EFM32GG230 Datasheet, PDF (29/66 Pages) List of Unclassifed Manufacturers – High Performance 32-bit processor up to 48 MHz

Preliminary
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Symbol
Parameter
Condition
Min
Typ
Max
Unit
V_ADCOFFSET Offset voltage
200 kSamples/s, 12 bit, differ-
ential, 2xV_DD reference
After calibration, single ended
After calibration, differential
79
dBc
0.3
mV
0.3
mV
TGRAD_ADCTH
Thermometer output gradi-
ent
-1.92
-6.3
mV/°C
ADC
Codes/
°C
DNL_ADC
Differential non-linearity
(DNL)
±0.7
LSB
INL_ADC
Integral non-linearity (INL),
End point method
±1.2
LSB
MC_ADC
GAIN_ED
No missing codes
Gain error drift
1.25V reference
2.5V reference
11.999¹
12
0.01²
0.01²
bits
0.033³ %/°C
0.03³ %/°C
OFFSET_ED Offset error drift
1.25V reference
2.5V reference
0.2²
0.7³ LSB/°C
0.2²
0.62³ LSB/°C
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.
2_{Typical numbers given by abs(Mean) / (85 - 25).}
3_{Max number given by (abs(Mean) + 3x stddev) / (85 - 25).}
The integral non-linearity (INL) and differential non-linearity parameters are explained in Figure 3.13 (p.
29) and Figure 3.14 (p. 30) , respectively.
Figure 3.13. Integral Non-Linearity (INL)
Digital ouput code
4095
4094
4093
4092
INL= |[ (V_D-V_SS)/V_LSBIDEAL] - D| w here 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
2012-09-11 - EFM32GG230FXX - d0035_Rev1.00
29
Analog Input
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