVDD1
AVDD3
AVDD0
R7
50Ω
AVDD3
R8
50Ω
AVDD0
AVDD1
R5
50Ω
AVDD2
R6
50Ω
AVDD1
J12
SYNCOUT
U10
GND
14
13
11
12
10
9
7
8
6
5
3
4
2
1
J9
REF CLK
GND
GND
6
4
5
U10
74LVC125A
P2
D2_DGND
D2_AVDD
1.91kΩ
R11
D3_IOUT
D3_IOUTB
D3_DGND
D3_DVDD
D2_IOUTB
D2_AGND
4
T1
SEC
3
GND
R31
25Ω
R10
50Ω
R30
25Ω
GND
0.1µF
C22
0.1µF
C21
GND
C66
39pF
0Ω
R52
x2
2
0Ω
R53
25MHz
1
698Ω
R9
GND
29
30
32
31
33
34
36
35
37
38
40
39
41
42
GND
AVDD0
GND
GND
AVDD0
AVDD1
GND
AVDD1
P1
P0
P2
R2
50Ω
R4
50Ω
AVDD0
AVDD0
R3
50Ω
AVDD0
AVDD1
AVDD1
R1
50Ω
AVDD1
T2
4
5
6
J10
J20
J16
GND
DVDD_IO
GND
DAC1_OUT
GND
DAC0_OUT
DAC0/AD9959
T3
ADTT1-1
3
2
1
4
5
6
DAC1/AD9959
GND
+
BG_VDD
AVDD3
AVDD0
C35
10µF
C64
10µF
GND
+
ADTT1-1
3
2
1
C36
10µF
GND
+
VCC_USB
J18
J17
GND
C69
10µF
NOTE
THE D0 AND D1 PINS ARE ONLY USED FOR THE
AD9959, WHICH HAS DAC0, DAC1, DAC2, AND DAC3.
THE AD9958 USES THE D2 PINS FOR DAC0 AND
THE D3 PINS FOR DAC1.
C67
39pF
680pF
C38
D0_IOUT
D0_IOUTB
D0_AVDD
D0_DGND
D1_AGND
D0_DVDD
D1_IOUTB
D1_AVDD
D1_IOUT
D2_DVDD
D2_IOUT
D1_DVDD
D1_DGND
PWR_DWN
P1
P0
U3
AD9958/
AD9959
J13
SYNC CLK
SYNC_OUT
RESET
SYNC_IN
J11
ETC1-1-13
5
1
PRI
CLK_VDD GND
W11
CLK_MODE_SEL
GND
AVDD3
GND
AVDD2
AVDD2
GND
PWR_DWN
RESET
GND
1
74LVC125A
3
2
SYNCIN
56
15
D3_AVDD
D3_AGND
16
17
AVDD3
GND
AVDD1
SYNC_CLK
18
GND
R51
0Ω
BG_VDD
GND
R54
0Ω
CLK_VDD
R21
0Ω
19
BG_VDD
CLK_GND
20
21
CLK_VDD
22
R55
0Ω
GND
REF_CLKB
23
REF_CLK
CMS
24
25
CLK_MODE_SEL
AVDD0
SDIO_3
GND
DVDD
55
54
DGND1
DVDD1
SDIO_3
53
SYNC_CLK
DAC_RSET
SDIO_2
SDIO_1
52
BG_GND
SDIO_0
51
50
SDIO_2
SDIO_1
DVDD_IO
SCLK
49
SDIO_0
CSB
48
47
DVDD_IO
SCLK
IO_UPDATE
IO_UPDATE
26
CLK_VDD
AVDD0
DVDD
GND
PLL/DLL_VDD
LOOP_FILT
46
CS
DVDD
GND
45
PLL/DLL_GND
P3
44
43
P3
D0_AGND
27
28
Rev. 0 | Page 24 of 28
GND
+
C68
10µF
4
3
2
1
C47
10µF
C37
10µF
DVDD
GND
DVDD_IO
VCC_USB
GND
+
CLK_VDD
AVDD3
AVDD2
DVDD
C63
10µF
GND
+
GND
+
TB1
+
C58
10µF
GND
+
05783-051
J19
AD9958/PCB
SCHEMATICS
Figure 49. AD9958/PCB Schematic, Page 2
Rev. 0 | Page 25 of 28
J8
DAC 1/AD9958
DAC 3/AD9959
DUT FILTER OUT
J7
