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參數(shù)資料
| 型號： | EVAL-ADF421XEB1 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Evaluation Board For PLL Frequency Synthesizer |
| 中文描述： | 評估板鎖相環(huán)頻率合成器 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 247K |
| 代理商： | EVAL-ADF421XEB1 |
EVAL-ADF421XEB1
REV.PrA 02/00
–2–
Figure 1. Evaluation Board Silkscreen
Figure 2. PC Cable Diagram
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25
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Black - CLK
Brown - DATA
Red - LE
Orange - CE
WhiteYellow
25 Way Male
D-Type
To
PC Printer Port
9 Way
Female D-Type
To
ADF411X
ADF421X
Evaluation
Board
PC
EVAL-ADF411X
EVAL-ADF421X
6
4
5
Blue
Purple
13
H ardware D escription
T he evaluation board comes with a cable for connecting to
the printer port of a PC. T he silk screen and cable diagram for
the evaluation board are shown below. T he board schematic is
shown on pages 3 and 4.
T he board is powered from a single 9V battery. T he
power supply ciruitry allows the user to choose either 3V
or 5V for the ADF4113 V
DD
and V
P
, and for the VCO
supply. T he default settings are 3V for the ADF411X V
DD
and 5V for the ADF411X V
P
and for the VCO supply.
It
is very important to note that the ADF4113 V
D D
should
never exceed the ADF411X V
P
. T his can damage the de-
vice.
All components necessary for LO generation are catered
for on-board. T he T CX O connector provides the neces-
sary Reference Input. T he PLL is made up of the
ADF411X , passive loop filter and the VCO 190-X X X T
from Vari-L. T he 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.
T he AD7706 A/D converter is used to monitor the power
supply voltage and current consumption of the ADF411X .
T his 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.
Loop component values shown in the circuit diagram are
for 900MHz RF output, 5mA CP current, VCO190-
902T , 200kHz channel spacing and 20kHz loop band-
width.
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