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AD8295 to AD7690 Reference Design Problem

Question asked by thutches on Jul 12, 2012
Latest reply on Jul 12, 2012 by harryh

I recently built the reference design included with the AD8295 datasheet, which uses the AD8295 to differentially drive an AD7690 ADC chip.  This is a very compact implementation but I can't seem to get it to work correctly.

 

That said, I notice that the evaluation board for the AD8295, EVAL-CN0225, implements a different approach using an AD8275 to generate the differential signal driving an AD7687. I'm not able to find any confirming implementations for the AD8295/AD7690 combination but I haven't seen any web references suggesting that the design has any problem or needs additional components.

 

I have attached my schematic of the amplifier section.  I have four of these channels in a compact area that is space constrained.

 

Can anyone comment on this in general?  I can be more specific later.

 

Tim

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