shaz
Member level 4
Dear all
i am designing a temperature controller with input range from
-8.825mV to 54.8mV . i have designed a opamp circuit in which i get a particular ouput volatge say 3.1volts. furthur i have to give this input to the adc and to 8051.
now my problem is when i test the output of the analog stage it gives me correct value. and when i apply the same volatge from a variable pot to adc to check its working the display shows the correct value.
but when i merge my analog stage with the adc , the display show huge diffreence in the value.
i tried everything like adding decoupling capacitors and rc filters on adc input but still no change.
please help me out find the mistake.
i am designing a temperature controller with input range from
-8.825mV to 54.8mV . i have designed a opamp circuit in which i get a particular ouput volatge say 3.1volts. furthur i have to give this input to the adc and to 8051.
now my problem is when i test the output of the analog stage it gives me correct value. and when i apply the same volatge from a variable pot to adc to check its working the display shows the correct value.
but when i merge my analog stage with the adc , the display show huge diffreence in the value.
i tried everything like adding decoupling capacitors and rc filters on adc input but still no change.
please help me out find the mistake.