Analog Devices EV-ADF4108EBIZ User Manual page 4

UG-160
EVALUATION BOARD HARDWARE
The evaluation board comes with a mini-USB cable to connect to
the USB port of a PC. The evaluation board silkscreen is shown
in Figure 2. The EV-ADF4108EB1Z
Figure 21, Figure 22, Figure 23, and Figure 24.
POWER SUPPLIES
The board is powered via two external supplies, 5.5 V and 15 V,
and connected as described in the Quick Start Guide Section on
page 3.
INPUT SIGNALS
The necessary reference input can be from an external
generator. A low noise, high slew rate reference source is best
for achieving the stated performance of the ADF4108. This
reference source is connected to the SMA connector REFIN. A
second option is to solder a footprint-compatible TCXO to
Footprint Y1.
schematics are shown in
Figure 2. Evaluation Board Silkscreen
Rev. A | Page 4 of 20
Evaluation Board User Guide
OUTPUT SIGNALS
The VCO output is available at EXT_VCOOUT through a
standard SMA connector. A divide by 2 option is also available
at the SMA connector VCO/2. To use an alternate loop filter
and VCO, the charge pump output CPOUT and the VCO tune
voltage VTUNE are available as outputs via standard SMA
connectors.
DEFAULT OPERATION
All components necessary for LO generation can be inserted on
the board. The board is shipped with the
an active loop filter, and the VCO.
An active loop filter using standard feedback is inserted
between the charge pump output and the VCO input. The
design parameters for the loop filter are for a center frequency of
7500 MHz, a PFD frequency of 2500 kHz, and an active loop filter
bandwidth of 17 kHz. To design a filter for different frequency
setups, use the ADIsimPLL simulation software to generate
filter component values and evaluate results.
ADF4108 synthesizer,