# DDS generator module, AD9850, 0-40MHz, 3.3-5V

> DDS generator module AD9850, supply voltage 3.3-5VDC, compatible with Arduino and other development boards. Generates sine wave 0-40MHz and square wave 0-1MHz, with 2 sine outputs and 2 square outputs, adjustable duty cycle via potentiometer. 10-bit DAC, 32-bit frequency control word, active crystal 125MHz, low pass filter 70MHz. Dimensions 45 x 30 x 15 mm.

- Page: https://sigmanortec.ro/en/dds-generator-module-ad9850-0-40mhz-33-5v
- Price: 92.24 RON
- Availability: In stock; 1-2 zile
- Reference: 9947 · EAN: 5943229394800
- Category: Electronic components > Testing and Measurement > Signal Generators
- Specifications: tension: AD; Supply Voltage: 3.3; Maximum Input Voltage: 5
- Package (shipping data): 0.006 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:49 (Europe/Bucharest)

## Description

DDS generator for Arduino and other boards, ideal for RF testing, laboratory signals and prototyping, allows rapid frequency change through high-resolution digital control, generates sine 0-40MHz and square 0-1MHz, offers 2 sine outputs and 2 square outputs with adjustable duty cycle, operates at 3.3-5V and includes 125MHz active clock.
DDS (Direct Digital Synthesizer) module, compatible with Arduino and other development boards, which allows dividing the frequency of the system clock (clock) by programming a frequency control word, being able to quickly change the output frequency, thus generating the frequencies needed for various applications.
The module operates in the digital domain and offers significant advantages such as fast output frequency change and high frequency resolution.
The internal structure of the DDS includes three main components: the phase accumulator, the phase-amplitude conversion and the digital-to-analog converter (DAC).
The module can generate sine wave and square wave, having 2 outputs for sine wave and 2 outputs for square wave. the output frequency for this module is between 0 and 40MHz for the sine wave and between 0 and 1MHz for the square wave, with the possibility of adjusting the duty cycle through the integrated potentiometer.
Note
At frequencies between 20-30MHz, the harmonics become more and more pronounced, and the waveform becomes less clean.
Adjusting the variable resistor can alter the duty cycle of the square wave to suit specific requirements.
Specifications:
Supply voltage: 3.3 - 5VDC
Types of Generated Waves: Sine and Square
Sine Output Frequency: 0-40MHz
Square Output Frequency: 0-1MHz
Continuous Digital Output Current: 0.005A
DAC Output Current: 0.03A
Low Filter: 70MHz for SNR improvement
DAC: 10-bit
Frequency Control Word: 32-bit
Active Crystal: 125MHz
Input Reverse Protection: Yes
Dimensions: 45 x 30 x 15 mm
Pinouts:
VCC : Power pin. It supports 3.3V or 5V voltage input.
GND : Ground Pin (GND).
W_CLK : Update Frequency. On the rising edge of this clock, DDS will update the frequency (or phase) loaded in the data input register, then reset the pointer to Word 0.
DATE : D7, Serial Loading.
RESET : Reset. Main reset function; when enabled (set high), it clears all registers (except the input register) and the DAC output will return to Cosine 0 after additional clock cycles.
D0–D7 : 8-Bit Data Input. This is the 8-bit data gate for iterative loading of the 32-bit control word for frequency and 8-bit for phase/28–25. D7 = MSB; D0 = LSB. D7 (Pin 25) also serves as the input pin for the 40-bit serial data word.
Square Wave Output 1 : The real output of the comparator.
Square Wave Output 2 : The complementary output of the comparator.
Sine Wave Output 1 : The current analog output of the DAC.
Sine Wave Output 2 : Complementary analog output of the DAC.
Example:
- Connect the AD9850 module to Arduino using the following pins:
W_CLK_PIN from the module to digital pin 13 on the Arduino .
FQ_UD_PIN to digital pin 8 .
RESET_PIN to digital pin 9 .
Make sure the module is also connected to the proper VCC and GND .
- Download and install the AD9850SPI library (byF4GOJ) in the Arduino IDE if it is not already installed.
Use the following test code (The DDS Module should now generate a 10 MHz wave, which is changed after 15 seconds to 10.0005 MHz.):
\#it includes
\#it includes
const int W_CLK_PIN = 13;
const int FQ_UD_PIN = 8;
const int RESET_PIN = 9;
double freq = 10000000; // Desired frequency of 10 MHz
double trimFreq = 124999500; // Calibration frequency for the DDS crystal
int phase = 0; // Phase of the signal
void setup(){
DDS.begin(W_CLK_PIN, FQ_UD_PIN, RESET_PIN);
DDS.calibrate(trimFreq);
}
void loop(){
DDS.setfreq(freq, phase);
delay(10000); // Hold the frequency for 10 seconds
DDS.down(); // Stop the DDS signal
delay(3000); // Wait 3 seconds
DDS.up(); // Restart the DDS signal
delay(2000); // Wait 2 seconds
DDS.setfreq(freq + 500, phase); // Change the frequency
delay(5000); // Hold the new frequency for 5 seconds
DDS.down(); // Stops the DDS signal permanently
while(1); // Loop stop
}