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AD5338: Difference in offset between channel 1 and channel 2 of the AD5338

Q 

Hello, by testing more or less 10  AD5338s I find an offset from 3mV to 17mV
only for 2nd channel VoutB (PIN3)
while VoutA (PIN2) has no offset. I tested the pin with no load. The amount of
offset is in the tolerance (from datasheet) but I don't understand why it is
present only on the 2nd channel.
Do you know some issue regarding a lower offset-performance for 2nd channel or
some external causes that can influence
the offset-perfomance?

 

A 

There is a different layout for different channels so the offset and gain can
be different. Each channel will not have the same offset and would need to
calibrated separately.
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