Datasheet

1136
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
Single-ended Mode
Figure 44-15 illustrates the ADC output code relative to an input voltage V
IN
between 0V (Ground) and V
ADVREF
. The ADC
is configured in Single-ended mode by connecting internally the negative differential input to V
ADVREF
/2. As the ADC
continues to work internally in Differential mode, the offset is measured at V
ADVREF
/2.
Figure 44-15. Gain and Offset Errors in Single-ended Mode
where:
 FSe=(FSe+)-(FSe-) is for full-scale error, unit is LSB code
 Offset error E
O
is the offset error measured for V
IN
=0V
 Gain error E
G
=100xFSe/4096, unit in %
The error values in Table 44-45 and Table 44-46 include the sample and hold error as well as the PGA gain error.
Vin Single Ended
4095
ADVREF/2
ADVREF
0
0
ADC codes
FSe-
Eo=Offset error
2047
FSe+
Table 44-45. Single-ended Gain Error
Offset Mode OFFx=0 OFFx=0 OFFx=1 OFFx=0 OFFx=1
Gain Mode 1 2 2 4 4
AutoCorrection
No Yes No Yes No Yes No Yes No Yes
Average Gain Error (%) 0.449 0.078 0.771 -0.010 0.781 0.117 1.069 -0.029 1.064 0.151
Standard Deviation (%) 0.420 0.200 0.430 0.313 0.425 0.327 0.420 0.415 0.415 0.371
Min Value (%) -0.811 -0.522 -0.518 -0.947 -0.493 -0.864 -0.190 -1.274 -0.181 -0.962
Max Value (%) 1.709 0.679 2.061 0.928 2.056 1.099 2.329 1.216 2.310 1.265
Table 44-46. Single-ended Output Offset Error
Offset Mode OFFx=0 OFFx=0 OFFx=1 OFFx=0 OFFx=1
Gain 1 2 2 4 4
Average Offset Error
(LSB)
-5.7 -7.7 -10.3 -7.3 -18.7
Standard Deviation (LSB) 1.8 3.9 3.4 6 7
Min Value (LSB) -11.1 -19.4 -20.5 -25.3 -39.7
Max Value (LSB) -0.3 4 -0.1 10.7 2.3