EVAL-ADF411XEB1
a Evaluation Board For PLL Frequency
Synthesizer
EVAL-ADF411XEB1
FEATURES
General Purpose PLL Evaluation Board excluding Synthesizer, VCO, Loop Filter for generating generic PLL standards.
Compatible with ADF4110 and ADF4116 synthesizer families.
Accompanying Software allows complete control of synthesizer functions from PC
Battery Operated: Choice of 3V or 5V supplies
GENERAL DESCRIPTION
This board is designed to allow the user to evaluate the performance of the ADF411X Frequency Synthesizer for PLL's (Phase Locked Loops). The block diagram of the board is shown below. It contains the footprint for a ADF411X synthesizer, a pc connector, SMA connector for the reference input, power supplies and RF output. There is also a footprint for a loop filter 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.
BLOCK DIAGRAM
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9V B ATTER Y |
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VD D |
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P O W E R S W ITCH |
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VV CO |
O N |
O FF |
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V |
P |
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V CO 1 |
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(V ari-L) |
C E |
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A DF4 11X |
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V CO 1 90-X X XT |
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R FO U T |
S M A |
R EFIN |
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S oc ke t |
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TCX O |
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V ectron |
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E VA L-A DF41 1X E B1 |
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A D7 706 |
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P C C O N NE CTO R |
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REV.PrB 04/00
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.
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 ADF4113 VDD and VP, and for the VCO supply. The default settings are 3V for the ADF411X VDD and 5V for the ADF411X VP and for the VCO supply. It is very important to note that the ADF4113 VDD should never exceed the ADF411X VP. This can damage the device.
All components necessary for LO generation are catered for on-board. The TCXO connector provides the necessary Reference Input. The PLL is made up of the ADF411X, passive loop filter and the VCO 190-XXXT 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 ADF411X. This helps the user pick the optimum synthesizer settings for power consumption and also provides an alert if the battery
EVAL-ADF411XEB1
EVAL-ADF411X
EVAL-ADF421X
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Black - CLK |
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Brown - DATA |
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Red - LE |
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Orange - CE |
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PC |
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White - GND |
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9 Way |
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Female D-Type |
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To |
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ADF411X |
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ADF421X |
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Evaluation |
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Board |
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Purple |
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25 Way Male
D-Type
To
PC Printer Port
Figure 2. PC Cable Diagram
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, VCO190902T, 200kHz channel spacing and 20kHz loop bandwidth.
–2– |
REV.PrB 04/00 |
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