EVAL-ADF4208EB1 Datasheet, PDF (2/6 Pages) Analog Devices – Evaluation Board For PLL Frequency Synthesizer

Hardware Description
The evaluation board comes with a cable for connecting to
the printer port of a PC. The silk screen and cable diagram for
the evaluation board are shown below. The board
schematic is shown on pages 3 and 4.
EVAL-ADF4208EB1
EVAL-ADF411X
EVAL-ADF421X
61
72
83
94
5
9 Way
Female D-Type
To
ADF411X
ADF421X
Evaluation
Board
1
Black - CLK 2
14
Brown - DATA ₃
15
Red - LE ₄
16
Orange - CE ₅
17
PC
White - GND
Yellow 6
18
19
7
20
8
21
9
Blue 10 ²²
23
11
24
12
Purple ₁₃
25
25 Way Male
D-Type
To
PC Printer Port
Figure 2. PC Cable Diagram
connectors. If the user wishes they may use their own
power supplies and use the reference output. In this case,
they need to insert SMA connectors to as shown on the
silkscreen and block diagram.
The AD7706 A/D converter is used to monitor the power
supply voltage and current consumption of the ADF4208.
This helps the user pick the optimum synthesizer settings for
power consumption and also provides an alert if the battery
voltage is too low to sustain the required 3V or 5V for the
board supply.
Figure 1. Evaluation Board Silkscreen
The board is powered from a single 9V battery. The
power supply ciruitry allows the user to choose either 3V
or 5V for the ADF4208 V_DD and V_P, and for the VCO
supply. The default settings are 3V for the ADF4208 V_DD
and 5V for the ADF4208 V_P and for the VCO supply. It
is very important to note that the ADF4208 V_DD should
never exceed the ADF4208 V_P. This can damage the de-
vice.
All components necessary for LO generation are catered
for on-board. The crystal oscillator circuit provides the
necessary 10MHz reference frequency. The addition of an
SMA connector allows an external reference to be used
(Please consult circuit diagram to see what components
are needed to be added or removed for this). The PLL
requires a loop filter and VCO for both the IF and RF
sides to complete the dual PLL. The output is available
at RF OUT and IF OUT through standard SMA
–2–
REV.PrA 02/00