Datasheet

1441
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
Differential Mode
In differential mode, the offset is defined when the differential input voltage is zero.
Figure 47-15. Gain and Offset Errors in Differential 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 47-35 and Table 47-36 include the sample and hold error as well as the PGA gain error.
Table 47-35. Differential Gain Error E
G
Gain Mode 0.5 1 2
Auto Correction No Yes No Yes No Yes
Average Gain Error (%) -0.107 0.005 0.444 0.112 0.713 0.005
Standard Deviation (%) 0.410 0.210 0.405 0.229 0.400 0.317
Gain Min Value (%) -1.338 -0.625 -0.771 -0.576 -0.488 -0.947
Gain Max Value (%) 1.123 0.635 1.660 0.801 1.914 0.957
Table 47-36.
Differential Output Offset Error E
O
Gain 0.5 1 2
Average Offset Error (LSB) -1.2 -1.2 -0.6
Standard Deviation (LSB) 0.3 0.4 0.4
Offset Min value (LSB) -2.1 -2.4 -1.8
Offset Max value (LSB) -0.3 0 0.6
Vin differential
4095
ADVREF/2
-ADVREF/2
0
0
ADC codes
FSe-
Eo=Offset error
2047
FSe+