Evaluation And Test - Analog Devices EVAL-ADF4151EB1Z User Manual

UG-369

EVALUATION AND TEST

To evaluate and test the performance of the ADF4151, use the
following procedure:
1. If using a different VCO and loop filter than provided on
the board, ensure that a VCO and loop filter are properly
inserted on the board. Use ADIsimPLL to generate the
loop filter component values.
2. Install the ADF4151software. Connect the evaluation
board to a PC using the supplied USB cable. Follow the
hardware driver installation procedure that appears.
3. If the on-board crystal oscillator is used, skip this step. If
an external reference is necessary, connect a reference
signal to the REFIN edge mount connector.
4. Connect the power supply to the board.
5. Connect a spectrum analyzer to Connector VCO_I/O.
6. Run the ADF4151 software.
7. In the software window, set the VCO center frequency
(Figure 20 shows a screenshot of a spectrum analyzer taken
at a frequency of 1750 MHz, which is in the middle range
of the provided VCO). Set the PFD frequency as defined in
ADIsimPLL, and program the reference frequency to 25
MHz if the on-board TCXO is used or to the frequency
that has been supplied to the REFIN connector. See Figure 21
for the suggested setup.
8. Measure the output spectrum. Figure 20 shows a
1750 MHz output.
PC
POWER
SUPPLIES
SIGNAL
GENERATOR
REFERENCE
(OPTIONAL)
USB
LOCK
DETECT
LED
PLL
POWER
LED
USB LED
Figure 21. Typical Evaluation Setup
Rev. A | Page 12 of 24
Evaluation Board User Guide
Ref 0 dBm * Att 5 dB
0
-10
1 AP
CLRWR
-20
-30
-40
-50
-60
-70
-80
-90
-100
Center 1.749996795 GHz 200 kHz/
Date: 14.DEC.2011 16:44:31
Figure 20. Spectrum Analyzer Display
TCXO
PLL
C21
R47 C13
R9
R59
C67 C14
R34
LOOP FILTER
VCO
*
RBW 20 kHz Marker 1 [T1 ]
VBW 50 kHz -5.28 dBm
SWT 20 ms 1.749996795 GHz
1
A
3DB
Span 2 MHz
SPECTRUM
ANALYZER