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What type of ADC amp front end is better soultion

Question asked by UV100 on Jan 9, 2015
Latest reply on Jan 12, 2015 by JinoL

Hi All

 

I am designing a front end for an Audio A2D who required differential input from a single ended source, I am  considering 2 approach for the front end :

the first approach is to use a discrete 3 OP-AMP who convert a single ended (audio source) into a differential signal required by the A2D

 

The 2nd approach is to use one fully differential OP-AMP like the AD8138 using the as an input and the(-) connected to GND.

 

Both design is powered by +/- 15V and 2.5V reference

 

Please help me to choose the best approach from the S/N and quality point of view.

 

Thank you

 

Yuval

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