Introduction
This Technical Note describes the evaluation board for the AD9835 Direct Digital Synthesizer (DDS). The AD9835 is a numerically controlled oscillator employing a phase accumulator, a sine look-up table and a 10-bit D/A converter. The part can be operated with clock frequencies up to 50 MHz. Both phase modulation and frequency modulation can be performed with the AD9835. Full data on the AD9835 is available in the AD9835 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the evaluation board.
The evaluation board interfaces to the parallel port of an IBM compatible PC. Software is available with the evaluation board which allows the user to easily program the AD9835.
Components on the AD9835 Evaluation Board include a 50 MHz oscillator which provides the MCLK for the AD9835. The user can remove this oscillator, if required, and drive the AD9835 with a different clock oscillator or an external clock source via a BNC connector. A digital buffer is also on the board so that the signals from the edge connector are buffered.
Documentation
Technical notes are available in Adobe Acrobat Portable Document Format (PDF).
To download the Technical Note, select the link below:
Software
The software provided runs under Windows 2000 and will allow the user to control all the functions of the AD9835 via the printer port of a PC. The software should be installed by running the SETUP.EXE program.
To download the software, select the link below:
