参数资料
型号: ST72621K4B1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, LEAD FREE, SHRINK, PLASTIC, DIP-32
文件页数: 27/139页
文件大小: 1264K
代理商: ST72621K4B1
122/139
Doc ID 6996 Rev 5
ADC CHARACTERISTICS (Cont’d)
12.12.1 ADC Accuracy
Table 27. fCPU=8 MHz, fADC=4 MHz RAIN< 10kΩ
2)
Notes:
1. Not tested in production, guaranteed by characterization. All accuracy measurements are taken with the MCU in WAIT
mode (no I/O switching) and when adequate low-pass filtering is present (0.1 F capacitor between VDD/VDDA and VSS/
VSSA). Outside these conditions, a degree of microcontroller noise may result, causing accuracy errors which will vary
based on board layout and the type of CPU activity.
2. ADC Accuracy vs. Negative Injection Current:
Injecting negative current on any of the analog input pins significantly reduces the accuracy of the conversion being per-
formed 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
Ω 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.
Symbol
Parameter
Conditions
Typ
Max
1)
Unit
|ET|
Total unadjusted error
VDD= 4V-5.5V
3
LSB
|EO|
Offset error
12
|EG|
Gain Error
0.7
2
|ED|
Differential linearity error
1.3
2
|EL|
Integral linearity error
2.9
5
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