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STM32L471RG Datasheet(PDF) 147 Page - STMicroelectronics

Part # STM32L471RG
Description  Batch acquisition mode
PDF  218 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L471RG Datasheet(HTML) 147 Page - STMicroelectronics

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STM32L471xx
Electrical characteristics
199
Equation 1: RAIN max formula
The formula above (Equation 1) is used to determine the maximum external impedance
allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).
RAIN
TS
fADC CADC
2
N2
+
()
ln
×
×
----------------------------------------------------------------
RADC
–
<
Table 64. Maximum ADC RAIN(1)(2)
Resolution
Sampling cycle
@80 MHz
Sampling time [ns]
@80 MHz
RAIN max (Ω)
Fast channels(3)
Slow channels(4)
12 bits
2.5
31.25
100
N/A
6.5
81.25
330
100
12.5
156.25
680
470
24.5
306.25
1500
1200
47.5
593.75
2200
1800
92.5
1156.25
4700
3900
247.5
3093.75
12000
10000
640.5
8006.75
39000
33000
10 bits
2.5
31.25
120
N/A
6.5
81.25
390
180
12.5
156.25
820
560
24.5
306.25
1500
1200
47.5
593.75
2200
1800
92.5
1156.25
5600
4700
247.5
3093.75
12000
10000
640.5
8006.75
47000
39000
8 bits
2.5
31.25
180
N/A
6.5
81.25
470
270
12.5
156.25
1000
680
24.5
306.25
1800
1500
47.5
593.75
2700
2200
92.5
1156.25
6800
5600
247.5
3093.75
15000
12000
640.5
8006.75
50000
50000



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