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ST72561 Datasheet(PDF) 249 Page - STMicroelectronics

Part # ST72561
Description  8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, LINSCI , ACTIVE CAN
PDF  262 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72561 Datasheet(HTML) 249 Page - STMicroelectronics

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ADC CHARACTERISTICS (Cont’d)
ADC Accuracy with fCPU=8 MHz, fADC=4 MHz RAIN< 10kΩ, VDD= 5V
Figure 148. ADC Accuracy Characteristics
Notes:
1) ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) analog
input pins should be avoided as this significantly reduces the accuracy of the conversion being performed on another
analog input. It is recommended to add a Schottky diode (pin to ground) to standard analog pins which may potentially
inject negative current. The effect of negative injection current on robust pins is specified in Section 12.9.
Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 12.9 does not affect the ADC
accuracy.
Symbol
Parameter
Conditions
Typ
Max
Unit
|ET|
Total unadjusted error 1)
4
LSB
|EO|
Offset error 1)
2.5
4
|EG|
Gain Error 1)
34
|ED|
Differential linearity error1)
1.5
2
|EL|
Integral linearity error 1)
1.5
2
EO
EG
1LSBIDEAL
1LSB
IDEA L
V
DDA
V
SSA
–
1024
-----------------------------------------
=
Vin (LSBIDEAL)
(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.
Digital Result ADCDR
1023
1022
1021
5
4
3
2
1
0
7
6
123
4567
1021 1022 1023 1024
(1)
(2)
ET
ED
EL
(3)
VDDA
VSSA



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