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Ci-dessous, les différences entre deux révisions de la page.

--- materiel:ad9850:accueil [2015/02/18 18:15]
resonance créée
+++ materiel:ad9850:accueil [2016/02/01 00:05] (Version actuelle)
resonance
@@ Ligne 1: / Ligne 1: @@
 ====== AD9850 ======
+{{:materiel:ad9850:oscillo-ad9850.jpg?500|}}\\
+Générateur de signaux sinusoïdaux ou carré.
+{{youtube>3lNGF0PJUpk?medium}}
+===== Datasheet =====
+  * {{:materiel:ad9850:ad9850.pdf|}}
+  * 2 sine wave and 2 square wave output (mais tous avec la même fréquence !)
+  * AD9850: 0-40MHz
+  * After the 20-30MHz frequency harmonics increases, the waveform will be less and less clean
+  * Square Wave: 0-1MHz
+  * Low-pass filter with 70MHz, so the waveform better than SN
+  * Parallel and serial data input can be selected via a jumper
+  * DA produced the benchmark pin (PIN12) leads for easy adjustment to do the magnitude of the output waveform Application
+  * Comparator reference input voltage generated by the variable resistor, the resistor can be adjusted duty cycle square wave of different
+  * Active AD9850 125MHz crystal oscillator modules
+===== Avec Arduino =====
+  * https://code.google.com/p/ad9850-arduino/
+  * http://www.elecfreaks.com/wiki/index.php?title=DDS_Module_-_AD9850
+  * http://arduino.alhin.de/index.php?n=67
+  * http://nr8o.dhlpilotcentral.com/?p=83
+  * http://rockingdlabs.dunmire.org/exercises-experiments/ad-9850-dds-synthesizer
+  * http://www.alhin.de/arduino/index.php?n=7
+  * http://www.kerrywong.com/2012/11/06/dds-function-generator-build/
+  * http://webshed.org/wiki/AD9850_Arduino
+==== Connection ====
+Il suffit de 6 fils.
+| **ARDUINO** | **AD9850** |
+| 5V | VCC |
+| GND | GND |
+| 8 | W_CLK |
+| 9 | FQ_UD |
+| 10 | DATA |
+| 11 | RESET |
+{{:materiel:ad9850:arduino-deux-ad9850.jpg?600|}}
+==== Code Arduino pour deux modules ====
+**Sans librairie à installer** ++++ Voir le code |
+<code c>
+/*
+ * USE TWO AD9850
+ * Modified from http://nr8o.dhlpilotcentral.com/?p=83
+ */
+ // 1st MODULE
+ #define W_CLK 8       // Pin 8 - connect to AD9850 module word load clock pin (CLK)
+ #define FQ_UD 9       // Pin 9 - connect to freq update pin (FQ)
+ #define DATA 10       // Pin 10 - connect to serial data load pin (DATA)
+ #define RESET 11      // Pin 11 - connect to reset pin (RST).
+ // 2nd MODULE
+ #define W_CLK2 4       // Pin 4 - connect to AD9850 module word load clock pin (CLK)
+ #define FQ_UD2 5       // Pin 5 - connect to freq update pin (FQ)
+ #define DATA2 6       // Pin 6 - connect to serial data load pin (DATA)
+ #define RESET2 7      // Pin 7 - connect to reset pin (RST).
+ #define pulseHigh(pin) {digitalWrite(pin, HIGH); digitalWrite(pin, LOW); }
+ // transfers a byte, a bit at a time, LSB first to the 9850 via serial DATA line
+void tfr_byte(byte data, int pin_clock, int pin_data)
+{
+  for (int i=0; i<8; i++, data>>=1) {
+    digitalWrite(pin_data, data & 0x01);
+    pulseHigh(pin_clock);   //after each bit sent, CLK is pulsed high
+  }
+}
+ // frequency calc from datasheet page 8 = <sys clock> * <frequency tuning word>/2^32
+void sendFrequency(double frequency, int pin_clock, int pin_fq, int pin_data) {
+  int32_t freq = frequency * 4294967295/125000000;  // note 125 MHz clock on 9850
+  for (int b=0; b<4; b++, freq>>=8) {
+    tfr_byte(freq & 0xFF, pin_clock, pin_data);
+  }
+  tfr_byte(0x000, pin_clock, pin_data);   // Final control byte, all 0 for 9850 chip
+  pulseHigh(pin_fq);  // Done!  Should see output
+}
+void setup() {
+ // configure arduino data pins for output
+  pinMode(FQ_UD, OUTPUT);
+  pinMode(W_CLK, OUTPUT);
+  pinMode(DATA, OUTPUT);
+  pinMode(RESET, OUTPUT);
+  pinMode(FQ_UD2, OUTPUT);
+  pinMode(W_CLK2, OUTPUT);
+  pinMode(DATA2, OUTPUT);
+  pinMode(RESET2, OUTPUT);
+  pulseHigh(RESET);
+  pulseHigh(W_CLK);
+  pulseHigh(FQ_UD);  // this pulse enables serial mode - Datasheet page 12 figure 10
+  pulseHigh(RESET2);
+  pulseHigh(W_CLK2);
+  pulseHigh(FQ_UD2);  // this pulse enables serial mode - Datasheet page 12 figure 10
+}
+void loop() {
+  sendFrequency(1320, W_CLK, FQ_UD, DATA);  // freq
+  sendFrequency(440, W_CLK2, FQ_UD2, DATA2);  // freq
+  while(1);
+}
+</code>
+++++
+**Avec la librairie [[http://arduino.alhin.de/download.php?id=28|AH_AD9850.h]]**
+++++ Voir le code |
+<code c>
+// from http://www.arduino-projekte.de
+#include <AH_AD9850.h>
+#define CLK     6
+#define FQUP    7
+#define BitData 8
+#define RESET   9
+AH_AD9850 AD9850(CLK, FQUP, BitData, RESET);
+void setup()
+{
+  AD9850.reset();                   //reset module
+  delay(1000);
+  AD9850.powerDown();               //set signal output to LOW
+  // initialize serial communication
+  Serial.begin(9600);
+}
+void loop(){
+ //set_frequency(boolean PowerDown, byte Phase, double Freq);
+ AD9850.set_frequency(0,0,1000);    //set power=UP, phase=0, 1kHz frequency
+ delay(1000);
+ AD9850.set_frequency(2500);        //set 2.5kHz frequency
+ delay(1000);
+ AD9850 << 5000;                    //set 5kHz frequency in C++ style
+ delay(1000);
+ //phase test
+ for (int phase=0;phase<32;phase++)
+ {
+   AD9850.set_frequency(0, phase, 1000);   //change phase delay in 11.25°(2PI/32) steps
+   delay(1000);
+ }
+}
+</code>
+++++
+===== Modulation =====
+Deux signaux modulés par une porte ET : \\
+{{:materiel:ad9850:ad9850-modulation.jpg?400|}}
+Le schéma de la porte ET avec deux diodes et une résistance (merci Patrick!)\\
+{{:materiel:ad9850:and_10.gif|}}
+===== Signal carré =====
+Il faut modifier le "duty cycle" du signal carré avec le potentiomètre.
+{{:materiel:ad9850:ad9850-square.jpg?600|}}
-{{:materiel:ad9850:oscillo-ad9850.jpg?300|}}

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