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AD8338 minimum capacitance on DETO for AGC

Question asked by chenc on Feb 4, 2016
Latest reply on Jun 20, 2016 by JinoL

I am just starting to test out AD8338 as an amplifier with automatic gain control. I want the gain to change relatively fast, like within 100us of seeing a large input signal. Initially I tried 1nF and it was turning down the gain within about 500us, so I thought I would try 220pF. But then the DETO output would oscillate. I wonder if anyone knows what is the minimum capacitance you can use for setting the response time of the AGC?

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