st72324bk STMicroelectronics, st72324bk Datasheet - Page 142

• 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

Electrical characteristics
11.12
142/167
10-bit ADC characteristics
Subject to general operating conditions for V
Table 84.
1. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than
Figure 84. R
1. C
Symbol
V
C
R
C
f
V
t
t
f
AREF
ADC
ADC
ADC
I
10 k
the pad capacitance (3pF). A high C
f
AIN
ADC
AIN
lkg
ADC
AIN
AIN
PARASITIC
Ω
should be reduced.
). Data based on characterization results, not tested in production.
ADC clock frequency
Analog reference voltage
Conversion voltage range
Positive input leakage current
for analog input
Negative input leakage current
on robust analog pins
External input impedance
External capacitor on analog
input
Variation frequency of analog
input signal
Internal sample and hold
capacitor
Conversion time (Sample+Hold)
f
1, SPEED = 1 f
– No of sample capacitor
– No. of Hold conversion cycles
CPU
loading cycles
represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus
10-bit ADC characteristics
= 4 MHz, MAX_SPEED =
AIN
max. vs. f
Parameter
45
40
35
30
25
20
15
10
5
0
ADC
0
= 4 MHz
ADC
PARASITIC
with C
(1)
10
C
PARASITIC
f
0.7V
–40 °C ≤ T
+85 °C ≤ T
V
on adjacent robust
analog pin
AIN
CPU
value will downgrade conversion accuracy. To remedy this,
IN
<
= 0 pF
DD
≤ 4 MHz
DD
V
Conditions
SS,
(pF)
≤ V
, f
30
CPU
| I
A
A
AREF
(1)
IN
≤ +85 °C
≤ +125 °C
, and T
| < 400 µA
≤ V
2 MHz
1 MHz
DD
70
A
unless otherwise specified.
0.4
3.8
V
3.75
4
11
Min
SSA
ST72323 ST72323L
5
12
Typ
V
V
see
Figure
84
Figure
85
±250
Max
AREF
DD
±1
4
6
and
MHz
V
nA
µA
µA
kΩ
pF
Hz
pF
µs
1/f
Unit
ADC