efm32g890 ETC-unknow, efm32g890 Datasheet - Page 36

• Manufacturer Part Number: efm32g890
• Description: Ic Microcontroller
• Manufacturer: ETC-unknow

2010-12-17 - d0010_Rev1.20
1
the set {-3, -2, -1, 1, 2, 3}. There will be no missing code around 2048, and in spite of the missing code the ADC will be monotonic
at all times so that a response to a slowly increasing input will always be a slowly increasing output. Around the one code that is
missing, the neighbour codes will look wider in the DNL plot. The spectra will show spurs on the level of -78dBc for a full scale
input for chips that have the missing code issue.
The integral non-linearity (INL) and differential non-linearity parameters are explained in Figure 3.27 (p.
36) and Figure 3.28 (p. 36) , respectively.
Figure 3.27. Integral Non-Linearity (INL)
Figure 3.28. Differential Non-Linearity (DNL)
On the average every ADC will have one missing code, most likely to appear around 2048 +/- n*512 where n can be a value in
Symbol
MC
ADC
Parameter
No missing codes
Digital ouput code
4095
4094
4093
4092
3
2
1
0
Digital
ouput
code
4095
4094
4093
4092
5
4
3
2
1
0
Actual ADC
tranfer function
before offset and
gain correction
INL= | [(V
0.5
LSB
Ideal transfer
curve
DNL= | [(V
Condition
Example: Input value
V
digital output code D
D
Ideal Code Center
corrresponds to
D
- V
Ideal transfer
curve
D+ 1
Full Scale Range
SS
Ideal 50%
Transition Point
)/ V
- V
...the world's most energy friendly microcontrollers
Example: Adjacent
input value V
corrresponds to digital
output code D+ 1
V
LSBIDEAL
36
D
OFFSET
)/ V
Ideal spacing
between two
adjacent codes
V
LSBIDEAL
LSBIDEAL
] - D| where 0 < D < 2
D+ 1
= 1 LSB
INL Error
(End Point INL)
] - 1| where 0 < D < 2
Code width = 2 LSB
DNL= 1 LSB
Actual ADC
tranfer function
after offset and
gain correction
Min
Analog Input
11.999
Analog Input
Actual transfer
function with one
m issing code.
1
Typ
N
N
- 1
www.energymicro.com
- 2
12
Max
Unit
bits