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Programmatically / Locally / Remotely controlled Signal - Function Generators | DDS Sine Square Saw Tri

gintaras-valatka

Gintaras Valatka

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Analog Devices AD9833 DDS - making waves already!
02/24/2017 at 05:17 • 0 comments

Received AD9833 - Direct Digital Synthesizer!
We Have some Reference! Managed to pull ~4.5Mhz on VICHY VC99.
The signal was fed directly to VC99(not terminated), while in audible range it was also powering 64Ω headphones (32Ω+32Ω connected in series)
TODO: adding amplifier and digital pots for AREF and amplified signal attenuation, phase shifting. This will be remotely controllable & programmable DDS.
Code borrowed form http://www.vwlowen.co.uk/arduino/AD9833-waveform-generator/AD9833-waveform-generator.htm
AD9833: 0 MHz to 12.5 MHz output frequency range; VOUT Maximum 0.65V
VC99: Frequency 10Hz - 60mHz; Input sensitivity: 0.7V