Offset adjustment on AD215 isolated amplifier

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
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I am planning to use AD215 for AC line voltage measurement for control. The
signal from the output of the AD215 needs to be routed to the input of an
analog to digital converter which is single sided converter (accepts signals
from 0 to 3V). My question is can I use TRIM pin on AD215 to adjust offset (by
adding an external resistor divider) so I can translate say bipolar input
signal from -1.5V to 1.5V to single sided output signal in range from 0 to 3 V?
My idea was to use additional OP AMP for this however, if this is possible to
be done with the AD215 than I would rather use that.

 

The trim adjustment will not provide enough range for this application. You may
want to add an offset to the input. I am attaching a modified version of figure
12 from the datasheet. I added a 1.5V offset and an offset adjustment. You may
also want to add some bypass capacitors to the + & - Viso supplies.

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