AD8369 datasheet(18/24 Pages) AD

18 / 24 page

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AD8369

Evaluation Board

The evaluation board allows for quick testing of the AD8369

using standard 50

W test equipment. The schematic is shown in

Figure 9. Transformers T1 and T2 are used to transform 50

source and load impedances to the desired 200

W reference level.

This allows for broadband operation of the device without the need

to pay close attention to impedance matching (see Table III).

Figure 10. Evaluation Board Layout

Evaluation Board Software

The evaluation board comes with the AD8369 control software

that allows for serial gain control from most computers. The

evaluation board is connected via a cable to the parallel port of

the computer. By simply adjusting the slider bar in the control

software, the gain code is automatically updated to the AD8369.

On some older PCs, it may be necessary to use 5 k

W pull-up

resistors to VPOS on DATA, CLOCK, and LATCH depending

upon the capabilities of the port transceiver.

It is necessary to set SW3 on the evaluation board to “SER” for

the control software to function normally.

A screen shot of the evaluation software interface is shown in

Figure 11.

Figure 11. Evaluation Software Interface

AD8369 Datasheet(PDF) 18 Page - Analog Devices