Analog Devices ADF4212EB1 Datasheet
Evaluation Board For PLL Frequency
a
FEATURES
Self Contained Evaluation Board including Synthesizer,
VCOs, Loop Filters for generating GSM 1800 standards
(1700MHz to 1800MHz RF, 520MHz to 560MHz IF).
RF and IF filters designed for 20kHz Loop Bandwidth, and
200kHz Channel Spacing.
Accompanying Software allows complete control of syn-
thesizer functions from PC using Windows 95/98/NT.
Battery Operated: Choice of 3V or 5V supplies
On-Board Monitoring of Voltage and Current
Typical RF Phase Noise Performance of -84dBc/Hz @1kHz
offset.
Typical IF Phase Noise Performance of -90dBc/Hz @1kHz
offset.
Typical Spurious Performance of batter than -80dBc
@200kHz offset.
BLOCK DIAGRAM
Synthesizer
EV AL-ADF4212EB1
GENERAL DESCRIPTION
This board is designed to allow the user to evaluate
the performance of the ADF4212 Frequency Synthesizer for PLL's (Phase Locked Loops). The block
diagram of the board is shown below. It contains the
footprint for a ADF4212 synthesizer, a pc connector,
SMA connector for the reference input, power supplies and RF output. There is also a loop filter and a
VCO for both the RF and IF section on board. A
cable is included with the board to connect to a pc
printer port.
The package also contains Windows 95/98/NT software to allow easy programming of the synthesizer.
V
RF
REF
V
DD
VCO
OUT
IN
VCO 1
(Vari -L )
VCO 190-XXXT
SMA
Socket
TCXO
Vectron
EVAL -ADF42 1XE B1
PC CO NNECTO R
9V BA TTER Y
POWER SWITCH
ON OFF
ADF421X
VCO 190-XXXT
VCO 1
(Vari -L )
AD7706
SMA
Socket
V
P
IF
OUT
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 0 11/00
© 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-ADF4212EB1
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
The AD7706 A/D converter is used to monitor the power
supply voltage and current consumption of the ADF4212.
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 ADF4212 V
supply. The default settings are 3V for the ADF4212 V
and VP, and for the VCO
DD
DD
and 5V for the ADF4212 VP and for the VCO supply. It
is very important to note that the ADF4212 V
never exceed the ADF4212 V
. This can damage the de-
P
should
DD
vice.
All components necessary for LO generation are catered
for on-board. The TCXO connector provides the necessary Reference Input. The RF PLL is made up of the
ADF4212, passive loop filter and the VCO 190-1750T
from Vari-L. The output is available at RFOUT through
a standard SMA connector. The IF PLL is made up of the
ADF4212, passive loop filter and the VCO 190-540T
from Vari-L. The output is available at IFOUT 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.
–2–
REV 0 11/00
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