AD9834
Rev. B | Page 28 of 32
EVALUATION BOARD
The AD9834 evaluation board allows designers to evaluate the high
performance AD9834 DDS modulator with a minimum of effort.
To prove that this device meets the user’s waveform synthesis
requirements, the system only requires a power supply, an
IBM®-compatible PC, and a spectrum analyzer together with
the evaluation board.
The DDS evaluation kit includes a populated, tested AD9834
printed circuit board. The evaluation board interfaces to the
parallel port of an IBM-compatible PC. Software is available
with the evaluation board that allows the user to easily program
the AD9834. A schematic of the evaluation board is shown in
Figure 38. The software runs on any IBM-compatible PC that
has Microsoft Windows® 95, Windows 98, Windows ME, or
Windows 2000 NT® installed.
USING THE AD9834 EVALUATION BOARD
The AD9834 evaluation kit is a test system designed to simplify
the evaluation of the AD9834. An application note is also
available with the evaluation board and gives full information
on operating the evaluation board.
PROTOTYPING AREA
An area is available on the evaluation board for the user to add
additional circuits to the evaluation test set. Users can build
custom analog filters for the output or add buffers and
operational amplifiers to be used in the final application.
XO VS. EXTERNAL CLOCK
The AD9834 can operate with master clocks up to 75 MHz. A
75 MHz oscillator is included on the evaluation board.
However, this oscillator can be removed and, if required, an
external CMOS clock can be connected to the part.
POWER SUPPLY
Power to the AD9834 evaluation board must be provided
externally through pin connections. The power leads should be
twisted to reduce ground loops.
