With this module you are able to build your own sine/square wave generator
that runs from 1 Hz till 40 MHz in steps of 1 Hz.
There is some control required. Homebuilders often use a PIC (for example 16F628A).
VK5TM describes some AD9850 generators on his website. Here you will also find the
required hex files for PIC programming:
Some specifications for the AD9850 chip:
The AD9850 is a highly integrated device that uses advanced DDS technology coupled with an internal high speed, high performance, D/A converter and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function.
When referenced to an accurate clock source, the AD9850 generates a spectrally pure, frequency/ phase-programmable, analog output sine wave.
FEATURES and BENEFITS
125 MHz Clock Rate
On-Chip High Performance DAC and High Speed Comparator
DAC SFDR > 50 dB @ 40 MHz AOUT
32-Bit Frequency Tuning Word
Simplified Control Interface: Parallel Byte or Serial Loading Format
Phase Modulation Capability
3.3 V or 5 V Single-Supply Operation
Low Power: 380 mW @ 125 MHz (5 V)
155 mW @ 100 MHz (3.3 V)
Ultrasmall 28-Lead SSOP Packaging