ANALOG DEVICES EVAL-ADF421XEB1 Service Manual

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Evaluation Board For PLL Frequency

a

FEATURES
General Purpose PLL Evaluation Board excluding Synthe-

sizer, VCOs, Loop Filters for generating generic PLL
standards.

Compatible with ADF4210 and ADF4216 synthesizer fami-

lies.

Accompanying Software allows complete control of syn-

thesizer functions from PC

Battery Operated: Choice of 3V or 5V supplies

BLOCK DIAGRAM

Synthesizer

EV AL-ADF421XEB1

GENERAL DESCRIPTION

This board is designed to allow the user to evaluate
the performance of the ADF421X Frequency Synthe­sizer for PLL's (Phase Locked Loops). The block
diagram of the board is shown below. It contains the
footprint for a ADF421X 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 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 software to allow
easy programming of the synthesizer.

RF

V

V

DD

VCO

OUT

VCO 1

(Va ri -L )

VCO 190-XXXT

SMA

Socket

EVAL-ADF411XEB1

PC CONNECTOR

9V BATTERY

POWER SWITCH

ON OFF

ADF4 11X

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 02/00

© Analog Devices, Inc., 1999

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] Fax: [phone]

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-ADF421XEB1

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

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.

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 ADF4113 V
supply. The default settings are 3V for the ADF411X V

and VP, and for the VCO

DD

DD

and 5V for the ADF411X VP and for the VCO supply. It

is very important to note that the ADF4113 V
never exceed the ADF411X 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 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

–2–

REV.PrA 02/00