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AD5272BRMZ-50 tolerance 15%

Thread Summary

The user inquired about a 15% normal mode tolerance in the AD5272 datasheet, noting one of three units showed a significantly larger output waveform. The final answer clarified that the 15% tolerance applies outside Performance (R-Perf) Mode. The user confirmed the issue was resolved after testing with a fixed resistor and swapping the potentiometers, suggesting the problem was related to the specific AD5272 unit or configuration.
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Category: Hardware
Product Number: AD5272

Could someone please elaborate on what 15% normal mode tolerance implies in below listed datasheet section.

We have one of the three units showing significantly larger OUT waveform than what would be consistent with 1% components and 1% digipot value.  We have the digipots in each unit configured identically near mid point to achieve what we interpret as 1% value based on your tables for 1% codes. 

Inputs (IN) to op-amp on each unit is very near identical but OUT on one of the units is noticeably larger, implying gain is larger.   Digipots A and W terminals are connected in inverting op-amp as shown below.

Moreover, when i replace the digipot with a fixed 25.5k resistor, I get consistent output across all three units.

Is this expected behavior?

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