Analog Devices AD9284-250EBZ User manual

AD9284-250EBZ User Guide
UG-178
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD9284 Analog-to-Digital Converter
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.Rev. A | Page 1 of 24
FEATURES
Full featured evaluation board for the AD9284
SPI interface for setup and control
Support LVDS output mode option
External or on-board oscillator options
Balun/transformer or amplifier input drive options
Switching power supply
VisualAnalog™ and SPIController software interfaces
EQUIPMENT NEEDED
Analog signal source and antialiasing filter
Sample clock source (if not using the on-board oscillator)
Two switching power supplies (6.0 V, 2.5 A),
CUI EPS060250UH-PHP-SZ, provided
PC running 32-bit Windows® XP, Window Vista, or Windows 7
USB 2.0 port, recommended (USB 1.1-compatible)
AD9284 evaluation board
HSC-ADC-EVALCZ FPGA-based data capture kit
SOFTWARE NEEDED
VisualAnalog
SPIController
DOCUMENTS NEEDED
AD9284 data sheet
HSC-ADC-EVALCZ data sheet
AN-905 Application Note, VisualAnalog Converter Evaluation
Tool Version 1.0 User Manual
AN-878 Application Note, High Speed ADC SPI Control Software
AN-877 Application Note, Interfacing to High Speed ADCs via SPI
AN-835 Application Note, Understanding High Speed ADC
Testing and Evaluation
GENERAL DESCRIPTION
This user guide describes the AD9284 evaluation board,
which provides all of the support circuitry required to operate
the AD9284 in its various modes and configurations. The
application software used to interface with the device is also
described.
The AD9284 data sheet provides additional information and
should be consulted when using the evaluation board. All
documents and software tools are available at the FIFO page.
For additional information or questions, send an email to
[e-mail].
TYPICAL MEASUREMENT SETUP
09228-001
9284EE01
REV A
AD9284
9284EE02AHSC-ADC-EVALCZ
Figure 1. AD9284 Evaluation Board and HSC-ADC-EVALCZ Data Capture Board

UG-178 AD9284-250EBZ User Guide
Rev. A | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Equipment Needed........................................................................... 1
Software Needed............................................................................... 1
Documents Needed.......................................................................... 1
General Description ......................................................................... 1
Typical Measurement Setup ............................................................ 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Power Supplies .............................................................................. 3
Input Signals...................................................................................3
Output Signals ...............................................................................3
Default Operation and Jumper Selection Settings....................4
Evaluation Board Software Quick Start Procedures.....................5
Configuring the Board .................................................................5
Using the Software for Testing.....................................................5
Evaluation Board Schematics and Artwork...................................9
Ordering Information.................................................................... 22
Bill of Materials........................................................................... 22
REVISION HISTORY
6/14—Rev. 0 to Rev. A
Changes to Figure 13........................................................................ 9
Changes to Figure 14...................................................................... 10
Changes to Figure 15...................................................................... 11
Changes to Figure 16...................................................................... 12
Changes to Figure 17...................................................................... 13
Changes to Figure 18...................................................................... 14
Changes to Figure 19...................................................................... 15
5/11—Revision 0: Initial Version

