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AN2556 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN2556
Description  Porting an application from the ST10F269Zx to the ST10F273Z4
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2556 Datasheet(HTML) 11 Page - STMicroelectronics

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AN2556
Modified features
11/35
In the default configuration, the sample time of the ST10F273Z4 is 2.5 times longer
compared to the ST10F269Zx. This has an impact on the frequency of the input signal that
can be applied to the ST10F273Z4.
1.4.2
Hardware impacts: electrical characteristics
Table 6: ADC differences lists the differences in the DC characteristics of the two devices.
10
10
TCL * 768
TCL * 800
1.04
10
10
11
TCL * 1536
TCL * 1600
1.04
10
Table 5.
ST10F273Z4 vs. ST10F269Zx sample time comparison table (continued)
ADCTC
ADSTC
ST10F269Zx
sample time
ST10F273Z4
sample time
Ratio
F273Z4_time /
F269_time
ADCTC
Table 6.
ADC differences
Parameter
Symbol
Limit values for
ST10F269Zx
Limit values for
ST10F273Z4
Unit
Min
Max
Min
Max
Analog reference voltage
VAREF
(1)
4.0
VDD + 0.1
4.5
VDD
V
Analog input voltage
VAIN
VAGND
VAREF
VAGND
VAREF
V
ADC input capacitance
CAIN
CP1 + CP2 +CS
pF
Port5, not sampling
-
10
-
7
Port5, sampling
-
15
-
10.5
Port1, not sampling
-
N.A.
-
9
Port1, sampling
-
N.A.
-
12.5
Sample time
tS
48TCL
1536TCL
1µs
120TCL
1600TCL
Conversion time
tC
388TCL
2884TCL
388TCL
2884TCL
Total unadjusted error
TUE
LSB
Port5
-2.0
+2.0
-2.0
+2.0
Port1 - no overload
-
-
-5.0
+5.0
Port1 - overload
-
-
-7.0
+7.0
Internal resistance of
analog source
RASRC
tS[ns]/150 - 0.25
k
Ω
Analog switch resistance
RSW
N.A.
N.A.
Ω
Port5
-
600
Port1
-
1000
RAD
-1300



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