ST72321XX Datasheet, PDF (219/243 Pages) STMicroelectronics – PLL for 2x frequency multiplication

ST72321xx-Auto
Electrical characteristics
19.12.3
ADC accuracy
Conditions: V_DD = 5V⁽¹⁾
Table 136. ADC accuracy
Symbol
Parameter⁽¹⁾
Conditions
Typ Max⁽²⁾ Unit
|E_T| Total unadjusted error
3
4
|E_O| Offset error
2
3
|E_G| Gain error
CPU in run mode @ f_ADC 2 MHz
0.5
3 LSB
|E_D| Differential linearity error
|E_L| Integral linearity error
1
2
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 I_INJ(PIN) and I_INJ(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 (± 3distribution limits).
Figure 101. ADC error classification
1023
1022
1021
7
6
5
4
3
2
1
Digital Result ADCDR
1LSBIDEAL
=
-V----A----R-----E----F------^–----V----S-----S----A---
1024
(2)
E_T
E_O
E_L
1 LSB_IDEAL
0
1234567
V_SSA
E_G
(3)
(1)
E_D
Legend:
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E_T = Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
E_O = Offset Error: deviation between the first
actual transition and the first ideal one.
E_G = Gain Error: deviation between the last ideal
transition and the last actual one.
E_D = Differential Linearity Error: maximum
deviation between actual steps and the ideal
one.
E_L = Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
1021 1022 1023 1024
V_AREF
V_in (LSB_IDEAL)
Doc ID 13829 Rev 1
219/243