Datasheet

Evaluation Board User Guide UG-160
Rev. B | Page 7 of 16
EVALUATION AND TEST
To evaluate and test the performance of the ADF4108, use the
following procedure:
1. Install the Analog Devices Int-N software (see the UG-476
user guide, PLL Software Installation Guide).
2. Use ADIsimPLL to generate the loop filter component
values if a different loop filter is required.
3. Solder new filter components specified by ADIsimPLL.
4. Install the USB software drivers. Connect the evaluation
board to a PC using the supplied USB cable. Follow the
hardware driver installation procedure that appears.
5. Connect the USB connector to the EV-ADF4108EB1Z.
6. Connect a reference signal to REFIN.
7. Connect a spectrum analyzer to EXT_VCOOUT or VCO/2.
8. Run the Int-N software.
9. Select the USB board and the ADF4108 device in the
Select Device and Connection tab of the main window of
the evaluation board software.
10. In the Main Controls tab in the main window of the
evaluation board software, set the VCO center frequency in
the RF VCO Output Frequency text box (the example in
Figure 5 uses a 6.4 GHz VCO). Set the PFD Frequency text
box as specified in ADIsimPLL, and program the Reference
Frequency value to equal the reference connected to the
REFIN SMA Connector (or the TCXO). See Figure 6 for
the suggested setup.
11. Measure the output spectrum. Figure 5 shows 6.4 GHz
phase noise output.
09145-019
R&S FSUP 26 Signal Source Analyzer
LOCKED
Settings Residual Noise [T1 w/o spurs]
Phase Detector +0 dB
Signal Frequency: 6.400000 GHz
Int PHN (1.0 k .. 30.0 M) –40.5 dBc
Signal Level:
–4.73 dBm
Residual PM
0.768 °
Cross Corr Mode Harmonic 1
Residual FM
1.86 kHz
Internal Ref Tuned
Internal Phase Det
RMS Jitter 0.3334 ps
Phase Noise [dBc/Hz] Marker 1 [T1] Marker 2 [T1]
RF Atten 5 dB 10 kHz 100 kHz
Top –70 dBc/Hz –82.78 dBc/Hz –111.06 dBc/Hz
–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
10kHz 100kHz 1MHz 10MHz1kHz 30MHz
–170
–160
–150
–140
–130
–120
–110
–100
–90
–80
LoopBW
Spur Pow er (dBc)
1 CLRWR
SMTH 1%
2 CLRWR
EXT
SPR OFF
TH 0dB
FREQUENCY OFFSET
1
2
Figure 5. Spectrum Analyzer Display