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Re: About AD7740 question

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Hello,

 

The on chip reference is 2.5V typ but can vary from 2.3V to 2.7V. The device also has an offset of 7mV typ, 35 mV max and a gain error of 0.1% of span typ, 0.7% of span max. So, there will be some variation from part to part. The on-chip reference has a drift of 50 ppm/degC typ. So, the reference is not highly accurate. An external reference would be lower drift and has better initial accuracy so would give better matching between ICs.


Regards,

Mary.


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