Evaluation Board Hardware; Power Supplies; Local Oscillator Components - Analog Devices EVAL-ADF4156EBZ1 User Manual

Evaluation Board User Guide

EVALUATION BOARD HARDWARE

The evaluation board comes with a cable for connecting to the
printer port of a PC (see Figure 2 for a PC cable diagram and
Figure 4 for a test setup configuration).
The evaluation board schematics are shown in Figure 6 and
Figure 7.

POWER SUPPLIES

The board is powered from a single 9 V battery. The power
cupply circuitry allows the user to choose 3 V for the ADF4156
V and either 3 V or 5 V for the ADF4156 V
DD
The default settings are 3 V for the ADF4156 V
the ADF4156 V and the VCO supply.
P
It is important to note that the ADF4156 V
exceed the ADF4156 V . This can cause damage to the device. If
P
desired, external power supplies can be used. In this case, the
user must insert SMA connectors as shown in Figure 3 and in
the block diagram (see Figure 1).
EVAL-ADF41xx
EVAL-ADF421x
1
6
2
7
3
8
4
9
5
WHITE-GND
9-WAY
FEMALE
D-TYPE
TO
ADF41xx
ADF421x
EVALUATION
BOARD
Figure 2. PC Cable Diagram
and VCO supply.
P
and 5 V for
DD
should never
DD
1
14
BLACK-CLK
2
15
BROWN-DATA
3
16
RED-LE
4
17
ORANGE-CE 5
PC
18
6
19
YELLOW
7
20
8
21
9
22
BLUE
10
23
11
24
12
25
PURPLE
13
25-WAY
MALE
D-TYPE
TO PC PRINTER PORT

LOCAL OSCILLATOR COMPONENTS

The 10 MHz TCXO provides the reference frequency. The on-
chip R divider should be set to 1 so that the PFD frequency is
also 10 MHz. The PLL is made up of the 10 MHz TCXO, the
ADF4156, a passive loop filter (20 kHz bandwidth), and the
V940ME03-LF VCO from Z-Communications, Inc. The output
is available at RF
The on-board loop filter has been designed for a charge pump
current of 0.3125 mA. ADIsimPLL™ can be used to design other
loop filters.
Rev. A | Page 3 of 8
through a standard SMA connector.
OUT
Figure 3. Evaluation Board Silkscreen
UG-171