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ADA4950 BW and Vocm Questions for Design

Can you provide advice for proper design considerations for the following questions:

1) The signal we're passing is only operating between 20Hz and 15Mhz.  Would reducing the Bandwidth of the device help prevent oscillations, and if so what would you recommend as the best method of rolling off excess Bandwidth?

2) We are passing a signal that we'll always be centered around 0V (no DC offset).  

   a) Do you recommended tying Vocm to 0V to be certain we meet this condition independent of the power supply rails?  

   b) Is tying directly to 0V sufficient or do we need to have some other impedance?

We are operating with a gain of 1.

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