Produk Inovatif

Dengan menggunakan arduino kita dapat mengatur frekuensi output dari DDS9850. Berikut adalah program yang dapat digunakan.

Output yang dihasilkan.

/* * A simple single freq AD9850 Arduino test script * Original AD9851 DDS sketch by Andrew Smallbone at www.rocketnumbernine.com * Modified for testing the inexpensive AD9850 ebay DDS modules * Pictures and pinouts at nr8o.dhlpilotcentral.com * 9850 datasheet at http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf * Use freely */ 
#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). 
#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) 
{ 
for (int i=0; i<8; i++, data>>=1) 
{ 
digitalWrite(DATA, data & 0x01); 
pulseHigh(W_CLK);   //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) 
{ 
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); 
} 
tfr_byte(0x000);   // Final control byte, all 0 for 9850 chip pulseHigh(FQ_UD);  // 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); 
pulseHigh(RESET); 
pulseHigh(W_CLK); 
pulseHigh(FQ_UD);  // this pulse enables serial mode - Datasheet page 12 figure 10 
} 
void loop() 
{ 
sendFrequency(10.e6);  // freq while(1); 
}

Demikian, semoga bermanfaat.

Reference:

Testing an eBay AD9850 DDS module with Arduino Uno