DDS Signal Generator Module Development Board AD9850 AD9851 2 Sine Wave 2 Square Wave

Direct Digital Synthesizer (DDS) is actually a frequency divider: divide the system clock (SYSTEM CLOCK) by programming the frequency control word to generate the required frequency. DDS has two outstanding features. On the one hand, DDS works in the digital domain. Once the frequency control word is updated, the output frequency will change accordingly and its frequency hopping rate is high. Higher), high frequency resolution. The internal structure of DDS is mainly divided into 3 parts: phase accumulator, phase amplitude conversion, digital-to-analog converter (DAC).   Features: The module can output sine wave and square wave, 2 sine wave and 2 square wave output. AD9850: 0-40MHz AD9851: 0-70MHz After the frequency is 20-30MHz, the harmonic becomes larger and larger, and the waveform will become more and more unclean. Square wave: 0-1MHz Uses a 70MHz low-pass filter to make the waveform's SN ratio better 10-bit DAC, 32-bit frequency control word The comparator's referenc