Pinout — AD9850 DDS Signal Generator Module

Pin	Signal	Description
`ZOUT2`	analog	Sine-wave DDS analog output from the AD9850 output network.
`ZOUT1`	analog	Sine-wave DDS analog output from the AD9850 output network.
`QOUT2`	digital	Square-wave comparator output derived from the DDS sine signal.
`QOUT1`	digital	Square-wave comparator output derived from the DDS sine signal.
`GND`	ground	Ground reference for power, logic control, and output signals.
`RESET`	reset	AD9850 reset control input; use to initialize the DDS state.
`DATA`	data	Serial programming data input for loading frequency and control words.
`FU_UD`	digital	Frequency update strobe; latches loaded tuning word into the DDS.
`W_CLK`	clock	Serial word clock input for shifting programming data into the AD9850.
`VCC`	power	Module power input, typically 5 V for AD9850 operation.
`GND.1`	ground	Ground reference for power, logic control, and output signals.
`D7`	data	Parallel programming data bus bit 7 input for the AD9850.
`D6`	data	Parallel programming data bus bit 6 input for the AD9850.
`D5`	data	Parallel programming data bus bit 5 input for the AD9850.
`D4`	data	Parallel programming data bus bit 4 input for the AD9850.
`D3`	data	Parallel programming data bus bit 3 input for the AD9850.
`D2`	data	Parallel programming data bus bit 2 input for the AD9850.
`D1`	data	Parallel programming data bus bit 1 input for the AD9850.
`D0`	data	Parallel programming data bus bit 0 input for the AD9850.
`VCC.1`	power	Module power input, typically 5 V for AD9850 operation.

Wiring notes

Voed de module met 5V (VCC) en GND. Seriële besturing (aanbevolen, 4 lijnen): W_CLK (word clock), FQ_UD (frequency update / latch), DATA (seriële data) en RESET, elk naar een vrije digitale pin van de microcontroller. Let op: op deze module is de update-pin als FU_UD gelabeld (= FQ_UD). Alternatief is de 8-bit parallelle bus D0-D7 plus W_CLK/FQ_UD/RESET. Uitgangen: ZOUT1/ZOUT2 leveren de sinus, QOUT1/QOUT2 de blok-/comparatoruitgang. De module heeft een eigen 125 MHz referentieklok aan boord; er zijn geen externe protectiecomponenten nodig voor 5V-boards. Op een 3.3V-board (ESP32/ESP8266) de stuurlijnen via een level shifter aansluiten.

Example wiring diagram — AD9850 DDS Signal Generator Module

From	To	Wire
`board:5V`	`x1:VCC`	red
`board:GND`	`x1:GND`	black
`board:D8`	`x1:W_CLK`	green
`board:D9`	`x1:FU_UD`	blue
`board:D10`	`x1:DATA`	yellow
`board:D11`	`x1:RESET`	purple

Example Arduino code — AD9850 DDS Signal Generator Module

This example was written and compile-checked for the arduino-uno. Codey Online adapts it to any other supported board for you.

// Canonical beginner example for the AD9850 DDS Signal Generator Module
// This sketch sends a serial programming word to set an output frequency.
// Wiring used:
//   D8  -> W_CLK
//   D9  -> FU_UD
//   D10 -> DATA
//   D11 -> RESET
//   5V  -> VCC
//   GND -> GND

const int PIN_W_CLK = 8;
const int PIN_FQ_UD = 9;   // Module label is FU_UD
const int PIN_DATA  = 10;
const int PIN_RESET = 11;

const unsigned long CLOCK_HZ = 125000000UL; // AD9850 reference clock on the module

void pulsePin(int pin) {
  digitalWrite(pin, HIGH);
  delayMicroseconds(1);
  digitalWrite(pin, LOW);
  delayMicroseconds(1);
}

void ad9850Reset() {
  digitalWrite(PIN_RESET, HIGH);
  delayMicroseconds(1);
  digitalWrite(PIN_RESET, LOW);
  delayMicroseconds(1);
  pulsePin(PIN_W_CLK);
  pulsePin(PIN_FQ_UD);
}

void ad9850SetFrequency(double frequencyHz) {
  // DDS tuning word = frequency * 2^32 / clock
  uint32_t tuningWord = (uint32_t)((frequencyHz * 4294967296.0) / (double)CLOCK_HZ);

  // Send 32-bit tuning word, LSB first
  for (int i = 0; i < 32; i++) {
    digitalWrite(PIN_DATA, (tuningWord >> i) & 0x01);
    pulsePin(PIN_W_CLK);
  }

  // Control byte: 0x00 for normal 28-bit frequency mode
  for (int i = 0; i < 8; i++) {
    digitalWrite(PIN_DATA, LOW);
    pulsePin(PIN_W_CLK);
  }

  // Latch the new frequency
  pulsePin(PIN_FQ_UD);
}

void setup() {
  pinMode(PIN_W_CLK, OUTPUT);
  pinMode(PIN_FQ_UD, OUTPUT);
  pinMode(PIN_DATA, OUTPUT);
  pinMode(PIN_RESET, OUTPUT);

  digitalWrite(PIN_W_CLK, LOW);
  digitalWrite(PIN_FQ_UD, LOW);
  digitalWrite(PIN_DATA, LOW);
  digitalWrite(PIN_RESET, LOW);

  Serial.begin(9600);
  while (!Serial) {
    ;
  }

  Serial.println(F("AD9850 DDS generator starting..."));
  ad9850Reset();

  // Set a beginner-friendly test frequency
  ad9850SetFrequency(1000000.0); // 1 MHz
  Serial.println(F("Output frequency set to 1 MHz"));
}

void loop() {
  // Nothing to do here for the canonical example.
  delay(1000);
}