SainSmart AD9851 DDS Signal Generator Module Circuit Diagram, 2 sine wave(0-70MHz) and 2 square wave(0-1MHz) output Use 70MHz low pass filter, so waveform is better than SN Parallel and serial data input can be selected via a jumper The benchmark produces DA pin (PIN12) leads for easy adjustment to do the magnitude of the output waveform applications AD9851 module is the active crystal 30MHZ