AD536: Using a potential divider

Document created by analog-archivist Employee on Feb 23, 2016
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For simplicity I wish to use a potential divider to attenuate the I/P signal,
using the I/P impendance of the AD536, and need to know if this is a constant
value, or changes with voltage, temperature etc.


The input resistance has huge ( worst case +/-20%) variation from part to part.
Having said that, the device is internally trimmed and the on chip resistors
have a fundamental temperature stability of approximately 50ppm/deg. In
addition, it shouldn't have any supply voltage dependency.

So you need a trimmable resistor to get accurate gain but once it is set it
shouldn't drift too much with T.