Analog Devices ADF4118EB1 Datasheet

WCDMA Evaluation Board For PLL

a

FEATURES
Self-Contained Board including Synthesizer, VCO and

Loop Filter for generating WCDMA frequencies

(1.93GHz to 1.99GHz)
Designed for 20kHz Loop Bandwidth
Accompanying Software allows complete control of syn-

thesizer functions from PC
Battery Operated: Choice of 3V or 5V supplies
Typical Phase Noise Performance of -85dBc/Hz @ 1kHz

offset

BLOCK DIAGRAM

Frequency Synthesizer

EV AL-ADF4118EB1

GENERAL DESCRIPTION

This board is designed to allow the user to evaluate
the performance of the ADF4118 Frequency Synthe­sizer for PLL's (Phase Locked Loops). The block
diagram of the board is shown below. It contains the
ADF4118 synthesizer, a pc connector, TCXO for the
reference input, SMA connectors for the power sup­plies and RF output. There is also a low pass loop
filter (20kHz) and a VCO (Vari-L VCO190-1960T)
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

(Vari-L)

VCO 190-XXXT

SMA

Socket

EVAL-ADF411XEB1

PC CONNECTOR

9V BATTERY

POWER SWITCH

ON OFF

ADF411X

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.PrB

© Analog Devices, Inc., 1999

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

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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.

EV AL-ADF4118EB1

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 1.96GHz RF output, 1mA CP current, VCO190­1960T, 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 ADF4118 V
supply. The default settings are 3V for the ADF4118 V

and VP, and for the VCO

DD

DD

and 5V for the ADF4118 VP and for the VCO supply. It

is very important to note that the ADF4118 V
never exceed the ADF4118 V

. This can damage the de-

P

should

DD

vice.

All components necessary for LO generation are catered
for on-board. The 10MHz TCXO from Vectron provides
the necessary Reference Input. The PLL is made up of
the ADF4118, passive loop filter (20kHz) and the VCO
190-1960T 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 ADF4118.
This helps the user pick the optimum synthesizer settings for
power consumption and also provides an alert if the battery

–2–

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