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ST7SB20J/US 데이터시트(PDF) 138 Page - STMicroelectronics

부품명 ST7SB20J/US
상세설명  8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFACE
PDF  154 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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ST7SB20J/US 데이터시트(HTML) 138 Page - STMicroelectronics

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10-BIT ADC CHARACTERISTICS (Cont’d)
12.12.3 ADC Accuracy
Conditions: VDD=5V
1)
Notes:
1. ADC Accuracy vs. Negative Injection Current: Injecting negative current may reduce the accuracy of the conversion
being performed on another analog input. The effect of negative injection current on robust pins is specified in Section
12.12.
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 to guarantee 99.73% within ± max value from -40°C
to 125°C ( ± 3
σ distribution limits).
Figure 82. ADC Accuracy Characteristics
Symbol
Parameter
Conditions
Typ
Max2)
Unit
|ET|
Total unadjusted error 1)
46
LSB
|EO|
Offset error 1)
35
|EG|
Gain Error 1)
0.5
4.5
|ED|
Differential linearity error 1)
CPU in run mode @ fADC = 2 MHz.
1.5
4.5
|EL|
Integral linearity error 1)
CPU in run mode @ fADC = 2 MHz.
1.5
4.5
EO
EG
1LSBIDEAL
1LSB
IDEAL
V
AREF
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
1
2345
67
1021 1022 1023 1024
(1)
(2)
ET
ED
EL
(3)
VAREF
VSSA
1



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