picstudent
New Member
Precision current sensing help please?
I am using a 13 bit ADC to measure the voltage across a shunt resistor.
The 0 to .1V DC is amplified and offset to .7 to 3.2 volts approximately (centered around 2.048V reference).
Now planning to implement a anti-alias filter before ADC or multiplexer .(I have 12 channels to measure)
To filter out noise (low pass filter ) what should be the cut off frequency?
also how much is the relevance of sampling frequency in my case where I am measuring a DC potential?
My code usually reads ADC in a round robbin fashion.Should we stick to a particular frequecy for sampling in this type of applications?
Thanks
Roy thomas
I am using a 13 bit ADC to measure the voltage across a shunt resistor.
The 0 to .1V DC is amplified and offset to .7 to 3.2 volts approximately (centered around 2.048V reference).
Now planning to implement a anti-alias filter before ADC or multiplexer .(I have 12 channels to measure)
To filter out noise (low pass filter ) what should be the cut off frequency?
also how much is the relevance of sampling frequency in my case where I am measuring a DC potential?
My code usually reads ADC in a round robbin fashion.Should we stick to a particular frequecy for sampling in this type of applications?
Thanks
Roy thomas
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