DDS Signal Generator Sine and Square Wave 0-40MHz HC-SR08 with AD9850 Module

Main Features:

• The module allows for output of sine waves and square waves, providing 2 sine wave outputs and 2 square wave outputs.
• When the frequency is set to 20-30MHz, the harmonics continue to increase and the waveform becomes increasingly unstable.
• Square wave: 0-1MHz
• Employs a 70MHz low-pass filter, creating a better signal-to-noise ratio (SNR) for the waveform.
• Includes PIN12 which generates a DA reference, facilitating amplitude setting for the output waveform.
• The voltage of the comparator's input reference is generated using different resistors. By adjusting these resistors, various operational values for the square waves can be achieved.
• The AD9850 module uses a 125MHz active crystal oscillator, while the AD9851 module uses a 30MHz active crystal oscillator.

Specifications:

• Model: HC-SR08/DDS_AD9850
• Power Supply: 3.3–5V
• Chip: AD9850
• Sine Signal: 0–40 MHz
• Square Signal: 0–1MHz
• 2 Sine Outputs and 2 Square Outputs
• 70MHz Low-pass Filter
• Parallel and Serial Data Input, selectable via jumper on the PCB
• Dimensions: 45×26mm

Main differences between AD9850 and AD9851:

• AD9850 clock frequency is 125MHz and AD9851 clock frequency is 180MHz. The output frequency of AD9851 is higher than that of AD9850.
• AD9850 does not have 6 times frequency capability, while AD9851 does.