參數(shù)資料
型號(hào): ST72T631K2M0
廠商: 意法半導(dǎo)體
英文描述: LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C
中文描述: 低速USB 8高達(dá)16K的內(nèi)存位微控制器系列,高達(dá)512字節(jié)RAM,8位ADC,水分散粒劑,定時(shí)器,SCI
文件頁數(shù): 102/109頁
文件大小: 857K
代理商: ST72T631K2M0
ST7263
102/109
7.9 8-BIT ADC CHARACTERISTICS
*
Note
: ADC Accuracy vs. Negative Injection Current
For I
=0.8mA, the typical leakage induced inside the die is 1.6μA and the effect on the ADC accuracy is a loss of 1 LSB
by 10K
increase of the external analog source impedance.
These measurements results and recommandations are done in the worst condition of injection:
- negative injection
- injection to an Input with analog capability ,adjacent to the enabled Analog Input
- at 5V V
DD
supply, and worse temperature case.
OE
GE
1LSB(ideal)
1LSBideal
------------------------VSSA
256
=
V
in
(LSB
ideal
)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
TUE
=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
OE
=Offset Error: deviation between the first actual
transition and the first ideal one.
GE
=Gain Error: deviation between the last ideal
transition and the last actual one.
DLE
=Differential Linearity Error: maximum devia-
tion between actual steps and the ideal one.
ILE
=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
Digital Result ADCDR
255
254
253
5
4
3
2
1
0
V
SSA
7
6
1
2
3
4
5
6
7
253 254 255 256
(1)
(2)
TUE
DLE
ILE
(3)
V
DDA
ADC Analog to Digital Converter (8-bit)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
|TUE|
OE
GE
|DLE|
|ILE|
V
AIN
I
ADC
t
STAB
Total unadjusted error*
Offset error*
Gain Error*
Differential linearity error*
Integral linearity error*
Conversion range voltage
A/D conversion supply current
Stabilization time after enable ADC
f
ADC
=f
CPU
=4MHz
V
DD
=V
DDA
=5V
2
1
2
1
2
LSB
-1
-2
V
SSA
V
DDA
V
f
ADC
=f
CPU
=4MHz
V
DD
=V
DDA
=5V
1
mA
μs
μs
1/f
ADC
μs
1/f
ADC
Κ
Κ
pF
30
t
LOAD
Sample capacitor loading time
8
32
8
32
t
CONV
Hold conversion time
R
AIN
R
ADC
C
SAMPLE
Sample capacitor
External input resistor
Internal input resistor
20
18
22
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