DAC 0/AD9958
DAC 2/AD9959
DUT FILTER OUT
GND
GND
GND
GND
C12
_F
GND
C14
_F
C72
_F
C71
_F
_F
GND
C73
_F
L6
C79
L5
C70
C75
_F
_F
L4
C74
_F
GND
_F
GND
GND
200MHz LOW-PASS FILTER
C78
C76
_F
C13
_F
_F
_F
L3
C20
_F
L2
C11
C16
_F
L1
C15
_F
GND
C19
C17
_F
GND
200MHz LOW-PASS FILTER
GND
GND
GND
GND
C80
_F
C77
_F
C60
_F
C18
_F
0Ω
R27
0Ω
R27
DAC2_OUT
R26
0Ω
DAC3_OUT
J4
DAC 1/AD9958
DAC 3/AD9959
DUT OUT/FILTER IN
R28
0Ω
J3
DAC 0/AD9958
DAC 2/AD9959
DUT OUT/FILTER IN
J6
DAC 0
DUT FILTER OUT
J5
DAC 1
DUT FILTER OUT
GND
GND
GND
GND
C6
_F
C3
_F
L11
_F
GND
L7
C82
_F
_F
C90
C85
_F
GND
GND
C84
_F
GND
GND
C5
_F
C1
_F
_F
C10
L10
GND
GND
C7
_F
C2
_F
L12
_F
C9
L9
_F
C81
C86
_F
200MHz LOW-PASS FILTER
C34
C83
_F
L8
_F
C89
C87
_F
GND
200MHz LOW-PASS FILTER
GND
GND
GND
GND
C8
_F
C4
_F
C91
_F
C88
_F
0Ω
R25
0Ω
R22
DAC1_OUT
J1
R24
0Ω
DAC0_OUT
J2
DAC 0/AD9959
DUT OUT/FILTER IN
R23
0Ω
DAC 1/AD9959
DUT OUT/FILTER IN
05783-052
GND
AD9958/PCB
AD9958/PCB
I/O HEADERS
U13
1
3
5
7
9
11
13
15
17
19
21
23
25
PWR_DWN_U
RESET_U
SCLK_U
CSB_U
IO_UPDATE_U
IP3_U
P2_U
P1_U
P0_U
R71
GND
SDIO_0
P1
P3
P5
P7
P9
P11
P13
P15
P17
P19
P21
P23
P25
U2
2
4
6
8
10
12
14
16
18
20
22
24
26
P2
P4
P6
P8
P10
P12
P14
P16
P18
P20
P22
P24
P26
R67
R66
R29
R65
GND
GND
GND
GND
1kΩ
1kΩ
1kΩ
1kΩ
1kΩ
P0
P1
P2
P3
IO_UPDATE
CSB
SCLK
RESET
PWR_DWN
SDIO_3
1kΩ
SDIO_2
1kΩ
SDIO_1
1kΩ
R68
R69
R70
GND
GND
GND
1
3
5
7
9
11
13
15
17
19
21
23
25
P1
P3
P5
P7
P9
P11
P13
P15
P17
P19
P21
P23
P25
2
4
6
8
10
12
14
16
18
20
22
24
26
P2
P4
P6
P8
P10
P12
P14
P16
P18
P20
P22
P24
P26
GND
I/O BUFFERS
GND
R13
50Ω
P3_U
P2_U
P1_U
P0_U
U12
1
3
2
RURD_0_U
RURD_1_U
RURD_2_U
74LVC32A
I/O_UPDATE_U
USB_STATUS
1
4
R15
2
CR2
GND
GND
800Ω
RURD_0_U
RURD_1_U
RURD_2_U
GND
GND
C40
22pF
C39
22pF
x1
1
VCC_USB
GND
2
24MHz
VCC_USB
U7
VBUS
D–
USB_HDR
D+
GND
SHIELD0
SHIELD1
1
VBUS
2
3
4
5
6
GND
4
GND
VCC_USB
C92
4700pF
R20
1MΩ
R18
2.2kΩ
GND
GND
GND1 VCC_USB
GND
TP
GND
R19
2.2kΩ
VCC_USB
SDIO_0
SDIO_1
SDIO_2
SDIO_3
U8
1
2
3
NC1
VCC
NC2
NC3
VSS
NC4
SCL
SCA
8
7
6
PWR_DWN_U
RESET_U
