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AD8310 log amp sensitivity clarification needed

Question asked by Spacerowa on Oct 18, 2016
Latest reply on Oct 20, 2016 by Spacerowa

In the AD8310 data sheet Rev. F 6/10 the sensitivity ( slope ) is stated in several places, but with different values being given, i.e., 20, 22, 24, 25 and 26mV/dB.

I calculate that for a dc output voltage 1.8V, slopes in the range 20 to 26mV/db give a input voltage range of -18 to-39dBV.

The conversion from Vout to input dBV is essential and has to me made, but the uncertainty in slope is a problem for an acceptable tolerance on input dBV.

In my application I am currently using 24mV/dB slope. But what slope should I choose and on what basis ? Does anyone have an opinion on this ?