Purpose of capacitor in the ICL7107 voltmeter circuit

AI Thread Summary
The 0.01 microfarad capacitor connected across pin 30 and pin 31 in the ICL7107 voltmeter circuit serves as a low-pass filter for the differential input voltage, helping to reduce high-frequency noise. This configuration is commonly implemented in typical circuit designs to enhance measurement accuracy. The cutoff frequency and filter order are relevant parameters that can further define the filter's performance. Understanding these aspects can help in optimizing the circuit for specific applications. The capacitor's role is crucial for maintaining stable readings in voltmeter circuits.
William loh
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Hi,

I was wondering what is the purpose of connecting 0.01 micro farad capacitor across pin 30 and pin 31 of the circuits http://www.electro-tech-online.com/custompdfs/2012/07/fn3082.pdf(page 11 to page 12 every typical circuit does connecting it) ?
I have tried to read through the datasheet but couldn't find the answer, guess you might know the answer. Thanks in advance.

William
 
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William loh said:
Hi,

I was wondering what is the purpose of connecting 0.01 micro farad capacitor across pin 30 and pin 31 of the circuits http://www.electro-tech-online.com/custompdfs/2012/07/fn3082.pdf(page 11 to page 12 every typical circuit does connecting it) ?
I have tried to read through the datasheet but couldn't find the answer, guess you might know the answer. Thanks in advance.

William

Looks to be a lowpass filter on the differential input voltage. Can you tell us what the cutoff frequency is and what order the filter is?
 
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