ST7FMC1K2B3 STMICROELECTRONICS [STMicroelectronics], ST7FMC1K2B3 Datasheet - Page 284

• Manufacturer Part Number: ST7FMC1K2B3
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7MC1xx/ST7MC2xx
10-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy with V
Notes:
1. ADC Accuracy vs. Negative Injection Current: Injecting negative current may reduce the accuracy of the conversion
being performed on another analog input. The effect of negative injection current on analog pins is specified in
12.14.
Any positive injection current within the limits specified for I
accuracy.
2. Data based on characterization results, monitored in production to guarantee 99.73% within ± max value from -40°C
to 125°C (± 3σ distribution limits).
Figure 161. ADC Accuracy Characteristics
Notes:
1. ADC Accuracy vs. Negative Injection Current:
For I
for each 10KΩ increase of the external analog source impedance. This effect on the ADC accuracy has been observed
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
1023
1022
1021
|E
|E
|E
|E
|E
7
6
5
4
3
2
1
INJ-
O
G
0
D
V
T
L
|
|
|
|
|
SSA
=0.8mA, the typical leakage induced inside the die is 1.6µA and the effect on the ADC accuracy is a loss of 4 LSB
Digital Result ADCDR
DD
1LSB
1
Total unadjusted error
Offset error
Gain Error
Differential linearity error
Integral linearity error
supply, and worst case temperature.
E
O
IDEAL
2
3
=
1)
1)
V
---------------------------------------- -
Parameter
DDA
4
DD
1024
=5.0V
–
5
1 LSB
V
SSA
1)
1)
E
6
T
IDEAL
1)
E
7
L
(2)
E
A
D
=25°C.
V
f
ADC
1021 1022 1023 1024
AREF
(3)
=4MHz, R
=3.0V to 5.0V, f
INJ(PIN)
(1)
Conditions
E
G
V
AIN
AREF
and ΣI
<10kΩ
(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.
CPU
INJ(PIN)
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
=8MHz,
V
in
(LSB
in
Section 12.8
IDEAL
)
Typ
2.5
4
2
2
2
does not affect the ADC
Max
4.5
4.5
4
4
2)
Unit
LSB
Section