ST72652C4T1 Ver la hoja de datos (PDF) - STMicroelectronics
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ST72652C4T1
STMicroelectronics
ST72652C4T1 Datasheet PDF : 166 Pages
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ST7265x
8-BIT ADC CHARACTERISTICS (Cont’d)
ADC Accuracy
Symbol
Parameter
⇒ Conditions
⇓
ET Total Unadjusted Error 1)
E0 Offset Error
EG Gain Error 1)
|ED| Differential linearity error 1)
|EL| Integral linearity error 1)
Figure 105. ADC Accuracy Characteristics
VDD=5.5V, 2)
fCPU=1MHz
Min Max
2.5
-0.5
1.5
-2.0
0
1.5
2.5
VDD=5.0V, 3)
fCPU=8MHz 1)
Min Max
2.5
-1.0
1.5
-2.0
0
1.5
2.5
VDD=3.3V, 3)
fCPU=8MHz 1)
Min Max
2.5
-1.0
1.5
-2.0
0
1.5
3.0
Digital Result ADCDR
255
254
253
1LSBIDEAL
=
-V----D-----D----A------–----V-----S----S-----A--
256
EG
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
7
6
5
EO
4
3
2
1
(2)
ET
(3)
(1)
EL
ED
1 LSBIDEAL
ET=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
EO=Offset Error: deviation between the first actual
transition and the first ideal one.
EG=Gain Error: deviation between the last ideal
transition and the last actual one.
ED=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
EL=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
0
1234567
VSSA
253 254 255 256
VDDA
Vin (LSBIDEAL)
Notes:
1. ADC Accuracy vs. Negative Injection Current:
For IINJ-=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
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 VDD supply, and worst case temperature.
2. Data based on characterization results with TA=25°C.
3. Data based on characterization results over the whole temperature range, monitored in production.
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