Free Elektor Article: DDS Function Generator

Free Elektor Article: DDS Function Generator

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DDS chips are readily available, greatly simplifying the design of the analog part of a wide-range function- or signal generator. All you need to do (they say!) is choose one, add some suitable output circuitry, pick a microcontroller, provide a user interface and start programming. To which we reply: sweet dreams, here is the real story: power to the AD9834!

  • Original publication: Elektor magazine 5/2015, page 68.
  • Author: Theodorou Gerasimos (Greece) Post engineering: Ton Giesberts (Elektor Labs)
  • Free download expires: Friday 17 January 2020.

Specifications

• Direct Digital Synthesis (DDS) with analogue front-end
• Frequency range: 1 – 10 MHz
• Frequency resolution: 0.28 Hz
• Output: 0 – 15 Vpp
• THD+N (100 kΩ load, B > 500 kHz):
— 1 V, 1 kHz: 0.12% (0.09% for B = 22 kHz)
— 5 V, 1 kHz: 0.1% (0.09% for B = 22 kHz)
— 1 V, 10 kHz: 0.1% (0.09% for B = 80 kHz)
— 5 V, 10 kHz: 0.09% (0.08% for B = 80 kHz)
— 1 V, 100 kHz: 0.1%
— 5 V, 100 kHz: 0.08%
• S/N (referred to 1 V): 72 dB
• Maximum output (10 MΩ load):
— Sine: 16 Vpp
— Triangle: 16 Vpp
— Square: 18 Vpp
• DC offset voltage range: –10 to +10 V
• Output impedance: 50 Ω
• Duty cycle (square wave): 1 – 99%
• Rise and fall time (80%, square wave): 100 ns
• Sweep mode
• Power consumption: 3 VA

Like what you’re seeing? Then go to the article page and download a pdf copy of the full, original article. Downloading is free from Friday 10 January to Friday 17 January, 2020.

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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