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Sum of all cells attenuation

Category: Datasheet/Specs
Product Number: LTC6811-1

The datasheets of the LTC6811 mentions an attenuation of 1:20 for the sum of all cells voltage measurement.

How exact is this 1:20?

Over 7000 samples we see a very small but constant measurement error that could be explained if the attenuation is 1:19.98 instead instead of 1:20.

Rounding this number results in 1:20 so the datasheet matches the observations.

I'am curious to what the exact attentuation is by design, or if we need to look into other causes for this very small error.