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Figure 54-5. ADC Analog Input AINx
The minimum sampling time t
samplehold
for a given R
source
can be found using a general formula:
samplehold
sample
+
source
×
sample
× + 2 × ln 2
For 12-bit accuracy, this turns into:
samplehold
sample
+
source
×
sample
× 9.7
where
samplehold
1
2 ×
ADC
.
Table 54-25. Differential Mode
(1)
Symbol
Parameter Conditions
Measurement
Unit
Min Typ Max
ENOB Effective Number of bits Fadc = 1Msps - R2R disabled
Vddana=3.0V Vref=Vddana 10.5 10.8 11.2
bits
Vddana=3.0V ExtVref=2.0V 10.5 10.8 11.0
TUE Total Unadjusted Error (2) Fadc = 1Msps - R2R disabled
Vddana=3.0V Vref=Vddana - +/-2.3 +/-5.2
LSB
Vddana=3.0V ExtVref=2.0V - +/-2.7 +/-5.6
INL Integral Non Linearity Fadc = 1Msps - R2R disabled
Vddana=3.0V Vref=Vddana - +/-1.2 +/-1.5
Vddana=3.0V ExtVref=2.0V - +/-1.2 +/-1.5
DNL Differential Non Linearity Fadc = 1Msps - R2R disabled
Vddana=3.0V Vref=Vddana - +/-0.98 -1/+1
Vddana=3.0V ExtVref=2.0V - +/-0.95 -1/+1
Gain
Gain Error with REFCTRL.REFCOMP=1 Fadc = 1Msps
Vddana=3.0V Vref=Vddana -0.18 -0.02 +0.16
%
Vddana=3.0V ExtVref=2.0V -0.09 +0.03 +0.18
Vddana=3.0V 1V internal Ref -4.3 -1 +1.8
Vddana=3.0V Vref=Vddana/2 -0.35 +0.2 +0.65
Gain Error with REFCTRL.REFCOMP=0 Fadc = 1Msps
Vddana=3.0V Vref=Vddana -0.2 -0.001 +0.16
Vddana=3.0V ExtVref=2.0V -0.74 -0.05 0.66
Vddana=3.0V 1V internal Ref -4.9 -1 +1.6
Vddana=3.0V Vref=Vddana/2 -1 +0.11 +1
Offset
Offset Error with SAMPCTRL.OFFCOMP=1 Fadc = 1Msps
Vddana=3.0V Vref=Vddana -2.9 -0.3 +2.4
mV
Vddana=3.0V ExtVref=2.0V -2.6 -0.2 +2.1
Vddana=3.0V 1V internal Ref -2.3 -0.2 +2.3
Vddana=3.0V Vref=Vddana/2 -2.9 -0.3 +2.6
Offset Error with SAMPCTRL.OFFCOMP=0 Fadc = 1Msps
Vddana=3.0V Vref=Vddana -9.5 +0.03 +9.9
Vddana=3.0V ExtVref=2.0V -9.9 -0.03 +9.8
Vddana=3.0V 1V internal Ref -5 +0.5 -5
Vddana=3.0V Vref=Vddana/2 -10.8 +0.5 +11.3
SAM D5x/E5x Family Data Sheet
Electrical Characteristics at 85°C
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 2003