Analog Devices EVAL-ADF4350EB2Z User manual

Evaluation Board User Guide
UG-110
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluation Board for Fractional-N/Integer-N PLL Frequency Synthesizer
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12
FEATURES
Self-contained board including PLL, VCO, loop filter (20 kHz),
10 MHz TCXO reference, USB interface, and voltage
regulators
Accompanying software allows control of synthesizer
functions from a PC
Choice of power supply via USB or external feeding
Typical phase noise performance of −99 dBc/Hz @ 1 kHz
offset from carrier (1 GHz output frequency)
GENERAL DESCRIPTION
The EVAL-ADF4350EB2Z is designed to evaluate the
performance of the ADF4350 frequency synthesizer. A
block diagram of the board is shown in Figure 1. It contains
the ADF4350 synthesizer, a USB connector and related inter-
face, a 10 MHz TCXO reference source, SMA connectors for
the RF outputs, and reference signal plus headers for various
signals and voltages. There is also a loop filter (20 kHz) on
board. A USB cable is included with the board to connect to
a PC USB port.
The package also contains Windows® software (2000- and XP-
compatible) to allow easy programming of the synthesizer.
EVALUATION KIT CONTENTS
Evaluation board software CD
USB cable
EVAL-ADF4350EB2Z
EVALUATION BOARD BLOCK DIAGRAM
HEADERS
EXTERNAL DC
SUPPLY
EXTERNAL DC
GND
HEADERS
TCXO
ADF4350
LOOP FILTER
LOCK DETECT LED
USB
POWER
LED
PLL
POWER
LED
USB POWER SWITCH
EXTERNAL POWER
SWITCH
USB
CONNECTOR
USB CRYSTAL
AND PROCESSOR
REFERENCE IN/OUT
RF
OUT
A+
RF
OUT
A–
RF
OUT
B+
RF
OUT
B−
08909-001
Figure 1.

UG-110 Evaluation Board User Guide
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description......................................................................... 1
Evaluation Kit Contents................................................................... 1
Evaluation Board Block Diagram................................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
Overview........................................................................................ 3
Power Supplies .............................................................................. 3
RF Output.......................................................................................3
Loop Filter......................................................................................3
Reference Source ...........................................................................3
Evaluation Setup................................................................................4
Evaluation Board Software...............................................................5
Evaluation Board Schematics and Artwork...................................6
Ordering Information.................................................................... 10
Bill of Materials........................................................................... 10
REVISION HISTORY
3/10—Revision 0: Initial Version

Evaluation Board User Guide UG-110
Rev. 0 | Page 3 of 12
EVALUATION BOARD HARDWARE
OVERVIEW
The EVAL-ADF4350EB2Z comes with a cable for connecting to
the USB port of a PC. The silk screen for the evaluation board is
shown in Figure 8. The board schematic is shown in Figure 5,
Figure 6, and Figure 7.
POWER SUPPLIES
The EVAL-ADF4350EB2Z can be powered either from the
USB port or via dc power connectors (4 mm banana connec-
tors). When feeding via banana connectors, 3.75 V to 11 V is
a suitable feeding voltage. The power supply circuitry allows
the user to use one, two, or three separate LDOs to feed the
ADF4350 (using fewer LDOs increases the risk of spur
contaminated dc feeds). Consult the board schematic in
Figure 5, Figure 6, and Figure 7 to determine a suitable jumper
setting on Header J7.
An LED, D6, indicates when USB power is available, and
another LED, D5, indicates when the ADF4350 is powered.
Switch SW1 is used to power the ADF4350 from the USB port
and Switch SW2 is used to power the part from the external dc
connectors.
In case the USB processor or clock causes spurs on the RF
output signal, the user may feed the evaluation board via the
dc connectors and unplug the USB cable, thereby removing
power from the USB interface circuitry. There is also a
grounded frame surrounding the USB interface circuitry
to allow mounting of a shielding box.
The J8 to J13 connectors can be populated if the user wishes
to measure any spectral contamination on a specific dc voltage.
Otherwise, the voltages are also present on either Header J6 or
Header J7 for easy access and measurements.
RF OUTPUT
The EVAL-ADF4350EB2Z has four SMA output connectors
(dual differential output). The device is quite sensitive to
impedance unbalance. If only one port of a differential pair
is used, terminate the other with a 50 Ω load.
LOOP FILTER
The loop filter schematic is included in the board schematic on
Figure 5. The loop filter component placements are clarified in
Figure 2.
C14
R11
C12
R9C15
C13
08909-003
Figure 2. Loop Filter Placement
REFERENCE SOURCE
The 10 MHz TCXO from Fox Electronics provides the necessary
reference signal. An external REFIN may be used if desired. In
this case, disable the on-board TCXO by removing R1 and R2.
R3 can be populated with 50 Ω to adjust impedance matching
of the evaluation board to the external reference source.

