Analog Devices ADF4112EB1 Datasheet
CDMA Evaluation Board For PLL
=
FEATURES
Self-Contained Board including Synthesizer and VCO,
Loop Filter for generating CDMA frequencies (824MHz
to 849MHz)
Designed for 3kHz Loop Bandwidth
Accompanying Software allows complete control of synthe-
sizer functions from PC
Battery Operated: Choice of 3V or 5V supplies
Typical Phase Noise Performance of -81dBc/Hz @ 300 Hz
offset
Typical Spurious Performance of better than -81dBc at
30kHz offset from carrier
BLOCK DIAGRAM
Frequency Synthesizer
EV AL-ADF4112EB1
GENERAL DESCRIPTION
This board is designed to allow the user to evaluate the
performance of the ADF4112 Frequency Synthesizer for
PLL's (Phase Locked Loops). The block diagram of the
board is shown below. It contains the ADF4113 synthesizer, a pc connector, SMA connector for the reference
input, power supplies and RF output. There is also a
loop filter (3kHz bandwidth) and a VCO on board. 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.
RF
V
V
DD
VCO
OUT
VCO 1
(Vari-L)
VCO 190-836T
SMA
Socket
EVAL-ADF4112EB1
PC CONNECTOR
9V BATTERY
POWER SWITCH
ON OFF
ADF4112
TCXO
Vectron
AD7706
V
P
CE
REF
IN
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.
REV.PrA 04/00
© 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-ADF4112EB1
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
Loop component values shown in the circuit diagram are for
836MHz RF output, 5mA CP current, VCO190-836T,
30kHz channel spacing and 3kHz loop bandwidth.
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 ADF4112 V
default settings are 3V for the ADF4113 V
ADF4112 V
to note that the ADF4112 V
ADF4112 V
and VP, and for the VCO supply. The
DD
and for the VCO supply. It is very important
P
. This can damage the device.
P
should never exceed the
DD
and 5V for the
DD
All components necessary for LO generation are on-board.
The 13MHz TCXO from Vectron provides the necessary
Reference Input. The PLL is made up of the ADF4112,
passive loop filter (20kHz bandwidth) and the VCO 190836T from Vari-L. The output is available at RFOUT
through a standard SMA connector. If the user wishes they
may use their own power supplies and reference input. 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 ADF4112.
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.
–2–
REV.PrA 04/00
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