afaustas

AD7622 ADC precision when used unipolar input

Discussion created by afaustas on Aug 28, 2016
Latest reply on Aug 29, 2016 by Gnib

Hi,

we use AD7622 ADC for our project. This chip has a difereintial input but we need unipolar. In the datasheet I found a circuit for conversion of unipolar signal to diferential, which is required for the ADC:

We see that here a precision of the resistors is critical, but in the datasheet we did not found any information about that. And we know that even the 1% precision resistors carries a big error.

How we could convert a Single-Ended input to differential without losing a precision?

 

Thanks in advance.

 

Regards,

Faustas

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