Datasheet

ST7LITE0xY0, ST7LITESxY0
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ADC CHARACTERISTICS (Cont’d)
Figure 84. ADC Accuracy Characteristics with Amplifier disabled
Figure 85. ADC Accuracy Characteristics with Amplifier enabled
Note: When the AMPSEL bit in the ADCDRL register is set, it is mandatory that f
ADC
be less than or equal
to 2 MHz. (if f
CPU
=8MHz. then SPEED=0, SLOW=1).
E
O
E
G
1LSB
IDEAL
1LSB
IDEAL
V
DDA
V
SSA
–
256
-----------------------------------------=
V
in
(LSB
IDEAL
)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E
T
=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
E
O
=Offset Error: deviation between the first actual
transition and the first ideal one.
E
G
=Gain Error: deviation between the last ideal
transition and the last actual one.
E
D
=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
E
L
=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
Digital Result ADCDR
255
254
5
4
3
2
1
0
7
6
1234567
253 254 255 256
(1)
(2)
E
T
E
D
E
L
(3)
V
DDA
V
SSA
253
E
O
E
G
1LSB
IDEAL
V
in
(LSB
IDEAL
)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E
T
=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
E
O
=Offset Error: deviation between the first actual
transition and the first ideal one.
E
G
=Gain Error: deviation between the last ideal
transition and the last actual one.
E
D
=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
E
L
=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
n=Amplifier Offset
Digital Result ADCDR
n+5
n+4
n+3
n+2
n+1
0
n+7
n+6
1234567
100 101 102 103
(1)
(2)
E
T
E
D
E
L
(3)
250 mVV
SS