Elektor DDS Function Generator

A few years ago I needed a function gen-erator for my home laboratory. In my job I had worked with some expensive commercial models and initially I had planned to buy one of these. However, none of them really was what I wanted – too complex for simple use – and so I decided to design and build my own. It turned out to be DDS (direct digital syn – thesis) based but that was not the only component selection issue I ran into. Here are a few more.
My components, your components? After researching various techniques I settled on a Direct Digital Synthesis (DDS) based architecture for my project. DDS employs a digital oscillator with quartz crystal precision to accurately generate sinewaves up to very high frequencies. For the microcontroller I chose one from Analog Devices. Although well known for their Digital Signal Processor (DSP) families, this may not be the first MCU manufacturer that comes to mind. They do have a nice family though of 32-bit ARM controllers supported by something I like a lot: comprehensive documentation.
DDS Function Generator
Analog Devices manages to fit a complete description of a complex microcontroller into a document of slightly more than a hundred pages. Analog Devices also specializes in DDS chips, operational amplifiers and other analog support chips and so made for a great one-stop shop for this project. Their friendly sampling service quickly got me started without forking out a lot of money. The MCU I selected was then ADuC7024BSTZ62, a member of the Precision Analog Microcontroller family in a 64-pin package, containing an ARM7TDMI core running at 44-MHz clock speed.

About The Author

Scroll to Top
Read previous post:
provide you unexpected space
19″ system of enclosures will provide you unexpected space

What enclosure to use for your electronic device and how to sort them when there are several ones on one...