AD9284-250EBZ User Guide UG-178
Rev. A | Page 3 of 24
EVALUATION BOARD HARDWARE
The AD9284 evaluation board provides all of the support
circuitry required to operate the AD9284 in its various modes
and configurations. Figure 2 shows the typical bench charac-
terization setup used to evaluate the ac performance of the
AD9284. It is critical that the signal sources used for the analog
input and clock have very low phase noise (<1 ps rms jitter) to
realize the optimum performance of the signal chain. Proper
filtering of the analog input signal to remove harmonics and
lower the integrated or broadband noise at the input is necessary
to achieve the specified noise performance.
See the Evaluation Board Software Quick Start Procedures
section to get started, and see Figure 13 to Figure 25 for the
complete schematics and layout diagrams. These diagrams
demonstrate the routing and grounding techniques that
should be applied at the system level when designing
application boards using the AD9284.
POWER SUPPLIES
This evaluation board comes with a wall-mountable switching
power supply that provides a 6 V, 2 A maximum output. Connect
the supply to the rated 100 V ac to the 240 V ac wall outlet at
47 Hz to 63 Hz. The output from the supply is provided through
a 2.1 mm inner diameter jack that connects to the printed circuit
board (PCB) at J101. The 6 V supply is fused and conditioned
on the PCB before connecting to the low dropout linear regulators
(default configuration) that supply the proper bias to each of the
various sections on the board.
INPUT SIGNALS
When connecting the clock and analog source, use clean signal
generators with low phase noise, such as the Rohde & Schwarz SMA,
or HP8644B signal generators or an equivalent. Use a 1 m shielded,
RG-58, 50 Ω coaxial cable for connecting to the evaluation
board. Enter the desired frequency and amplitude (see the
specifications in the AD9284 data sheet). When connecting the
analog input source, a multipole, narrow-band, band-pass filter
with 50 Ω terminations is recommended. Analog Devices, Inc.,
uses TTE and K&L Microwave, Inc., band-pass filters. The
filters should be connected directly to the evaluation board.
If an external clock source is used, it should also be supplied
with a clean signal generator as previously specified. Typically,
most Analog Devices evaluation boards can accept ~2.8 V p-p or
13 dBm sine wave input for the clock.
OUTPUT SIGNALS
The default setup uses the Analog Devices high speed converter
evaluation platform (HSC-ADC-EVALCZ) for data capture.
6V DC
2A MAX
6V DC
2A MAX
SWITCHING
POWER
SUPPLY
SWITCHING
POWER
SUPPLY
WALL OUTLET
100V TO 240V AC
47Hz TO 63Hz
PC RUNNING
VisualAnalog
AND SPIController
USER SOFTWARE
SIGNALGENERATOR
CLOCK SOURCE
SIGNALGENERATOR
ANALOG FILTER
SIGNALGENERATOR
ANALOG FILTER
09228 -002
9284EE01
REVA
AD9284
9284EE02A HSC-ADC-EVALCZ
Figure 2. Evaluation Board Connection

UG-178 AD9284-250EBZ User Guide
Rev. A | Page 4 of 24
DEFAULT OPERATION AND JUMPER SELECTION
SETTINGS
This section explains the default and optional settings or modes
allowed on the AD9284 evaluation board.
Power Circuitry
Connect the switching power supply that is supplied in the
evaluation kit between a rated 100 V ac to 240 V ac wall outlet
at 47 Hz to 63 Hz and J101.
Analog Input
The A and B channel inputs on the evaluation board are set up as
simultaneous channel sampling using a single transformer (per
channel) analog input with a 50 Ω impedance. The default
analog input configuration supports analog input frequencies
of up to ~200 MHz. This input network is optimized to support
a wide frequency band. See the AD9284 data sheet for additional
information on the recommended networks for different input
frequency ranges. The nominal input drive level is 10.5 dBm to
achieve 1.5 V p-p full scale into 50 Ω. At higher input frequencies,
slightly higher input drive levels are required due to losses in the
front-end network.
VREF
The AD9284 operates with a fixed 1.0 V reference. This sets the
analog input span to 1.5 V p-p.
RBIAS
RBIAS has a default setting of 10 kΩ (R206) to ground and is
used to set the ADC core bias current. Note that using a resistor
value other than a 10 kΩ, 1% resistor for RBIAS may degrade
the performance of the device.
Clock Circuitry
The default clock input circuit on the AD9284 evaluation
board uses a simple transformer-coupled circuit using a high
bandwidth 1:1 impedance ratio transformer (T501) that adds a
very low amount of jitter to the clock path. The clock input is
50 Ω terminated and ac-coupled to handle single-ended sine wave
types of inputs. The transformer converts the single-ended input to
a differential signal that is clipped by CR501 before entering the
ADC clock inputs. The AD9284 board has on-chip circuitry to
distribute a single clock to both ADC channels.
Non-SPI Mode
For users who want to operate the DUT without using SPI,
remove the shorting jumpers on J302. This disconnects the
CSB, SCLK, and SDIO/PWDN pins from the SPI control bus,
allowing the DUT to operate in non-SPI mode. In this mode,
the SDIO/PWDN pin takes on an alternate function to enable
power down functionality.
To enable the power-down feature, add a shorting jumper across
J202 at Pin 2 and Pin 3 to connect the SDIO/PDWN pin to
DRVDD.

