Electrical characteristics
STM32L100RC
90/104
DocID024995 Rev 4
Figure 25. Maximum dynamic current consumption on V
REF+
supply pin during ADC
conversion
General PCB design guidelines
Power supply decoupling should be performed as shown in
. The applicable
procedure depends on whether V
REF+
is connected to V
DDA
or not. The 100 nF capacitors
should be ceramic (good quality). They should be placed as close as possible to the chip.
ADC clock
Sampling (n cycles)
Conversion (12 cycles
)
I
ref+
300µA
700µA
MS36686V1
Table 56. Maximum source impedance R
AIN
max
(1)
Ts
(µs)
R
AIN
max (k
Ω
)
Ts (cycles)
f
ADC
= 16 MHz
(2)
Multiplexed channels
Direct channels
2.4 V < V
DDA
< 3.6 V 1.8 V < V
DDA
< 2.4 V 2.4 V < V
DDA
< 3.6 V 1.8 V < V
DDA
< 2.4 V
0.25
Not allowed
Not allowed
0.7
Not allowed
4
0.5625
0.8
Not allowed
2.0
1.0
9
1
2.0
0.8
4.0
3.0
16
1.5
3.0
1.8
6.0
4.5
24
3
6.8
4.0
15.0
10.0
48
6
15.0
10.0
30.0
20.0
96
12
32.0
25.0
50.0
40.0
192
24
50.0
50.0
50.0
50.0
384
1.
Guaranteed by design, not tested in production.
2.
Number of samples calculated for f
ADC
= 16 MHz. For f
ADC
= 8 and 4 MHz the number of sampling cycles can be reduced
with respect to the minimum sampling time Ts (µs),
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http://www.vicor.top/
021-31660491