DDS-3X25 USB Digital Input/Output Select menu “Digital IO”, you can change the current digital IO mode. At the digital IO terminals on the DDS-3X25 USB, there are 20 IO pins, including 2 pins for GND, 6 pins for Digital In and 12 pins for Digital Out. There are two Digital Out modes in DDS-3X25 USB: Pattern Generator and Programmable Output. 1. Pattern Generator: The vertical resolution of DDS-3X25 is 12bits, and in this mode, you can get the value of each bit through the digital out pins. The LSB is O0, and O11 is MSB. With a logic analyzer, you will get a good view. Example:
Let the DDS-3X25 USB generate a 1 KHz, 2.00V, Sine waveform and connect the O0, O1-O11 pins to the A0, A1-A11 channels of a logic analyzer. Then you will see the sine waveform on the logic analyzer. DDS-3X25 USB User’s Guide 25