when operating a AD8436 in the test configuration described in the datasheet Fig. 21 ( see attachment ) , I observe the following:
When increasing the input amplitude up ~400 mVrms I see the expected output value ( +- 1 mV ) . When increasing the input amplitude further the output value starts to drop slowly. At a value of 1500mVrms input voltage the output has a value of 1480 mV DC.
* supply is -5 to +5
* circuit is built on a bread board
* I see the behaviour for two different chips
* I see the behaviour with and without the input FET buffer
Any advice how to improve this situation is highly appreciated!