AN4369

Overal error

DocID025335 Rev 1

11/14

The error on Vout due to gain error (i.e. the error on the output) is:

So, εVog = 18.18 V/V * 8.14 % * 50e-3 V = 74 mV

The error due to the mismatch of the external resistances Rsi is:

So, εVio = 0.15 mV

The error on the output voltage is:

So,

εTot = 77 mV

This result shows that, at 125 °C, an added resistance of 500 Ω (representing temperature

coefficient, process variation, and mismatch) can add an error up to 77 mv on the output

voltage compared to the theoretical Vout. The inherent error of the TSC103, which has a

gain accuracy of 4 %, must also be taken into account when calculating the total error on

the output voltage.