ST STM32F103x6 Manual page 43

STM32F103xx
Table 39.
Symbol
R
AIN
C
AIN
I
lkg
R
ADC
C
ADC
t
CAL
t
lat
t
S
t
STAB
t
CONV
1. TBD = to be determined.
2. Depending on the input signal variation (f
allow the use of a larger serial resistor (R
3. During the sample time the input capacitance C
source. The internal resistance of the analog source must allow the capacitance to reach its final voltage
level within t
the conversion result. Values for the sample clock t
Table 40.
Symbol
|E |
T
|E |
O
|E |
G
|E |
D
|E |
L
1. TBD = to be determined.
2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-
robust) analog input pins should be avoided as this significantly reduces the accuracy of the conversion
being performed on another analog input. It is recommended to add a Schottky diode (pin to ground) to
standard analog pins which may potentially inject negative current.
Any positive injection current within the limits specified for I
affect the ADC accuracy.
ADC characteristics
Parameter
External input impedance
External capacitor on analog
input
Negative input leakage current
on analog pins
Sampling switch resistance
Internal sample and hold
capacitor
Calibration time
Injection conversion latency
Sampling time
Power-up time
Total conversion time (including
sampling time)
After the end of the sample time t
S.
ADC accuracy (f
PCLK2
(1)
3.3 V)
Parameter
(2)
Total unadjusted error
(2)
Offset error
(2)
Gain Error
Differential linearity error
(2)
Integral linearity error
(1)
(continued)
Conditions
<
V V | I | < 400 µA
IN SS, IN
on adjacent analog pin
f = 14MHz
ADC
f = 14 MHz
ADC
f = 14 MHz
ADC
f = 14 MHz
ADC
), C can be increased for stabilization time and reduced to
AIN AIN
). It is valid for all f
AIN ADC
(5 max) can be charged/discharged by the external
AIN
, changes of the analog input voltage have no effect on
S
depend on programming.
S
= 14 MHz, f = 14 MHz, R
ADC
Conditions
(2)
INJ(PIN)
Electrical characteristics
Min Typ
(2)(3)
TBD
5
5.9
83
0.214
3
0.107 17.1
0 0 1
1 18
14 (1.5 for sampling
+12.5 for successive
approximation)
frequencies ≤ 14 MHz.
<10 kΩ , V
AIN
Typ Max
3 TBD
1 TBD
2 TBD
3 TBD
2 TBD
and ΣI
in Section 5.3.12
INJ(PIN)
Max Unit
kΩ
pF
µA
6
1 kΩ
5 pF
µs
1/f
ADC
µs
1/f
ADC
µs
µs
µs
1/f
ADC
=
DDA
Unit
LSB
does not
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