Direct Digital Synthesizer (DDS) applies a method to generate an analog waveform in a digital manner, which is formed by generating a digital signal that varies with time and converting it into analog form using a digital to analog device (DAC). IC AD9851 is an analog waveform generator to implement the DDS method, which generates a frequency that can be changed according to the needs of its users. The digital signal is generated using a PIC 18F4550 microcontroller that has a full-speed USB 2.0 feature to interface with the computer via USB without the need of special drivers to do the communication. Setting of the output frequency can be done via the keypad or buttons programmed via computer. The test results are a wide range of frequency waves produced from 100 Hz to 30 MHz in the form of a sine wave with an amplitude of 430 mV and a square wave with an amplitude of 4,125 V.
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机译：直接数字合成器（DDS）应用了一种以数字方式生成模拟波形的方法，该方法是通过生成随时间变化的数字信号并将其转换为使用数模设备（DAC）的模拟形式而形成的。 IC AD9851是实现DDS方法的模拟波形发生器，其产生的频率可以根据用户的需求进行更改。使用具有全速USB 2.0功能的PIC 18F4550微控制器生成数字信号，无需特殊的驱动程序即可通过USB与计算机接口。可以通过键盘或计算机编程的按钮来设置输出频率。测试结果是从100 Hz到30 MHz的宽范围的频率波，形式为正弦波，振幅为430 mV，方波为振幅4,125V。
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