after the frequency is 20-30MHz, the harmonic wave will become larger and larger, and the waveform will become more and more dirty.Square wave: 0-1MHzAdopt 70MHz low-pass filter to make the ratio of waveform betterLead out the pin (PIN12) that generates DA reference, which is convenient for the amplitude adjustment application of output waveform.The reference input voltage of the comparator is generated by variable electronic resistance, and different duty cycle square waves can be obtained by adjusting the electronic resistance.while the AD9851 module uses 30MHz active crystal oscillatorthe clock frequency of the AD9851 is 180MHz. The output frequency ofAD9851 does 6 frequency doublingThe module can output sine wave and square wave, 2 sine wave and 2 square wave.AD9851: 0-70MHzColour:As shownMaterial:PC+MetalPackage Contents:1 x IC AD9851 ModuleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.