AD9284-250EBZ User Guide UG-178
Rev. A | Page 5 of 24
EVALUATION BOARD SOFTWARE QUICK START PROCEDURES
This section provides quick start procedures for using the AD9284
evaluation board. Both the default and optional settings are
described.
CONFIGURING THE BOARD
Before using the software for testing, configure the evaluation
board using the following steps:
1. Connect the evaluation board to the data capture board, as
shown in Figure 1 and Figure 2.
2. Connect one 6 V, 2.5 A switching power supply (such as
the CUI, Inc., EPS060250UH-PHP-SZ) to the AD9284
board.
3. Connect one 6 V, 2.5 A switching power supply (such
as the supplied CUI EPS060250UH-PHP-SZ) to the
HSC-ADC-EVALCZ board.
4. Connect the HSC-ADC-EVALCZ board to the PC with a
USB cable.
5. On the ADC evaluation board, confirm that six jumpers
are installed as described as follows:
•J103, Pin 2 and Pin 3 (clock with regulator)
•J104, Pin 2 and Pin 3 (amp with regulator)
•J105, Pin 2 and Pin 3 (DRVDD with regulator)
•J106, Pin 2 and Pin 3 (AVDD with regulator)
•J201, Pin 1 and Pin 2 (SCLK SPI)
•J202, Pin 1 and Pin 2 (SDIO SPI)
6. On the ADC evaluation board, use a clean signal generator
with low phase noise to provide an input signal to the desired
A and/or B channel(s). Use a 1 m, shielded, RG-58, 50 Ω
coaxial cable to connect the signal generator. For best results,
use a narrow-band band-pass filter with 50 Ω terminations
and an appropriate center frequency. (Analog Devices uses
TTE, Allen Avionics, and K&L band-pass filters.)
USING THE SOFTWARE FOR TESTING
Setting Up the ADC Data Capture
After configuring the board, set up the ADC data capture using
the following steps:
1. Open VisualAnalog on the connected PC. The appro-
priate part type should be listed in the status bar of the
VisualAnalog – New Canvas window. Select the template
that corresponds to the type of testing to be performed (see
Figure 3).
Note that once power is applied to the AD9284 evaluation
board, the device is powered down. To wake up the device,
the SDIO/PWDN pin must be pulled low. This occurs
automatically by VisualAnalog after you complete Step 1.
09228-003
Figure 3. VisualAnalog, New Canvas Window
2. After the template is selected, a message appears asking if
the default configuration can be used to program the FPGA
(see Figure 4). Click Ye s to close the window.
09228-004
Figure 4. VisualAnalog Default Configuration Message
3. To change features to settings other than the default settings,
click the Expand Display button, located on the bottom
right corner of the window, to see what is shown in Figure 6.
Detailed instructions for changing the features and capture
settings can be found in the AN-905 Application Note,
VisualAnalog Converter Evaluation Tool Version 1.0 User
Manual. After the changes are made to the capture settings,
click the collapse display button (see the collapsed display
in Figure 5).
09228-005
Figure 5. VisualAnalog Window Toolbar, Collapsed Display

UG-178 AD9284-250EBZ User Guide
Rev. A | Page 6 of 24
09228-006
Figure 6. VisualAnalog Main Window

AD9284-250EBZ User Guide UG-178
Rev. A | Page 7 of 24
Setting Up the SPIController Software
After the ADC data capture board setup is complete, set up
the SPIController software using the following procedure:
1. Open the SPIController software by selecting Start >
SPIController or by double-clicking the SPIController
software desktop icon.
If prompted for a configuration file, select the appropriate one.
If not, check the title bar of the window to determine
which configuration is loaded. If necessary, choose
Cfg Open from the File menu and select the appropriate
file based on your part type. Note that the CHIP ID(1)
field should be filled to indicate whether the correct
SPIController configuration file is loaded (see Figure 7).
09228-007
Figure 7. SPIController, CHIP ID(1) Box
2. Click the New DUT button in the SPIController window (see
Figure 8).
09228-008
Figure 8. SPIController, New DUT Button
3. In the ADCBase 0 tab of the SPIController window, you can
access all global register settings (see Figure 9). See the AD9284
data sheet; the AN-878 Application Note, High Speed ADC SPI
Control Software; and the AN-877 Application Note, Interfacing
to High Speed ADCs via SPI, for additional information.
09228-009
Figure 9. SPIController, ADC Base0
4. Note that other settings can be changed on the ADCBase 0
page (see Figure 9) and the ADC A and ADC B pages (see
Figure 10) to set up the part in the desired mode. The ADCBase 0
page settings affect the entire part, whereas the settings on the
ADC A and ADC B pages affect the selected channel only. See
the AD9284 data sheet; the AN-878 Application Note, High
Speed ADC SPI Control Software; and the AN-877 Application
Note, Interfacing to High Speed ADCs via SPI, for additional
information on the available settings.
09228-010
Figure 10. SPIController, ADC A Page

