EFM32G222 Datasheet, PDF (36/68 Pages) Silicon Laboratories – Wake-up Interrupt Controller

...the world's most energy friendly microcontrollers
Symbol
Parameter
Condition
Min
Typ
Max
Unit
200 kSamples/s, 12 bit, differ-
ential, 5V reference
78
dBc
V_ADCOFFSET Offset voltage
200 kSamples/s, 12 bit, differ-
ential, V_DD reference
200 kSamples/s, 12 bit, differ-
ential, 2xV_DD reference
After calibration, single ended
After calibration, differential
68
79
79
-4
0.3
0.3
dBc
dBc
4 mV
mV
TGRAD_ADCTH
Thermometer out-
put gradient
-1.92
-6.3
mV/°C
ADC
Codes/
°C
DNL_ADC
Differential non-lin- V_DD = 3.0 V, external 2.5V ref-
earity (DNL)
erence
-1
±0.7
4 LSB
INL_ADC
Integral non-linear-
ity (INL), End point
method
V_DD = 3.0 V, external 2.5V ref-
erence
±1.2
±3 LSB
MC_ADC
No missing codes
11.999¹
12
bits
1_{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}
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. 37) , respectively.
Figure 3.27. Integral Non-Linearity (INL)
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
2015-05-22 - EFM32G222FXX - d0033_Rev1.90
36
Analog Input
www.silabs.com