st72324bk STMicroelectronics, st72324bk Datasheet - Page 145

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

ST72323 ST72323L
11.12.3
ADC accuracy
Table 85.
1. Design target values.
Figure 88. ADC accuracy characteristics
1.
Symbol
1023
1022
1021
|E
|E
|E
|E
|E
E
curves.
E
E
E
E
correlation line.
7
6
5
4
3
2
1
0
V
T
O
G
D
L
O
G
D
T
L
SSA
|
|
|
= integral linearity error: maximum deviation between any actual transition and the end point
|
|
= total unadjusted error: maximum deviation between the actual and the ideal transfer
= differential linearity error: maximum deviation between actual steps and the ideal one.
= offset error: deviation between the first actual transition and the first ideal one.
= gain error: deviation between the last ideal transition and the last actual one.
Digital result ADCDR
1LSB
1
E
Total unadjusted error
Offset error
Gain Error
Differential linearity error
(1)
Integral linearity error
O
IDEAL
2
ADC accuracy characteristics
3
=
Parameter
V
--------------------------------------------
AREF
(1)
4
(1)
1024
5
1 LSB
–
V
SSA
E
6
T
IDEAL
(1)
(1)
E
7
L
(2)
CPU in run mode @
f
CPU in run mode @
f
ADC
ADC
E
D
1021102210231024
(3)
4 MHz.
4 MHz.
Conditions
(1)
(1)
E
G
V
AREF
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
V
Typ
in
0.5
1.5
1.5
V
3
2
(LSB
DD
= 3 V
Electrical characteristics
IDEAL
Max
4
3
3
3
3
)
Typ
0.5
V
3
2
1
1
DD
= 5 V
Max
4
3
3
2
2
145/167
Unit
LSB