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AD8250 Reference Drive

Question asked by ack on Nov 29, 2014
Latest reply on Dec 3, 2014 by krisf

Hi All,

 

I am planning to use AD8250 as a part of ADC front end along with the AD8421 and AD8475. I get what i expected from AD8421 and AD8475 but not from AD8250 so far. I use the exact differential output scheme in AD8250s datasheet (page 20). Both in simulation and on board i get the same result which is the output offset voltage of AD8250; it is not anywhere near Vref.

 

I am attaching the simulation file (LTSpice), any suggestion?

 

Thank you in advance.

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