ST10F276Z5 STMicroelectronics, ST10F276Z5 Datasheet - Page 194
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ST10F276Z5
Manufacturer Part Number
ST10F276Z5
Description
16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
Manufacturer
STMicroelectronics
Datasheet
1.ST10F276Z5.pdf
(239 pages)
Specifications of ST10F276Z5
Single Voltage Supply
5V ±10% (embedded regulator for 1.8 V core supply)
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Electrical characteristics
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selected (fastest conversion rate at a specific channel): In conclusion, it is evident that the
time constant of the filter R
charge level on C
the sampling switch is closed.
Figure 49. Anti-aliasing filter and conversion rate
The considerations above lead to impose new constraints to the external circuit, to reduce
the accuracy error due to the voltage drop on C
above, it is simple to derive the following relation between the ideal and real sampled volt-
age on C
From this formula, in the worst case (when V
ing to accept a maximum error of half a count (~2.44mV), it is immediately evident that a
constraint is on C
The next section provides an example of how to design the external network, based on
some reasonable values for the internal parameters and on a hypothesis on the characteris-
tics of the analog signal to be sampled.
Anti-aliasing filter (f
Analog source bandwidth (V
S
:
f
f
0
F
F
S
F
= RC Filter pole)
value:
cannot be modified by the analog signal source during the time in which
Noise
f
f
A
F
)
C
F
-----------
V A2
is definitely much higher than the sampling time T
V A
=
Sampled signal spectrum (f
------------------------------------------------------------
C P1
TC ≤ 2 RFCF (Conversion rate vs. filter pole)
f
2 f0 ≤ fC (Nyquist)
C F 2048 C S
F
= f
C P1
0
>
+
(Anti-aliasing Filtering Condition)
A
C P2
+
f
is maximum, that is for instance 5 V), assum-
0
C P2
S
; from the two charge balance equations
+
⋅
C F
+
C F
+
C S
C
= conversion Rate)
f
C
f
ST10F276Z5
S
, so the
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