SMAKN&reg; AD9850 Module DDS Signal Generator Module 0-40MHz 2 Sine Wave and 2 Square Wave Output Model: AD9850. Material: durable PCB board and metal. Dimension (L*W): about 4.5cm x 2.6cm. Can output 2 sine waves and 2 square waves. AD9850 frequency range: 0-40MHz. Square Wave: 0-1MHz. The after harmonic becomes bigger and bigger when the frequency is between 20-30MHz,and the wave form becomes unclean. AD9850 adopts 125MHz active crystal.