ST72F63 STMICROELECTRONICS [STMicroelectronics], ST72F63 Datasheet - Page 120

• Manufacturer Part Number: ST72F63
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7263B
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy with V
Figure 79. ADC Accuracy Characteristics
Notes:
1. ADC Accuracy vs. Negative Injection Current:
For I
for each 10K
under worst-case conditions for injection:
- negative injection
- injection to an Input with analog capability, adjacent to the enabled Analog Input
- at 5V V
2. Data based on characterization results with T
3. Data based on characterization results over the whole temperature range, monitored in production.
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Symbol
255
254
253
|E
|E
|E
E
E
7
6
5
4
3
2
1
O
G
INJ-
T
D
L
0
V
|
|
|
SSA
=0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 1 LSB
Digital Result ADCDR
DD
Total unadjusted error
Offset error
Gain Error
Differential linearity error
Integral linearity error
1
1LSB
E
supply, and worst case temperature.
O
increase of the external analog source impedance. This effect on the ADC accuracy has been observed
2
IDE AL
3
1)
1)
=
4
V
---------------------------------------- -
DD
DDA
=5V, f
Parameter
5
256
1 LSB
–
1)
1)
V
E
SSA
6
1)
T
IDEAL
CPU
E
7
L
=8 MHz, f
(2)
E
A
D
=25°C.
253 254 255 256
(3)
ADC
=4 MHz R
(1)
E
G
V
DDA
AIN
< 10
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E
between the actual and the ideal transfer curves.
E
transition and the first ideal one.
E
transition and the last actual one.
E
between actual steps and the ideal one.
E
between any actual transition and the end point
correlation line.
Min
-0.5
-1.5
T
O
G
D
L
=Total Unadjusted Error: maximum deviation
=Integral Linearity Error: maximum deviation
=Differential Linearity Error: maximum deviation
=Offset Error: deviation between the first actual
=Gain Error: deviation between the last ideal
V
k
in
(LSB
IDEAL
)
Max
1.5
1.5
2
1
0