ST10F272B_12 STMICROELECTRONICS [STMicroelectronics], ST10F272B_12 Datasheet - Page 150

• Manufacturer Part Number: ST10F272B_12
• Description: 16-bit MCU with 256 Kbyte Flash memory and 12/20 Kbyte RAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Electrical characteristics
150/188
Equation 14
5.
Equation 15
So the error due to the voltage partitioning between the real resistive path and C
then half a count (considering the worst case when V
Equation 16
The other conditions to be verified is the time constants of the transients are really and
significantly shorter than the sampling period duration T
Equation 17
For complete set of parameters characterizing the ST10F272 A/D Converter equivalent
circuit, refer to
Now the three element of the external circuit R
conditions discussed in the previous paragraphs have been used to size the
component, the other must now be verified. The relation which allow to minimize the
accuracy error introduced by the switched capacitance equivalent resistance is in this
case:
Section 24.7: A/D converter
V A
10 τ 2
⋅
⋅
R S R F R L R SW R AD
-------------------------------------------------------------------------- -
τ 1
=
=
+
10 R ⋅ L
Doc ID 11917 Rev 3
(
R SW
R L
+
=
R EQ
⋅
(
R EQ
C S
V AM
------------ - R F R S
+
I INJ
+
R AD
+
=
C P1
–
-------------- -
f C C S
characteristics.
)
1
⋅
+
C S
+
–
=
C P2
=
10MΩ
2.8ns
F
=
=
, C
)
A
=
2.35mV
2.9kΩ
= 5V):
F
290ns
S
and R
:
<< T
<
S
L
1
-- - LSB
2
< T
= 1μs
are defined. Some
ST10F272B/ST10F272E
S
= 1μs
S
is less