Evaluation Board Hardware; Power Supplies; Deleted Test Setup Section And Figure 4; Changes To Evaluation Board Hardware Section - Analog Devices EV-ADF4156SD1Z User Manual

UG-171

EVALUATION BOARD HARDWARE

The evaluation board requires the use of an SDP-S mother-
board to program the device. This is not included and must be
purchased separately. The
shown in Figure 21 to Figure 23.

POWER SUPPLIES

The board is powered from external banana connectors. The
voltage can vary between 6 V and 12 V. The power supply
circuit provides 3.0 V to V
ADF4156 AV and DV
DD
either 3.0 V or 5 V for the
3.0 V for the ADF4156
that V should never exceed 3.3 V. This can damage the device.
DD
External power supplies can be used to directly drive the device.
In this case, the user must insert SMA connectors as shown in
Figure 2.

INPUT SIGNALS

The necessary reference input comes from the on-board TCXO.
Alternatively, this can be sourced from an external generator. A
low noise, high slew rate reference source is best for achieving
the stated performance of the ADF4156. This can be connected
to Connector J11. If preferred, the edge mount connector, J5,
can be inserted and used instead. To use this option, it is
necessary to remove R16 and insert a 51 Ω resistor in R17.
Digital SPI signals are supplied through the SDP connector, J1.
SDP-S is the preferred platform to be used. The SDP-B can also
be used but Resistor R57 must be removed on the SDP-B board.
Some additional low frequency spurious may appear if the SDP-B
connector is used.
Downloaded from Elcodis.com electronic components distributor
EV-ADF4156SD1Z schematics are
on the board (which supplies the
DD
pins) and allows the user to choose
DD
ADF4156 V . The default settings are
P
V and 5 V for the ADF4156 V
DD
. Note
P

OUTPUT SIGNALS

All components necessary for LO generation are on board. The
PLL is made up of the
and the VCO. A 5.8 GHz VCO from Z-Comm is supplied with
the evaluation board. A 20 kHz low-pass filter is inserted
between the charge pump output and the VCO input. The
0.31 mA charge pump current setting is used. The VCO output
is available at RFOUT through a standard SMA connector, J2.
The MUXOUT signal can be monitored at Test Point T8 or at
SMA Connector J3.
Rev. B | Page 4 of 24
Evaluation Board User Guide
Figure 2. Evaluation Board Silkscreen
ADF4156 synthesizer, a passive loop filter,