Hi ,I have problem with the ADC when I put the input on pin 6 sinewave (2 KHZ 5vp-p) once I put the input on pin 6 I see that the signal is get clipped mean the negative part of the signal is gone and only I have the half positive of the signal so can someone help me

 

Hi ,I have problem with the ADC when I put the input on pin 6 sinewave (2 KHZ 5vp-p) once I put the input on pin 6 I see that the signal is get clipped mean the negative part of the signal is gone and only I have the half positive of the signal so can someone help me

I guess your ADC does not recognize negative voltages. Check the datasheet to see which voltages your ADC is designed to work with.

Or you could move the offset up. I assume right now you have sine wave from -5 volt to +5 volt. If you move the offset up by 5 volt, you sine wave will be from 0 volt to 10 volt. Again check the datasheet of your ADC to see if it accept 10 volt input.

 

I guess your ADC does not recognize negative voltages. Check the datasheet to see which voltages your ADC is designed to work with.

Or you could move the offset up. I assume right now you have sine wave from -5 volt to +5 volt. If you move the offset up by 5 volt, you sine wave will be from 0 volt to 10 volt. Again check the datasheet of your ADC to see if it accept 10 volt input.

Ok. I just checked my textbook. The very very very very basic setup for ADC0804 is input Vin(+) is from 0 volt to 5 volt. So it will simply ignore all the negative voltages you are sending to it. The negative voltages all become 0 volt because that is the lowest that the chip can take.

 

Ok. I just checked my textbook. The very very very very basic setup for ADC0804 is input Vin(+) is from 0 volt to 5 volt. So it will simply ignore all the negative voltages you are sending to it. The negative voltages all become 0 volt because that is the lowest that the chip can take.

thanks it works ok now with positive vin

 

I guess your ADC does not recognize negative voltages. Check the datasheet to see which voltages your ADC is designed to work with.

Or you could move the offset up. I assume right now you have sine wave from -5 volt to +5 volt. If you move the offset up by 5 volt, you sine wave will be from 0 volt to 10 volt. Again check the datasheet of your ADC to see if it accept 10 volt input.

thanks so much,it works now ,and last question when i put 1 vp-p(100 HZ) on pin 3 ,the chip stop working,so is what is the problem