ST72C334J4TAE STMicroelectronics, ST72C334J4TAE Datasheet - Page 140

• Manufacturer Part Number: ST72C334J4TAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, ADC, 16-bit timers, SPI, SCI interfaces
• Manufacturer: STMicroelectronics

ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy
Figure 98. ADC Accuracy Characteristics
Notes:
1. ADC Accuracy vs. Negative Injection Current:
For I
1 LSB for each 10KΩ increase of the external analog source impedance. This effect on the ADC accuracy has been ob-
served 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.
140/150
Symbol
255
254
253
|E
|E
|E
E
E
7
6
5
4
3
2
1
O
G
T
D
INJ-
L
0
V
|
|
|
SSA
Digital Result ADCDR
= 0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of
DD
Total unadjusted error
Offset error
Gain Error
Differential linearity error
Integral linearity error
1
1LSB
E
supply, and worst case temperature.
O
2
IDEAL
3
1)
1)
=
Parameter
4
V
---------------------------------------- -
DDA
5
256
1 LSB
–
1)
1)
V
E
SSA
6
1)
T
IDEAL
E
7
L
(2)
E
A
D
= 25°C.
253 254 255 256
(3)
Typ.
f
V
CPU
DD
(1)
=5V,
=1MHz
E
G
Max
V
2.0
1.5
1.5
1.5
1.5
2)
DDA
(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.
Typ.
T
O
G
D
L
V
=Total Unadjusted Error: maximum deviation
=Integral Linearity Error: maximum deviation
f
=Differential Linearity Error: maximum deviation
=Offset Error: deviation between the first actual
=Gain Error: deviation between the last ideal
V
CPU
DD
in
(LSB
=5.0V,
=8MHz
IDEAL
Max
2.0
1.5
1.5
1.5
1.5
3)
)
Typ
V
f
CPU
DD
=3.3V,
=8MHz
Max
2.0
1.5
1.5
1.5
1.5
3)
Unit
LSB