參數(shù)資料
型號(hào)： ST7FLIT19BF1U6TR
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, QCC20
封裝： LEAD FREE, QFN-20
文件頁數(shù)： 43/153頁
文件大?。?/td> 2862K
代理商： ST7FLIT19BF1U6TR
ST7LITE1xB
137/153
ADC CHARACTERISTICS (Cont’d)
ADC Accuracy with VDD=5.0V
Notes:
1. Data based on characterization results. Not tested in production.
2. 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 13.8 does not affect the
ADC accuracy.
3. Data based on characterization results over the whole temperature range, monitored in production.
Figure 110. ADC Accuracy Characteristics with amplifier disabled
Symbol
Parameter
Conditions
Typ
Max
Unit
ET
Total unadjusted error
fCPU=8MHz, fADC=4MHz
46 1)
LSB
EO
Offset error
35 1)
EG
Gain Error
0.5
4 1)
ED
Differential linearity error 3)
1.5
3 2)
EL
Integral linearity error 3)
1.5
3 2)
EO
EG
1LSBIDEAL
1LSB
IDEAL
V
DD
V
SS
–
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
2
3
4567
1021 1022 1023 1024
(1)
(2)
ET
ED
EL
(3)
VDD
VSS
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