参数资料
型号: ST72324K6B3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 51/157页
文件大小: 1037K
代理商: ST72324K6B3/XXX
ST72324J/K
144/157
10-BIT ADC CHARACTERISTICS (Cont’d)
12.12.1 ADC Accuracy
Conditions: VDD=5V
Notes:
1. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the analog input pins significantly
reduces the accuracy of the conversion being performed on another analog input.
For IINJ-=0.8mA, the typical leakage induced inside the die is 1.6A and the effect on the ADC accuracy is a loss of 4 LSB
for each 10K
increase of the external analog source impedance. It is recommended to add a Schottky diode (pin to
ground) to analog pins which may potentially inject negative current. Any positive injection current within the limits spec-
ified for IINJ(PIN) and ΣIINJ(PIN) in Section 12.8 does not affect the ADC accuracy.
2. Data based on characterization results over the whole temperature range, monitored in production.
3. Data based on characterization results in over the whole temperature range with optimized PCB layout, and MCU in
WFI with timer loop.
Figure 97. ADC Accuracy Characteristics
Symbol
Parameter
Conditions
Typ
Max
Unit
|ET|
Total unadjusted error 1)
3.5
EO
Offset error 1)
3
3.52)
LSB
EG
Gain Error 1)
0.5
22)
|ED|
Differential linearity error 1)
CPU in run mode @ fADC 2 MHz.
1.5
4.52)
CPU in test mode @ fADC 2MHz.
1
1.93)
|EL|
Integral linearity error 1)
CPU in run mode @ fADC 2MHz.
1.5
4.52)
CPU in test mode @ fADC 2MHz.
1.3
3.03)
EO
EG
1 LSBIDEAL
1LSB
IDEAL
V
AR EF
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.
Digi tal Result ADCDR
1023
1022
1021
5
4
3
2
1
0
7
6
1
2
3
4
5
6
7
1021 1022 1023 1024
(1)
(2)
ET
ED
EL
(3)
VAREF
VSSA
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