SCLK_U
CSB_U
P3
P2
P1
P0
IO_UPDATE
RURD_0
RURD_1
RURD_2
15
16
17
18
CR1
VCC_USB
VCC_USB
GND
GND:10
11
12
13
14
1
19
W7
U6
VCC_USB:20
OE1
OE2
74LVC541A
9
Y7
A7
8
Y6
A6
7
Y5
A5
6
Y4
A4
5
Y3
A3
4
Y2
A2
3
Y1
A1
2
Y0
A0
GND:10
11
12
13
14
15
16
17
18
VCC_USB
W10
W1
W2
W4
RURD_0
RURD_1
SCLK
CSB
VCC_USB
PD4/FD12
PD3/FD11
PD2/FD10
PD1/FD9
PD5/FD13
PD6/FD14
PD7/FD15
GND1
CLKOUT
VCC1
3
4
5
6
7
8
GND2
ADY0/SLRD
RDY1/SLWR
AVCC
XTALOUT
XTALIN
AGND
9
10
11
12
13
14
15
PD0/FD8
WAKEUP
VCC7
RESET
GND6
PA7/FLAGD/SLC5
PA6/PKTEND
VCC2
DPLUS
DMINUS
GND3
VCC3
GND
IFCLK
16
17
18
19
20
21
22
RESERVED
SCL
SDA
VCC4
PB0/FD0
PB1/FD1
PB2/FD2
23
24
25
26
27
28
PA5/FIFOADR1
PA4/FIFOADR0
PA3/WU2
PA2/SLOE
PA1/INT1
PA0/INT0
VCC6
CTL2/FLAGC
CTL1/FLAGB
CTL0/FLAGA
GND5
VCC5
GND4
PB7/FD7
PB6/FD6
PB5/FD5
PB4/FD4
PB3/FD3
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
R12
100kΩ
IO_UPDATE_U
P3_U
P2_U
P1_U
C43
10µF
P0_U
GND
VCC_USB
VCC_USB
GND
R17
100kΩ
PWR_DWN_U
RESET_U
CSB _U
USB_STATUS
C41
1µF
GND
VCC_USB
SCLK_U
GND
VCC_USB
GND
CY7C68013
R14
2.2kΩ
W6
W9
24LC00
1
2
W3
5
PWR_DWN
RESET
U4
74LVC14A
R16
VBUS
OE1
OE2
74LVC541A
9
Y7
A7
8
Y6
A6
7
Y5
A5
6
Y4
A4
5
Y3
A3
4
Y2
A2
3
Y1
A1
2
Y0
A0
GND
300Ω
74LVC14A
VCC_USB
VCC_USB:20
USB I/O
U9
U9
U5
1
19
I/O UPDATE OUT
J15
PC_CTRL
PC_CTRL
I/O UPDATE IN
J14
3
GND
W5
GND
RURD_2
USB BYPASS CAPACITORS
VCC_USB
VCC_USB
C24
0.1µF
C25
0.1µF
C26
0.1µF
C27
0.1µF
C28
0.1µF
C29
0.1µF
C30
0.1µF
C31
0.1µF
C32
0.1µF
C33
0.1µF
C23
0.1µF
C59
0.1µF
C42
2.2µF
C61
0.1µF
GND
CLK_VDD
AVDD3
R36
0Ω
BG_VDD
R37
0Ω
R35
0Ω
R33
0Ω
R34
0Ω
AVDD0
R38
0Ω
R32
0Ω
R39
0Ω
R40
0Ω
R41
0Ω
R42
0Ω
R43
0Ω
BG_VDD
R44
0Ω
CLK_VDD
Figure 50. AD9958/PCB Schematic, Page 3
Rev. 0 | Page 26 of 28
R45
0Ω
R46
0Ω
R47
0Ω
R48
0Ω
R49
0Ω
05783-053
GND
AD9958/PCB
ORDERING INFORMATION
ORDERING GUIDE
Model
AD9958/PCB
Description
Evaluation Board
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 27 of 28
AD9958/PCB
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB05783-0-1/06(0)
Rev. 0 | Page 28 of 28