EVAL-ADF4350EB1Z Analog Devices Inc, EVAL-ADF4350EB1Z Datasheet - Page 3

• Manufacturer Part Number: EVAL-ADF4350EB1Z
• Description: Evaluation Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADF4350EB1Z

• Design Resources: Broadband Low EVM Direct Conversion Transmitter Using LO Divide-by-2 Modulator (CN0144)
• Silicon Core Number: ADF4350
• Kit Application Type: Clock & Timing
• Application Sub Type: Voltage Controlled Oscillator
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4437453; Q4841122; Q5095480; Q5242312; Q5416250

Evaluation Board User Guide
EVALUATION BOARD HARDWARE
OVERVIEW
The EVAL-ADF4350EB1Z 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-ADF4350EB1Z 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 5.5 V is
a suitable feeding voltage. The power supply circuitry allows
the user to use one or two separate LDOs to feed the
(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 setting.
An LED, D6, indicates when USB power is available, and
another LED, D5, indicates when the ADF4350 is powered.
Switch S1 is used to power the ADF4350 from the external
dc connectors USB port and Switch S2 to power from the
USB port.
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.
ADF4350
Rev. 0 | Page 3 of 12
RF OUTPUT
The EVAL-ADF4350EB1Z has two SMA output connectors
(differential outputs). The device is quite sensitive to impedance
unbalance. If only one port of a differential pair is used, termi-
nate the other with a 50 Ω load. If the user wishes to utilize the
auxiliary outputs, use the EVAL-ADF4350EB2Z.
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.
REFERENCE SOURCE
The 25 MHz TCXO from Rakon Limited 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.
R9 can be populated with 50 Ω to adjust impedance matching
of the evaluation board to the external reference source.
Figure 2. Loop Filter Placement
UG-109