UG-178 AD9284-250EBZ User Guide
Rev. A | Page 8 of 24
5. Click the Run button in the VisualAnalog toolbar (see
Figure 11).
09228-011
Figure 11. Run Button in VisualAnalog Toolbar, Collapsed Display
Adjusting the Amplitude of the Input Signal
The next step is to adjust the amplitude of the input signal for
each channel as follows:
1. Adjust the amplitude of the input signal so that the funda-
mental is at the desired level (examine the Fund Power
reading in the left panel of the VisualAnalog Graph - AD9284
FFT window). See Figure 12.
09228-012
Figure 12. Graph Window of VisualAnalog
2. Repeat this procedure for Channel B.
3. Click the disk icon within the Graph window to save the
performance plot data as a .csv formatted file.
Troubleshooting Tips
If the FFT plot appears abnormal, do the following:
•If you see a normal noise floor when you disconnect the
signal generator from the analog input, be sure you are not
overdriving the ADC. Reduce the input level, if necessary.
•In VisualAnalog, click the Settings button in the Input
Formatter block. Check that Number Format is set to the
correct encoding (offset binary by default). Repeat for the
other channel.
If the FFT appears normal but the performance is poor, check
the following:
•Make sure an appropriate filter is used on the analog input.
•Make sure the signal generators for the clock and the
analog input are clean (low phase noise).
•Change the analog input frequency slightly if noncoherent
sampling is being used.
•Make sure the SPI configuration file matches the product
being evaluated.
If the FFT window remains blank after Run is clicked, do the
following:
•Make sure the evaluation board is securely connected to
the HSC-ADC-EVALCZ board.
•Make sure the FPGA has been programmed by verifying
that the DONE LED is illuminated on the HSC-ADC-
EVALCZ board. If this LED is not illuminated, make sure
the U4 switch on the HSC-ADC-EVALCZ board is in the
correct position for USB configuration.
•Make sure the correct FPGA program was installed by
selecting the Settings button in the ADC Data Capture
block in VisualAnalog. Then select the FPGA tab and
verify that the proper FPGA bin file is selected for the part.
If VisualAnalog indicates that the FIFO Capture timed out,
do the following:
•Make sure all power and USB connections are secure.
•Probe the DCOA signal at RN601 on the evaluation board
and confirm that a clock signal is present at the ADC
sampling rate.

AD9284-250EBZ User Guide UG-178
Rev. A | Page 9 of 24
EVALUATION BOARD SCHEMATICS AND ARTWORK
09228-013
SUPPLY REGULATORS
POWER SUPPLY INPUT
VARIABLE POWER SUPPLY INPUT
3.3V
GND
DVDD (1.8V)
GND
AVDD (1.8V)
GND
1UF 1UF 1UF 1UF
10UF 10UF
10UF10UF
10UF 10UF
10UF10UF
10UF10UF
10UF
10UF
10UF 10UF
LTST-C190GKT
ADP2108AUJZ-3.3-R7
SPI_DVDD
REF_AVDD
DRVDD_REG AVDD_REG
3.3V_AMPVDD_REG
DRVDD
AVDD
3.3V_AMPVDD
3.3V_CLK_REG
BNX016-01
RAPC722X
100NH 100NH
0.1UF
VIN
VIN
1UF 1UF
S2A-TP
BLK BLK
S2A-TP
2.2UH 2.2UH
0.1UF
3.3V_CLK
0.1UF
Z5.530.3625.0
ADP2108AUJZ-1.8-R7
1.6A
3.3V_CLK_REG
39OHM
3.3V_AMPVDD_REG
39OHM
AVDD_BENCH
39OHM
DRVDD_BENCH
39OHM
39OHM 39OHM
AVDD_REG
39OHM
DRVDD_REG
39OHM
300
0 0
100K 100K
E102
1 2
E101
1 2
C101
F101
CR101
CA
FL101
R101
CR103
C
A
CR102
TP101
E112
1 2
E111
1 2
C125 C127
TP102
C129 C130
C128
E109
1 2
E110
1 2
C126
J102 1
2 3 4 5 6
R102C102 C103 C104
L101 L102
C105 C106 C107
C109
R103
E105
1 2
E107
1 2
C112 C114
C111
L104
C110
L103
U101
34
2
5
1
U102
34
2
5
1
C115 C117C116
C108 C113
J101
1 2
3
J103
1
2
3
J104
1
2
3
J105
1
2
3
J106
1
2
3
R104 R105
GND
GND GND
GND
GND GND
GND
GND
GND
GND
GND GND GND
GND
GND
GND GND
GND
GND
GND
GND
GND
SW
GND
FB
EN
VIN
SW
GND
FB
EN
VIN
GND GND
GND
GND GND
ALIAS
ALIAS
GND
GND
Figure 13. Board Power Input and Supply Circuits

