ST7263-EMU2 STMicroelectronics, ST7263-EMU2 Datasheet - Page 102

• Manufacturer Part Number: ST7263-EMU2
• Description: MCU, MPU & DSP Development Tools ST7 Emulator Board
• Manufacturer: STMicroelectronics

Specifications of ST7263-EMU2

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ST7263
7.9 8-BIT ADC CHARACTERISTICS
*Note: ADC Accuracy vs. Negative Injection Current :
For I
by 10K
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
102/109
ADC Analog to Digital Converter (8-bit)
Symbol
|TUE|
OE
GE
|DLE|
|ILE|
V
I
t
t
t
R
R
C
255
254
253
ADC
STAB
LOAD
CONV
AIN
AIN
ADC
SAMPLE
7
6
5
4
3
2
1
inj-
0
V
Digital Result ADCDR
S SA
=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
DD
increase of the external analog source impedance.
1
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
Sample capacitor loading time
Hold conversion time
External input resistor
Internal input resistor
Sample capacitor
supply, and worse temperature case.
O E
1LSB
2
i deal
3
TU E
=
Parameter
V
---------------------------------------- -
4
DDA
256
5
1 LS B(ideal)
–
V
SSA
6
ILE
7
(2)
D LE
f
V
f
V
ADC
ADC
DD
DD
253 254 255 256
(3)
=V
=V
=f
=f
CPU
CPU
DDA
DDA
Conditions
(1)
=4MHz
=4MHz
=5V
=5V
G E
V
DDA
(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.
V
in
(LSB
V
Min
SSA
-1
-2
ideal
)
Typ
32
32
1
8
8
Max
V
DDA
30
20
18
22
2
1
2
1
2
1/f
1/f
Unit
LSB
mA
pF
µs
µs
µs
V
ADC
ADC