dac0832中文资料引脚图电路原理

dac0832中文资料引脚图电路原理

DAC0832是采样频率为八位的D/A转换器件,下面介绍一下该器件的中文

资料以及电路原理方面的知识。

DAC0832内部结构资料:芯片内有两级输入寄存器，使DAC0832具备双缓冲、单缓冲和直通三种输入方式，以便适于各种电路的需要(如要求多路D/A异步输入、同步转换等)。D/A转换结果采用电流形式输出。要是需要相应的模拟信号，可通过一个高输入阻抗的线性运算放大器实现这个供功能。运放的反馈电

阻可通过RFB端引用片内固有电阻，海可以外接。

该片逻辑输入满足TTL电压电平范围，可直接与TTL电路或微机电路相接，

下面是芯片电路原理图

DAC0832引脚图和内部结构电路图

DAC0832应用电路图

电路图如上图所示,此接法是用DAC0832的直通方式,只要二进制数据送到DAC0832的数据口,则会自动把数据转为相应的电压.但运放是如图的电压则输出一般不可能达到基准电压.要想达到基准电压则要提高运放的电压.当基准为负是,只要提高运放的正电压就可以使输出达到基准电压了,当基准为正是,则为提高运放的负电压,一般的运放提高两伏就可以了,但不同的运放会有些区别. 程序如下:

1.输出固定电压的程序

#include \

void DAC0832(unsigned char x) {

P2=x; }

void main() {

DAC0832(255); while(1){ ;}

}

2.输出三角波与正弦波程序．

#include

unsigned char flag; //波型输出标置变量 bit time;

unsigned char sin(unsigned char x) {

unsigned char code sin_tab[]={125,128,131,134,138,141,144,147,150,153,156,159,

162,165,168,171,174,177,180,182,185,188,191,193,196,198,201,203, 206,208,211,213,215,217,219,221,223,225,227,229,231,232,234,235, 237,238,239,241,242,243,244,245,246,246,247,248,248,249,249,250, 250,250,250,250,250,250,250,249,249,248,248,247,246,246,245,244, 243,242,241,239,238,237,235,234,232,231,229,227,225,223,221,219, 217,215,213,211,208,206,203,201,198,196,193,191,188,185,182,180, 177,174,171,168,165,162,159,156,153,150,147,144,141,138,134,131, 128,125,122,119,116,112,109,106,103,100,97,94,91,88,85,82,79,76,73, 70,68,65,62,59,57,54,52,49,47,44,42,39,37,35,33,31,29,27,25,27,29,27,25,23,21,

19,18,16,15,13,12,11,9,8,7,6,5,4,4,3,2,2,1,1,0,0,0,0,0,0,0,0,1,1,2, 2,3,4,4,5,6,7,8,9,11,12,13,15,16,18,19,21,23,25,27,29,31,33,35,37, 39,42,44,47,49,52,54,57,59,62,65,68,70,73,76,79,82,85,88,97,94,97, 100,103,106,109,112,116,119,122}; return sin_tab[x]; }

void DAC0832(unsigned char x) {

P2=x; }

void main() {

unsigned char i;

TMOD=0X02; //定时器0用于控制输出波的频率 TH0=256-40;

ET0=1; //按键接于外部中断0，与中断1 IT0=1; IT1=1;

EX0=1; EX1=1; EA=1; TR0=1;

flag=0; //开始时无输出 i=0;

while(1) {

if(time==1)

{

time=\ if(i>249) i=\ else i++;

switch(flag) //当按键1的为输出三角波，按键2时输出正弦波 {

case 0:DAC0832(0);break; case 1:

if(i>125)

DAC0832(250-i); else

DAC0832(i); break; case 2:

DAC0832(sin(i)); break;

default: break;

} } } }

void time0() interrupt 1 {

time=\}

void int0() interrupt 0

{ //按键1接于外部中断0

flag=\}

void int1() interrupt 2 //按键2接于外部中断1 {

flag=\}