AGC output too high noise when no input

Question

AD8338 in AGC mode.When there is no input signal,AD8338 output MAX noise signal.How to solve?Thanks!

jeobico · Accepted Answer

Hi WKD 
 With the input pins that are floating, external noise can be detected by the input pins and can result in high noise. 
 There are two great articles to discuss this issue. 
 https://www.analog.com/en/resources/technical-articles/avoiding-noise-and-power-problems-with-unused-op-amps.html 
 https://www.analog.com/en/resources/analog-dialogue/raqs/raq-issue-46.html 
 Hope this helps. 
 Thanks and regards, 
 JE)

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AGC output too high noise when no input

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