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AD8436  - Output not linear to Input

Question asked by PeterT on May 10, 2014
Latest reply on May 20, 2014 by PeterT

Hello,

 

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!

 

Thank you

Peter

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