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RE: AD8135 as input buffer for AD9235 ADC

Question asked by Dimoto on Feb 8, 2013
Latest reply on Feb 11, 2013 by Dimoto

We are using AD8135 as input buffer for AD9235 80 MS/s differential input ADC.

 

The problem appeared when we try to use it as a single ended input buffer to differential output.

Example: Vcomm = 0.8V (Vdd+ = 3.3V, Vdss = 0V).

Vin = 1V, we expect:

+OUT to be 0.9V,

-OUT to be 0.7V

 

-OUT never goes below 0.8V.

To fix this we had to add negative supply. This is NOT mentioned in the specs!!!

 

Can you confirm, or we did something wrong?

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