ST7265XEVALMS STMicroelectronics, ST7265XEVALMS Datasheet - Page 150

• Manufacturer Part Number: ST7265XEVALMS
• Manufacturer: STMicroelectronics

Specifications of ST7265XEVALMS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

ST7265x
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy
Figure 94. 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
255
254
253
|E
|E
E
E
E
7
6
5
4
3
2
1
INJ-
G
D
T
0
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
Offset Error
Gain Error
Differential linearity error
Integral linearity error
Total Unadjusted Error
1
1LSB
supply, and worst case temperature.
E
O
2
Parameter
IDEAL
3
1)
=
V
---------------------------------------- -
4
DDA
5
256
1 LSB
–
1)
V
1)
E
SSA
6
1)
T
IDEAL
E
7
L
Conditions ⇒
(2)
E
A
⇓
D
=25°C.
253 254 255 256
(3)
(1)
E
G
V
f
CPU
DD
Min
-0.5
-2.0
V
DDA
=5.5V,
=1MHz
(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.
Max
T
O
G
D
L
2)
2.5
1.5
1.5
2.5
=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
0
in
(LSB
V
f
CPU
IDEAL
DD
Min
-1.0
-2.0
=5.0V,
=8MHz
)
Max
3)
2.5
1.5
1.5
2.5
1)
0
V
f
CPU
DD
Min
-1.0
-2.0
=3.3V,
=8MHz
Max
3)
2.5
1.5
3.0
1.5
1)
0