ADC/DAC/VREF/Comparators
  millivolt measurement using adc

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Author Topic:   millivolt measurement using adc
knnandan841
New Member 		posted August 25, 2010 03:02 AM     Click Here to See the Profile for knnandan841   Click Here to Email knnandan841     Edit/Delete Message
hello
i am using 8051f005 developement kit.
one of my application requires measurement of sinewave(generated thruogh dac)to make the sinewave generator in closed loop.

In the measurements of adc, the variarion that should be measured and corrected is 1/1000 parts of the measuring voltage(eg:i want to measure 0.004mV variation in 4.4mV).

if i amplify to a reasonable level, the overall voltage increases beyong the ref. voltage
please give some technique to make measurement.

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erikm
Member 		posted August 25, 2010 07:15 AM     Click Here to See the Profile for erikm   Click Here to Email erikm     Edit/Delete Message
if i amplify to a reasonable level, the overall voltage increases beyong the ref. voltage
then it is not a "reasonable level"

set the gain to Vref/VinMax

Erik

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