Total Unadjusted Error; Figure 13. Total Unadjusted Error - ST STM32 Application Note

ADC errors
2.1.5

Total unadjusted error

The total unadjusted error (TUE) is the maximum deviation between the actual and the ideal
transfer curves. This parameter specifies the total errors that may occur, thus causing the
maximum deviation between the ideal digital output and the actual digital output. TUE is the
maximum deviation recorded between the ideal expected value and the actual value
obtained from the ADC for any input voltage.
The TUE is denoted by E
The TUE is not the sum of E
voltages whereas the gain error affects the digital output for higher voltages.
Example
If V
REF+
of 0x9B4 is obtained, the deviation may result from the offset since the DLE and ILE errors
occur simultaneously.
TUE = absolute (actual value – ideal case value) = 0x9B4 – 0x9B2 = 0x2 = 2 LSB
1. The total unadjusted error, E
16/49
. It is represented in
T
, E
O
= 3.3 V and V = 2 V, the ideal result is 0x9B2. However, if the conversion result
AIN

Figure 13. Total unadjusted error

, is shown in magenta.
T
Figure
, E , E . The offset error affects the digital result at lower
G L D
DocID15067 Rev 3
13.
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