Datasheet

– Gain = 2, LSB = (1.5V / 4096) = 366 μV
–
Gain = 4, LSB = (750 mV / 4096) = 183 μV
• Differential (DIFF) (ex: V
VREFP
= 3.0V)
– Gain = 1, LSB = (6.0V / 4096) = 1465 μV
– Gain = 2, LSB = (3.0V / 4096) = 732 μV
– Gain = 4, LSB = (1.5V / 4096) = 366 μV
The data include the AFE performances, as the PGA and AFE core cannot be separated. The temperature and
voltage dependency are given as separate parameters.
59.8.4.4 Gain and Offset Errors
For:
• a given gain error: E
G
(%)
• a given ideal code (C
i
)
• a given offset error: E
O
(LSB of 12 bits)
in 12-bit mode, the actual code (C
A
) is calculated using the following formula


=
1 +


100
× 

 2047 + 2047 + 

For higher resolutions, the code can be extended to the corresponding resolution defined by RES.
59.8.4.4.1 Differential Mode
In Differential mode, the offset is defined when the differential input voltage is zero.
Figure 59-13. Gain and Offset Errors in Differential Mode
V
IN
Differential
2047
V
VREFP
/2
0
-V
VREFP
/2
-2048
AFE codes
0
E
G
=(E
FS+
)-(E
FS-
)
E
FS+
E
O
=Offset error
E
FS-
where:
•
Full-scale error E
FS
=(E
FS+
)-(E
FS-
), unit is LSB code
• Offset error E
O
is the offset error measured for V
IN
=0V
• Gain error E
G
=100 × E
FS
/4096, unit in %
The error values in the tables below include the sample-and-hold error as well as the PGA gain error.
59.8.4.4.2 Single-ended Mode
The figure below illustrates the AFE output code relative to an input voltage V
IN
between 0V (Ground) and V
VREFP
.
The AFE is configured in Single-ended mode by connecting internally the negative differential input to V
VREFP
/2. As
the AFE continues to work internally in Differential mode, the offset is measured at V
VREFP
/2. The offset at V
INP
=0 can
be computed using the transfer function and the corresponding E
G
and E
O
.
SAM E70/S70/V70/V71 Family
Electrical Characteristics for SAM E70/S70
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1882