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AN2021 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza AN2021
Descripción Electrónicos  The ST10F272B and ST10F272E are members of the STMicroelectronics
PDF  39 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2021 Datasheet(HTML) 13 Page - STMicroelectronics

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AN2021
Modified features
13/39
In the default configuration the sample time of the ST10F272 is 2.5 times longer compared
to that of the ST10F269. This has an impact on the frequency of the input signal that can be
applied to the ST10F272.
1.4.2
Hardware impact: electrical characteristics
Table 6 lists the differences in the DC characteristics of the two devices.
Table 5.
ST10F272 vs ST10F269 sample time comparison table
ADCTC
ADSTC
ST10F269
Sample time
ST10F272
Sample time
Ratio
F272E_time / F269_time
00
00
TCL * 48
TCL * 120
2.5
00
01
TCL * 96
TCL * 140
1.46
00
10
TCL * 192
TCL * 200
1.04
00
11
TCL * 384
TCL * 400
1.04
11
00
TCL * 96
TCL * 240
2.5
11
01
TCL * 192
TCL * 280
1.46
11
10
TCL * 384
TCL * 400
1.04
11
11
TCL * 768
TCL * 800
1.04
10
00
TCL * 192
TCL * 480
2.08
10
01
TCL * 384
TCL * 560
1.46
10
10
TCL * 768
TCL * 800
1.04
10
11
TCL * 1536
TCL * 1600
1.04
Table 6.
ADC differences
Symbol
Parameter
Limit values for ST10F269
Limit values for ST10F272
Unit
Min
Max
Min
Max
VAREF
Analog reference
voltage
4.0
VDD + 0.1
4.5
VDD
V
VAIN
Analog input voltage
VAGND
VAREF
VAGND
VAREF
V
CAIN
ADC input capacitance
(Port 5)
Not sampling
Sampling
-
-
10
15
-
-
CP1 + CP2 +CS
7
10.5
pF
tS
Sample time
48TCL
1536TCL
1µs
120TCL
1600TCL
tC
Conversion time
388TCL
2884TCL
388TCL
2884TCL
TUE
Total Unadjusted Error
(Port5)
-2.0
+2.0
-2.0
+2.0
LSB
RASRC
Internal resistance of
analog source
tS[ns]/150 -0.25
k
Ω



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