UG-178 AD9284-250EBZ User Guide
Rev. A | Page 10 of 24
09228-014
AVDD PINS 48
DURINGLAYOUT CHECK IF WE CAN FIT 0402 ELSE 0201
DECOUPLINGCAPACITORS,ONE ON THE TOP AND ONE ON THE BOTTOM CLOSE TOTHE PINS
SHARE PADS
2-3 PWRDN MODE 1-2 SDIO MODE
AVDD PIN 1
NO CONNECT CMOS MODE (DEFAULT) 1-2 SCLK MODE
2-3 LVDS MODE
DEFAULT HIGH (EN) CONNECT OUTPUT DISABLED
DEFAULT LOW (DISABLED)
NOCONNECT(DEFAULT)
REFIN CKT
DRVDD PIN 20
DRVDD PIN 39
AVDD PINS 8 & 9 AVDD PIN 6
AVDD PINS 12 AVDD PINS 13
AVDD PINS 16
AVDD PINS 45
AVDD PIN 4
CONNECT CLKB ENABLED
AD9284
65/135/250 MSPS
AVDD
AVDD
ENC A+
SPI_CSB
SPI_SDIO/PWRDN
SPI_SCLK/CMOS_LVDS
DRGND
DRVDD
ENC A-
D6A(D7A-/D7B-)
AVDD AIN B-
AIN B+
AVDD AVDD REF IN AVDD CMVOUT AVDD AIN A+ AIN A- AVDD D5A/(D6A+ /D6B+)
D5B/(D2A+/D2B+)
D6B/(D3A-/D3B-)
D7B/(D3A+/D3B+)
DCOB/(DCO-)
DCOA/(DCO+)
D0A/(D4A-/D4B-)
D1A/(D4A+/D4B+)
D2A/(D5A-/D5B-)
D3A/(D5A+/D5B+)
OUTPUT_ENABLE
D4A/(D6A-/D6B-)
D7A(D7A+/D7B+)
D4B/(D2A-/D2B-)
D1B/(D0A+/D0B+)
D2B/(D1A-/D1B-)
D3B/(D1A+/D1B+)
CLOC K B ENABLE
D0B/(D0A-/D0B-)
RBIAS
DRGND
DRVDD
ENC B-
AVDD
AVDD
ENC B+
D7A_D7P
ADR512ARTZ-REEL7
AVDD
AVDD
AVDD
AVDD
AVDD
DRVDD
0.1UF
AVDD AVDD
DRVDD DRVDD
BLK
SDIO_DUT
DRVDD
SAMTECTSW10608GS3PIN
D0B_D0M D1B_D0P D2B_D1M D3B_D1P
D6A_D7M
SCLK_DUT_CMOS_LVDS
DRVDD
SCLK_DUT
SAMTECTSW10608GS3PIN
.1UF .1UF .1UF
.1UF .1UF .1UF .1UF
.1UF .1UF .1UF .1UF
.1UF
.1UF
.1UF .1UF
0.1UF
0.1UF
SDIO_DUT_PWRDN
AVDD
.1UF
.1UF .1UF
DNI
DNI
DNI DNI
DNI DNI DNI DNI
DNI
0.1UF
0.1UF
CMV_OUT
REF_AVDD
.1UF
AVDD
AVDD
.1UF
5K TSW-102-08-G-S
DRVDD
TSW-102-08-G-S
0
0
0
10K
10K
2.7K
RBIAS
J204
1 2
J203
1
2
U202
3
2 1
R201
R203
R202 R205 TP201
1
C207 C205
C203
C201
C209
C211
C215
C223
C204
C202
C206 C208
C210
C212 C214
C216
C218
C220C219 C222C221
C224
R204
1
2
3
J201
1 2 3
J202
1 2 3
C225
C226
C227
R206
37
38 39
40
41 42
43 44 45 46 47 48
PAD
20
21 22 23 24 19
15 16 17 18 14 13
1
2
3
4
5
6
7
8
9
10
11
12 25
26
27
28
29
30
31
32
33
34
35
36
SG-MLF-7006
U201
AVDD
AVDD
ENC_B+
ENC_B-
GND
DRVDD
D4B_D2M D5B_D2P D6B_D3M D7B_D3P
DCO_B
DCO_A D0A_D4M
D1A_D4P D2A_D5M D3A_D5P D4A_D6M D5A_D6P
DRVDD
GND
SCLK_DUT_CMOS_LVDS
SDIO_DUT_PWRDN
CSB_DUT
ENC_A-
ENC_A+
AVDD
AVDD
AVDD
AIN_A-
AIN_A+
AVDD AVDD
AVDD
AIN_B+
AIN_B-
AVDD
GND
GND
GND
GND
CW
GND GND
GND
GND
GND
GND
GND
GND
GND GND GND
GND
GND
GND
TRIM
V_N
V_P
GND
Figure 14. DUT and Related Circuits