UG-110 Evaluation Board User Guide
Rev. 0 | Page 4 of 12
EVALUATION SETUP
HEADERS
EXTERNAL DC
SUPPLY
EXTERNAL DC
GND
HEADERS
TCXO
ADF4350
LOOP FILTER
LOCK DETECT LED
USB
POWER
LED
PLL
POWER
LED
USB POWER SWITCH
EXTERNAL POWER
SWITCH
USB CRYSTAL
AND PROCESSOR
REFERENCE IN/OUT
SPECTRUM ANALYZER
50Ω
TERMINATION
PC
OSCILLOSCOPE
(OPTIONAL)
(OPTIONAL)
08909-007
Figure 3. Evaluation Setup

Evaluation Board User Guide UG-110
Rev. 0 | Page 5 of 12
EVALUATION BOARD SOFTWARE
The control software for the EVAL-ADF4350 accompanies the
EVAL-ADF4350EB2Z on a CD. To install the software, use the
following steps:
1. Click setup.exe.
2. The install wizard guides you through the installation
process. The software is installed in a default directory
called C:/Program Files/Analog Devices/ADF4350.
3. To run the software, click the .exe file.
The main interface window appears (see Figure 4). Confirm
that USB OK is displayed on the right side of the screen. Other-
wise, the software has no connection to the evaluation board.
It is also possible to disconnect the USB by clicking the
Disconnect USB button. Should this happen, no data is sent
to the part. This function is to be used before disconnecting
the board from the USB connection. When the board is
connected again, click the USB connect button to enable the
programming of the part. This ensures the PC does not freeze
up when the USB cable is disconnected.
Use the Reference section to set the correct reference frequency
and reference frequency divider. The reference TCXO on the
evaluation board runs at 10 MHz. To force the device to operate
in integer-N mode, set the R divider so that the PFD frequency
(displayed in the Settings section) equals the channel spacing
(set in the Output Frequency section) and select the Integer-N
when possible check box (in the Options section).
The Outputs section controls the charge pump current setting,
the output power setting, and the multiplexer output setting.
Use the Output Frequency section to control the output
frequency. You may specify two frequencies, and select which
one the device operates at. For some frequencies, the device can
operate in two modes: the low end of the VCO band or the high
end, plus an extra divide by two. To control which mode is used,
select Minimum Output Divider in the Options section.
The device can be set to toggle between the two set frequencies
by selecting Alternate in the Dynamic section. The time spent
on each frequency is set in the Approximate Delay field. To
stop, click Stop. It is also possible to sweep from f1 to f2 with
the channel spacing resolution with an approximate time delay
on each frequency.
It is also possible to select Low Spur Mode or Low Noise Mode
for the frac-N mode in the Options section. You can also set the
cycle slip reduction bit.
The Settings section displays selected settings. Click Registers to
display every bit of the register settings. To download these to
the device, click Update ALL.
08909-008
Figure 4. Software Front Panel

UG-110 Evaluation Board User Guide
Rev. 0 | Page 6 of 12
EVALUATION BOARD SCHEMATICS AND ARTWORK
08909-004
Figure 5. Evaluation Board Schematic (Page 1)

Evaluation Board User Guide UG-110
Rev. 0 | Page 7 of 12
08909-005
Figure 6. Evaluation Board Schematic (Page 2)

UG-110 Evaluation Board User Guide
Rev. 0 | Page 8 of 12
0
8909-006
Figure 7. Evaluation Board Schematic (Page 3)

