ANALOG DEVICES UG-110 Service Manual
Evaluation Board User Guide
UG-110
One Technology Way • P. O . Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel : 781.329.4700 • Fax : 781.461.3113 • www.analog.com
Evaluation Board for Fractional-N/Integer-N PLL Frequency Synthesizer
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
EVALUATION BOARD BLOCK DIAGRAM
the ADF4350 synthesizer, a USB connector and related interface, 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 XPcompatible) to allow easy programming of the synthesizer.
EVALUATION KIT CONTENTS
Evaluation board software CD
USB cable
EVAL-ADF4350EB2Z
USB
CONNECTOR
EXTERNAL DC
SUPPLY
EXTERNAL DC
GND
USB
POWER
LED
EXTERNAL POWER
SWITCH
USB POWER SWITCH
USB CRYSTAL
AND PROCESSOR
HEADERS
LOCK DETECT LED
TCXO
REFERENCEIN/OUT
Figure 1.
HEADERS
ADF4350
LOOP FILTER
PLL
POWER
LED
RF
B−
OUT
RF
B+
OUT
RF
A–
OUT
RF
A+
OUT
08909-001
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 12
UG-110 Evaluation Board User Guide
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
REVISION HISTORY
3/10—Revision 0: Initial Version
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
Rev. 0 | Page 2 of 12
Evaluation Board User Guide UG-110
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 connectors). 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.
C13
C14
R11
C12
R9C15
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.
Rev. 0 | Page 3 of 12
UG-110 Evaluation Board User Guide
EVALUATION SETUP
OSCILLOSCOPE
EXTERNAL DC
SUPPLY
EXTERNAL DC
GND
EXTERNAL POWER
SWITCH
USB POWER SWITCH
USB CRYSTAL
AND PROCESSOR
HEADERS
HEADERS
LOCK DETECT LED
PLL
POWER
LED
(OPTIONAL)
SPECTRUM ANALYZ ER
ADF4350
PC
USB
POWER
LED
LOOP FILTER
TCXO
REFERENCEIN/OUT
50Ω
TERMINATION
(OPTIONAL)
08909-007
Figure 3. Evaluation Setup
Rev. 0 | Page 4 of 12
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