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ADA4927 with common mode

Question asked by manlong on Feb 20, 2012
Latest reply on May 25, 2012 by manlong

     Hello,

 

I want to use you product to drive a ADC with a common mode.

My design is

Capture.PNG

The CMIRef is the output common mode of the ADC. The left SMA is the input and the right sma are the output.

I supply the product with V+=+5V and V-=0V. R15 and R7 in red is not fitted

I think i respect your recommandation to design it but the output will decrease an lost 3dBm at 400MHz.

In your datasheet, the product have a bandwith more than 1GHz.

The output swing is about 500mVpp.

Do you know why I have only a bandwith of 400MHz instead of more than 1GHz?

 

Thank you

 

Best Regards

 

Man Long

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