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The Synthesis library is intended initially to provide an interface to the AD9835[1] Direct Digital Synthesis (DDS) IC.

For those who have not come across the family before, the AD9835 is a 50MS/s sinusoidal DDS. While it does not have the fancy multichip synchronisation and PLL functionality of some of the more upmarket brethren, it provides a quick and easy way to produce a software-tunable sinusoidal oscillator.

For an example of the Library's use, see https://github.com/LachlanGunn/Synthesis/blob/master/examples/fixed/Fixed.pde.

[1] Analog Devices, AD9835: Complete DDS With 10-Bit On-Chip DAC.