The AD9854 digital synthesizer is a highly integrated device. It uses advanced DDS technology and integrates two high-speed, high-performance quadrature D/A converters on the chip to output I and Q two-way synthesized signals through digital programming. Driven by a high stability clock, the AD9854 will generate a highly stable sine and cosine signal with frequency, phase, and amplitude as the local oscillator for communication, radar, and more. The AD9854 DDS core has a 48-bit frequency resolution (with a resolution of up to 1uHZ at 300M system clock). Outputting a 17-bit phase cutoff guarantees a good spurious-free dynamic range specification. The AD9854 allows output signals up to 150 MHz and the digital modulation output frequency up to 100 MHz. The internal high-speed comparator sine wave is converted into square wave output and can be used as a convenient clock generator.
Ad9854 Advantages and Features00MHz internal clock rate
FSK, BPSK, PSK, Linear FM, AM Operation
Two integrated 12-bit digital-to-analog converters (DACs)
Ultra-high-speed comparator, RMS jitter: 3ps
Excellent dynamic performance: 80dBSFDR(100MHz±1MHzAOUT)
4× to 20× Programmable Reference Clock Multiplier
Two 48-bit programmable frequency registers
Two 14-Bit Programmable Phase Offset Registers
12-bit programmable amplitude modulation and switching output shape keying
Single Pin FSK and BPSK Data Interfaces
PSK functionality via input/output interface
Linear or non-linear FM linear frequency modulation with single-pin frequency hold
Signal generator circuit composed of ad9854The keyboard has a total of 16 keys consisting of four lines P1.0-P1.3 and four lines P1.4-P1.7. Including the number keys, unit keys and function keys, used to control the frequency, amplitude and function of the desired signal, the final output signal frequency, amplitude and other information through the LCD display. The display part adopts GXM1602NSL LCD module of Guoxian, its core is HD44780. The data transmission with the W78E58 adopts 8-bit parallel transmission and can display 32 lines of characters in two lines. HD44780 supports user-defined characters, so it can be programmed to display Chinese characters and digital information such as frequency, amplitude, and waveform. The communication interface (RS232) is also used in conjunction with the PC. The PC's control commands can interact with the W78E58 via TXD (Pin 10) and RXD (Pin 11) to control the output of the signal source.
#include <stm32f10x_lib.h"
#include "sys.h"
#include "delay.h"
#define AD9854_DATA GPIOC-"ODR
#define AD9854_ADDR GPIOC-"ODR
#define ad9854_reset PBout(12)
#define ad9854_rd PBout(13)
#define ad9854_wr PBout(14)
#define ad9854_updata PBout(15)
Unsigned char ControlRegister[]={0x14,0x4f,0x00,0x60}; //AD9852 control register initial value, Mode 0
Unsigned char FTW[]={0x00,0x00,0x37,0xec}; //Frequency Tuning The FTW value corresponding to the output frequency after Word 1 frequency multiplication 300MHz
Unsigned char PAR[]={0x00,0x00}; //Phase Adjust Register 1
Unsigned char OSK[]={0x0a,0xff}; //Output shaped keying multiplier, 650mv
Voidsingle_wave(unsigned long intfre);
Void Init_AD9854(void);
Void AD9854_Set_Mode0(void);
Void AD9852_Send(unsigned char addr, unsigned char data);
Voidchange_frequency(unsigned long intfre_temp); voidInit_Port(void);
Int main( void )
{
Stm32_Clock_Init(9); // 9 times frequency
Delay_init(72); // 72M crystal delay
Delay_ms(200);
Init_Port();
Init_AD9854();
Single_wave(1000000);
While(1);
}
voidInit_Port(void)
{
RCC-"APB2ENR |= 1<<3 ;
GPIOB-"CRH &= 0x0000ffff ;
GPIOB-"CRH |= 0x33330000;
GPIOB-"ODR |= 0xf000 ;
RCC-"APB2ENR |= 1<<4 ;
GPIOC-"CRL &= 0x00000000 ;
GPIOC-"CRL |= 0x33333333 ;
GPIOC-"CRH &= 0x00000000 ;
GPIOC-"CRH |= 0x33333333 ;
GPIOC-"ODR |= 0xffff ;
}
Void AD9852_Send(unsigned char addr, unsigned char data) // Follow the parallel input timing
{
Ad9854_wr = 1; // AD9854_WR_SET;
AD9854_ADDR &= 0x00ff|addr<<8;
AD9854_ADDR |= 0xff00&addr<<8;
Ad9854_wr = 1; // AD9854_WR_SET;
AD9854_DATA &= 0xff00|data;
AD9854_DATA |= 0x00ff&data;
Ad9854_wr = 0; // AD9854_WR_CLR; ad9854_wr = 1; // AD9854_WR_SET; ad9854_updata = 1; //
AD9854_UPDATA_SET;
Ad9854_updata = 0; //
AD9854_UPDATA_CLR;
}
Void Init_AD9854(void)
{
Unsigned char addr;
Unsigned char i;
Ad9854_reset = 0 ; // AD9854_RESET_CLR;
Ad9854_wr = 1 ; // AD9854_WR_SET; ad9854_rd = 0 ; // AD9854_RD_CLR; ad9854_updata = 0 ; // AD9854_UPDATA_CLR;
Addr = 0x1d;
For(i=4;i"0;i--)
{
AD9852_Send(addr,ControlRegister[4-i]);
Addr++;
}
}
Void AD9854_Set_Mode0(void) //Mode 0 settings
{
Unsigned char addr;
Unsigned char counter;
For(addr=0x00,counter=2;counterâ€0;counter--) //Set Phase Adjust Register 1
{
AD9852_Send(addr,PAR[2-counter]);
Addr++;
}
For(addr=0x04,counter=4;counterâ€0;counter--) //Set Frequency Tuning Word 1
{
AD9852_Send(addr,FTW[4-counter]);
Addr++;
}
For(addr=0x21,counter=2;counterâ€0;counter--) //Set Output shaped keying multiplier
{
AD9852_Send(addr,OSK[2-counter]);
Addr++;
}
}
Voidsingle_wave(unsigned long intfre)
{
Unsigned char addr,i;
Unsigned long intff;
Unsigned char *p;
Ff=(unsigned long int)(4294967296*fre/300000000); p=(unsigned char*)&ff;
For(addr=0x04,i=0;i<4;i++) //Set Frequency Tuning Word 1
{AD9852_Send(addr,*(p+3-i));
Addr++;
}
For(addr=0x00,i=0;i<2;i++) //Set Phase Adjust Register 1
{
AD9852_Send(addr,PAR[i]);
Addr++;
}
For(addr=0x21,i=2;i"0;i--) //set
Output shaped keying multiplier
{
AD9852_Send(addr,OSK[2-i])
Addr++;
}
}
Voidchange_frequency(unsigned long intfre_temp) {
Unsigned char addr,counter;
Unsigned char *p;
p=(unsigned char*)&fre_temp;
For(addr=0x04,counter=0;counter<4;counter++) //Set Frequency Tuning Word 1
{
AD9852_Send(addr,*(p+3-counter));
Addr++;
}
}
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