EFM32ZG222 Datasheet, PDF (33/66 Pages) Silicon image – Energy, gas, water and smart metering

Preliminary
Figure 3.24. Integral Non-Linearity (INL)
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Digital ouput code
4095
4094
4093
4092
INL= | [(V_D- V_SS)/ V_LSBIDEAL] - D| where 0 < D < 2^N - 1
Actual ADC
tranfer function
before offset and
gain correction
Actual ADC
tranfer function
after offset and
gain correction
INL Error
(End Point INL)
3
Ideal transfer
curve
2
1
VOFFSET
0
Figure 3.25. Differential Non-Linearity (DNL)
Analog Input
Di g i t al
ouput
code
4095
4094
4093
4092
5
4
3
2
1
0
DNL= | [(V_{D+ 1} - V_D)/ V_LSBIDEAL] - 1| where 0 < D < 2^N - 2
Full Scale Range
Example: Adjacent
input value VD+ 1
corrresponds to digital
output code D+ 1
Example: Input value
VD corrresponds to
digital output code D
Actual transfer
function with one
missing code.
Ideal transfer
curve
Code width = 2 LSB
DNL= 1 LSB
0.5
LSB
Ideal spacing
between two
adjacent codes
VLSBIDEAL= 1 LSB
Ideal 50%
Transition Point
Ideal Code Center
Analog Input
2013-10-09 - EFM32ZG222FXX - d0066_Rev0.60
33
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