ADF4351 datasheet(11/20 Pages) AD

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Evaluation Board User Guide

UG-435

Rev. 0 | Page 11 of 20

EVALUATION AND TEST

To evaluate and test the performance of the ADF4351, use the

following procedure:

1. Install ADF435x software.

2. Connect the evaluation board to a PC using the supplied

USB cable. Follow the hardware driver installation

procedure that appears.

3. Connect spectrum analyzer to Connector RFOUTA+.

4. Connect 50 Ω termination to RFOUTA−.

5. Run the ADF435x software.

6. Select the USB board and the ADF4351 device in the

Select Device and Connection tab of the software front

panel window.

7. In the software window, click Write All Registers. See

Figure 19 for the suggested setup.

8. Measure the output spectrum. Figure 20 shows a

phase noise plot at 2.5 GHz output.

9. Different combinations of reference and PFD frequency

may require changes to the REFIN stage or PFD frequency.

Low output frequencies may require different output stage

elements.

Figure 20. Spectrum Analyzer Display

Figure 21. Typical Evaluation Setup

SPECTRUM

ANALYZER

EXTERNAL DC

SUPPLY

EXTERNAL DC

GND

TCXO

ADF4351

LOOP

FILTER

LOCK DETECT LED

USB

POWER

LED

PLL

POWER

LED

USB

POWER

SWITCH

EXTERNAL

POWER

SWITCH

USB CRYSTAL

AND PROCESSOR

50Ω

TERMINATION

REFERENCE IN/

REFERENCE OUT

REFERENCE (OPTIONAL)

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