参数资料
型号: ST72F324LJ2T5
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, TQFP-44
文件页数: 38/154页
文件大小: 3519K
代理商: ST72F324LJ2T5
ST72324Lxx
132/154
12.12 10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD, fCPU, and TA unless otherwise specified.
Figure 78. RAIN max. vs fADC with CAIN=0pF
3)
Figure 79. Recommended CAIN & RAIN values.
4)
Notes:
1. When VAREF and VSSA pins are not available on the pinout, the ADC refers to VDD and VSS.
2. 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.
3. CPARASITIC represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the pad ca-
pacitance (3pF). A high CPARASITIC value will downgrade conversion accuracy. To remedy this, fADC should be reduced.
4. This graph shows that depending on the input signal variation (fAIN), CAIN can be increased for stabilization time and
decreased to allow the use of a larger serial resistor (RAIN).
5.The analog inputs of ROM devices are designed to be negative current tolerant. On Flash devices, injecting negative
current on any of the analog input pins significantly reduces the accuracy of any conversion being performed on any an-
alog 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 12.8 does not affect the ADC
accuracy.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fADC
ADC clock frequency
0.4
1
MHz
VAREF
Analog reference voltage 1)
VDD
V
VAIN
Conversion voltage range 2)
VSSA
VAREF
Ilkg
Positive input leakage current for analog
input
-40°C
≤TA≤85°C range
1
A
ROM devices: negative input leakage
current on analog pins 5)
VIN<VSS, | IIN |< 400A
on adjacent analog pin
5
6
A
RAIN
External input impedance
see
and
792)3)4)
k
CAIN
External capacitor on analog input
pF
fAIN
Variation freq. of analog input signal
Hz
CADC
Internal sample and hold capacitor
12
pF
tADC
Conversion time (Sample+Hold)
fCPU=4MHz, SPEED=0 fADC=1MHz
15
s
tADC
- No of sample capacitor loading cycles
- No. of Hold conversion cycles
4
11
1/fADC
0
5
10
15
20
25
30
35
40
45
010
30
70
CPARASITIC (pF)
Max
.R
AI
N
(
K
ohm)
1 MHz
0.1
1
10
100
1000
0.01
0.1
1
10
fAIN(KHz)
Max.
R
AI
N
(Kohm)
Cain 10 nF
Cain 22 nF
Cain 47 nF
1
相关PDF资料
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