ST72521AR9TC View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST72521AR9TC
STMicroelectronics
ST72521AR9TC Datasheet PDF : 199 Pages
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ST72521M/R/AR
10-BIT ADC CHARACTERISTICS (Cont’d)
12.12.1 ADC Accuracy
Conditions: VDD=5V
Symbol
Parameter
|ET| Total unadjusted error1)
EO Offset error 1)
EG Gain Error 1)
|ED| Differential linearity error 1)
|EL| Integral linearity error 1)
Conditions
CPU in run mode @ fADC 2 MHz.
CPU in run mode @ fADC 2 MHz.
Typ Max Unit
4
3
3.52)
-0.5
-22)
LSB
1.5
4.52)
1.5
4.52)
Notes:
1. Injecting negative current on any of the analog input pins significantly reduces the accuracy of any conversion being
performed on any analog input.
Analog pins can be protected against negative injection by adding a Schottky diode (pin to ground). Injecting negative
current on digital input pins degrades ADC accuracy especially if performed on a pin close to the analog input pins.
Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 12.8 does not affect the ADC
accuracy.
2. Data based on characterization results, monitored in production.
Figure 114. ADC Accuracy Characteristics
1023
1022
1021
7
6
5
4
3
2
1
Digital Result ADCDR
1LSBIDEAL = -V----A----R-----E-1----F0----2-–---4-V----S-----S----A---
(2)
ET
EO
EL
1 LSBIDEAL
0
1234567
VSSA
EG
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
(3)
(1)
ED
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)
186/199
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