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| ST72325XXX Datasheet, PDF (222/243 Pages) STMicroelectronics – SCI asynchronous serial interface | |||
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Electrical characteristics
ST72325xxx-Auto
19.12.3 ADC accuracy
Table 138. ADC accuracy
Symbol
Parameter(1)
Conditions
Max(2)
Typ 48/60 Kbyte 16/32 Kbyte Unit
Flash
Flash
|ET| Total unadjusted error
3
4
6
|EO| Offset error
|EG| Gain error
2
3
VDD = 5V(1)
CPU in run mode @ fADC 2 MHz
0.5
3
|ED| Differential linearity error
1
2
|EL| Integral linearity error
5
4.5
LSB
2
3
1. ADC Accuracy versus Negative Injection Current: Injecting negative current may reduce the accuracy of the conversion
being performed on another analog input. Any positive injection current within the limits specified for IINJ(PIN) and ïIINJ(PIN)
in Section 19.8 does not affect the ADC accuracy.
2. Data based on characterization results, monitored in production to guarantee 99.73% within ± max value from -40°C to
125°C (± 3ï³ï distribution limits).
t(s) Figure 99. ADC error classification
roduc 1023
P 1022
1021
olete 7
bs 6
O 5
- 4
t(s) 3
2
c 1
Digital Result ADCDR
1LSBIDEAL
=
-V----A----R-----E----F------â----V----S-----S----A---
1024
(2)
ET
EO
EL
1 LSBIDEAL
rodu 0
1234567
Obsolete P VSSA
EG
(3)
(1)
ED
Legend:
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
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.
1021 1022 1023 1024
VAREF
Vin (LSBIDEAL)
222/243
Doc ID 13770 Rev 3
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