A single resistor, Rset controls the current output level and therefore the output voltage level. This results in a frequency resolution of approximately 30 milli-Hz. In the case of the AD9851, the digital divider is 32 bits and the clock frequency is typically 125 MHz. The devices combine a clock reference with a digital divider and a phase locked loop to provide a sinewave output with very fine resolution. While this article concentrates on the AD9851 device, Analog Devices produces many others that operate in a similar fashion. In this article, we’ll show how to correct these issues, as well as providing some additional tips for improving the quality of the output. The second issue is that the distortion gets pretty horrific, particularly at higher output frequency settings. One issue is that the output amplitude is not constant with frequency, requiring a level control loop. Internet forums are filled with discussions related to two specific issues. An Internet Web search for “Arduino DDS” showed more than 100,000 results, while the same video search turned up many dozens of videos. Arduino has taken the product “maker” world by storm and one of the more popular Arduino modules is the Analog Devices AD9851 DDS waveform generator.
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