Evaluation Board User Guide UG-110
Rev. 0 | Page 9 of 12
08909-002
Figure 8. Evaluation Board Silk Screen

UG-110 Evaluation Board User Guide
Rev. 0 | Page 10 of 12
ORDERING INFORMATION
BILL OF MATERIALS
Table 1.
Qty Reference Designator Description
21 C1, C4, C5, C8, C17, C18, C21, C22, C25, C29, C53,
C54, C55, C57, C60, C61, C62, C63, C64, C65, C66
Capacitor, 0.1 μF, 10%, 0402, 16 V, X7R
13 C2, C3, C6, C7, C10, C16, C19, C20, C23, C24, C28,
C52, C56
Capacitor, 10 pF, 5%, 0402, 50 V, NPO
9 C9, C33, C36, C38, C41, C43, C46, C48, C51 Capacitor+, 22 μF, 10%, TAJ_A, 6.3 V, tantalum
10 C11, C12, C26, C27, C30, C31, C34, C39, C44, C49 Capacitor, 1 nF, 10%, 0603, 50 V, X7R
1 C13 Capacitor, 1.5 nF, 10%, 0603, 50 V, X7R
3 C14, C58, C59 Capacitor, 22 nF, 10%, 0603, 50 V, X7R
1 C15 Capacitor, 680 pF, 10%, 0603, 50 V, X7R
8 C32, C35, C37, C40, C42, C45, C47, C50 Capacitor+, 1 μF, 10%, TAJ_A, 16 V, tantalum
1 D1 LED_CHIP, light emitting diode
2 D2, D3 SS16, DO-214AC, Schottky diode, −1 A, 60 V
1 D4 Zener-diode-S, 6.8 V, 5%, SOT23, OT23
2 D5, D6 LED, LED_CHIP, light emitting diode
5 J1, J2, J3, J4, J5 SMA, SMA_CARD_EDGE_RF
2 J6, J7 HEADER-7X2POL, HEADER14-POL
6 J8 to J13 DNI, SMA_CARD_EDGE_RF
1 J14 Red, 4 mm, banana socket
1 J15 Black, 4 mm, banana socket
1 J16 USB mini-B connector (usb-otg)
4 L1, L4, L5, L8 Inductor, 0 Ω, 1%, 0603
4 L2, L3, L6, L7 Inductor, 3.9 nH, 5%, 0603, Coilcraft 0603CS
14 R1, R2, R13, R32, R33, R34, R35, R36, R37, R47,
R51, R52, R56, R58
Resistor, 0 Ω, 1%, 0603
13 R3, R5, R6, R8, R11, R14, R18, R46, R48, R53,
R54, R55, R57
Resistor, DNI, 1%, 0603
1 R4 Resistor, 4.7 kΩ, 1%, 0603
2 R7, R38 Resistor, 1 kΩ, 1%, 0603
1 R9 Resistor, 820 Ω, 1%, 0603
1 R10 Resistor, 100 Ω, 1%, 0603
1 R12 Resistor, 330 Ω, 1%, 0603
4 R15, R16, R17, R19 Resistor, 10 kΩ, 1%, 0603
8 R20, R22, R24, R26, R28, R30, R40, R42 Resistor, 220 kΩ, 1%, 0603
4 R21, R25, R29, R41 Resistor, 390 kΩ, 1%, 0603
4 R23, R27, R31, R43 Resistor, 120 kΩ, 1%, 0603
3 R39, R49, R50 Resistor, 2.2 kΩ, 1%, 0603
2 R44, R45 Resistor, 100 kΩ, 1%, 0603
2 SW1, SW2 SW_POWER, SW_SIP-3P, NKK SPST N/O momentary push button switch
9 T1 to T9 Testpoint
1 U1 ADF4350, LFCSP-32 PLL
4 U2 to U5 ADP3334 MSO8 adjustable LDO regulator
1 U6 CY7C68013-CSP, LFCSP-56, USB microcontroller
1 U7 24LC64, SO8NB, 64K I2C serial EEPROM
1 Y1 OSC_TCXO, 10.0 MHz, OSC_TCXO, FOX
1 Y2 XTAL-CM309S, 24 MHz, XTAL_CM309S, CM309S SMD crystal