ANALOG DEVICES EVAL-ADF4208EB1 Service Manual
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Evaluation Board For PLL Frequency
=
FEATURES
Evaluation Board featuring the ADF4208 synthesiser.
Requires only RF and IF VCO's and Loop Filters for dual
PLL.
Complete with SMA connectors, battery, and on board
10MHz Crystal.
Programmable via a serial interface.
Accompanying Software allows complete control of synthesizer
functions from PC using Windows 95/98/NT
Battery Operated: Choice of 3V or 5V supplies
On Board Monitoring of Current and Voltage.
BLOCK DIAGRAM
9V BATTERY
V
DD
9V BATTERY
Synthesizer
EV AL-ADF4208EB1
GENERAL DESCRIPTION
This board is designed to allow the user to evaluate
the performance of the ADF4208 Dual Frequency
Synthesizer for PLL's (Phase Locked Loops). The
block diagram of the board is shown below. It contains the ADF4208 synthesizer, a pc connector, and
SMA connections for refererence input, power
supplies and RF and IF output. The board only
requires an RF VCO and loop filter and an IF VCO
and loop filter. A cable is included with the board to
connect to a pc printer port.
The package also contains windows software to allow
easy programming of the synthesizer.
V
VCO
VCO1
VTUN
VCO1
FOUT
RF
OUT
REF
IN
VCO 1
No t Pop u la te d
SMA
Socket
10 MHz Crystal
EVAL-ADF4208EB1
PC CONNECTOR
PC CONNECTOR
POWER SW ITCH
ON OFF
ADF4208
No t Pop u la ted
AD7706
AD7706
VCO 2
SMA
Socket
V
P
VCO2
VTUN
VCO2
FOUT
IF
RSET
OUT
REV.PrA 02/00
Information furnished by Analog Devices is believed to be accurate and reliable. However,
no responsibility is assumed by Analog Devices for its use, nor for any infringements of
patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1999
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781-329-4700 Fax: 781-326-8703
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.
EV AL-ADF4208EB1
EVAL-ADF411X
EVAL-ADF421X
1
6
2
7
3
8
4
9
5
9 Way
Female D-Type
To
ADF411X
ADF421X
Evaluation
Board
Brown - DATA
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.
Black - CLK
Red - LE
Orange - CE
White - GND
Yellow
Purple
1
2
3
4
5
6
7
8
9
10
Blue
11
12
13
25 Way Male
D-Type
To
PC Printer Port
14
15
16
17
18
19
20
21
22
23
24
25
PC
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
supply. The default settings are 3V for the ADF4208 V
and VP, and for the VCO
DD
DD
and 5V for the ADF4208 VP and for the VCO supply. It
is very important to note that the ADF4208 V
never exceed the ADF4208 V
. This can damage the de-
P
should
DD
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
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