problem in driving AD676 - need assistance

[mbkh_84]

ad676 example circuit

I have a serious problem in driving ad676.
I use correct timing in sample and clk pins.
But sometimes after
sample=1;
delay_us(3);
sample=0;
while(busy==0);

while(busy==1) ///This while spend more than 16 cycles
{
clk=1;
delay_us(2);
clk=0;
delay_us(2);
}
clk=1;
delay_us(2);
clk=0;
delay_us(2);

 

[FvM]

problem in AD676

You didn't tell, what's exactly the problem!

But I think, you'll possibly miss the busy=0 state with your code sequence, I would do it this way:

sample=1; 
while(busy==0);
delay_us(3); 
sample=0;

 

[mbkh_84]

problem in AD676

I dont know if you have worked with this ADC but , when you asset SAMPLE pin hign busy will be 0 and it never happens that when you assert SAMPLE high ,Afterward BUSY will go up,
Your while loop is a infinite loop and never exit from this loop.
Sorry not a good reply