Introduction
This Technical Note describes the evaluation board for the AD9831 Direct Digital Synthesizer (DDS). The AD9831 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 25 MHz. Both phase modulation and frequency modulation can be performed with the AD9831. Full data on the AD9831 is available in the AD9831 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 AD9831.
Components on the AD9831 Evaluation Board include a 25 MHz oscillator which provides the MCLK for the AD9831. The user can remove this oscillator, if required, and drive the AD9831 with a different clock oscillator or an external clock source via a BNC connector. Latches (74HC574) are also on the board, these latches being used to hold the 16-bit data word being written from the PC to the AD9831.
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 AD9831 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:
