AD9831

–13–

REV. A

AD9831 Evaluation Board

The AD9831 Evaluation Board allows designers to evaluate the

high performance AD9831 DDS Modulator with a minimum of

effort.

To prove that this device will meet the user’s waveform synthe-

sis requirements, the user only requires a 3.3 V or 5 V power

supply, an IBM-compatible PC and a spectrum analyzer along

with the evaluation board. The evaluation setup is shown

below.

The DDS Evaluation kit includes a populated, tested AD9831

printed circuit board along with the software which controls the

AD9831 in a Windows environment.

AD9831.EXE

IBM COMPATIBLE PC

PARALLEL PORT

CENTRONICS

PRINTER CABLE

AD9831

EVALUATION

BOARD

Figure 23. AD9831 Evaluation Board Setup

Using the AD9831 Evaluation Board

The AD9831 Evaluation kit is a test system designed to simplify

the evaluation of the AD9831. Provisions to control the

AD9831 from the printer port of an IBM-compatible PC are

included along with the necessary software. An application note

is also available with the evaluation board which gives informa-

tion on operating the evaluation board.

Prototyping Area

An area is available on the evaluation board where the user can

add additional circuits to the evaluation test set. Users may

want to build custom analog filters for the output or add buffers

and operational amplifiers which are to be used in the final

application.

XO vs. External Clock

The AD9831 can operate with master clocks up to 25 MHz. A

25 MHz oscillator is included on the evaluation board. How-

ever, this oscillator can be removed and an external CMOS

clock connected to the part, if required.

Power Supply

Power to the AD9831 Evaluation Board must be provided ex-

ternally through the pin connections. The power leads should

be twisted to reduce ground loops.