参数资料
型号: ST72F321J7T3
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, PQFP44
封装: 10 X 10 MM, PLASTIC, TQFP-44
文件页数: 72/176页
文件大小: 1112K
代理商: ST72F321J7T3
ST72321J
163/176
12.12 10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD,fCPU, and TA unless otherwise specified.
Figure 96. Typical ADC Application
Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD-VSS=5V. They are given only as design guide-
lines and are not tested.
2. Data based on design simulation, not tested in production.
3. When VAREF and VSSA pins are not available on the pinout, the ADC refer to VDD and VSS.
4. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10k
). Data
based on characterization results, not tested in production.
5. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then
always valid.
Symbol
Parameter
Condition s
Min
Typ 1)
Max
Unit
fADC
ADC clock frequency
4
MHz
VAREF
Analog reference voltage 2)
0.7*VDD
5.5
V
VAIN
Conversion voltage range 3)
VSSA
VAREF
IL
Input leakage current
for analog input
-40
°C≤T
A≤85°C range
±250
nA
Other TA ranges
±1
A
RAIN
External input resistor
10 3)
k
CADC
Internal sample and hold capacitor
12
pF
tSTAB
Stabilization time after ADC enable
fCPU=8MHz,
fADC=4MHz
0 5)
s
tADC
Conversion time (Sample+Hold)
7.25
- No of sample capacitor loading cycles
- No. of Hold conversion cycles
4
11
1/fADC
AINx
ST72XXX
CIO
~2pF
VDD
IL
VT
0.6V
VT
0.6V
VAIN
RAIN
VAREF
VSSA
0.1
F
VDD
ADC
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