EVAL-ADF4112EB1

REV.PrA 04/00

–2–

Figure 1. Evaluation Board Silkscreen

Figure 2. PC Cable Diagram

1

2

3

7

8

9

11

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25

1

2

3

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9

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

6

4

5

Blue

Purple

Yellow

13

10

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

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 ADF4112,

passive loop filter (20kHz bandwidth) and the VCO 190-

836T 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 ADF4112.

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

836MHz RF output, 5mA CP current, VCO190-836T,

30kHz channel spacing and 3kHz loop bandwidth.