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EVAL-ADF4113EB1 Datasheet(Fiches technique) 2 Page - Analog Devices

Numéro de pièce EVAL-ADF4113EB1
Description  GSM900 Evaluation Board For PLL Frequency Synthesizer
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EVAL-ADF4113EB1
REV.PrB 04/00
–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
25 Way Male
D-Type
To
PC Printer Port
9 Way
Female D-Type
To
ADF411X
ADF421X
Evaluation
Board
PC
EVAL-ADF411X
EVAL-ADF421X
White - GND
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5
Blue
Purple
Yellow
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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.
The board is powered from a single 9V battery. The power
supply ciruitry allows the user to choose either 3V or 5V for
the ADF4113 VDD and VP, and for the VCO supply. The
default settings are 3V for the ADF4113 VDD and 5V for the
ADF4113 VP and for the VCO supply. It is very important
to note that the ADF4113 VDD should never exceed the
ADF4113 VP. This can damage the device.
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 ADF4113,
passive loop filter (20kHz bandwidth) and the VCO 190-902
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 ADF4113.
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.
Loop component values shown in the circuit diagram are for
900MHz RF output, 5mA CP current, VCO190-902T,
200kHz channel spacing and 20kHz loop bandwidth.




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